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Panasonic KX-FT21BX, Service Manual

The Panasonic KX-FT21BX is a dependable communication device designed for home and office use. Need assistance in setting it up? Look no further! Simply download the free service manual from manualshive.com and gain access to comprehensive instructions, troubleshooting tips, and valuable insights to optimize your user experience.

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KX-FT21LA

This replacement parts list is for the KX-FT21LA only.  

Ref . No.

Part No.

 Part Name & Description & Value

Pcs

Ref . No.

Part No.

Value

Pcs

(CONNECTORS)                     

R40   

ERJ3GEY J473       

47K                           

  

1

R42   

ERJ3GEY J433       

43K                           

  

1

CN1   

PQJP8G30Y          

CONNECTOR, 8PIN                    

  

1

R43   

ERJ3GEY J224       

220K                          

  

1

CN2   

PQJP16A19Z        

CONNECTOR, 16PIN                        

1

R44   

ERJ3GEY J395       

3.9M                          

  

1

CN3   

PQJP5G30Y          

CONNECTOR, 5PIN                     

  

1

R46   

ERJ3GEY J123       

12K                           

  

1

CN4   

PQJP11G100Z       

CONNECTOR, 11PIN                      S

1

R49   

ERJ3GEY J683       

68K                           

  

1

CN5   

PQJP2G30Y          

CONNECTOR, 2PIN                     

  

1

CN6   

PFJS06A13Z        

CONNECTOR, 6PIN                     

  

1

R51   

ERJ3GEY J153       

15K                           

  

1

CN7   

PFJS11A13Z        

CONNECTOR, 11PIN                        

1

R52   

ERJ3GEY J224       

220K                          

  

1

CN8   

PFJS10A13Z        

CONNECTOR, 11PIN                        

1

R53   

ERJ3GEY J104       

100K                          

  

1

R54   

ERJ3GEY J105       

1M                            

  

1

R56   

ERJ3GEY J123       

12K                           

  

1

(OTHERS)                

R57   

ERJ3GEY J224       

220K                          

  

1

R58   

ERJ3GEY J472       

4.7K                          

  

1

F1    

PFRB002122KZ      

FUSE                          

  

1

R59   

ERJ3GEY J334       

330K                          

  

1

X3    

PFVBKB240ZAT      

CERAMIC FILTER                

  

1

R60   

ERJ3GEY J562       

5.6K                          

  

1

R62   

ERJ3GEY J393       

39K                           

  

1

(RESISTORS)

R63   

ERJ3GEY J821       

820

  

1

R64   

ERDS1TJ222        

2.2K                          

S

1

D4    

ERJ8GEY 0R00       

0

  

1

R66   

ERJ3GEY J563       

56K                           

  

1

R67   

ERJ3GEY 0R00       

0

  

1

J2    

ERJ3GEY 0R00       

0

  

1

R68   

ERJ3GEY 0R00       

0

  

1

J4    

ERJ3GEY 0R00       

0

  

1

R69   

ERJ3GEY J101       

100

  

1

J6-7  

ERJ6GEY 0R00V    

0

  

2

R70   

ERJ3GEY J101       

100

  

1

J8-9    

ERJ8GEY 0R00       

0

  

2

R71   

ERJ3GEY J101       

100

  

1

R72   

ERJ3GEY J153       

15K                           

  

1

L3-4

ERJ3GEY 0R00       

0

  

2

R73   

ERJ3GEY J203       

20K                           

  

1

L5-7    

ERJ3GEY J101       

0

  

3

R74   

ERJ3GEY J562       

5.6K                          

  

1

L8-9    

ERJ3GEY 0R00       

0

  

1

R75   

ERJ3GEY J472       

4.7K                          

  

1

R77   

ERJ3GEY J472       

4.7K                          

  

1

L10-15,  

ERJ3GEY 0R00       

0

  

7

R78   

ERJ3GEY J102       

1K                            

  

1

L17   

  

R79   

ERJ3GEY 0R00       

0

  

1

R1    

ERJ3GEY J473       

47K                           

  

1

R80   

ERJ3GEY J151       

150

  

1

R2    

ERJ3GEY 0R00       

0

  

1

R81   

ERJ3GEY J470       

47

  

1

R6    

ERJ3GEY 0R00       

0

  

1

R82   

ERJ3GEY J6R8       

6.8

  

1

R7    

ERJ3GEY J103       

10K                           

  

1

R87   

ERJ3GEY J224       

220K                          

  

1

R8    

ERJ3GEY J472       

4.7K                          

  

1

R88   

ERJ3GEY J224       

220K                          

  

1

R9    

ERJ3GEY J472       

4.7K                          

  

1

R89   

ERJ3GEY J103       

10K                           

  

1

R10   

ERJ3GEY J151       

150

  

1

R90   

ERJ3GEY J224       

220K                          

  

1

R11   

ERJ3GEY J151       

150

  

1

R91   

ERJ3GEY J224       

220K                          

  

1

R12   

ERJ3GEY J151       

150

  

1

R92   

ERJ3GEY J222       

2.2K                          

  

1

R13   

ERJ3GEY J102       

1K                            

  

1

R93   

ERJ3GEY J473       

47K                           

  

1

R14   

ERJ3GEY J222       

2.2K                          

  

1

R98   

ERJ3GEY J102       

1K                            

  

1

R17   

ERJ3GEY J123       

12K                           

  

1

R18   

ERJ3GEY J222       

2.2K                          

  

1

R102  

ERJ3GEY J821       

820

  

1

R19   

ERJ3GEY J122       

1.2K                          

  

1

R103  

ERJ3GEY J821       

820

  

1

R104  

ERJ3GEY J821       

820

  

1

R20   

ERJ3GEY J821       

820

  

1

R105  

ERJ3GEY J102       

1K                            

  

1

R21   

ERJ3GEY J472       

4.7K                          

  

1

R106  

ERJ3GEY J102       

1K                            

  

1

R22   

ERJ3GEY J912       

9.1K                          

  

1

R107  

ERJ3GEY J102       

1K                            

  

1

R24   

ERJ3GEY J103       

10K                           

  

1

R108  

ERJ3GEY J102       

1K                            

  

1

R25   

ERJ3GEY J103       

10K                           

  

1

R109  

ERJ3GEY J102       

1K                            

  

1

R26   

ERJ3GEY J331       

330

  

1

R27   

ERJ3GEY J104       

100K                          

  

1

R110  

ERJ3GEY J102       

1K                            

  

1

R28   

ERJ3GEY J124       

120K                          

  

1

R29   

ERJ3GEY J105       

1M                            

  

1

R30   

ERJ3GEY 0R00       

0

  

1

(CAPACITORS)

R32   

ERJ3GEY J103       

10K                           

  

1

R33   

ERJ3GEY J102       

1K                            

  

1

C1    

ECUV1H104ZFV      

0.1

S

1

R34   

ERJ3GEY J105       

1M                            

  

1

C2    

ECUV1H104ZFV      

0.1

S

1

R35   

ERJ3GEY J563       

56K                           

  

1

C3    

ECUV1H104ZFV      

0.1

S

1

R36   

ERJ3GEY J103       

10K                           

  

1

C4    

ECUV1C104KBV      

0.1

  

1

R37   

ERJ3GEY J243       

24K                           

  

1

C6    

ECUV1H104ZFV      

0.1

S

1

R38   

ERJ3GEY J243       

24K                           

  

1

C8    

ECUV1H104ZFV      

0.1

S

1

R39   

ERJ3GEY J753       

75K                           

  

1

Summary of Contents for KX-FT21BX

Page 1: ...f potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death Please file and use this manual together with the Service Manual for model KX FT21LA O...

Page 2: ...dified READ MR Modem Speed 9 600 7 200 4 800 2 400 bps Automatic Fallback Operating Environment 5 C 35 C 41 F 95 F 45 85 RH Relative Humidity Dimensions HxWxD 122x338x240 mm 4 13 16 x 13 5 16 9 7 16 Mass Weight Approx 2 5 kg 5 5 lb Power Consumption Standby Approx 5 5 W Transmission Approx 17 W Reception Approx 30 W When receiving the CCITT No 1 Test Chart Copy Approx 30 W When copying the CCITT N...

Page 3: ...l KX FT21BX KX FT21BX W KX FT21BX KX FT21BX W CONTROL PANEL Change from original page 13 Power cord To the single telephone line Connect to LINE To the power outlet 220V 240 V Telephone line cord Handset cord ...

Page 4: ...K 077 Auto answer mode 1 FAX ONLY 2 TEL FAX FAX ONLY OK 078 TEL FAX delay ring 1 to 4 rings 1 OK 080 Set default YES NO NO NG 501 Pause time 001 600 X 100 ms 030 OK 502 Flash time 01 90 X 10 ms 10 OK 503 Dial speed 1 10pps 2 20 pps 10 OK 520 CED frequency 1 2100Hz 2 1100Hz 2100 OK 521 International mode 1 ON 2 OFF ON OK 522 Auto standby 1 ON 2 OFF ON OK 523 RCV EQL 1 ON 2 OFF OFF OK 524 SND EQL 1 ...

Page 5: ...m sesitivity 20 48 45 OK 717 Transmit speed select 1 9600 2 7200 3 4800 4 2400bps 9600bps OK 718 Receive speed select 1 9600 2 7200 3 4800 4 2400bps 9600bps OK 719 Ringer off in TEL FAX mode 1 ON 2 OFF ON OK 721 Pause tone detect 1 ON 2 OFF ON OK 722 Redial tone detect 1 ON 2 OFF ON OK 763 Friendly reception CNG detection select 1 10S 2 20S 3 30S 20S OK 771 T1 timer 1 35 sec 2 60 sec 35 sec OK 774...

Page 6: ... 6 Model KX FT21BX KX FT21BX W KX FT21BX KX FT21BX W Set Value Code Set Value 4 3 USER MODE The list below is an example of the SYSTEM SETUP LIST the unit prints out Change from original page 82 Code ...

Page 7: ...elt again and you cannot pinpoint the faulty point In most cases the symptom is that nothing is output It is more likely that the fault is in the primary side rather than the secondary side Check the primary side first Input Circuit AC Input Surge Absorber Circuit G H 5V 24V Kick on Voltage Circuit E IC101 F GND Control Circuit R102 R103 Converter Circuit C D 5V Output Circuit 24V Output Circuit R...

Page 8: ...t and IC101 Replace D202 NO NO YES Are R107 R109 and D106 OK YES YES NO NO Are D G D S and S G Q101 short Replace Q101 and R105 Power ON Power OFF Power OFF Power ON Power OFF YES NO Control circuit check A A When testing for a short circuit turn off first and then turn on when you start to check output voltage 24V or 5V as illustrated in the flow chart An analog tester is recommended to use for c...

Page 9: ...circuit in terminal 4 If D101 D102 D103 and D104 are short circuited F101 will melt open In this case replace all of the parts D101 D102 D103 D104 F101 Q101 The worst case of Q101 is a short circuit between the Drain and Gate because damage expands to the peripheral circuit of Q101 This is due to a very high voltage through the Gate circuit which is composed of R107 R109 D106 and IC101 You should ...

Page 10: ...ncrease the level when the telephone line condition is poor 598 Modem sensitivity 20 48 45 See page 42 717 Transmit speed select 1 9600BPS 2 7200BPS 3 4800BPS 4 2400BPS 1 4 9600 BPS Adjusts the speed to start training during FAX transmission 718 Receive speed select 1 9600BPS 2 7200BPS 3 4800BPS 4 2400BPS 1 4 9600 BPS Adjusts the speed to start training during FAX reception 719 Ringer off in TEL F...

Page 11: ...y D101 D102 D103 and D104 and charges C106 to make DC voltage Then it supplies power to the converter circuit Kick on voltage circuit Bias is applied to the Q101 gate via this circuit when the AC power is turned on and Q101 begins operating Input Circuit AC Input Surge absorber circuit G H 5V 24V Kick on Voltage Circuit E IC101 F GND Control Circuit R102 R103 Converter Circuit C D 5V Output Circui...

Page 12: ...ulation When Q1 is ON the energy is charged in the transfer primary coil according to E1 When Q1 is OFF the energy is output from the secondary transfer as follows L D1 Load L Then the power is supplied to the Load When Q1 is ON power is not output from the secondary side The output voltage is fed back in the control IC according to the error amp rectifier Then depending on how TON is controlled s...

Page 13: ...hown as follows When the output voltage of the 24V circuit increases the current of the photo coupler PC101 increases the pulse width of the output control IC becomes narrower and the ON period of Q101 becomes shorter Over Current Limiter O C L The highest drain current Q101 is limited by a limiter circuit IC101 of 24V The 24V output is limited by this circuit Over Voltage Circuit If the 24V outpu...

Page 14: ... 14 Model KX FT21BX KX FT21BX W KX FT21BX KX FT21BX W MEMO ...

Page 15: ...N C104 2200p 2200p C105 2200p C106 C107 47p R106 R128 47 1 C201 470 35 C204 47 35 C203 1000 16 R121 10K R222 2 2K R221 2 2K R224 5K R225 IC201 3 3K VR201 27K R205 680 2 PC101 56 400 D101 TH101 D109 R105 0 22 2 R102 R123 R127 C124 1 8K 0 1 C121 R126 5 6K C122 0 22 16 C123 680p C109 47 35 4700p R103 82K 82K R122 R133 R132 150K 150K 150K 120K R109 D106 R107 68 10 R131 R130 R129 120K 200K 2 R104 200K ...

Page 16: ... G F E D C B A H COMPONENT VIEW PRINTED CIRCUIT BOARD ANALOG BOARD Change from original page 159 CAUTION FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE ONLY WITH SAME TYPE AND RATINGS OF FUSE F101 T3 15AH 250V L101 R101 C102 R109 R105 R108 T101 C206 VR201 PC101 D106 TH101 D107 D109 IC101 ZNR101 F101 C101 D104 D103 C103 C104 C106 R106 R104 R110 L103 Q101 C109 C108 C107 D108 D105 D202 R205 J6...

Page 17: ...1BX W KX FT21BX KX FT21BX W CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION Change from original page 167 1 OPERATION PANEL SECTION 2 7 1 18 19 25 3 8 9 27 10 13 16 16 22 21 23 15 11 12 28 14 4 5 PCB3 6 24 17 20 A A A A 26 CN3 ...

Page 18: ... 18 Model KX FT21BX KX FT21BX W KX FT21BX KX FT21BX W ACCESSORIES AND PACKING MATERIALS Change from original page 172 A6 A8 P2 A7 P3 A4 A1 P4 P5 P1 A5 A3 A2 ...

Page 19: ...QS Styrol ECQM ECQV ECQE ECQU ECQB Polyester 60 PFQT1503Z CAUTION LABEL 1 PQCBX ECUV Chip ECEA ECSZ ECOS Electrolytic 61 PFUS1172Z SPRING THERMAL HEAD 4 ECMS Mica ECQP Polypropylene 62 PFDE1102Z1 LEVER LOCK S 1 Voltage 63 PFJS02Q42Z CONNECTOR 2PIN 1 ECQ Type ECQG ECSZ Type Others 64 PFAS50P003Z SPEAKER 1 ECQV Type 65 PFUS1179Z SPRING LOCK LEVER 1 1H 50V 05 50V OF 3 15V OJ 6 3V 1V 35V 66 PFHE1019Z ...

Page 20: ... Q6 PQVTDTC114EU TRANSISTOR SI or UN5211T 1 A1 PFJXE0801Z HANDSET For KX FT21BX 1 Q7 2SB1322 TRANSISTOR SI S 1 A1 PFJXE0805Z HANDSET For KX FT21BX W 1 Q8 PQVTDTC114EU TRANSISTOR SI or UN5211T 1 A2 PFJA1029Y CURL CORD For KX FT21BX 1 A2 PFJA1029Z CURL CORD For KX FT21BX W 1 Q10 2SC4155R TRANSISTOR SI 1 A3 PQJA10075Z TEL CORD 1 Q11 2SC4155R TRANSISTOR SI 1 A4 PFUS1167Z STACKER 1 Q13 PFVTSI4431DY TRA...

Page 21: ...ERJ3GEYJ562 5 6K 1 L8 9 ERJ3GEY0R00 0 1 R75 ERJ3GEYJ472 4 7K 1 R77 ERJ3GEYJ472 4 7K 1 L10 15 ERJ3GEY0R00 0 7 R78 ERJ3GEYJ102 1K 1 L17 R79 ERJ3GEY0R00 0 1 R1 ERJ3GEYJ473 47K 1 R80 ERJ3GEYJ151 150 1 R2 ERJ3GEY0R00 0 1 R81 ERJ3GEYJ470 47 1 R6 ERJ3GEY0R00 0 1 R82 ERJ3GEYJ6R8 6 8 1 R7 ERJ3GEYJ103 10K 1 R87 ERJ3GEYJ224 220K 1 R8 ERJ3GEYJ472 4 7K 1 R88 ERJ3GEYJ224 220K 1 R9 ERJ3GEYJ472 4 7K 1 R89 ERJ3GEY...

Page 22: ...22P 1 C40 ECEA1HKS100 10 S 1 JACK C41 ECUV1H104ZFV 0 1 S 1 C42 ECUV1H102KBV 0 001 1 CN3 PQJJ1TB18Z JACK S 1 C43 ECUV1C104KBV 0 1 1 CN4 PQJJ1T004Z JACK S 1 C44 ECUV1H150JCV 15P 1 CN5 PQJJ1T004Z JACK S 1 C45 ECUV1C104KBV 0 1 1 C46 ECUV1H104ZFV 0 1 S 1 C47 ECUV1H220JCV 22P 1 C48 ECUV1C104KBV 0 1 1 CONNECTORS C49 ECUV1H220JCV 22P 1 CN1 PQJS16A10Z CONNECTOR 16PIN 1 C50 ECUV1H222KBV 0 0022 1 CN2 PQJP02G...

Page 23: ...0 01 1 R10 ERJ3GEYJ622 6 2K 1 C33 ECEA1CKS470 47 S 1 R11 ERJ3GEYJ563 56K 1 C34 ECUV1H103KBV 0 01 1 R12 ERJ3GEYJ123 12K 1 C35 ECQE2E105KZ 1 S 1 R13 ERJ3GEYJ563 56K 1 C36 ECUV1C273KBV 0 027 1 R14 ERDS2TJ471 470 1 R15 ERJ3GEYJ153 15K 1 R16 ERJ3GEYJ394 390K 1 OPERATION BOARD PARTS R18 ERJ3GEYJ103 10K 1 R19 ERJ3GEYJ224 220K 1 PCB3 PFLP1196BXZ OPERATION BOARD ASS Y RT 1 R21 ERJ3GEYJ223 22K 1 R23 ERJ3GEY...

Page 24: ...ORS SW1 EVQ11Y 05B SPECIAL SWITCH 1 CN31 PQJP2D98Z CONNECTOR 2PIN 1 SW2 EVQ11Y 05B SPECIAL SWITCH 1 CN301 PQJP8G30Z CONNECTOR 8PIN 1 SW3 EVQ11Y 05B SPECIAL SWITCH 1 SW5 EVQ11Y 05B SPECIAL SWITCH 1 COIL SW6 EVQ11Y 05B SPECIAL SWITCH 1 SW7 EVQ11Y 05B SPECIAL SWITCH 1 L101 PFLES11V0523 COIL 1 SW8 EVQ11Y 05B SPECIAL SWITCH 1 SW10 EVQ11Y 05B SPECIAL SWITCH 1 RESISTORS SW11 EVQ11Y 05B SPECIAL SWITCH 1 S...

Page 25: ...25 PQ4R10XJ332 3 3K S 1 KM79811245C0 BASIC FACSIMILE TECHNIQUE 1 PHOTO ELECTRIC TRANSDUCERS Notes PC101 0N3171 PHOTO ELECTRIC TRANSDUCER 1 Tools and Extension Cords are useful for servicing They make servicing easy CAPASITORS C101 ECQU2A224MG 0 22 1 C102 ECQU2A104MV 0 1 1 C103 ECKNTS222ME 0 0022 1 C104 ECKNTS222ME 0 0022 1 C105 ECKNTS222ME 0 0022 1 C106 PFCEA400SX56 56 S 1 C107 ECKD3A470KBP 47P 1 ...

Page 26: ... 26 Model KX FT21BX KX FT21BX W KX FT21BX KX FT21BX W YM Q KXFT21BX KXFT21BX W Printed in Japan ...

Page 27: ...ral public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or dea...

Page 28: ...t stacker 14 Document you can Send 16 Maintenance Items and Component Locations 17 20 TROUBLESHOOTING GUIDE Troubleshooting Summary 22 User Recoverable Errors 23 Document jam 24 Troubleshooting Details 25 82 Programming and Lists 83 87 Test Functions 88 89 Journal 3 90 91 ADJUSTMENTS Adjusting the Feeder Pressure 93 DISASSEMBLY INSTRUCTIONS Diassembly Instructions 95 105 How to Replace the Flat Pa...

Page 29: ...ARD DIGITAL BOARD 153 156 SCHEMATIC DIAGRAM DIGITAL CIRCUIT 157 SCHEMATIC DIAGRAM ANALOG CIRCUIT 158 PRINTED CIRCUIT BOARD ANALOG BOARD 159 160 PRINTED CIRCUIT BOARD SWITCHING POWER SUPPLY 161 SCHEMATIC DIAGRAM SWITCHING POWER SUPPLY 162 PRINTED CIRCUIT BOARD OPERATION BOARD 163 SCHEMATIC DIAGRAM OPERATION CIRCUIT 164 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 165 FIXTURES AND TOOLS 166 CAB...

Page 30: ...cians 5 Battery Caution 6 AC Caution 6 Personal Safety Precautions 7 Specifications 8 Optional Accessories 8 CCITT No 1 Test Chart 9 Location of Controls 10 11 Features 12 Connections 13 Installation 14 16 Document stacker 14 Documents you can send 16 Maintenance Items and Component Locations 17 20 ...

Page 31: ...is evident 4 After servicing be sure to restore the lead dress insulation barriers insulation papers shields etc 5 Before returning the serviced equipment to the customer be sure to perform the following insulation resistance test to prevent the customer from being exposed to shock hazards INSULATION RESISTANCE TEST 1 Unplug the power cord and short the two prongs of the plug with a jumper wire 2 ...

Page 32: ...placed Replace only with the same or equivalent type recommended by the manufacture Dispose of used batteries according to the manufacturer s instructions For safety before closing the lower cabinet please make sure of the following precautions 1 The earth lead is fixed with the screw 2 The AC connector is connected properly 3 Wrap the AC lead around the core 2 times AC CAUTION ...

Page 33: ...otates the two rollers Be careful not to touch them with your hands especially when the unit is operating 2 LIVE ELECTRICAL SECTIONS All the electrical sections of the unit supplied with AC power by the AC power cord are live Never disassemble the unit for service with the AC power supply plugged in AC voltage is supplied to the primary side of the power supply unit Therefore always unplug the AC ...

Page 34: ...orary tone dialing Electric telephone directory General Desktop type LCD Liquid Crystal Display readout Help function Copier function Facsimile Space Saving Compact Design Resolution standard fine super fine halftone Copier Function Automatic Document Feeder 10 Sheets Help Printout Easy to view LCD 15 Characters ...

Page 35: ...ffective Printing Width 208 mm 83 16 Transmission Time Approx 15 s page Original mode Approx 30 s page G3 Normal mode Scanning Density Horizontal 8 pels mm 203 pels inch Vertical 3 85 lines mm 98 lines inch STANDARD mode 7 7 lines mm 196 lines inch FINE HALF TONE mode 15 4 lines mm 392 lines inch SUPER FINE mode Halftone Level 64 level Scanner Type Contact Image Sensor CIS Printer Type Thermal Pri...

Page 36: ...KX FT21LA 10 CCITT NO 1 TEST CHART Actual size ...

Page 37: ...INTRODUCTION 11 KX FT21LA LOCATION OF CONTROLS 1 OVERVIEW Cover open button Document exit Document guide s Document entrance Document stacker ...

Page 38: ...ings during programming To search for a stored name To change the receive mode To dial without lifting the handset To stop an operation or cancel programming To initiate fax transmission reception or copying To store a setting during programming For the Speed Dial For the Telephone Directory with Alpha Search To select stations 4 6 for the One Touch Dial To keep the telephone number secret To inse...

Page 39: ...CONNECTIONS Power cord To the single telephone line Connect to LINE To the power outlet 120V Telephone line cord Handset cord Note When you operate this products the power outlet should be near the product and easily accessible ...

Page 40: ...r may occur For accessory order information When the power cord is connected everytime you close the cover a message will be printed If the recording paper is set to the wrong side the message will not be printed Install the paper correctly correct incorrect 4 Tear off the excess paper by pulling it towards you 3 Close the cover securely by pushing down on both ends 2 Pull the leading edge of the ...

Page 41: ...ill To enter the same number key continuously move the cursor to the next space Press START COPY SET SETUP ITEM NO PROG Press MENU To insert a character 1 Press or to move the cursor to the position to the right of where you want to insert the character 2 Press One Touch Dial key 2 to insert a space and enter the character To correct a mistake Press or to move the cursor to the incorrect character...

Page 42: ...TOP 2 Document weight Single sheet 45 g m2 to 90 g m2 12 lb to 24 lb Multiple sheets up to 10 sheets 60 g m2 to 75 g m2 16 lb to 20 lb Note Remove clips staples or other similar fastening objects Check that ink paste or correction fluid has dried Do not send the following types of documents Use copies for fax transmission Chemically treated paper such as carbon or carbonless duplicating paper Elec...

Page 43: ...om the transmitter receiver or the telephone line 4 Determine causes Determine the causes of equipment problem by troubleshooting 5 Equipment repairs Repair or replace the defective parts and take appropriate measures at this stage to ensure that the problem will not recur 6 Confirm normal operation of the equipment After completing the repairs conduct copying self testing and communication testin...

Page 44: ...ck if the screws are tight on all parts NO 1 2 3 4 5 6 OPERATION Document Path Rollers Thermal Head Glass Sensors Abnormal wear and tear or loose parts REMARKS See page 19 See pages 20 and 104 See page 19 See page 79 Item Separation Roller Ref No 89 Separation Rubber Ref No 85 Feed Rollers Ref No 65 Thermal Head Ref No 55 Cycle 3 months 3 months 3 months 3 months Procedure See p 19 See p 19 See p ...

Page 45: ...utton Clean the document feeder rollers sub roller and rubber flap with a cloth moistened with isopropyl rubbing alcohol and let all parts dry thoroughly Clean the white plate and glass with a soft dry cloth 5 Close the cover securely by pushing down on both ends 6 Connect the power cord and the telephone line cord Caution Do not use paper products such as paper towels or tissues to clean the insi...

Page 46: ... 2 3 4 Disconnect the power cord and the telephone line cord Open the cover by pressing the cover open button Clean the thermal head with a cloth moistened with isopropyl rubbing alcohol and let it dry thoroughly Close the cover securely by pushing down on both ends 5 Connect the power cord and the telephone line cord Caution To prevent a malfunction due to static electricity do not use a dry clot...

Page 47: ...tarting troubleshooting 25 3 3 Table of troubleshooting items 26 3 4 Simple check list 27 3 5 ADF section 28 36 3 6 Communication section 37 58 3 7 Digital board section 59 70 3 8 Analog board section 71 73 3 9 Power supply section 74 77 3 10 Operation board section 78 3 11 Sensor section 79 3 12 Read section 80 81 3 13 Thermal head section 82 4 Programming and Lists 83 87 5 Test Functions 88 89 6...

Page 48: ... Before troubleshooting first check that the connectors and cables are connected correctly not loose If the problem occurs randomly check it very carefully 3 When connecting the AC power cord with the unit case and checking the operation exercise utmost care when handling electric parts in order to avoid electric shock and short circuits 4 After troubleshooting double check that you have not forgo...

Page 49: ... paper Install a recording paper The other party s fax machine does not have a polling feature Check with the other party The other party s fax machine is busy or ran out of recording paper Try again The document is jammed Remove the jammed document Alternately turn off service code 559 to enable sending of documents longer than 600 mm A transmission error occurred Try again The unit is too hot Le...

Page 50: ...eding remove the jammed document as follows Open the cover by pressing the cover open button Remove the jammed document carefully Close the cover securely by pushing down on both ends 1 2 3 Note Do not pull out the jammed paper forcibly before opening the cover Cover open button ...

Page 51: ...guide provides a logical path of deduction to assist in locating a fault and suggests methods of restoring the unit to full working condition Use the reported symptoms of the fault to determine the best troubleshooting method Even difficult faults can be tracked to a specific block or area for example the Digital Board or Image Sensor A variety of fault descriptions from customers often point to t...

Page 52: ...rtical lines appear No feed Paper jam Multiple feed Skew Abnormal sound from the product Voltage output is abnormal Keys are not accepted If the electric circuit is the cause REMOVE DOCUMENT will be displayed Cannot communicate by fax Error code is displayed Cannot talk DTMF tone doesn t work Handset Monitor sound volume 34 34 35 33 28 29 30 31 35 74 78 79 38 38 The analog board may cause these sy...

Page 53: ... TONE mode Handset transceiver receive Monitor sound Ringer sound Dial operation Volume operation Key check LCD check Sensor check Handset transceiver receiver Remote control FAX operation Copy operation Telephone operation Operation panel Sensor Clock External Telephone OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG OK NG FUNCTION JUDGEMENT REFERENCE Check acc...

Page 54: ...f Q7 24 V Is the voltage at pin 11 of IC8 less than 2V Replace Q7 Check the motor and connector Is the phase signal from pins 126 130 of IC4 out put Is the solder at pins 126 130 of IC4 OK Replace IC8 OK OK OK OK OK OK OK OK YES END YES YES NO NO NG END NO NO NO YES NO YES NO YES NO Clean the separation roller page 103 Does the separation roller rotate Use the motor test function page 88 Adjust th...

Page 55: ...88 Repair or replace the sensor lever Go to the sensor section page 79 Check if the sensor reacts while the flag is moving Check if the separation feed and pinch rollers are attached correctly Repair the defective parts Check each sensor s movement Check each roller s mount Check the white plate Replace the white plate Clean each roller page 103 OK OK OK OK NG 2 Paper JAM OK OK OK NG NG NG NG YES ...

Page 56: ...e 103 Replace the separation pad roller and pressure spring Confirm whether the pad is dirty or not and if it is attached correctly Clean or replace the defective parts OK YES NO NG NG NG OK OK OK OK OK OK END END END When using thick paper etc if the document will not feed refer to the feed pressure adjustment page 92 ...

Page 57: ...lean or replace the defective parts Replace the separation pressure spring Replace the white plate Repair or replace the defective parts Check the balance of both separation pressure springs Check the white plate Check the CIS unit Clean each roller page 103 OK OK OK OK OK OK NO END END END END END END NG NG NG NG NG END NO NO NO NO YES YES YES YES OK OK OK OK OK OK OK OK OK OK OK Check whether th...

Page 58: ...n feed and pinch rollers are attached correctly Repair the defective parts Clean each roller page 103 If image distortion is within 1 5 this is considered normal Clean each roller page 103 Check the white plate Check each roller Check each roller for dirt or scratches Go to the read section page 80 OK OK OK OK END END END END YES YES YES YES NO NO NO NO NG NG NG NG NG OK OK OK OK OK Please perform...

Page 59: ...lease perform the print test page 88 Do lines appear Clean the feed route Clean the white plate and target glass thoroughly Do lines appear Replace the white plate CIS unit etc Go to the read digital board section page 59 OK END Replace the thermal head YES YES NG NO NO OK END ...

Page 60: ...image 8 Expanded print When printing Check the recording paper setling Reset the recording paper Replace the recording paper roller Check if the cover open button is locked Lock the cover open button Clean each roller pages 103 NG NG OK ...

Page 61: ...ve gear for damage inserted foreign objects and also if the pendulum gear spring is attached correctly Check the other rotation sections operations oscillation sections and fix or change the defective part Does the recording paper convey Confirm the drive section Defective Fix or change the defective part YES NO A Next page Check the document convey ance element ...

Page 62: ...ring A Does it recur Does it recur Change the gear and gear chassis Check each roller page 103 for damage inserted foreign objects or improper installation Fix clean or change the defective part Grease the motor and gear Do not apply large amounts of grease END OK END NO NO NO YES YES YES A ...

Page 63: ...when faxing Copying is also not possible The fax transmits successfully one time and fails another Copying is possible The fax receives successfully one time and fails another Copying is possible The fax completely fails to transmit or receive Copying is possible The fax fails either to transmit or receive when making a long distance or interna tional call Copying is possible No 1 No 5 Ref page 38...

Page 64: ...ommunication result is error Press down the READ SENSOR gently and immediately release it Clean the separation roller using a damp cloth Try again Rubbing alcohol Replace the separation roller Check if the sensor is installed properly Sensor section page No pages are fed ADF section 1 Defective facsimile section 1 Transmit problem YES NO NG NO NO NG NO YES YES YES OK Refer to page 28 Refer to page...

Page 65: ... started Does it start feeding The document goes through Ask the other party to change the RX equalizer increase the TX level Ask the other party to increase the TX level Ask the RX party to increase the RX error line value parameter Not available Confirm if the sent image on the RX side has many errors Change the 717 Transmit speed select to 7200 4800 or 2400 bps Change the 596 Transmit level set...

Page 66: ...ck each sensor RX problem Can something be RX Are there many errors on the image Increase the 595 RX error limit value to some value Change the 718 Receive speed select to 7200 4800 or 2400bps Ask the sender to Increase the 596 Transmit level set Is the FAX ring count 07 2 3 or 4 Change the FAX ring count to 1 Increase the 593 Time between CED 300 bps to some value Error code No 68 Echo Decrease t...

Page 67: ... of IC5 and Tip Ring Is the signal at pin 45 of IC5 dial tone input Replace IC5 Replace IC5 Check the trace between T1 and pin 15 of IC5 Is the signal at pins 3 of IC5 output Check the solder at pins 1 16 of IC5 Check the solder at pins 70 81 of IC1 OK OK Replace IC1 NG Check the solder at pins 1 16 of IC5 Check the solder at pins 70 81 of IC1 OK OK Replace IC1 NG 4 The unit can copy but cannot tr...

Page 68: ...time cannot be reduced Accordingly the following countermeasures should be attempted A The TEL FAX DELAYED RING count should be 1 User parameter code No 78 B As the 35 sec count starts directly after dialing or directly after the START button has been pressed for models with a START button the other party should be called manually if possible Another possibility is entering two pauses at the end o...

Page 69: ...n a CED signal is output If this signal is 2100Hz S1 and S2 will become ON Then the echo of the DIS signal output afterwards may be received and FAX1 may execute an erroneous operation preventing communication from starting Countermeasure B In the service mode the time setting between the CED signal and the DIS signal is set from 75 msec to 500 msec in the service mode code No 593 This is because ...

Page 70: ... mode code No 718 Summary Long distance and international communication operation SYMPTOM COUNTERMEASURE 1 If possible manual transmission should be made from the transmission side 2 If possible two pauses should be inserted at the end of the auto dial number on the transmission side 3 If possible the Function Selector Switch should be switched to FAX Does not receive in the automatic mode Does no...

Page 71: ...le of a journal report 2 RESULT PRESSED THE STOP KEY TECLA STOP PRESIONADA DOCUMENT JAMMED DOCUMENTO ATASCADO NO DOCUMENT NO HAY DOCUMENTO PRINTER OVERHEATED SOBRECALENTAMIENTO PAPER OUT SIN PAPEL OTHER FAX NOT RESPOND NO HAY RESPUESTA COMMUNICATION ERROR ERROR DE COMUNICACION COMMUNICATION ERROR ERROR DE COMUNICACION COMMUNICATION ERROR ERROR DE COMUNICACION COMMUNICATION ERROR ERROR DE COMUNICAC...

Page 72: ...57 58 59 64 68 70 72 FF SYMPTOM DCN is received after transmission of NSC and DTC DCN is received after DIS transmission 300BPS error DCN is received after FTT transmission DCN responds to a post message Polling is not possible No response at the other party after MCF or CFR is transmitted DCN is received after CFR transmission The carrier is cut when the image signal is received Modem error 9 10 ...

Page 73: ...he answering machine s message is on 3 Countermeasure YES YES NO NO 1 DCN is received after DCS transmission DCN is received after FTT transmission Reception is not EOP EOM PIN RTP or RTN Is the receiver s FAX machine in the out of pa per or mechanical error status Confirm the receiver s FAX ma chine Is it the same brand as your unit Ask the receiver to cancel the password of the receiver s FAX ma...

Page 74: ...ntioned mode on the receiving side Is communication OK Perform voice communication with the receiver End Check if the line is not inter rupted by noises or cross talk If not wait until the line is satisfactory for correct com munication 1 Raise the level of transmission Do not raise the level above the standard of each country If the communication is OK at the level beyond the standard it is due t...

Page 75: ...ulator and check the machine reception condition Is FTT sent from the receiver Perform voice communication with the NG caller Check if the line is not inter rupted by noises or cross talk If not wait until the line is satisfactory for correct com munication No response after the post message is transmitted three times RTN and PIN are received No response after FTT is transmitted No problem with th...

Page 76: ... Decrease the RX speed Does an error line exist on the received document RTN is transmitted PIN is transmitted to PRI Q PIN is transmitted Try again Perform the communication test using the LOOP simulator and check the machine reception condition Is the data sent correctly Modem test TEST CODE NO 554 Turn ON the FAX monitor func tion and have the receiver transmit the data again Does the communica...

Page 77: ...topped when the T1 TIMER expires Is the data sent correctly Modem test TEST CODE NO 554 Confirm if the receiver s FAX machine was set to the receivable mode Turn ON the FAX monitor func tion and have the receiver transmit the data again Is communication OK Is the FAX signal sound heard after the image data is received YES End YES YES NO NO NO 9 6 1 ...

Page 78: ...oll mode again and perform polling Ask the service section for the receiver s FAX machine to examine the unit Confirm if a mechanical problem occurred E g the caller inter rupted the transmission Was it a mechanical error as mentioned above Have the caller transmit the data again Ask the service section for the caller s FAX machine to examine the unit Check the hardware peripherals of the modem 30...

Page 79: ...hine to the receivable mode and communicate again Check if the line is not inter rupted by noises or cross talk If not wait until the line is satisfactory for correct com munication Ask the caller to transmit the data again Confirm if a mechanical problem occurred E g the receiver inter rupted the reception DCN responds to the post message DCN is received after FTT transmission No response at the ...

Page 80: ... above Ask the receiver to set the Poll mode again and perform polling Perform the communication test using the LOOP simulator and check the machine reception condition Is the carrier cut Modem test TEST CODE NO 554 Ask the service section for the receiver s FAX machine to ex amine the unit The carrier is cut when the image signal is received Polling is not possible NO YES NO 6 1 16 YES 15 ...

Page 81: ...er out put the setup list code 991 and service list code 999 from the customer s fax machine Based on this the parameters for the desired codes can be changed The procedure for changing and listing parameters is described on the next page Also before exiting the remote programming mode it is advisable to obtain a new list to confirm that only the desired parameters were changed Hint Since the conn...

Page 82: ...i sound to indicate that the setting is complete To make another setting To quit the remote programming mode ask the customer the call should still be connected to press the STOP key to return the machine to the normal mode Then hang up the phone If nothing is audible enter 9 0 0 0 again Three short high pitched beeps Pi Pi Pi sound if an invalid code was entered If this happens reenter the correc...

Page 83: ... TEL FAX delay ring 1 to 4 rings 1 OK 080 Set the default YES NO NO NG 501 Pause time set 001 600 X 100 msec 030 OK 502 Recall time set 01 90 X 10 msec 10 OK 503 Dial speed set 1 10pps 2 20 pps 10 OK 520 CED frequency select 1 2100Hz 2 1100Hz 2100 OK 521 International mode select 1 ON 2 OFF ON OK 522 Auto standby select 1 ON 2 OFF ON OK 523 Receive equalizer select 1 ON 2 OFF OFF OK 524 SND EQL 1 ...

Page 84: ...1st OK 595 Receive error limit value set 001 999 100 OK 596 Transmit level set 15 00dBm 10 OK 598 Modem sesitivity 20 48 45 OK 717 Transmit speed select 1 9600 2 7200 3 4800 4 2400bps 9600bps OK 718 Receive speed select 1 9600 2 7200 3 4800 4 2400bps 9600bps OK 719 Ringer off in TEL FAX mode 1 ON 2 OFF ON OK 721 Pause tone detect 1 ON 2 OFF ON OK 722 Redial tone detect 1 ON 2 OFF ON OK 763 Friendl...

Page 85: ... with the digital unit main board As there are many potential causes in this case ASIC etc it may be difficult to specify what you should check first If a mistake is made in the order of checks a normal part may be determined faulty wasting both time and money Although the tendency is to regard the problem as a serious one IC malfunction etc usually most cases are caused by solder faults poor cont...

Page 86: ...alfunctions are analyzed In past experiences digital IC especially SRAM and ROM malfunctions are extremely rare after installation in the product This may be repaired by replacing the IC ASIC etc However the real cause may not have been an IC malfunction but a soldering fault instead Soldering faults which are difficult to detect with the naked eye are common particularly for an ASIC and RA Resist...

Page 87: ...ART KLATCH KSCLK KTXD KRXD KIN0 KIN1 KIN2 KIN3 RS E VOL HEAD CTL XWDERR RD WR XRESETI A0 17 D0 7 CIS CTL LED ON ASIC IC1 32 768KHz 20 736MHz 24MHz T0 T2 T5 IC7 MOTOR DRIVER TO MOTOR TO OPE PANEL RX SP H S RX H S TX TX RXIN TXOUT ANALOG FRONT END IC5 ANALOG SW IC6 TO ANALOG SRAM IC3 A0 17 D0 7 RD WR IC7 5V 24V Q13 24V TH ON I O ANALOG PORT CONTROL TO SRAM IC3 ...

Page 88: ...s other than these even if they malfunction they do not directly affect booting up the system List 1 If these signals are normal once the power is turned on each IC repeatedly outputs 5V or 3 3V H and 0V L The following page shows NG and normal wave patterns D0 D7 Address Data Bus A A0 A16 Address Bus BRD Read Signal ROMCS ROM Select Signal WR Write Signal RAMCS SRAM Select Signal NG Wave pattern ...

Page 89: ...FT21LA Normal Wave patterns OK T T DT 1 T T DT 1 T T DT 1 T T DT 1 T T DT 1 T T DT 1 200ns div 1V div D0 D7 2 A0 A12 3 A15 4 RD 5 ROMCS 6 MDMCS 200ns div 1V div 500ns div 1V div 500ns div 1V div 100ns div 1V div 200ns div 1V div 1 ...

Page 90: ...So if the timing of these signals is even slightly off the circuit will not operate normally Even of the IC did malfunction the output voltage level may become abnormal but the timing is accurate according to the specifications If oscillation is provided accurately Accordingly the problem presented here is whether each IC outputs the correct signal See the I O direction diagram on the next page In...

Page 91: ...GUIDE 65 KX FT21LA I O and Pin No Diagram XRESET 17 106 107 110 112 94 105 XWR 115 XRD 113 XROMCS 112 104 111 IC1 ASIC RA1 RA2 RA3 RA4 RA5 2 A12 A16 2 A0 A11 3 WR 3 RD 3 ROMCS 1 D0 D7 RESET 3 RAMCS 6 XRAMCS R9 R10 R12 ...

Page 92: ...KX FT21LA 66 1 D0 D7 11 13 15 19 1 10 21 23 26 IC3 SRAM RAMCS 20 RD 22 WR 27 2 A0 A7 2 A8 A14 3 A0 A7 4 A8 A16 1 D0 D7 13 15 17 21 2 12 23 29 IC2 ROM RD 24 ROMCS 22 ...

Page 93: ... status by test types A B C and D See page 68 See page 69 See page 70 NG OK OK 1 Power check 2 Oscillation 3 Reset 4 Check each signal line Reset IC1 ASIC 14 pin 5V 0V 4mS D0 D7 A0 A16 RD ROMCS WR RAMCS A A B C Constant 5V C Constant 5V Constant 0V B Constant 0V WDERR A WDERR Use this order 1 2 3 After the power is turned on the ASIC CPU initializes and checks each IC The ROM SRAM and Modem are ch...

Page 94: ...efer to page 62 B C D 0V 0V 0V 0V 5V 0V 0V 0V 5V 5V 0V 0V 5V 0V 0V A 5V 0V 0V 5V 0V Turn off the power supply Short using a metallic object such as tweezers between the test and GND land and turn on the AC power Check the following voltages by using an oscilloscope or tester To cancel the status check mode turn off the AC power This indicates that the Add Data Bus RAM ROM MODEM and ASIC are all co...

Page 95: ... IC1 1 2 3 IC3 Chip 470 Solder waste Solder ball Short circuit from the adjacent signal wires Check for a short circuit in the RA and IC leads and the signal wire at the through hole Short between the signal line and GND OR IC malfunction Solder fault on RA NG Example Through hole ...

Page 96: ... CALL SERVICE LCD display This display occurs when the temperature of the thermistor on the terminal head is NG Faulty connection of the thermal head connector ASIC IC1 pins 193 and 207 or the thermistor on the thermal head is NG LCD display OK OK NG Check the LCD WDERR RESET RESET Example ASIC Chip 3 3V Open the circuit inside Replace the CPU ...

Page 97: ...TROUBLESHOOTING GUIDE 71 KX FT21LA MEMO ...

Page 98: ...15 IC1 4 5 8 SPEAKER FAX Rx TEL LINE T1 C14 R13 IC2 2 1 CN1 10 CN2 10 IC6 10 11 R33 C43 IC5 15 DTMF TEL LINE FAX Tx DUMMY Ring Back Tone Note digital board IC5 3 C48 R37 R38 IC9 2 1 C54 R44 IC8 2 1 C27 R13 IC1 62 63 C62 IC8 5 7 R60 C63 IC6 8 9 C65 CN2 16 CN1 16 R21 Q2 B C C31 SPEAKER TEL LINE RLY1 3 5 detection for Ext TEL CN5 J5 R36 C35 R32 T1 C14 R13 IC2 2 1 CN1 10 CN2 10 IC6 10 11 R33 C43 IC5 1...

Page 99: ...C6 and pin 19 of IC4 Check that the DTMF signal is being output from pin 3 of IC5 on the digital board Check that the DTMF signal is being output at the points on the DTMF circuit send route Check the bell detect circuit R37 C35 PC1 etc on the analog board Check the path over which the bell signal is sent to the speaker Check IC5 and pin 70 81 of IC1 on the digital board Replace Q3 Does pin 99 of ...

Page 100: ...Over Voltage Circuit 3 9 POWER SUPPLY SECTION 1 Key components for troubleshooting The following components have been known to break frequently F101 D101 D104 C109 Q101 PC101 ZD203 R302 This comes from our experience with experimental tests For example power supply lightning surge voltage test withstanding voltage test intentional short circuit test etc Caution If you find a melted fuse in the uni...

Page 101: ...leshooting in our lab Before turning on the power supply you should check F101 ls F101 open YES Replace F101 D101 D104 is short YES Replace D101 D104 NO NO 24V output OK 24V output OK 5V output OK Replace the broken part Replace IC202 NO NO YES Does D105 D106 D107 PC101 or Q102 short YES YES NO NO D G D S S G Q101 short Replace Q101 YES NO Control circuit check A A ...

Page 102: ...225 short or open 24V output OK Replace the broken part Does D201 Q201 D202 or D203 short YES NO YES NO NO Replace the broken part YES NO A A 24V output OK Is R102 R103 R104 or R105 short or open NO YES Replace the broken part YES NO Control circuit check A ...

Page 103: ...the peripheral circuit of Q101 This is due to a very high voltage through the Gate circuit which is composed of R105 Q102 and D107 You should change all of the parts listed as follows F101 Q101 R105 Q102 D107 D201 If D201 is broken the oscillation circuit in the power supply cannot operate Check it with an electric tester D204 If D204 shorts the voltage feedback circuit is almost always the cause ...

Page 104: ...ion board is disconnected Keys occasionally don t work Check if CN6 and CN7 digital board or CN1 and CN2 operation board is disconnected Is the cable and connector between the LCD and operation board disconnected YES NO Replace the LCD Repair Perform an LCD check refer to page 90 to determine if the LCD is operating correctly NG OK END Check IC1 operation board Repair the keys YES OK END NO Repair...

Page 105: ... CN1 and pin 8 of IC1 is low level Check the voltage at pin 3 of CN2 Document set 0V No document 4 5V When the pin 2 of CN1 and pin 8 of CN1 is low level Replace PS2 Replace PS1 Check the soldering at Q2 Q3 D1 R11 Check the soldering at Q1 Q3 D1 R11 OK Check the soldering at R12 Check the soldering at R12 NG NG OK OK OK OK OK Check if CN6 and CN7 digital board or CN1 and CN2 operation board is dis...

Page 106: ...white panel on the back of the operation block clean Conduct a scanner test in service mode 555 Is the LED array lit Is pin 10 of CN8 on the digital board at 23 to 24V Check the 24V line of the power supply Check R82 J2 Clean the location in question Is pin 3 of CN8 on the digital board at 4 to 5V NG OK NO NO NO YES YES YES Next page Next page B A ...

Page 107: ...on the digital board Observe the waveform at test point TP12 on the digital board with an oscilloscope while scanning the white panel Apply a trigger at the rising edge of CH2 given the following settings CH1 0 2V div connect to TP12 CH2 5V div connect to TP14 Time 1ms div YES NO Check the image sensor NO YES A B 0 2V 0 8V ...

Page 108: ...During copying is pin 5 of Q13 on the digital board at 23 to 25V Check the route between pin 1 of CN1 and pin 1 of Q13 on the digital board Check the voltage at pin 207 of IC4 on the digital board See page 119 Check the solder points of pin 159 160 163 166 167 of IC1 on the digital board Make the necessary repairs YES NO NG OK NO 3 13 THERMAL HEAD SECTION Refer to page 122 for circuit operation YE...

Page 109: ...us functions The Set Functions are accessed by entering their code changing the appropriate value then pressing the SET key The Test Functions are accessed by entering their code and pressing the key listed on the menu While programming to cancel any entry press the STOP key 4 2 OPERATION FLOW Programming User mode user programmable Service mode not user programmable 2 SET mode 1 TEST mode Normal ...

Page 110: ... 4 3 USER MODE The list below is an example of the SYSTEM SETUP LIST the unit prints out CARACTERISTICAS BASICAS CARACTERISTICAS AVANZADAS Note The above values are the default values Code Set Value Code Set Value ...

Page 111: ...ding cannot be performed correctly set to ON 544 Selecting the document feed position 01 99 step 00 99 When the ADF function is incorrect adjust the feed position 8 step 1mm 550 Memory clear Press START COPY SET 551 Press START COPY SET 553 Setting the FAX monitor function 1 OFF 2 PHASE B 3 ALL 1 2 3 OFF Sets whether to monitor the line signal with the unit s speaker during FAX communication or no...

Page 112: ...15 00 10 dBm Selects the FAX transmission level Increase the level when the telephone line condition is poor 598 Modem sensitivity 20 48 45 See page 42 717 Transmit speed select 1 9600BPS 2 7200BPS 3 4800BPS 4 2400BPS 1 4 9600 BPS Adjusts the speed to start training during FAX transmission 718 Receive speed select 1 9600BPS 2 7200BPS 3 4800BPS 4 2400BPS 1 4 9600 BPS Adjusts the speed to start trai...

Page 113: ...DATE Date and time which are set by a user for the first time after purchase TIME is the expiration from the first power on after purchase 2 KEY OPERATION Indicate 2 digit codes Refer to Button Code Table on page 89 1st 50 History of the key operation from 1st to 50th after purchase Last 50 History of the last 50 key operations 3 NUMBER of COPY The number of pages copied 4 NUMBER of RX The number ...

Page 114: ...d RX roller at 400pps 2 2 phase 4 Turn forward RX roller at 400pps 1 2 phase 5 Turn forward TX RX roller at 400pps 1 2 phase 6 Reverse the motor at 400pps 1 2 phase 7 Set the cam gear to the home position 8 Set the cam gear to the RX mode 9 Set the cam gear to the copy mode Press the STOP button to cancel Prints a test pattern and checks the thermal head for abnormalities missing dots etc and also...

Page 115: ...ODE TABLE Note These codes 00 01 are only for the data in the History Report When set to OFF 2 the 12 keys and transmission frequencies are as shown When set to ON 1 the 12 keys and transmission frequencies are as shown Note After performing this check do not forget to turn the setting off Otherwise dialing using DTMF will not be possible Low Hz High Hz 1336 1 4 7 1209 1477 697 770 852 941 2 5 8 0...

Page 116: ...inated by No Response were not displayed in the JOURNAL When a fax transmission cannot be performed because the other party s unit is set to the TEL mode No response will be printed 6 EQM EQM means Eye Quality Monitor Used only at the factory 7 ERROR LINE RX When an error occurs while receiving a fax this shows the number of error lines 8 MAKER CODE This shows a 2 digit code of the other party s f...

Page 117: ...TROUBLESHOOTING GUIDE 91 KX FT21LA 6 1 PRINTOUT EXAMPLE ...

Page 118: ...KX FT21LA 92 ADJUSTMENTS Page 1 Adjusting the Feeder Pressure 93 ...

Page 119: ... the front lid open 2 Shift the position of the lever using an instrument with a pointed end such as paper clip Right When documents do not feed Center Standard position pre selected Left When documents multiple feed 3 Close the front lid by gently pressing down on both ends Note Touch the lever using an instrument with a pointed end such as ball point pen because the lever is located in a small p...

Page 120: ...8 5 How to Remove the Bottom Frame 99 6 How to Remove the Analog Board and Digital Board 99 7 How to Remove the Power Supply Board and AC Inlet 100 8 How to Remove the Motor Block 101 8 a How to Remove the Motor Block 102 9 How to Remove the Image Sensor 103 10 How to Remove the Rollers 103 11 How to Remove the Thermal Head Roller 104 12 How to Remove the Document Tray 105 13 How to Replace the Fl...

Page 121: ... No 1 Procedure 1 1 Push the front lid open button 2 Push the tabs with a screwdriver See Fig A 3 Remove the handset cradle cabinet HOW TO REMOVE THE HANDSET CRADLE CABINET VIEW VIEW Caution Be careful not to damage the tabs with a screwdriver ...

Page 122: ...KX FT21LA 96 Ref No 2 Procedure 1 2 1 Remove the handset cradle cabinet 2 Remove the hook button 3 Remove the speaker HOW TO REMOVE THE HOOK BUTTON AND SPEAKER SPEAKER HOOK BUTTON ...

Page 123: ... Lift up the operation block Ref No 3 3 HOW TO REMOVE THE OPERATION BLOCK Note The arm cannot be removed if the operation panel is opened all the way Open the operation panel approximately at a 45 to 60 angle to remove the arm Remove the arm while pushing the operation panel to the left as in Fig A While lifting up the upper cabinet with your hands push the opera tion panel to the right and remove...

Page 124: ...TION RUBBER DOCUMENT GUIDE A A A A Ref No 4 Procedure 3 4 HOW TO REMOVE THE OPERATION BOARD AND LCD 1 Remove the 4 screws A and the operation block cover 2 Remove the operation board 3 Remove the document guides HOW TO CLEAN Clean the roller with a cloth soaked in alcohol ...

Page 125: ... 5 HOW TO REMOVE THE BOTTOM FRAME Ref No 6 Procedure 5 6 HOW TO REMOVE THE ANALOG BOARD AND DIGITAL BOARD 1 Remove the 2 screws A 2 Remove the 1 connector 3 Remove the analog board 4 Remove the 7 connectors 5 Remove the digital board A A B A A A A A A A A CONNECTOR A CONNECTORS B ANALOG BOARD DIGITAL BOARD ...

Page 126: ...POWER SUPPLY BOARD AND AC INLET 1 Remove the 1 screw A and remove the connector 2 Remove the power supply board 1 Remove the 1 screw B 3 Remove the AC inlet Ref No 7 Procedure 5 6 7 POWER SUPPLY BOARD AC INLET A B CONNECTOR CONNECTOR ...

Page 127: ...DISASSEMBLY INSTRUCTIONS 101 KX FT21LA HOW TO REMOVE THE MOTOR BLOCK Ref No 7 Procedure 5 8 1 Remove the 2 screw A 2 Remove the MOTOR BLOCK MOTOR BLOCK A A ...

Page 128: ... 8 2 3 4 SW MOTOR 1 Remove the SW 2 Remove the MOTOR 3 Remove the CHASSIS 1 Remove the SPRING 2 Remove the gear 1 3 Remove the gear 2 4 Remove the gear 3 5 Remove the screws A 6 Remove the gear 4 1 Remove the screw A 2 Remove the gear 5 3 Remove the gear 6 4 Remove the gear 7 5 Remove the gear 8 ...

Page 129: ...sensor See Ref No 9 2 Remove the rollers 3 Remove the stopper with a flathead screwdriver Fig B 1 Remove the analog board and digital board See Ref 6 2 Remove the roller 3 Remove the stoppers from the roller shaft and replace the roller Fig A Fig B HOW TO CLEAN Clean the roller with a cloth soaked in alcohol IMAGE SENSOR CIS SHEET Refer to Fig A Fig A STOPPER STOPPER SEPARATION ROLLER STOPPER STOP...

Page 130: ...OVE THE THERMAL HEAD ROLLER Fig A 1 Push the front lid open button in the direction of the arrow to open the operation block 2 Remove the head cover 3 Remove the lock lever shaft with a screwdriver as shown in Fig A 4 Remove the 2 connector 5 Remove the thermal head 6 Remove the lock lever ...

Page 131: ...ef No 12 Procedure 12 HOW TO REMOVE THE DOCUMENT TRAY 1 Push the bottom of the tray in the direction of the arrows Ref No 6 for page Harness installation position To prevent harnesses from getting caught during the installation PAPER STACKER ...

Page 132: ... ß F 350 10 An expert may handle a 60 80 W iron but a beginner might damage the foil by overheating Flux HI115 Specific gravity 0 863 Original flux should be replaced daily 2 Using a cutter cut the lead at the source Cut the contents with a cutter lightly 5 or 6 times Cutter Solder 1 When all of the IC lead cannot been seen at the standard degree fill with large quantities of solder Note If you do...

Page 133: ...soldering iron 4 BRIDGE MODIFICATION PROCEDURE 1 Lightly re solder the bridged portion 2 Remove the remaining solder along the pins using a soldering iron as shown in the figure below Soldering iron bridge Specified solder Flux Temporary soldering point After removing the Flat IC and when attaching a new IC remove any of the excess solder on the land using the soldering wire etc If the excess sold...

Page 134: ... 5 LED Array 120 4 Facsimile Section 120 132 4 1 Image Data Flow during Facsimile Operation 120 121 4 2 Thermal Head 122 123 4 3 Scanning Block 124 4 4 Stepping Motor Drive Circuit 125 4 5 Gear Section 126 129 4 6 Sensor and Switches 130 132 5 MODEM Section 133 140 5 1 Function 133 138 5 2 MODEM Circuit Operation 139 140 6 NCU Section 141 142 7 ITS and Monitor Section 143 8 EXT TEL 144 145 9 Opera...

Page 135: ...IN3 KSTAR KSCLK KLATC KTXD KRXD DG NC POWER SUPPLY BOAD THERMAL HEAD DIGITAL BOARD ANALOG BOARD OPERATION PANEL SPEAKER LCD TO TEL LINE TO EXT TEL 1 2 3 4 5 6 1 2 3 4 5 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 1 2 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4...

Page 136: ...c RAM IC3 This memory is used mainly for the parameter working storage area 4 MODEM Modem for the FAX 5 Read section Contact Image Sensor CIS to read transmitting documents 6 Thermal Head Contains heating elements for dot matrix image printing 7 Motor driver IC7 Drives the motor and CIS LED 8 Reset circuit IC4 Provides a reset pulse to each of the major ICs 9 Analog board Composed of an ITS circui...

Page 137: ...K HANDSET SPEAKER 24V 5V RLY ANA LOG SW LCD SENSOR KEY MATRIX CPU OP PANEL I F IMAGE PROCESSING MOTOR I F MOTOR SENSOR ROM 1M SRAM 256k OSC I O A D RESET REG RTC CIS THERMAL HEAD 24V 24V AC120V 5V 5V 5V MODEM REG MOS SW 3 3V PRINTER CONTROL I F ROM SELE CTOR VOL SP AMP SP MUTE HOOK SW PAPER PC CODEC General Block Diagram ...

Page 138: ...or 3 VDDRTC 3 3V BATT 32 768kHz backup pow er supply for RTC 4 XBACKEN VDDRTC YES XRESET Backup enable 5 VDDSRAM 3 3V BATT RAMCS buffer backup pow er supply for reset 6 XRAMCS VDDSRAM VDDSRAM SRAM chip select H 3 3V or BATT 7 XRAMCE2 ALARM VDDSRAM OPEN Not used 8 FTG MULT3 5 NO FTG O FTG 9 F1 MULT3 5 NO F1 O F1 50 75 selector 10 MULT3 5 5V Pow er supply 11 VSS DG Ground 12 F2 OP50 MULT3 5 NO E O L...

Page 139: ...T 3 3V YES XINTMDM Modem interrupt 68 XINTMDM 3 3V XMDMINT Modem INT output general output 69 XNMI XINT 3 3V YES XNMI NMI 70 EYECKO MULT3 5 NO EYECKO Modem AFEconnection APDMCK 71 APDMDT 3 3V YES APDMDT Modem AFEconnection 72 C3 MULT3 5 NO C3 Modem AFEconnection 73 C4 MULT3 5 NO C4 Modem AFEconnection 74 C5 MULT3 5 NO C5 Modem AFEconnection 75 MULT3 5 5V Pow er supply 76 DPDMDT MULT3 5 NO DPDMDT M...

Page 140: ...11 3 3V 11 Address bus 131 ADR12 3 3V 12 Address bus 132 RBA0 3 3V A13 Bank address 133 RBA1 3 3V 14 Bank address 134 RBA2 3 3V 15 Bank address 135 RBA3 3 3V 16 Bank address 136 RBA4 3 3V 17 Bank address 137 RBA5 OP 3 3V 18 Not used 138 RBA6 IOP 3 3V NO 19 O Not used 139 XRESCS1 OP72 3 3V OPEN Not used 140 XRESCS2 OP71 3 3V OPEN Not used 141 XMDMCS OP 3 3V OPEN Not used 142 VSS DG Ground 143 XRESC...

Page 141: ... PULL DOWN Pull dow n 179 KEYIN0 3 3V YES KIN0 I O Key read 180 KEYIN1 3 3V YES KIN1 I O Key read 181 KEYIN2 3 3V YES KIN2 I O Key read document sensor control 182 KEYIN3 3 3V YES KIN3 I O Key read read start position sensor control 183 KEYIN4 3 3V YES OPEN O Not used 184 KEYIN5 3 3V YES OPEN O Not used 185 OPLED 3 3V YES OPESEL OD Operation panel control 186 VSS DG GND 187 3 3V 3 3V OD Pow er sup...

Page 142: ...0 KIN1 KIN2 KIN3 RS E VOL HEAD CTL XWDERR RD WR XRESETI A0 17 D0 7 CIS CTL LED ON ASIC IC1 32 768KHz 20 736MHz 24MHz T0 T2 T5 IC7 MOTOR DRIVER TO MOTOR TO OPE PANEL RX SP H S RX H S TX TX RXIN TXOUT ANALOG FRONT END IC5 ANALOG SW IC6 TO ANALOG SRAM IC3 A0 17 D0 7 RD WR IC7 5V 24V Q13 24V TH ON I O ANALOG PORT CONTROL TO SRAM IC3 3 1 BLOCK DIAGRAM ...

Page 143: ... will prohibit the RAM IC3 from changing data The RAM IC3 will go into the backup mode when it is backed up by a lithium battery Circuit Diagram Timing Chart 3 The watch dog timer built in the gate array IC1 is initialized about every 1 5 ms When a watch dog error occurs pin 18 of the gate array IC1 becomes low The terminal of the WDERR signal is connected to the reset line so the WDERR signal wor...

Page 144: ... switch is OFF backed up by a lithium battery 2 Circuit Operation When the power is turned ON power is supplied RAM IC3 and RTC IC1 At this time the voltage at pin 28 of RAM is 5V and pin 3 of RTC IC1 is 3 3V When the power is turned OFF the BATT supplies the power to RAM and RTC through J1 R14 D1 or D7 At that time the voltage at pin 28 of RAM and pin 3 of IC1 are about 2 5V When the power is OFF...

Page 145: ...ure and uses the thermistor s characteristics The output of pin 193 of IC1 becomes a low level Then when it becomes a high level it triggers point A In point C according to the voltage output time the thermal head s temperature is detected After the thermal head temperature is converted to voltage in B it is then changed to digital data in the A D converter inside IC1 The CPU decides the strobe wi...

Page 146: ...the draft s information image processing white is regarded as 0 and black is regarded as 1 Then via routes 4 and 5 they are stored in RAM 4 The white black data stored as above is input to the P S converter via routes 6 and 8 The white black data converted to serial data in the P S converter is input to the Thermal Head via route 9 and is printed out on recording paper Note Standard Reads 3 85 tim...

Page 147: ...RAM IC2 ROM 11 12 SYSTEM BUS Analog Front End NCU TEL LINE P S CONVERTER THERMAL HEAD 15 14 CPU RAM MODEM IMAGE PROCESSING SECTION A D ANALOG SIGNAL CONTACT IMAGE SENSOR PROCESSING SECTION IC1 2 1 9 3 7 8 4 5 6 10 13 IC5 AFE Block Diagram ...

Page 148: ...ing body causing heat emission Here the three line strobes STB1 to STB2 impress at intervals of 9 216 msec as required for one line printout The sequence is shown on the next page Moreover for the strobe width the thermistor value inside the thermal head is detected according to IC1 pin 207 See page 116 Depending on that value the strobe width is recorded in ROM IC2 Accordingly the strobe width is...

Page 149: ... 207 C77 R73 R66 C75 L3 L18 C74 THERMISTOR THERMAL HEAD NO 1 NO 2 NO 19 LATCH REGISTER SHIFT REGISTER LATCH REGISTER SHIFT REGISTER 192DOT 192DOT 1 6 11 7 Q8 LATCH GND Circuit Diagram 10 THDAT 7 THCLK 2 THLAT 3 STB1 9 STB2 9 216 msec COPY PRINT DATA 3 0µsecX1728 5 184msec NEXT LINE PRINT DATA 3 0µsec 3 0µsec 3 0µsec 3 0µsec about 4 0 msec at 25 C about 3 2 msec at 25 C TEMPERATURE OF THERMAL HEAD ...

Page 150: ...ginal is inserted and the start button pressed pin 154 of IC1 goes to a high level and the transistor inside IC7 turns on This applies voltage to the LED array to light it The contact image sensor is driven by each of the FTG F1 signals output from IC1 and the original image illuminated by the LED array undergoes photoelectric conversion to output an analog image signal AIN The analog image signal...

Page 151: ...e output from gate array IC1 causing driver IC7 to go ON The motor coil is energized sequentially in 2 phase increments or 1 2 phase increments which causes a 1 step rotation A 1 step rotation is 0 13mm of recording paper or document paper The timing chart is below Timing Chart 2 Phase Copy FAX Function Mode Drive Phase Pattern Speed Fine Half Tone Super Fine STD Fine Half Tone Super Fine Paper Fe...

Page 152: ...n FAX reception the motor and copying 4 5 1 Mode Selection When the motor attached to the Drive Motor Gear G7 rotates counterclockwise CCW Swing Gear A 2 engages the CAM and the CAM turns counterclockwise to select a mode There are three mode options controlled by the Switch A Transmit mode B Receive mode and C Copy mode In Fig B you can see which mode is selected by the position of the rib in the...

Page 153: ...hen the Swing Gear A 1 controls the mode operation A Transmit mode Swing Gear A 1 engages G6 and conveys its drive power to the Separation Roller Gear for pre feeding documents B Receive mode Swing Gear B engages G8 and conveys its drive power to the Platen Roller Gear for printing the received data C Copy mode Swing Gear A 1 and B engage Gears 6 and 8 respectively and drive both the Separation Ro...

Page 154: ...rotates cow and the document is ejected END 2 Scanning Is the recording paper installed in the paper cassette properly Is the data received The motor rotates CW and the received document is printed The motor rotates CCW and the recording paper is ejected The motor rotates CW and the CAM is set to the Transmit mode A The motor rotates CCW and the CAM is set to the Receive mode B END 3 Printing Note...

Page 155: ...PS1 turn ON The motor rotates ccw and the document data is scanned by the Image Sensor and the recording paper is printed until the Read Position Sensor PS2 turns OFF The motor rotates ccw and the CAM is set to the Receive mode B The motor rotates cw and the recording paper is ejected The motor rotates cw and the CAM is set to the Transmit mode A The motor rotates ccw and the document is ejected E...

Page 156: ...er Sensor Circuit Location Sensor Sensor or Switch name Digital SW1 SW3 Cover Open and Paper Set PS2 Document Read Position uCHECKCOVER vand uOUTOFPAPER v uREMOVEDOCUMENT v Sensor Locations MOTOR Position 4 6 SENSORS AND SWITCHES All of the sensor and switches are shown below Analog Operation Panel SW2 Hook SW PS1 Document uCHECKDOCUMENT v ...

Page 157: ...el Digital Board Recording Paper Sensor SW1 When there is no recording paper the plate is separated from the switch lever and the switch turns off Pin 9 of CN1 Analog board becomes a high level When there is recording paper the plate pushes the switch lever and the switch turns ON Pin 9 of CN1 Analog board becomes a low level PLATE 5V R3 R1 C1 SW1 9 CN1 Signal CN1 9 Pin Paper Low level No paper Hi...

Page 158: ...SHELTER PLATE R10 Document Sensor PS1 When a document is set the shelter plate closes the sensor light the phototransistor becomes OFF and the input signal of the CN2 3 pin Operation becomes a high level When there is no document the shelter plate passes the sensor light the phototransistor becomes ON and the input signal of the CN2 3 pin Operation becomes a low level When checking this sensor the...

Page 159: ... 3 85 lines mm Group II G2 Using reduction technology in the modulation demodulation format an A 4 size document is sent at an official scanning line density of 3 85 lines mm for about 3 minutes Methods to suppress redundancy are not used Determined in 1976 Group III G3 A method of suppressing redundancy in the image signal prior to modulation is used An A 4 size document is sent within about one ...

Page 160: ...cument contents have been sent to confirm that the document was in fact sent and to check for telephone reservations and or the existence of continuous transmission 5 Facsimile Standards Connection Control Mode Terminal Control Mode Facsimile Signal Format Modulation Mode Transmission Speed Redundancy Compression Process Coding Mode Resolution Line Synchronization Signal 1 Line Transmission Time m...

Page 161: ...receiving unit e g recording paper width transmission speed Bell Detection Checks the receiving preparations and line condition Receive preparation OK Record Start Record Stop Reception OK Disconnect Function Notifies the capacity of the receiving unit The added data signals are as follows Bit No 1 2 3 4 5 6 Transmitter T 2 operation Reserved for future T 3 operation features Receiver T 3 operatio...

Page 162: ...ation DCS Data signaling rate 2400 bit s V 27 ter 4800 bit s V 27 ter 9600 bit s V 29 7200 bit s V 29 Vertical resolution 7 7 line mm Two dimensional coding Recording width 1728 picture elements along a scan line length of 215 mm 1 2432 picture elements along a scan line length of 303 mm 1 2048 picture elements along scan line length of 255 mm 1 Invalid Maximum recording length A4 297 mm Unlimited...

Page 163: ...tandard facsimile units conforming to T 3 must have the following capability Index of cooperation IOC 264 Note 1 Standard facsimile units conforming to T 4 must have the following capability Paper length 297 mm Training 1 CFR Confirmation to Receive Training 2 Signal X0100001 Identification Signal Format TCF Training Check A fixed pattern is transmitted to the receiving side at a speed 2400 to 960...

Page 164: ...Interrupt EOP PIP Procedural Interrupt Positive Refer to the next page X1110100 X0110001 X1011111 X1110010 X1111100 X0110101 Basic Facsimile Technique Facsimile 4 15 12 16 18 13 4 2 2 3 8 Black White b Part of document c Run length and image signals equivalent to b a Document d Codification of c according to MH formula Run length Code for White Line 00110101 000111 0111 1000 1011 1100 1110 1111 10...

Page 165: ...ge 72 2 Facsimile Reception The analog image data which is received from the telephone line passes through the NCU section and enters pin 15 of the analog front end IC5 The signals that enter pin 15 of the analog front end IC5 convert the analog signals to the digital signals then the data is sent to the modem IC1 Refer to CHECK SHEET on page 72 3 DTMF Transmission The DTMF signal generated in the...

Page 166: ... Board R3 R1 R2 R4 R37 R32 CN4 PC T1 RLY1 RLY1 24V POS1 SA1 SA2 LINE RLY BELL HANDSET CN5 CN3 CN2 VOL MODEM ASIC IC1 Analog Front End IC5 SW2 SW1 PAPER HOOK H STX H SRX SPOUT SPEAKER SP AMP SP MUTE H SRX ENB TEL RX ENB LINERX LINETX MTX ENB H STX MUTE MOM RX ENB T T1 R R1 ...

Page 167: ...y this relay switches to the external telephone side break and switches to the open side make when the unit starts facsimile communication Pulse dialing is also performed by ON OFF of the relay 6 3 BELL DETECTION CIRCUIT 1 Circuit Operation The signal waveform for each section is indicated below The signal low level section input to pin 19 of ASIC IC4 on the digital board is read Between the Tip a...

Page 168: ...1 pin 11 and output to the TEL line through C6 R14 and T1 Without a side tone circuit the transmission signal would return to the reception amplifier via C6 and R14 Here the signal output from CN1 pin 11 passes through C6 C36 and R12 and enters the amplifier IC2 pin 3 This is used to cancel the return portion of the transmission signal This is the side tone circuit Transmission Signal CN1 11 C6 R1...

Page 169: ...ITOR SECTION 7 1 GENERAL During the monitor operation the speaker output passes through the power amplifier IC1 Analog board The DTMF signal is output from the modem IC1 digital board The alarm tone the key tone bell tone and beep are output from gate array IC1 digital board During a pulse dial operation the monitor tone is output from gate array IC1 7 2 MONITOR CIRCUIT 1 Function This is the func...

Page 170: ...y EXT TEL is disconnected when the unit is OFF HOOK 1 EXT TEL DC LOOP Signal Path T CN4 3 POS1 J8 RLY1 3 5 R36 J5 CN5 4 EXT TEL CN5 3 J6 J7 CN4 4 R 2 REMOTERECEIVING This is the parallel connection DTMF signal for the TEL or EXT TEL mode between T and R When the other party is a FAX the unit changes to FAX receiving Signal Path Refer to CHECK SHEET on page 72 ...

Page 171: ...1 b1 J7 J8 J5 J6 J9 RLY1 4 3 5 R36 R37 R33 C35 C43 C37 C16 R32 R31 PC1 IC6 11 CN2 10 CN1 10 10 Analog Board Digital Board To IC5 5VD 1 2 3 4 D6 D7 24V Q3 R43 RLY1 1 2 CN1 5VA R13 R7 R6 C7 C5 C14 R11 R401 C10 4 3 2 1 5 IC2 2 0V 300V 1000V R24 6 5 1 4 T1 Circuit Diagram ...

Page 172: ... the digital board Fig a 10 1 KEY SCAN When CN1 8 OPSEL is H the analog switch IC1 is available The KLATCH KSCLK and KTXD control the analog switch IC1 to read at KIN0 3 Analog Switch IC1 Control Key Matrix 0 KIN0 KIN1 KIN2 KIN3 MONITOR 4 7 SW7 SW14 SW22 SW29 1 8 2 5 SW6 SW13 SW21 SW28 FUNCTION 3 VOLUME LOW LOWER VOLUME HIGH SW5 SW12 SW20 SW27 STOP MODE START COPY SET SW8 SW15 SW30 DIRECTORY FUNCT...

Page 173: ...FT21LA 9 2 SENSOR DETECTION When CN1 8 OPSEL is L the detection of the document sensor and read start position sensor are available 9 3 LCD CONTROL KTXD KSCLK KLATCH and KSTART are sent as D4 D7 to control the LCD LCD D4 D7 E RS ...

Page 174: ...Wave Form 0 Voltage Wave Form 0 E F G H T101 D201 n2 n1 V0 V1 VIN IIN Q101 C201 0 t TOFF TON VIN VO 0 t TOFF TON VIN VO n1 n2 Input side Output side Input side Output side a Principle of the RCC method b When the number of transformer windings is one to one c When the ratio of the number of transformer windings is n1 n2 Vo is kept constant by varying the ratio of the time intervals of TON and TOFF...

Page 175: ...is high Response to Variations in Output Current In this case VO is kept constant by controlling only TON without changing the ratio between TON and TOFF in response to variations in output current Figure B a and b shows how TON varies in response to variations in output current The input current must be increased as output current increases making TON longer The value obtained by dividing the sur...

Page 176: ...efined by changing the ON period of the main transistor This is shown as follows When the output voltage of the 24V circuit increases the current of the photo coupler PC101 increases the pulse width of the output control IC becomes narrower and the ON period of Q101 becomes shorter Over Current Limiter O C L The highest Ton while Q101 is ON is limited by a limiter circuit control Circuit of 24V Th...

Page 177: ...oltage measurements are taken with an oscilloscope or a tester with a ground 2 The schematic diagram and circuit board may be modified at any time with the development of new technology Important safety notice Components identified by a mark have special characteristics important for safety When replacing any of these components use only the manufacturer s specified parts ...

Page 178: ...KX FT21LA 152 MEMO ...

Page 179: ... D5 C71 1 32 Q13 1 1 11 1 1 11 6 8 5 4 C76 C77 D2 C21 16 17 C10 C88 TP6 PFUP1147Z C13 C14 C1 C2 C8 C3 C17 C87 C86 C41 C38 R27 R37 R25 R24 R88 R87 R31 R33 R42 R59 C64 R43 R52 R54 R51 R50 R49 C59 C58 Q6 R9 C25 C80 C52 R32 C43 C46 C48 C26 TP9 TP8 TP7 C31 C89 C29 C30 C37 C35 J5 1 8 L2 J9 R79 A L5 L18 R98 R81 R36 R12 R19 D7 1 16 R80 R2 R86 R85 J2 J3 1 10 IC3 IC5 J8 D1 1 14 15 28 9 16 1 8 ...

Page 180: ...1 Q14 L15 L13 L14 1 208 RESET VIDEO AMON STG 157 156 105 Q4 R39 IC9 IC6 14 1 7 8 IC8 1 1 4 4 5 8 5 8 R101 Q3 104 53 52 X1 L9 L8 L12 R72 R1 R71 R68 R69 R75 1 16 17 R70 R67 C69 R66 C75 L3 L6 L7 L4 L10 L11 1 9 2 10 1 2 5 6 CN7 IC7 CN4 1 11 Q8 C12 L17 C6 C15 C18 C20 1 C40 C27 C39 C47 C49 C24 R4 R6 R7 R93 R95 R96 R97 R110 R107 R106 R105 R108 R35 R28 C45 C56 R46 R57 R58 R60 R44 R56 C57 C85 C83 C82 C63 C...

Page 181: ...5 C71 1 32 Q13 1 1 11 1 1 11 6 8 5 4 C76 C77 D2 C21 16 17 C10 C88 TP6 PFUP1147Z C13 C14 C1 C2 C8 C3 C17 C87 C86 C41 C38 R27 R37 R25 R24 R88 R87 R31 R33 R42 R59 C64 R43 R52 R54 R51 R50 R49 C59 C58 Q6 R9 C25 C80 C52 R32 C43 C46 C48 C26 TP9 TP8 TP7 C31 C89 C29 C30 C37 C35 J5 1 8 L2 J9 R79 L5 L18 R98 R81 R36 R12 R19 D7 1 16 R80 R2 R86 R85 J2 J3 1 10 C90 IC3 IC5 J8 D1 1 14 15 28 9 16 1 8 B ...

Page 182: ...1 Q14 L15 L13 L14 1 208 RESET VIDEO AMON STG 157 156 105 Q4 R39 IC9 IC6 14 1 7 8 IC8 1 1 4 4 5 8 5 8 R101 Q3 104 53 52 X1 L9 L8 L12 R72 R1 R71 R68 R69 R75 1 16 17 R70 R67 C69 R66 C75 L3 L6 L7 L4 L10 L11 1 9 2 10 1 2 5 6 CN7 IC7 CN4 1 11 Q8 C12 L17 C6 C15 C18 C20 1 C40 C27 C39 C47 C49 C24 R4 R6 R7 R93 R95 R96 R97 R110 R107 R106 R105 R108 R35 R28 C45 C56 R46 R57 R58 R60 R44 R56 C57 C85 C83 C82 C63 C...

Page 183: ...D C B A H SCHEMATIC DIAGRAM DIGITAL CIRCUIT CIS LED ARRAY ON 3 3V T5 3 3V 0V T4 T3 T2 OFF 0V MOTOR ON 3 3V OFF 0V PRINTING LATCH STB1 THERMAL HEAD TEMP STB2 DATA CLOCK 5V 0V 5V 0V 5V 0V 23 24V PRINTING 3 3V WATCH DOG ERROR 5V NORMAL 5V 0V WATCH DOG ERROR OCCUR ...

Page 184: ...2 3 4 5 6 7 8 9 10 11 12 G F E D C B A H SCHEMATIC DIAGRAM ANALOG CIRCUIT FAX RX TEL TALK 2V FAX RX HANDSET TX NO PAPER 5V PAPER 0V ON HOOK 5V OFF HOOK 0V FAX TX FAX RX 12V 2V 2 1V 0V 3 3V LINE ON OFF DIALPULSE BELL DETECT 5V 0V ...

Page 185: ...RCUIT BOARD ANALOG BOARD R14 CN3 J3 J4 J1 J2 C31 CN2 R22 C8 C11 PC1 PC2 D8 D9 D7 D6 T1 RLY1 T2 D1 D2 R37 R32 R43 R42 C35 POS1 SA2 SW2 J18 J19 J20 J21 SW1 2 1 C6 PFUP1148Z C22 C15 C17 C33 C26 D5 D4 PCB CH J11 J12 J13 J14 CN1 16 1 J10 J17 J16 J9 J15 AUTO CH J5 CN5 CN4 J6 R36 C20 C38 R24 J8 J7 SA2 ...

Page 186: ... PFUP1148Z L9 L8 C39 C37 L5 L6 PC2 PC1 1 4 1 4 R5 C3 Q3 C13 R38 R31 R4 R10 R9 C4 C2 R2 C16 R1 R3 C1 1 16 24V 5VD 5VA DG AG R21 R25 R29 R34 R35 R30 R15 C24 Q2 C34 C30 IC1 5 8 4 1 R33 R23 R28 C41 R18 C32 C19 L4 L3 L2 L1 C40 C21 R19 R39 R27 R26 C18 R16 R13 C25 C29 C14 C36 C9 R7 R12 R8 C10 R11 C5 C7 R41 R6 R40 IC2 1 4 8 5 CN3 ...

Page 187: ... ZNR101 ZNR102 Q103 Q102 B E E B F101 C101 D104 D103 C103 C104 C106 R102 R103 R107 Q101 D202 R205 J6 J3 J5 IC202 D201 C202 C205 C204 J10 J9 J4 J11 J2 C201 CN301 1 8 C203 C105 C107 C109 D105 D102 J1 D101 D106 D205 D204 D107 CN31 N L SRF912UC PRIMARY SECONDARY C102 S D G Q201 E B C SRF912UC MITSUMI ELEC CO LTD 68 4492A KPC 7694V 0 94V 0 AC125V 5A F101 CN31 R112 R105 G D S R104 PC101 T101 R221 R222 J...

Page 188: ...101 22 C109 0 01 R223 100 C205 1 50 CN301 1 2 3 4 5 6 7 8 24V 24V 24V GND GND GND 5V GND C202 D201 T101 TRANS 1000p R105 G D S Q101 10 R109 D105 5 1K C103 L101 R113 R112 R111 330K 330K 330K C101 0 1 GND F101 5A125V CN31 1 2 L N C104 2200p 2200p C105 220pF C106 R102 220K R103 220K C107 330p R101 5 6 2 680 2 R205 C201 D204 470 35 680 2 R206 C207 47 35 C203 470 16 R104 15K R222 4 7K R221 680 R221 2 2...

Page 189: ...J38 J21 J20 J30 J46 J1 J9 J8 J28 J45 J25 J26 J27 J36 J44 J47 CN1 CN1 1 11 10 2 1 2 5 6 J40 J23 J39 J10 C9 C2 D1 J31 J43 J5 PS2 J17 SW1 SW9 SW23 J7 CN3 1 14 SW4 PS1 J24 SW16 SW11 SW26 SW19 SW20 SW5 SW12 SW27 SW30 SW8 SW15 AUTO CH PCB CH PFUP1146Z R14 R18 R16 R15 R2 R3 R4 R11 R10 R27 R6 R1 R9 R8 R12 Q2 R19 R17 R30 R28 R31 R32 R33 R34 R7 C6 C7 C8 R29 R5 C1 C5 C3 C4 Q3 R20 Q1 J18 J4 R13 IC1 8 9 16 1 B...

Page 190: ...1LA KX FT21LA 1 2 3 4 5 6 7 8 9 10 11 12 G F E D C B A H SCHEMATIC DIAGRAM OPERATION CIRCUIT OV 3 3V 5V 5V 0V 5V 0V 5V 0V PAPER 5V Document sensor sensor NO PAPER 0V Read position 5V 0V SENSOR SCAN 5V KEY SCAN 0V ...

Page 191: ...e MA7200 PFVD1N4005 PFVDD1NL20U PFWIFT21LA PQVIMC34119M PQVINJM4558M PQVTDTC143E PQVTDTC114EU 2SC4155R 2SC4155S 8 1 5 4 Cathode Anode Cathode Anode 14 1 15 28 1 2 3 C E B MA165 Cathode Anode Anode Cathode MA4030 PFVDRMRLS245 MA4075M Cathode Anode 1 4 8 5 1 4 8 5 PFVIT7E05 1 3 2 4 PFVIXCN4202N 1 8 16 9 PFVITC35133F 1 8 16 9 PFVIBA10358F E C B 2SC1740S B C E Cathode Anode MA2300 1 7 14 8 PQVICM4051B...

Page 192: ...KX FT21LA 166 FIXTURES AND TOOLS EC8 EC5 EC7 EC3 EC1 EC2 EC2 EC4 EC6 ...

Page 193: ... 167 KX FT21LA 2 7 1 18 19 25 3 8 9 27 10 13 16 16 22 21 23 15 11 12 28 14 4 5 PCB3 6 24 17 20 A A A A 26 1 OPERATION PANEL SECTION CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION ...

Page 194: ...KX FT21LA 168 2 UPPER CABINET SECTION 50 52 56 65 66 51 55 53 72 70 71 74 76 66 67 71 68 78 57 62 57 58 61 79 80 61 61 61 63 59 60 54 64 69 73 77 75 ...

Page 195: ... 169 KX FT21LA 3 LOWER CABINET P C B SECTION 107 101 PCB2 101 108 PCB4 103 106 PCB1 102 105 109 100 104 Refer to A A A A A A A C C C A A A B ...

Page 196: ...T21LA 170 131 137 134 132 134 134 135 136 135 136 130 139 140 132 136 133 132 138 142 141 143 4 MOTOR SECTION Note Make sure that Gears 1 2 and 3 are installed face up The product number is put on the face ...

Page 197: ... 171 KX FT21LA B A C XSB4 6 XTW3 S10P XSN3 W6FZ Part No Illustration 5 ACTUAL SIZE OF SCREWS AND WASHER ...

Page 198: ...KX FT21LA 172 A6 P2 A7 P3 A4 A1 P4 P5 P1 A5 A3 A2 ACCESSORIES AND PACKING MATERIALS ...

Page 199: ...1503Z CAUTION LABEL 1 61 PFUS1172Y SPRING THERMAL HEAD 4 ECFD Semi Conductor ECCD ECKD PQCBC PQVP Ceramic 62 PFDE1102Z1 LEVER LOCK S 1 ECQS Sty rol ECQM ECQV ECQE ECQU ECQB Poly ester 63 PFJS02Q42Z CONNECTOR 2PIN 1 PQCBX ECUV Chip ECEA ECSZ ECOS Electroly tic 64 PFAS50P003Z SPEAKER 1 ECMS Mica ECQP Poly propy lene 65 PFUS1179Z SPRING LOCK LEVER 1 Voltage 66 PFHE1019Z IMASEN FORM 2 ECQ Ty pe ECQG E...

Page 200: ...55R TRANSISTOR SI 1 ACCESSORIES AND PACKING MATERIALS Q4 2SC4155R TRANSISTOR SI 1 Q6 PQVTDTC114EU TRANSISTOR SI or UN5211T 1 A1 PFJXE0801Z HANDSET 1 Q7 2SB1322 TRANSISTOR SI S 1 A2 PFJA1029Y CURL CORD 1 Q8 PQVTDTC114EU TRANSISTOR SI or UN5211T 1 A3 PQJA10075Z TEL CORD 1 A4 PFUS1167Z STACKER 1 Q10 2SC4155R TRANSISTOR SI 1 A5 PFJA1030Z POWER CORD 1 Q11 2SC4155R TRANSISTOR SI 1 A6 PFQX1289Z INSTRUCTI...

Page 201: ...8 9 ERJ3GEY0R00 0 1 R75 ERJ3GEYJ472 4 7K 1 R77 ERJ3GEYJ472 4 7K 1 L10 15 ERJ3GEY0R00 0 7 R78 ERJ3GEYJ102 1K 1 L17 R79 ERJ3GEY0R00 0 1 R1 ERJ3GEYJ473 47K 1 R80 ERJ3GEYJ151 150 1 R2 ERJ3GEY0R00 0 1 R81 ERJ3GEYJ470 47 1 R6 ERJ3GEY0R00 0 1 R82 ERJ3GEYJ6R8 6 8 1 R7 ERJ3GEYJ103 10K 1 R87 ERJ3GEYJ224 220K 1 R8 ERJ3GEYJ472 4 7K 1 R88 ERJ3GEYJ224 220K 1 R9 ERJ3GEYJ472 4 7K 1 R89 ERJ3GEYJ103 10K 1 R10 ERJ3G...

Page 202: ...0 10 S 1 JACK C41 ECUV1H104ZFV 0 1 S 1 C42 ECUV1H102KBV 0 001 1 CN3 PQJJ1TB18Z JACK S 1 C43 ECUV1C104KBV 0 1 1 CN4 PQJJ1T004Z JACK S 1 C44 ECUV1H150JCV 15P 1 CN5 PQJJ1T004Z JACK S 1 C45 ECUV1C104KBV 0 1 1 C46 ECUV1H104ZFV 0 1 S 1 C47 ECUV1H220JCV 22P 1 C48 ECUV1C104KBV 0 1 1 CONNECTORS C49 ECUV1H220JCV 22P 1 CN1 PQJS16A10Z CONNECTOR 16PIN 1 C50 ECUV1H222KBV 0 0022 1 CN2 PQJP02G100Z CONNECTOR 2PIN ...

Page 203: ...6 2K 1 C33 ECEA1CKS470 47 S 1 R11 ERJ3GEYJ563 56K 1 C34 ECUV1H103KBV 0 01 1 R12 ERJ3GEYJ123 12K 1 C35 ECQE2E105KZ 1 S 1 R13 ERJ3GEYJ563 56K 1 C36 ECUV1C273KBV 0 027 1 R14 ERDS2TJ471 470 1 R15 ERJ3GEYJ153 15K 1 R16 ERJ3GEYJ394 390K 1 OPERATION BOARD PARTS R18 ERJ3GEYJ103 10K 1 R19 ERJ3GEYJ224 220K 1 PCB3 PFLP1196BXZ OPERATION BOARD ASS Y RTL 1 R21 ERJ3GEYJ223 22K 1 R23 ERJ3GEYJ154 150K 1 IC R24 ERG...

Page 204: ...CONNECTOR 8PIN 1 COILS SWITCHES L101 PFLES11V0712 COIL S 1 SW1 EVQ11Y05B SPECIAL SWITCH 1 SW2 EVQ11Y05B SPECIAL SWITCH 1 SW3 EVQ11Y05B SPECIAL SWITCH 1 VARISTORS SW5 EVQ11Y05B SPECIAL SWITCH 1 SW6 EVQ11Y05B SPECIAL SWITCH 1 ZNR101 ERZV10DK471U VARISTOR 1 SW7 EVQ11Y05B SPECIAL SWITCH 1 ZNR102 ERZV10DK471U VARISTOR 1 SW8 EVQ11Y05B SPECIAL SWITCH 1 SW10 EVQ11Y05B SPECIAL SWITCH 1 PHOTO COUPLER SW11 E...

Page 205: ... 001 1 C203 PFCEA16A470 47P S 1 C205 PFCEA50A1M 1 S 1 C207 PFCEA35A47M 47 S 1 OTHERS F101 PQBA1C50NBKL FUSE S 1 IC202 PFVITA7805F IC S 1 T101 ETS29AK415AC TRANSFORMER 1 VR201 EVNDJAA03B53 VARIABLE RESISTOR 1 FIXTURES AND TOOLS EC1 PQZZ6K7Z CONNECTOR 6P 1 EC2 PQZZ2K6Z CONNECTOR 2P 1 EC3 PFZZ5K13Z CONNECTOR 5P 1 EC4 PQZZ2K6Z CONNECTOR 2P 1 EC5 PFZZ12K1Z CONNECTOR 12P 1 EC6 PQZZ12K4Z CONNECTOR 12P 1 ...

Page 206: ...KX FT21LA 180 D Q KXFT21LA Printed in Japan ...

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