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Panasonic KX-FT901CX-B, Service Manual

The Panasonic KX-FT901CX-B is a versatile fax machine that offers a wealth of features for efficient communication. To ensure optimal use, users can easily access the user manual through our website, manualshive.com, where they can download the service manual for free.

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8.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUITS

 1. Circuit Operation

The reception signal received as output from line transformer T1 is given as input to C17, R13, C11, R16, IC3(6-7) and IC3(2).
Then it is input to the reception system at an amplifier gain of 2.5 dB from pin (2).
The transmission signal is input from CN1 pin (5), and output to the TEL line through C29, R29, R28 and T1. Without a side
tone circuit, the transmission signal would return to the reception amplifier via C29 and R28. Here, the signal output from CN1
pin (5) passes through C29, R24 and R23, and enters the amplifier IC3 pin (3). This is used to cancel the return portion of the
transmission signal. This is the side tone circuit.

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KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S

Summary of Contents for KX-FT901CX-B

Page 1: ...onal Facsimile IMPORTANT INFORMATION ABOUT LEAD FREE PbF SOLDERING If lead free solder was used in the manufacture of this product the printed circuit boards will be marked PbF Standard leaded Pb solder can be used as usual on boards without the PbF mark When this mark does appear please read and follow the special instructions described in this manual on the use of PbF and how it might be permiss...

Page 2: ...D LISTS 42 7 4 TEST FUNCTIONS 45 7 5 TROUBLESHOOTING DETAILS 54 8 CIRCUIT OPERATIONS 103 8 1 CONNECTION DIAGRAM 103 8 2 GENERAL BLOCK DIAGRAM 104 8 3 CONTROL SECTION 106 8 4 FACSIMILE SECTION 113 8 5 SENSORS AND SWITCHES 123 8 6 MODEM SECTION 127 8 7 ANALOG UNIT BLOCK DIAGRAM 134 8 8 NCU SECTION 135 8 9 ITS INTEGRATED TELEPHONE SYSTEM AND MONITOR SECTION 137 8 10 ATAS AUTOMATIC TELEPHONE ANSWERING...

Page 3: ...long PbF solder will tend to splash if it is heated much higher than its melting point approximately 1100 F 600 C If you must use Pb solder on a PCB manufactured using PbF solder remove as much of the original PbF solder as possible and be sure that any remaining is melted prior to applying the Pb solder When applying PbF solder to double layered boards please check the component side for excess w...

Page 4: ...SOLDER IS USED P C Boards marked as PbF use Pb Free solder See the figure below Pb Free is not used the Power Supply Board of this unit Example Digital Board 4 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 5: ...rts may be isolated from the chassis by design These will read infinity 4 If the measurement is outside the specified limits there is a possibility of a shock hazard 1 4 FOR SERVICE TECHNICIANS ICs and LSIs are vulnerable to static electricity When repairing the following precautions will help prevent recurring malfunctions 1 Cover the plastic part s boxes with aluminum foil 2 Ground the soldering...

Page 6: ...IONS 1 7 1 MOVING SECTIONS OF THE UNIT Be careful not to let your hair clothes fingers accessories etc become caught in any moving sections of the unit The moving sections of the unit are the rollers and a gear There is a separation roller and a document feed roller which are rotated by the document feed motor A gear rotates the two rollers Be careful not to touch them with your hands especially w...

Page 7: ... disassembling for service 1 8 SERVICE PRECAUTIONS 1 8 1 PRECAUTIONS TO PREVENT DAMAGE FROM STATIC ELECTRICITY Electrical charges accumulate on a person For instance clothes rubbing together can damage electric elements or change their electrical characteristics In order to prevent static electricity touch a metallic part that is grounded to release the static electricity Never touch the electrica...

Page 8: ...iew LCD 15 Characters Broadcast up to 10 Stations Integrated telephone system One touch dial 22 items Navigator directory 100 items 2 2 OPTIONAL ACCESSORIES Model No Description Specifications KX A106 Standard thermal recording paper 216 mm 30 m roll with 25 mm core Note Only use the included specified recording paper or else the print quality may be affected and or excessive thermal head wear may...

Page 9: ...tion Standby Approx 3 0 W Transmission Approx 25 W Reception Approx 40 W When receiving a 20 black document Copy Approx 40 W When copying a 20 black document Maximum Approx 125 W When receiving a 100 black document Power Supply 220 240 V AC 50 60 Hz Fax Memory Capacity KX FT903CX B W S ONLY Approx 20 pages of document memory Based on the ITU T No 1 Test Chart in standard resolution 1 Transmission ...

Page 10: ... in all illustrations in this operating instructions 5 Document exit 6 Microphone 7 Document entrance 8 Cover open button Note Remove all the blue shipping tapes before installation 3 INSTALLATION 3 1 LOCATION OF CONTROLS 3 1 1 FRONT VIEW 10 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 11: ...will automatically redial the number up to 2 times To insert a pause during dialling 14 MUTE To mute your voice to the other party during a conversation Press this button again to resume the conversation 15 MONITOR To initiate dialling without lifting the handset 16 MENU To initiate or exit programming 17 NAVIGATOR VOLUME To adjust volume To search for a stored item To select features or feature s...

Page 12: ...t and easily accessible Be sure to use the telephone line cord included in this unit Do not extend the telephone line cord Note To avoid malfunction do not position fax machine near appliance such as TVs or speakers which generate an intense magnetic field If any other device is connected on the same line this unit may disturb the network condition of the device 12 KX FT901CX B KX FT903CX B KX FT9...

Page 13: ...rd length should be less than 5 meters Using a longer cord may reduce the voltage or cause malfunctions Avoid direct sunlight Do not install near devices which contain magnets or generate magnetic fields Do not subject the unit to strong physical shock or vibration Keep the unit clean Dust accumulation can prevent the unit from functioning properly To protect the unit from damage hold both sides w...

Page 14: ...e excess paper by pulling it towards you 6 KX FT903CX Press FAX START to cut the paper Note If the paper is secured with glue or tape cut approximately 15 cm from the beginning of the roll before installing it When the power cord is connected a message is printed each time the cover is opened then closed If the recording paper is installed upside down the massage will not be printed Install the pa...

Page 15: ... torn paper Paper with a coated surface Paper with a faint image Paper with printing on the opposite side that can be seen through the other side i e newspaper Check that ink paste or correction fluid has dried completely To transmit the document with a width of less than standard A4 size 210 mm we recommend using a copy machine to copy the original document onto A4 or letter sized paper than tran...

Page 16: ...or to move the cursor to the character you want to delete and press STOP 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 MUTE to insert a space and enter the character 4 Press SET The underbar shows a position of the cursor 5 Enter your logo up to 30 characters See the character table on page 15 for details 6 Press ...

Page 17: ...ercase letters b Number c Symbol d Lowercase letters If you press the order will be reversed 2 Press to insert the character The character displayed in step 1 is inserted 3 Return to step 1 to enter the next character 3 3 5 1 TO SELECT CHARACTERS WITH THE DIAL KEYPAD Pressing the dial keys will select a character as shown below 17 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX...

Page 18: ... if the problem originates from the transmitter receiver or the telephone line 4 Determine causes Determine the causes of the 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...

Page 19: ...e glass is dirty clean with a dry soft cloth Refer to DOCUMENT FEEDER P 21 7 Abnormal wear and tear or loose parts Replace the part Check if the screws are tight on all parts 4 1 2 2 MAINTENANCE CYCLE No Item Cleaning Cycle Replacement Cycle Procedure 1 Separation Roller Ref No 141 3 months 7 years 10 000 documents Refer to HOW TO REMOVE THE MOTOR BLOCK P 35 2 Separation Rubber Ref No 11 3 months ...

Page 20: ... Remove the recording paper 4 Cut off the wrinkled portion 5 Install the recording paper and close the cover securely by pushing down on both sides 4 2 JAMS 4 2 1 RECORDING PAPER JAMS When the recording paper has jammed in the unit The display will show the following 20 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 21: ...ocument when transmitting or copying 1 Disconnect the power cord and the telephone line cord 2 Open the cover by pressing the cover open button 3 Clean the document feeder rollers and rubber flap with a cloth moistened with isopropyl rubbing alcohol and let all parts dry thoroughly Clean the white plate and scanner glass with a soft and dry cloth Caution Do not use paper products such as paper tow...

Page 22: ...ve the recording paper 3 Clean the thermal head and head cover with a cloth moistened with isopropyl rubbing alcohol and let all parts dry thoroughly Caution To prevent a malfunction due to static electricity do not use a dry cloth and do not touch the thermal head directly 4 Connect the power cord and the telephone line cord 5 Install the recording paper and close the cover securely by pushing do...

Page 23: ...KX FT903 ONLY P 25 A 2 HOW TO REMOVE THE OPERATION PANEL BLOCK P 26 A 3 HOW TO REMOVE THE OPERATION BOARD AND LCD P 27 A 4 HOW TO REMOVE THE IMAGE SENSOR P 28 A 5 HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT P 29 A 6 HOW TO REMOVE THE DOCUMENT TRAY P 30 23 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 24: ...CK P 26 B 1 HOW TO REMOVE THE BOTTOM FRAME P 31 B 2 HOW TO REMOVE THE HANDSET CRADLE CABINET AND SPEAKER P 32 B 3 HOW TO REMOVE THE DIGITAL ANALOG AND POWER SUPPLY BOARD AND AC INLET P 33 B 4 HOW TO REMOVE THE ROLLERS P 34 B 5 HOW TO REMOVE THE MOTOR BLOCK P 35 24 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 25: ...6 DISASSEMBLY INSTRUCTIONS 6 1 HOW TO REMOVE THE PAPER STACKER KX FT903 ONLY 25 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 26: ...6 2 HOW TO REMOVE THE OPERATION PANEL BLOCK 26 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 27: ...6 3 HOW TO REMOVE THE OPERATION BOARD AND LCD 27 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 28: ...6 4 HOW TO REMOVE THE IMAGE SENSOR 28 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 29: ...6 5 HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT 29 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 30: ...6 6 HOW TO REMOVE THE DOCUMENT TRAY 30 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 31: ...6 7 HOW TO REMOVE THE BOTTOM FRAME 31 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 32: ...6 8 HOW TO REMOVE THE HANDSET CRADLE CABINET AND SPEAKER 32 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 33: ...6 9 HOW TO REMOVE THE DIGITAL ANALOG AND POWER SUPPLY BOARD AND AC INLET 33 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 34: ...6 10 HOW TO REMOVE THE ROLLERS 34 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 35: ...6 11 HOW TO REMOVE THE MOTOR BLOCK 35 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 36: ...CROSS REFERENCE HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT P 29 36 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 37: ...37 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 38: ...6 12 INSTALLATION POSITION OF THE LEAD WIRES 38 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 39: ...6 13 INSTALLATION OF THERMAL HEAD AND ANALOG BOARD 39 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 40: ...g 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 shocks and short circuits 4 After troubleshooting double check that you have not forgotten any connectors l...

Page 41: ...There is no space to store new items in navigator directory Erase unnecessary items The unit has a document in memory See the other displayed message instructions to print out the document When making a copy the document being stored exceeds the memory capacity of the unit Press STOP to clear the message Divide the document into sections The other partyís fax machine is busy or has run out of reco...

Page 42: ...e listed in the Operating Instructions and are available to the user The special programs are only those listed here and not displayed to the user In both the User and Service Modes there are Set Functions and Test Functions The Set Functions are used to program various features and functions and the Test Functions are used to test the various functions The Set Functions are accessed by entering t...

Page 43: ...test 1 ON 2 OFF 1 2 2 Press START COPY SET 553 Setting the FAX monitor function 1 OFF 2 PHASE B 3 ALL 1 2 3 1 Sets whether to monitor the line signal with the unit s speaker during FAX communication or not 554 Modem test Press START COPY SET 555 Scanner test Press START COPY SET 556 Motor test Press START COPY SET 557 LED test Press START COPY SET 558 LCD test Press START COPY SET 559 Setting the ...

Page 44: ...0BPS 1 4 1 Adjusts the speed to start training during FAX transmission 718 Receive speed select 1 9600BPS 2 7200BPS 3 4800BPS 4 2400BPS 1 4 1 Adjusts the speed to start training during FAX reception 719 Ringer off in TEL FAX mode 1 ON 2 OFF 1 2 1 Sets the ringer switch off when a call is received in the TEL FAX mode 721 Pause tone detect 1 ON 2 OFF 1 2 1 Selects the tone detection for pauses in di...

Page 45: ...ystems Refer to READ SECTION P 100 START LCD CHECK Service Mode 5 5 8 Check the LCD indication Illuminates all the dots to check if they are normal Refer to OPERATION PANEL SECTION P 150 START DTMF SINGLE TEST Service Mode 5 5 2 Outputs the DTMF as single tones Used to check the frequencies of the individual DTMF tones Refer to DTMF SINGLE TONE TRANSMIT SELECTION P 46 1 ON 2 OFF KEY CHECK Service ...

Page 46: ...F signal will not work 7 4 2 BUTTON CODE TABLE Code Button Name Code Button Name Code Button Name 03 AUTO ANSWER 32 2 01 STOP 04 FAX START 33 3 5A STATION 1 05 MENU 34 4 5B STATION 2 07 HELP 35 5 5C STATION 3 08 MONITOR 36 6 5D STATION 4 09 COPY 37 7 5E STATION 5 0A MUTE 38 8 5F STATION 6 0B PREV 39 9 60 STATION 7 0C NEXT 3A 0 61 STATION 8 0D VOLUME 3B 62 STATION 9 0E VOLUME 3C 63 STATION 10 1C SE...

Page 47: ... can be changed The procedure for changing and listing parameters is described on ENTERING THE REMOTE PROGRAMMING MODE AND CHANGING SERVICE CODES P 47 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 connected telephone is in use during the remote programming mode it may be helpful to ask th...

Page 48: ...2km 0km OK 524 Transmission equalizer select 1 0km 2 1 8km 3 3 6km 4 7 2km 0km OK 544 Document feed position adjustment value set 01 99 step 50 OK 550 Memory clear Press START NG 551 ROM check Press START NG 552 DTMFsignal tone test 1 ON 2 OFF OFF NG 553 Monitor on FAX communication select 1 OFF 2 P B 3 ALL OFF OK 554 Modem test Press START NG 555 Scanner test Press START NG 556 Motor test Press S...

Page 49: ... Transmit basic list 1 START OK 992 Transmit advanced list 1 START OK 994 Transmit journal report 1 START OK 999 Transmit service list 1 START OK OK Can set the value by the remote programming feature or print a list NG Cannot set the value Note Note Refer to SERVICE FUNCTION TABLE P 43 for descriptions of the individual codes For example the 004 Transmission report mode set value 1 ERROR 2 ON 3 O...

Page 50: ... list below is an example of the SYSTEM SETUP LIST the unit prints out 7 4 5 1 KX FT901CX B W S Note The above values are the default values 50 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 51: ...7 4 5 2 KX FT903CX B W S Note The above values are the default values 51 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 52: ...7 4 6 SERVICE MODE SETTINGS Example of a printed out list 7 4 6 1 KX FT901CX B W S 52 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 53: ...7 4 6 2 KX FT903CX B W S 53 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 54: ...ic block or area for example the Digital Board or Image Sensor A variety of fault descriptions from customers often point to the same area and for this reason careful analysis of the reported symptoms is required After every repair test all functions to ensure no problems are evident 7 5 2 STARTING TROUBLESHOOTING Select the appropriate troubleshooting method according to the symptoms CROSS REFERE...

Page 55: ...ELEPHONE SYSTEM SECTION P 95 Error code is displayed See HOW TO OUTPUT THE JOURNAL REPORT P 71 Cannot talk See ANALOG BOARD SECTION P 93 DTMF tone doesn t work Handset Monitor sound volume 7 5 3 1 SIMPLE CHECK LIST SERIAL NO DATE FUNCTION JUDGEMENT REFERENCE FAX operation Transmission OK NG Receiving OK NG Copy operation FINE mode OK NG PHOTO mode OK NG Telephone operation Handset transceiver rece...

Page 56: ...1 NO DOCUMENT FEED CROSS REFERENCE DIGITAL BOARD SECTION P 82 POWER SUPPLY BOARD SECTION P 96 SENSOR SECTION P 100 TEST FUNCTIONS P 45 DISASSEMBLY INSTRUCTIONS P 25 56 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 57: ...7 5 4 2 DOCUMENT JAM CROSS REFERENCE SENSOR SECTION P 100 DISASSEMBLY INSTRUCTIONS P 25 57 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 58: ...5 4 3 MULTIPLE FEED When using thick paper etc If the document will not feed CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 25 58 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 59: ...7 5 4 4 SKEW CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 25 59 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 60: ... DISTORTED WHEN PRINTING CROSS REFERENCE READ SECTION P 100 THERMAL HEAD SECTION P 102 TEST FUNCTIONS P 45 DISASSEMBLY INSTRUCTIONS P 25 60 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 61: ...LACK OR WHITE VERTICAL LINES APPEAR CROSS REFERENCE DIGITAL BOARD SECTION P 82 TEST FUNCTIONS P 45 7 5 4 7 SKEWED RECEIVING IMAGE 61 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 62: ...RINT WHEN PRINTING CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 25 7 5 4 9 WHEN COPYING OR PRINTING AN ABNORMAL SOUND IS HEARD FROM THE UNIT 62 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 63: ... The fax receives successfully one time and fails another Copying is possible Troubleshooting Problem with the service line or with the transmitter s fax 4 The fax completely fails to transmit or receive The unit can copy documents Troubleshooting Problem with the electric circuit 5 The fax fails either to transmit or receive when making a long distance or an international call The unit can copy d...

Page 64: ...ECTIVE FACSIMILE SECTION 7 5 5 1 1 TRANSMIT PROBLEM CROSS REFERENCE ADF AUTO DOCUMENT FEED SECTION P 56 OPERATION BOARD SECTION P 99 64 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 65: ...7 5 5 1 2 SOMETIMES THERE IS A TRANSMIT PROBLEM 65 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 66: ...mes the below errors may be occurred OUT OF PAPER CHHECK COVER UNIT OVERHEATED If it doesn t return automatically COVER OPEN etc reset the unit CHECK DOCUMENT Please refer to USER RECOVERABLE ERRORS P 41 for the above items Also when a hardware deformity occurs please check each sensor 66 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 67: ...7 5 5 1 4 THE UNIT CAN COPY BUT CANNOT TRANSMIT RECEIVE 67 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 68: ...els with a START button the other party should be called manually if possible Another possibility is entering two pauses at the end of the auto dial number on the transmission side Then the count start time will be delayed for 2 pauses about 10 sec Cause 2 Erroneous detection due to an echo or echo canceler Echo Echo Canceler The signal from FAX1 reaches FAX2 via the stations 1 and 2 but the refle...

Page 69: ...ignal and DIS signal to 500 msec This will give at least 250 msec to recover the echo canceler operation Refer to Fig c Service code 593 Time between CED and 300 bps Sending side The sending side FAX sends a DCS signal not after receiving the 1st DIS signal but after receiving the 2nd DIS signal Refer to Fig d Service code 594 Overseas DIS detection select 3 Sending side Communication failure occu...

Page 70: ...RECT Long distance or international communication operation This symptom highly depends on the transmission and reception capability of the other FAX unit and the line conditions The countermeasures for this unit are shown below Transmission Operation Set the transmitting speed to 4800BPS service mode code No 717 or select the overseas mode Reception Operation If 80 or more of the reception is inc...

Page 71: ...COMMUNICATION ERROR SND No post message 6 49 COMMUNICATION ERROR SND RTN is transmitted 7 50 COMMUNICATION ERROR SND PIN is transmitted to PRI Q 8 51 COMMUNICATION ERROR SND PIN is transmitted 8 52 COMMUNICATION ERROR SND Reception is finished when the T1 TIMER expires 8 53 ERROR NOT YOUR UNIT RCV DCN is received after transmission of NSC and DTC 9 54 ERROR NOT YOUR UNIT RCV DCN is received after ...

Page 72: ...Countermeasure 72 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 73: ...73 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 74: ...74 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 75: ...75 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 76: ...76 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 77: ...77 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 78: ...78 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 79: ...79 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 80: ...cial journals giving the additional detailed information about the latest 35 communications can be printed by Service Code 882 Remote printing function for the journal reports JOURNAL and JOURNAL 3 is also available for service technicians Refer to REMOTE PROGRAMMING P 47 The JOURNAL report only gives you basic information about a communication but the JOURNAL 3 report provide different informatio...

Page 81: ...MF Remote Fax activation code entered remotely 5 PAL DTMF Means the unit detected DTMF Remote Fax activation code entered by a parallel connected telephone 6 TURN ON Means the unit started to receive after 15 rings Remote Turn On Service Code 573 7 TIME OUT Means the unit started to receive after Ring Time Out in the EXT TAM or TEL FAX mode 8 IDENT Means the unit detected Ring Detection 9 TEL FAX ...

Page 82: ...e common particularly for an ASIC and RA Resistor Array But if you have an oscilloscope you can easily determine the problem site or IC malfunction by checking the main signal lines Even if you don t have such a measuring instrument by checking each main signal line and resoldering it in many cases the problem will be resolved An explanation of the main signals for booting up the unit is below Wha...

Page 83: ...to boot up are listed here List 1 For signal lines other than these even if they malfunction they do not directly affect booting up the system 7 5 8 1 DIGITAL BLOCK DIAGRAM 83 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 84: ...84 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 85: ...s even slightly delayed the circuit will not work Nor will it if the IC is defective and the output voltage level is not normal although the timing of these signals is accurate enough to meet the specifications Make sure that your oscilloscope is calibrated before starting a test Therefore it is imperative to confirm whether each IC outputs the signal at the correct level See the I O Pin No Diagra...

Page 86: ...ly check the output level and make sure if the IC repeatedly outputs the signal at between 3 3V H and 0V L I O and Pin No Diagram 86 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 87: ...87 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 88: ...s each IC The ROM SRAM and Modem are checked If initialization fails for the ICs the system will not boot up CROSS REFERENCE NG EXAMPLE P 90 CHECK THE STATUS OF THE DIGITAL BOARD P 91 88 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 89: ...5 8 2 FLASH MEMORY IC6 If the unit is working correctly but the TAM fanction can not work you should check the Flash Memory 89 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 90: ...7 5 8 3 NG EXAMPLE 90 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 91: ...5 8 4 CHECK THE STATUS OF THE DIGITAL BOARD First please check voltages and oscillation whether they are correct as follows 91 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 92: ...92 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 93: ...e line In this route it is mainly an analog signal Tracing the signal can be done easily using an oscilloscope Each route is shown on the CHECK SHEET P 93 here If there is a problem with the unit for example you cannot communicate with the H S etc trace the signal in the area and determine the cause 7 5 9 1 CHECK SHEET Note Inside the digital board Inside the operation board 93 KX FT901CX B KX FT9...

Page 94: ...Note Inside the digital board Inside the operation board 94 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 95: ...7 5 9 2 DEFECTIVE ITS INTEGRATED TELEPHONE SYSTEM SECTION 95 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 96: ...tional short circuit test etc Caution If you find a melted fuse in the unit do not turn on the power until you locate and repair the faulty parts except for the fuse otherwise the fuse will melt 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 s...

Page 97: ...2 Troubleshooting Flow Chart 97 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 98: ...etween 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 R128 R109 D106 and IC101 You should change all of the parts listed as follows F101 Q101 R128 R109 D106 IC101 D201 If D201 is broken the oscillation circuit in the power supply cannot operate Check it with an electric tester 98 KX FT901C...

Page 99: ...BOARD SECTION 7 5 11 1 NO KEY OPERATION CROSS REFERENCE TEST FUNCTIONS P 45 7 5 11 2 NO LCD INDICATION CROSS REFERENCE TEST FUNCTIONS P 45 99 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 100: ...he circuit descriptions 7 5 12 1 CHECK THE DOCUMENT SENSOR PS1 CHECK DOCUMENT 7 5 12 2 CHECK THE READ POSITION SW44 REMOVE DOCUMENT 7 5 13 READ SECTION Refer to SCANNING BLOCK P 117 100 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 101: ...CROSS REFERENCE TEST FUNCTIONS P 45 101 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 102: ...HEAD SECTION Refer to THERMAL HEAD P 115 CROSS REFERENCE SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE P 112 THERMAL HEAD P 115 102 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 103: ...8 CIRCUIT OPERATIONS 8 1 CONNECTION DIAGRAM 103 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 104: ...tions 3 Static RAM IC4 This memory is used mainly for the parameter working storage area 4 MODEM IC5 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 8 Analog board Composed of an ITS circuit and NCU circuit 9 Sensor Section Composed of a document senso...

Page 105: ...8 2 1 GENERAL BLOCK DIAGRAM 105 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 106: ...E ASIC IC1 VOL A D IMAGE PROCESSING MOTOR I F MOTOR DRIVER IC7 RESET IC3 TO MOTOR T2 T5 256kbit ROM OP PANEL I F OSC 24MHz CPU 24V 24V 5V XRESETI XWDERR D0 7 A0 17 WR RD TO CIS TO THERMAL HEAD STB1 2 3 THLAT THCLK THDAT ANALOG SW Q11 FET LED ON CLK SIG THON 32 768kHz Q7 CIS ON KX FT901 903CX B W S DIGITAL BOARD BLOCK DIAGRAM SP AMP IC12 CN9 WR RD A0 14 D0 D7 IC6 FRASH 4M bit KX FT903 ONLY 106 KX F...

Page 107: ...OWER SOURCE ANALOG GND 2 VDDA 3 3 3 3V POWER SOURCE ANALOG 3 3V 3 AIN1 A 3 3V CIS IMAGE SIGNAL INPUT SIG 4 AIN2 A 3 3V THERMISTOR TEMPERATURE WATCH INPUT 5 AIN3 A 3 3V LINE VOLTAGE DETECTION SIGNAL INPUT DCIN 6 AMON A 3 3V ANALOG SIGNAL MONITOR TERMINAL 7 VSS GND POWER SOURCE GND 8 X32OUT O 3 3V BATT RTC 32 768KHz CONNECTION 9 X32IN I 3 3V BATT RTC 32 768KHz CONNECTION 10 VDD 3 3V B POWER SOURCE 3...

Page 108: ...ED 59 TEST4 I 3 3V HIGH FIXED 60 XMDMINT I 3 3V MODEM INTERRUPT 61 XMDMCS O 3 3V MODEM CHIP SELECT 62 XRAS IOP I O 3 3V PORT SPMUTE 63 XCAS1 IOP I 3 3V INPUT PORT PAPER 64 XCAS2 IOP I 3 3V INPUT PORT PDWN 65 XRESCS2 O 3 3V FLASH CHIP SELECT XRESCS2 66 DB3 I O 3 3V CPU DATA BUS 3 67 DB2 I O 3 3V CPU DATA BUS 2 68 DB4 I O 3 3V CPU DATA BUS 4 69 DB1 I O 3 3V CPU DATA BUS 1 70 DB5 I O 3 3V CPU DATA BU...

Page 109: ...LSE OUTPUT FOR DATA LATCH XTHLAT 119 STBNP I 3 3V INPUT PORT MOT POS 120 RM0 IOP O 3 3V MOTOR A PHASE 121 RM1 IOP O 3 3V MOTOR B PHASE 122 RM2 IOP O 3 3V MOTOR A PHASE 123 RM3 IOP O 3 3V MOTOR B PHASE 124 RXE IOP O 3 3V MOTOR ENABLE 125 TMO O 3 3V OUTPUT PORT THON 126 VDD 2 5V POWER SOURCE 2 5V 127 VSS GND POWER SOURCE GND 128 TM1 IOP O 3 3V OUTPUT PORT NC 129 TM2 IOP O 3 3V OUTPUT PORT CISON 130 ...

Page 110: ...FH are for the bank area 8 3 5 RESET CIRCUIT WATCH DOG TIMER The output signal reset from pin 4 of the voltage detect IC IC3 is input to the ASIC IC1 114 pin 1 During a momentary power interruption a negative reset pulse of 50 70 msec is generated and the system is reset completely 2 The watch dog timer built in the ASIC IC1 is initialized by the CPU about every 1 5 ms When a watch dog error occur...

Page 111: ...upplied to RAM IC4 and RTC IC1 At this time the voltage at pin 32 of RAM and pin 14 of RTC IC1 is 3 3V When the power is turned OFF the battery supplies the power to RAM and RTC through J1 R48 D3 At that time the voltage at pin 32 of RAM and pin 14 of IC1 are about 2 5V When the power is OFF and the 5V and 3 3V voltages decrease IC3 detects them and LOW is input to pin 114 of IC1 Pin 111 of IC1 ou...

Page 112: ...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 width of the thermal head according to this value Therefore this circuit can keep the thermal head at an even temperature in order to stabilize the printing density and prevent th...

Page 113: ...nput 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 times mm Fine Reads 7 7 times mm Super Fine Reads 15 4 times mm Transmission 1 Same processing as COPY items 1 3 2 The data stored in RAM of IC1 is output from IC1 via routes 6 and 10 ...

Page 114: ...8 4 2 BLOCK DIAGRAM 114 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 115: ...ift registers become filled with data and a latch pulse is emitted to each IC from IC1 pin 118 THLAT With this latch pulse all the contents of the shift registers are latched to the latch registers Thereafter through the addition of strobes from the IC1 pins 103 105 only black dot locations 1 among latched data activates the driver and the current passes to heat the emitting body causing heat emis...

Page 116: ...116 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 117: ...his applies voltage to the LED array to light it and the voltage 3 3V of CIS turns on 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 The analog image signal is input to the system LSI IC1 on AIN1 pin 3 of IC1 and converted into 8 bit data by the ...

Page 118: ...zed 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 Stepping Motor Phase Pattern Function Mode Phase Pattern Speed Copy Fine Half Tone 1 2 432 pps Super Fine 1 2 216 pps FAX STD 2 432 pps Fine Half Tone 1 2 432 pps Super Fine 1 2 216 pps Paper Feed 2 432 pps When the...

Page 119: ... the Drive Motor Gear rotates counterclockwise CCW Swing Gear A engages the CAM and the CAM turns counterclockwise to select a mode See Fig A 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 CAM 119 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT9...

Page 120: ...eive 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 Roller Gear and the Platen Roller Gear for feeding documents and recording paper in the copying operation 8 4 6 3 MECHANICAL MOVEMENTS IN THE MAIN OPERATIONS 8 4 6 3 1 IDLE STATUS 120 ...

Page 121: ...8 4 6 3 2 SCANNING CROSS REFERENCE SENSOR SECTION P 100 8 4 6 3 3 PRINTING Note See 6 5 SENSERS AND SWITCHES 121 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 122: ...8 4 6 3 4 COPYING CROSS REFERENCE SENSOR SECTION P 100 122 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 123: ...ITAL CN5 Motor Position CALL SERVICE 2 CN6 Cutter Position PAPER JAMED ANALOG SW1 Cover Open and Paper set CHECK COVER and OUT OF PAPER SW2 Hook SW SW3 JAM set PAPER JAMED Operation Panel SW44 Document Read Position REMOVE DOCUMENT PS1 Document set CHECK DOCUMENT 123 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 124: ...ow level Other High level 8 5 3 RECORDING PAPER SENSOR SW1 When there is no recording paper the plate is separated from the switch lever and the switch turns off Pin 63 of IC1 becomes a high level When there is recording paper the plate pushes the switch lever and the switch turns ON Pin 63 of IC1 becomes a low level Analog Board Signal CN1 63 Pin Paper Low level No paper High level 124 KX FT901CX...

Page 125: ...JAM sensor is a detection switch for determining whether the recording paper edge is in the correct position or not If the recording paper cannot be detected correctly at the JAM sensor position even when recording paper is present then JAM is displayed If the recording paper is at the sensor position then the switch turns on the IC1 21pin switches to a high level Analog Board Signal CN1 21 Pin Pa...

Page 126: ...MENT SET SENSOR PS1 When a document is set the shelter plate closes the sensor light the photo transistor becomes OFF and the input signal of the IC1 15 pin Operation becomes a high level When there is no document the shelter plate passes the sensor light the photo transistor becomes ON and the input signal of the IC1 15 pin Operation becomes a low level When checking this sensor the IC1 41 pin be...

Page 127: ...cations Uniib ITU investigates and make recommendations on international standards for facsimiles 2 Definition of Each Group Group I G1 A 4 size documents without using formats which reduce the band width of a signal sent over telephone lines Determined in 1968 Transmission for about 6 minutes at scanning line density of 3 85 lines mm Group II G2 Using reduction technology in the modulation demodu...

Page 128: ...rol time This is time at the start of transmission when the functions at the sending and receiving sides are confirmed the transmission mode is established and transmission and reception are synchronized Image transmission time This is the time required for the transmission of document contents image data In general this time is recorded in the catalog etc Hold time This is the time required after...

Page 129: ...50Hz 1 An example of the binary process in G3 communication is shown below Explanation of Signals Control signals are comprised mainly of 8 bit identification signals and of the data signals added to them Data signals are added to DIS and DCS signals Signal DIS Digital Identification Signal Identification Signal Format 00000001 Function Notifies the capacity of the receiving unit The added data si...

Page 130: ...ture elements along scan line length of 255 mm 1 Invalid 19 20 0 0 0 1 1 0 1 1 Maximum recording length capability A4 297 mm Unlimited A4 297 mm and B4 364 mm Invalid Maximum recording length A4 297 mm Unlimited B4 364 mm Invalid Signal DCS Digital Command Signal Identification Signal Format X1000001 Function Notifies the capacity of the receiving machine obtained at DIS and announces the transmis...

Page 131: ...0 to 9600 bps designated by DCS and the receiving side optimizes the automatic equalizer etc according to this signal TCF Training Check Sends 0 continuously for 1 5 seconds at the same speed as the training signal CFR Confirmation to Receive X0100001 Notifies the sending side that TCF has been properly received If TCF is not properly received FTT Failure To Train X0100010 is relayed to the sender...

Page 132: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 132 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 133: ... Facsimile Reception The analog image data which is received from the telephone line passes through the NCU section and enters pin 60 of the modem IC5 The signals that enter pin 60 of the modem IC5 are demodulated in the board to digital image signals then placed on the data bus In this case the image signals from the telephone line are transmitted serially Hence they are placed on the bus in 8 bi...

Page 134: ...B TONE1 ENB Analog Digital LINE RX TONE1 VOLOUT ASIC IC1 VOLIN SPKRM SPKRP LINEOUT SIA IC5 2 0V MIC CN3 SP CN9 SP H S SP MIC IC2 IC10 Ref LINEIN MICM MICP 5VA 5V Q1 OP PANEL MIC 24V 12V 24V Ref SPKRM SPKRP LINEOUT PIA MICREF LINEIN MICM MICP 12V IC3 Line CN4 BELL JAM JAM 5VD H S TX MUTE 2V RLY KX FT901 903CX B W S ANALOG BOARD BLOCK DIAGRAM NC EXT TEL CN5 134 KX FT901CX B KX FT903CX B KX FT901CX W...

Page 135: ...elephone side Break and switches to the open side make when the unit starts facsimile communication IC1 130 High Level CN2 7 CN1 7 Q10 ON RLY1 make 8 8 3 BELL DETECTION CIRCUIT 1 Circuit Operation The signal waveform for each section is indicated below The signal low level section input to pin 23 of ASIC IC1 on the digital board is read TEL LINE PC2 1 2 4 CN1 11 CN2 11 IC1 23 8 8 4 PULSE DIALING I...

Page 136: ...ion signal is input from CN1 pin 5 and output to the TEL line through C29 R29 R28 and T1 Without a side tone circuit the transmission signal would return to the reception amplifier via C29 and R28 Here the signal output from CN1 pin 5 passes through C29 R24 and R23 and enters the amplifier IC3 pin 3 This is used to cancel the return portion of the transmission signal This is the side tone circuit ...

Page 137: ...ignal path Refer to CHECK SHEET P 93 8 9 3 MONITOR CIRCUIT FOR EACH SIGNALS 1 Function This circuit monitors various tones such as 1 DTMF tone 2 Alarm Beep Key tone Bell 3 Dummy ring back tone 2 Signal path Refer to CHECK SHEET P 93 8 10 ATAS AUTOMATIC TELEPHONE ANSWERING SYSTEM SECTION 8 10 1 REMOTE RECEIVING 1 Function This is the parallel connection DTMF signal for the TEL mode between a and b ...

Page 138: ...8 10 2 CIRCUIT DIAGRAM 138 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 139: ...L BOARD The key matrix table is shown below IC1 ASIC DIGITAL BOARD OPERATION BOARD READ POSITION SENSOR DOCUMENT SENSOR CN7 CN1 Chip on board type GATE ARRAY IC1 CN2 7X5 KEYS MATRIX LED KSL0 4 XLED13 14 SW41 SW42 XLED11 12 XLED 15 LCD LED5 KIN0 KIN2 7 KX FT901 903CX B W S OPERATION BOARD BLOCK DIAGRAM 139 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 140: ...ied for the crystal drive R13 and R14 are density control resistors Consequently in this unit the timing positive clock is generated by the LCD interface circuitry in the gate array IC1 Density Normal Dark LED1 IC1 22pin H L 140 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 141: ...noise voltage and the noise electric field strength Rectifier Circuit The input current is rectified by 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 141 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W K...

Page 142: ...upplied 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 stabilization occurs Also when the current load becomes too large in order to decrease the voltage output the increase in is controlled and the output voltage is stabilized Therefore basically the...

Page 143: ...es 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 output increases because the error detecting circuit or control circuit...

Page 144: ...9 REFERENCE MATERIAL DATA 9 1 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 144 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 145: ... PbF Pb free P 3 9 2 HOW TO REPLACE THE FLAT PACKAGE IC Even if you do not have the special tools for example a spot heater to remove the Flat IC with some solder large amount a soldering iron and a cutter knife you can easily remove the ICs that have more than 100 pins 9 2 1 PREPARATION 9 2 2 FLAT PACKAGE IC REMOVAL PROCEDURE 1 Put plenty of solder on the IC pins so that the pins can be completel...

Page 146: ...g foil 2 Apply flux to all pins of the FLAT PACKAGE IC 3 Solder the pins sliding the soldering iron in the direction of the arrow 9 2 4 BRIDGE MODIFICATION PROCEDURE 1 Lightly resolder the bridged portion 2 Remove the remaining solder along the pins using a soldering iron as shown in the figure below 146 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 147: ...9 3 TEST CHART 9 3 1 ITU T No 1 TEST CHART 147 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 148: ...9 3 2 ITU T No 2 TEST CHART 148 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 149: ...10 FIXTURES AND TOOLS 149 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 150: ...11 CABINET MECHANICAL 11 1 OPERATION PANEL SECTION 150 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 151: ...11 2 UPPER CABINET SECTION 151 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 152: ...11 3 LOWER CABINET CROSS REFERENCE MOTOR SECTION P 153 152 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 153: ...11 4 MOTOR SECTION 11 4 1 KX FT901CX B W S 153 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 154: ...11 4 2 KX FT903CX B W S 154 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 155: ...11 5 ACTUAL SIZE OF SCREWS 155 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 156: ...12 ACCESSORIES AND PACKING MATERIALS 156 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 157: ...ON PS HB 7 PFUV1073Z1 COVER HOLE KX FT901 903CX B 7 PFUV1073Z2 COVER HOLE KX FT901 903CX W 7 PFUV1073Z3 COVER HOLE KX FT901 903CX S 8 PFDG1123Z GEAR PLATEN 9 PFDJ1021Z PLATEN SPACER R POM HB 10 PFDN1033Z ROLLER PLATEN 11 PFDJ1020Z PLATEN SPACER L POM HB 12 PFHX1743Z READING SHEET 13 PFHG1064Z SEPARATION RUBBER 14 PFUS1523Z SPRING DOCUMEN FEED 15 PFDG1170Z GEAR PLATEN POM HB 16 PFDN1044Z ROLLER PLA...

Page 158: ... 117 PFKM1131Y2 CABINET MAIN KX FT901 903CX W PS VO 117 PFKM1131Y3 CABINET MAIN KX FT901 903CX S PS VO 13 1 4 MOTOR SECTION Ref No Part No Part Name Description Remarks 130 PFMH1084Z ANGlE MOTOR 131 L6HAGCLK0002 MOTOR S 132 Not Used KX FT901CX B W S 132 PFHR1214Z ARM CUTTER KX FT903CX B W S 133 Not Used KX FT901CX B W S 133 PFDG1174Y GEAR CUTTER ARM KX FT903CX B W S POM HB 134 PFHX1413Z GEAR SHEET...

Page 159: ... PQLQR2KA20T COIL S L20 PQLQR2KA20T COIL S BATTERY BAT1 PFSU1004Z LITHIUM BATTERY S COMPONENTS PARTS Ref No Part No Part Name Description Remarks RA1 EXB38V101JV RESISTOR ARRAY S RA2 EXB38V101JV RESISTOR ARRAY S RA3 EXB38V101JV RESISTOR ARRAY S RA4 EXB38V101JV RESISTOR ARRAY S RA7 EXB38V101JV RESISTOR ARRAY S RA8 EXB38V101JV RESISTOR ARRAY S RA9 EXB38V101JV RESISTOR ARRAY CRYSTAL OSCILLATORS X1 PF...

Page 160: ...1E104ZFV 0 1 C30 ECUV1C104KBV 0 1 Ref No Part No Part Name Description Remarks C31 ECUV1E104ZFV 0 1 C32 ECUV1E104ZFV 0 1 C33 ECUV1C104KBV 0 1 C34 ECUV1H102KBV 0 001 C35 ECUV1H150JCV 15P C36 ECUV1E104ZFV 0 1 C38 ECUV1E104ZFV 0 1 C39 ECUV1H120JCV 12P C40 ECUV1E104ZFV 0 1 C41 ECUV1E104ZFV 0 1 C42 ECUV1E104ZFV 0 1 C43 ECUV1E104ZFV 0 1 C44 ECUV1E104ZFV 0 1 C45 ECUV1E104ZFV 0 1 C48 ECUV1E104ZFV 0 1 C49 ...

Page 161: ... OSCILLATOR X3 PFVC32256ZAT CRYSTAL OSCILLATOR S FUSES F1 PFRB0031125T FUSE S F2 PFRB001251KC FUSE S RESISTORS L2 ERJ3GEY0R00 0 L3 ERJ3GEYJ101 100 Ref No Part No Part Name Description Remarks L4 ERJ3GEYJ101 100 L5 ERJ3GEYJ101 100 L7 ERJ3GEYJ101 100 L8 ERJ3GEYJ101 100 L13 ERJ3GEY0R00 0 L14 ERJ3GEY0R00 0 L15 ERJ3GEY0R00 0 L17 ERJ3GEY0R00 0 L18 ERJ3GEY0R00 0 R1 ERJ3GEYJ472 4 7K R2 ERJ3GEYJ472 4 7K R3...

Page 162: ... 1 C50 ECUV1E104ZFV 0 1 C51 ECUV1E104ZFV 0 1 C52 ECUV1E104ZFV 0 1 Ref No Part No Part Name Description Remarks C55 ECUV1E104ZFV 0 1 C56 ECUV1C104KBV 0 1 C58 ECUV1C333KBV 0 033 C59 ECUV1H103KBV 0 01 C61 ECUV1C104KBV 0 1 C62 ECUV1H080DCV 8P C64 ECUV1H472KBV 0 0047 S C65 ECUV1C104KBV 0 1 C66 ECUV1H080DCV 8P C67 ECUV1E104ZFV 0 1 C68 ECUV1H330JCV 33P C70 ECUV1H681JCV 680P S C71 ECUV1E104ZFV 0 1 C73 ECU...

Page 163: ... R16 ERJ3GEYJ333 33K R17 ERJ3GEYJ683 68K R18 ERJ3GEYJ753 75K R20 ERJ3GEYJ224 220K R21 ERJ3GEYJ224 220K R22 ERJ3GEYJ393 39K R23 ERJ3GEYJ512 5 1K R24 ERJ3GEYJ124 120K R25 ERJ3GEYJ474 470K R26 ERJ3GEYJ103 10K R28 ERDS2TJ221 220 S R30 ERJ3GEYJ822 8 2K R32 ERJ3GEYJ682 6 8K R34 ERJ3GEYJ562 5 6K R35 ERJ3GEYJ153 15K R36 ERJ3GEYJ433 43K R40 ERJ3GEY0R00 0 R44 ERJ3GEYJ622 6 2K R45 ERJ3GEYJ222 2 2K R47 ERDS1T...

Page 164: ...B SWITCH S SW36 EVQ11Y05B SWITCH S SW37 EVQ11Y05B SWITCH S SW38 EVQ11Y05B SWITCH S SW39 EVQ11Y05B SWITCH S SW40 EVQ11Y05B SWITCH S SW41 EVQ11Y05B SWITCH S SW42 EVQ11Y05B SWITCH S Ref No Part No Part Name Description Remarks RESISTORS R9 ERJ3GEYJ101 100 R10 ERJ3GEYJ472 4 7K R11 ERJ3GEYJ331 330 R12 ERJ3GEYJ563 56K R13 ERJ3GEYJ273 27K R14 ERJ3GEYJ561 560 R17 ERJ3GEYJ271 270 R24 ERJ3GEY0R00 0 R25 ERJ3...

Page 165: ...V 0 22 C102 ECQU2A104MV 0 1 C103 PFKD2E3KH102 0 001 S C105 PFKD2E3KH222 0 0022 C106 UEB2W560U 56 S C108 ECKD3A102KBP 0 001 C109 PFCEA50YXA22 22 C110 PFKDEGA222M 0 0022 S C119 ECKD3A470KBP 47p C121 ECUV1H472KBV 0 0047 C122 ECUV1A224KBV 0 22 C123 ECUV1H103KBV 0 01 C124 ECUV1A474KBV 0 47 S C125 ECUV1H471JCV 470p C126 ECUV1H104KCV 0 1 C201 PFCEA35F471 470 S C202 ECKN3A102KBP 0 001 C203 PFCEA16A470 470...

Page 166: ...25 C46 R51 R55 C36 R40 CLK FTG R65 R62 R76 C123 R107 C96 EYEXY EYESYNC 3 3V BATIN EYECLK R67 R66 R74 C57 R72 R64 R48 R104 C106 C105 C60 R121 5VA C104 C101 R108 R109 R105 R106 R96 R95 R94 R90 C91 C94 C95 C122 2 1 R119 C92 R99 R103 L12 7 CN8 D3 C110 C109 C125 1 R60 C53 C55 DG R41 R58 R56 C40 R45 R47 R46 C32 R54 C56 R63 SIG R115 R28 1 36 37 72 73 108 TEST X1 RA9 C97 C89 R98 16 1 3 5 4 IC3 J1 DG CN9 B...

Page 167: ... R36 C120 R17 R15 R14 R13 R12 R102 C98 R110 R91 C111 C90 C88 R100 C93 C71 C63 C43 C48 C41 C31 C28 C17 R5 R1 R3 C1 C7 C5 R6 C114 C27 C45 C42 R4 R2 C3 R8 R57 R43 C29 L2 R9 C54 C86 C74 C117 C76 R85 R111 R116 R117 R122 R123 C124 R120 C127 C126 R118 C121 8 5 1 4 IC12 C112 R112 R101 C85 C81 C107 C108 PFUP1393Z MODEM3 3V 3 3V BATIN 2 5V BATIN 2 5V 3 3V XTEST RESET PbF KX FT901CX B KX FT903CX B KX FT901CX...

Page 168: ... 16 J5 J9 J19 FLT3 1 4 8 5 J7 J8 J16 PFUP1394Z UT J15 J31 J17 J18 J33 J29 J32 AUTO CH R83 D5 D4 R57 R85 R47 J21 J20 C30 C39 C10 C6 SW2 C62 CN3 C55 C58 C29 C15 C4 SW1 CN4 CN5 C48 T3 C50 C49 D12 D13 D6 D1 D15 D3 D14 D2 R43 E Q8 PC2 PC3 PC1 R28 R29 R68 PCB CH KX FT901 903CX B W S ANALOG BOARD COMPONENT VIEW KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S 168 ...

Page 169: ...56 C46 L15 R66 R65 C45 R49 C38 R45 C34 R37 R39 L13 L18 L12 C37 L10 C52 R63 R36 R35 R40 R46 C51 C40 R58 R34 R55 L24 C65 C26 R30 R32 R22 L1 C1 R5 R81 R38 C57 R79 L23 L30 L31 L28 L29 L11 C32 C41 L17 C63 L22 L25 R71 C61 C53 R54 R73 IC2 R51 R70 R27 C5 R7 R12 R67 DA1 R82 R80 L26 L27 R48 R14 C56 L32 L33 D16 PFUP1394Z UT PbF L21 L19 E Q4 E Q2 E Q5 E Q3 E Q6 E Q7 E Q9 16 1 PC2 D7 1 2 3 4 PC3 3 4 1 2 PC1 1 ...

Page 170: ...CN1 J15 J3 J4 J13 J14 No 1 No 12 SW10 No 2 No 13 SW20 No 3 No 14 SW6 No 4 No 15 SW16 No 5 No 16 SW15 No 6 No 17 SW39 No 9 No 20 SW9 No 8 No 19 SW7 No 7 No 18 ONE TOUCH DIAL STATION KEY CN2 1 10 SW8 SW42 LED1 No 10 RECEIVE MODE SW41 CALLER ID SW2 STOP SW5 C13 FAX START SET SW3 COPY PS1 No 21 SW37 No 11 No 22 SW1 LOWER SW19 UP VOL SW14 PREV SW38 NEXT SW4 DOWN VOL NAVIGATOR SW40 HELP 1 2 3 4 5 6 7 8 ...

Page 171: ... 12 11 1 44 34 33 C7 C9 C6 R45 R44 C3 GND R47 C8 R53 FG R3 C12 C11 R5 C10 R4 Q1 E BLACK MIC MIC R6 R7 R8 C16 C19 R17 C15 C23 R51 R52 R13 R15 R14 C17 R12 R10 R9 C14 SW44 C18 R25 R50 5V AG RED 1 2 3 4 5 6 7 8 9 A B C D E F G H I PbF PFUP1395Z UT KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S 171 ...

Page 172: ...F FIRE REPLACE KX FT901 903CX B W S POWER SUPPLY BOARD COMPONENT VIEW 14 4 2 POWER SUPPLY BOARD BOTTOM VIEW PRIMARY SECONDARY T3 15AH 250V 68 4839A F101 D104 D103 D102 D101 J1 J2 J3 J4 C202 R224 D201 C102 C108 R104 R107 R109 R106 L103 D108 T101 C119 C221 C201 24 7 CN301 1 5V GND GND R203 R202 C203 C106 D105 C123 C125 C124 R127 R126 C121 R124 C105 R137 R103 R105 R128 R122 R102 C103 R101 C101 ZNR101...

Page 173: ...ements are taken with an oscilloscope or a tester with a ground 2 The schematic diagrams and circuit board may be modified at any time with the development of new technology 173 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 174: ...16 MEMO 174 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S ...

Page 175: ...R11 95 ADR12 96 RBA0 97 RBA1 98 RBA2 99 RBA3 100 RBA4 101 RBA5 OP 102 RBA6 IOP96 103 STB1 104 STB2 105 STB3 106 XRESET 107 VDD3 3V 108 VSS 109 VSS 110 VDD3 3V 111 XDRESET 112 VDD5 0V 113 VSS 114 XRESETI 115 XWDERR 116 THDAT 117 THCLK 118 THLAT 119 STBNP 120 RM0 IOP00 121 RM1 IOP01 122 RM2 IOP02 123 RM3 IOP03 124 RXE IP04 125 TM0 IOP10 126 VDD2 5V 127 VSS 128 TM1 IOP11 129 TM2 IOP12 130 TM3 IOP13 1...

Page 176: ...RESERVED NC 29 SOUT_S NC 30 SIN_S NC 31 FSYNC_S NC 32 IARESET_S NC 33 AGND1 34 LINEIN_S NC 35 MICP_S NC 36 MICM_S NC 37 MICBIAS_S NC 38 NC 39 NC 40 VREF_S NC 41 VC_S NC 42 VAA_S NC 43 LINEOUT_S NC 44 NC 45 AGND2 46 SPKRP_S NC 47 SPKRM_S NC 48 AVDD_S NC 49 RESERVED NC 50 ICLK_S NC 51 MCLK_P 52 CTRLSIN_P 53 RESERVED 54 SOUT_P 55 SIN_P 56 FSYNC_P 57 IARESET_P 58 AGND3 59 NC 60 LINEIN_P 61 MICP_P 62 M...

Page 177: ...K THERMAL HEAD BLOCK R27 R24 R25 R26 R51 470 Z0 1u C29 XRESET R29 22K Z0 1u C44 R52 100 C28 Z0 1u RA1 100 1 2 3 4 5 6 7 8 C37 NC C22 RA4 100 1 2 3 4 5 6 7 8 X1 32 768KHz BR3 R37 C35 J15p Z0 1u C20 C25 Z0 1u XNMI Z0 1u C41 C33 K0 1u R30 43K 3 3VD C26 K2200p C39 J12p Z0 1u C17 R35 4 7K C19 J100p C18 Z0 1u R33 20K 5VD 2 5V C30 K0 1u RA3 100 1 2 3 4 5 6 7 8 Z0 1u C31 3 3VA C38 Z0 1u IC1 1 VSSA 2 VDDA3...

Page 178: ...XD SA1CLK RS4 RS3 RS2 RS1 RS0 YCLK IACLK IA1CLK CTRLSIN_S NC RESERVED NC SOUT_S NC SIN_S NC FSYNC_S NC IARESET_S NC AGND1 LINEIN_S NC MICP_S NC MICM_S NC MICBIAS_S NC NC NC VREF_S NC VC_S NC VAA_S NC LINEOUT_S NC NC AGND2 SPKRP_S NC SPKRM_S NC AVDD_S NC RESERVED NC ICLK_S NC MCLK_P CTRLSIN_P RESERVED SOUT_P SIN_P FSYNC_P IARESET_P AGND3 NC LINEIN_P MICP_P MICM_P MICBIAS_P 39 40 41 42 43 44 45 46 4...

Page 179: ... 4 7K R3 100 R27 NC R8 10K 39K R22 R24 120K R21 220K R4 4 7K R15 2 2M 0 R5 R37 NC R40 0 R31 NC R11 120K R26 10K R7 100 R9 6 2K 470K R25 R28 220 1 4W R20 220K R39 NC R29 0 R23 5 1K 33K R16 R14 1 6K 15K R35 R6 4 7K R38 NC R1 100 R18 75K R13 75K R10 160K 5 6K R34 82K R17 6 8K R32 D3 5 6V D2 5 6V D1 4 7V Q1 Q6 NC Q2 Q3 Q5 NC Q4 NC SW2 1 2 3 4 T1 NC 1 2 3 4 6 T2 1 2 3 4 5 CN1 1 2 3 4 5 6 7 8 9 10 11 12...

Page 180: ... 0 L33 BEAD L31 0 L25 BEAD L23 BEAD L21 NC L14 0 L17 0 L18 0 L27 BEAD JJ2 0 JJ3 0 R57 15K 1 2W R70 1 5K 22 R66 R67 2 2K 18K R61 R55 330 R59 NC R63 10K R52 150 2W R51 2 2K R56 220K R64 10K R46 NC R43 NC R65 47K 2 2K R45 R48 NC R71 1 5K 750K R49 330 R73 R58 10K R53 NC R68 22 1 4W D12 D6 NC D14 D13 D7 NC 1 2 3 4 D4 3 0V D5 3 0V 0 F1 POS1 SA2 3000V SA1 350V ZNR1 NC Q8 NC Q9 Q10 Q7 NC L20 NC 1 2 3 4 FL...

Page 181: ... No 4 No 15 SW7 No 7 No 18 SW8 No 10 No 21 SW9 No 8 No 19 SW10 No 2 No 13 SW11 RECORD NC SW12 PLAY NC SW13 MENU SW14 PREV SW15 No 6 No 17 SW16 No 5 No 16 SW17 ERASE NC SW18 SP PHONE MONITOR SW19 UP VOL SW20 No 3 No 14 SW21 8 SW22 5 SW23 REDIAL PAUSE SW24 2 SW25 0 SW26 9 SW27 6 SW28 MUTE SW29 3 SW30 SW31 7 SW32 4 SW33 FLASH SW34 1 SW35 SW36 No 1 No 12 SW37 No 11 No 22 SW38 NEXT SW39 No 9 No 20 SW40...

Page 182: ... 8K C101 0 22 F101 T3 15A 250V D101 R105 0 22 2 C121 4700p C125 470p 4 5 3 6 2 7 1 8 R122 270 D107 R 125 IC101 D108 R108 15 IC202 R128 100 D106 Q101 G R104 R107 150K 2 T101 TRANS D201 1 24V 2 24V 3 24V 4 GND CN301 5 GND 6 GND 7 5V C202 1000p 1K D202 C206 C110 C221 2200p R223 IC201 C205 1 50 100 D S R203 47 1 2 C204 47 35 TH101 R124 180 C126 0 1 50 Cycle 15 4 µs 55V 25V 0V Cycle 15 4 µs 20V 10V 0V ...

Page 183: ...183 KX FT901CX B KX FT903CX B KX FT901CX W KX FT903CX W KX FT901CX S KX FT903CX S Y M KXFT901CXB KXFT903CXB KXFT901CXW KXFT903CXW KXFT901CXS KXFT903CXS ...

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