Panasonic KX-TC1881B Service Manual Download Page 1

Page: 1 / 96

ORDER NO. KM40103769C1

F11

Telephone Equipment

KX-TC1881B

900MHz Cordless Phone

Black Version

(for U.S.A.)

SPECIFICATIONS

Summary of Contents for KX-TC1881B

Page 1: ...ORDER NO KM40103769C1 F11 Telephone Equipment KX TC1881B 900MHz Cordless Phone Black Version for U S A SPECIFICATIONS 1 ...

Page 2: ...and distribution is a violation of law 1 STANDARD BATTERY LIFE After your Panasonic battery is fully charged While in use TALK near the base unit Up to about 6 hours away from the base unit Up to about 4 hours While not in use Stand By Up to about 14 days Within about 10 feet 3 m 2 ...

Page 3: ...2 LOCATION OF CONTROLS Base unit 3 ...

Page 4: ... Handset 4 ...

Page 5: ...3 DISPLAY The handset shows you instructions and information on the display This display prompts are shown below 5 ...

Page 6: ...6 ...

Page 7: ...7 ...

Page 8: ...4 CONNECTIONS 8 ...

Page 9: ...C ADAPTOR PQLV1Z The AC adaptor must remain connected at all times It is normal for the adaptor to feel warm during use If your unit is connected to a PBX which does not support Caller ID services you cannot access those services 9 ...

Page 10: ...4 1 Adding Another Phone This unit will not function during a power failure To connect a standard telephone on the same line use the Panasonic T adaptor KX J66 10 ...

Page 11: ...5 OPERATIONS 5 1 Making Calls 5 1 1 With the Handset 11 ...

Page 12: ...12 ...

Page 13: ...13 ...

Page 14: ...5 1 2 With the Base Unit DIgital Duplex Speakerphone 14 ...

Page 15: ...15 ...

Page 16: ...5 2 Answering Calls 16 ...

Page 17: ...5 2 1 With the Handset 5 2 2 With the Base Unit 17 ...

Page 18: ...6 DISASSEMBLY INSTRUCTIONS 18 ...

Page 19: ... Cabinet Screws 2 6 X 12 D X 2 6 Main P C Board Screw 2 6 X 12 E X 1 Screws 2 6 X 8 F X 2 Remove the lead Remove the P C Board Note 1 After removing 2 screws D insert a driver into 1 and pull it outside of the cabinet 6 1 Adjustment to prevent the cabinet from opening at dropping Stick the two sheets and the rubber on the front cabinet as shown in the figure to prevent the cabinet from opening at ...

Page 20: ...7 ASSEMBLY INSTRUCTIONS 7 1 Assembly the LCD to P C Board Handset 7 2 Replace the RF unit 20 ...

Page 21: ...solder on six legs of RF unit 3 Remove solder on all pads of RF unit 4 Replace defective RF unit with new HS RF unit NOTE Do not use BU RF unit for HS one HS RF unit is different from BU one 5 Solder all pads of RF unit 6 Solder six RF legs 7 Put LCD unit and solder speaker wire NOTE Speaker wire has polarity Component View Solder Side View 21 ...

Page 22: ...8 TROUBLESHOOTING GUIDE Below main flow chart shows the basic check procedure right side each item 8 1 8 9 is corresponded to detailed each item from next page 22 ...

Page 23: ...8 1 Check Power 8 2 Check Sp phone Voice Transmission 8 3 Check Sp phone Voice Reception 23 ...

Page 24: ...8 4 Check Battery Charge 24 ...

Page 25: ... Defective Unit Prepare HS JIG Handset jig and BS JIG Base Unit jig Place the HS JIG on the cradle of the base unit for checking then confirm that they are linked Place the handset for checking on the cradle of the BS JIG then confirm that they are linked How to confirm the link is as follows press the TALK button and confirm that the LEDs of the base unit is turned ON 8 6 2 Check Items 25 ...

Page 26: ...ty is OK In TALK mode LCD display change to TALK TEST or TALK on TEST POWER mode or NORMAL POWER mode HS JIG becomes NORMAL POWER mode immediately after the power supply turning on NOTES 1 If when setting the handset to TEST SUPER LOW mode if handset beeps 3 times and the LCD shows No link to base Place on cradle and try again press 2 5 8 0 simultaneously and then disconnect battery Re install bat...

Page 27: ...ATOR on base unit red LED lights Press TALK button on handset and if it links with the base then this handset sensitivity is OK BS JIG becomes NORMAL POWER mode immediately after the power supply turning on NOTES 1 If when setting the base to TEST SUPER LOW mode if handset beeps 3 times and the LCD shows No link to base Place on cradle and try again press 2 5 8 0 simultaneously and then disconnect...

Page 28: ...8 6 3 RF Check Flowchart Each item 1a 5 of RF check Flowchart is corresponded to Check Table for RF Block Please refer each item one by one 28 ...

Page 29: ...e MODE to TEST POWER position JIG 2 Press TALK key of HS to establish link 30cm away from BS JIG 2 IC101 working confirmation Procedure 1 Set Test mode Continuos Send Low Power 3 2 Confirm X101 oscillate 24MHz 4 1 Set Test mode Continuos Send Low Power 2 Confirm X101 oscillate 24MHz 4 Check point 1 Check X101 oscillator 2 Check DSP interface IC101 IC501 BS 5 1 Check X101 oscillator 2 Check DSP int...

Page 30: ... HS JIG on BS 2 Set MODE to NORMAL POWER position of HS JIG 3 Press TALK key of HS JIG to establish link 4 Change MODE to TEST POWER position of HS JIG 5 Press TALK key of HS JIG to establish link about 30cm away from BS 1 Put HS on BS JIG 2 Set MODE to NORMAL POWER position JIG 3 Press TALK key of HS to establish link 4 Change MODE to TEST POWER position JIG 5 Press TALK key of HS to establish li...

Page 31: ...8 7 Check Handset Voice Transmission 31 ...

Page 32: ...NOTE If you change MIC Put some bond or hot melt at hole of MIC behind after changing MIC 8 8 Check Handset Voice Reception 32 ...

Page 33: ...NOTE When checking the RF UNIT Refet to Check the RF Unit 8 9 Check Call ID 33 ...

Page 34: ...9 TEST MODE AND ADJUSTMENT 9 1 Test mode flow chart for Base Unit 34 ...

Page 35: ... 1 See Base Unit Reference Drawing 2 Special check method for Base Unit individually 9 2 Test mode flow chart for Handset 35 ...

Page 36: ...ncy counter because sending signal is spread by PN code So the confirmation and adjustment is made under the Continuous Send mode of TEST MODE Adjust the TX carrier CW frequency on the RF unit Equipment Frequency counter TP for adjustment TP_ANT Adjustment point VC101 RF unit Adjustment range 906 000 0 002 MHz 1ch 9 4 Base Unit Reference Drawing Component View Flow Solder Side View 36 ...

Page 37: ...ame frequency Refer to the Frequency Table 10 2 Time Division Duplex TDD operation Transmission reception between the base unit and handset is performed by time sharing as shown in Fig 7 1 slot time of transmission and reception is 1mS Same frequency is used in transmitting and receiving The figure shows an example the frequency of 3ch is used in transmitting between the base unit and handset Fig ...

Page 38: ...ng four fields A 16 bit Preamble field An 8 bit Data Channel field An 8 bit Sync Word A 64 bit ADPCM Payload 10 3 Spread Spectrum Transmission and reception are operated using the spread spectrum method DSS Digital Spread Spectrum Mixing the original signal with the pseudo random noise code PN code works the spread spectrum In this system PN code is 15 chip Although the band width is spread fiftee...

Page 39: ...g through filter F102 and the balun T101 to perform the de spread then input to DSP IC201 DSP performs ADPCM decoding to convert the signal into the voice signal then it is output to the speaker Transmission The voice signal input from the microphone is led to DSP IC201 The DSP generates ADPCM signal As well as the reception it is converted into the RF signal by RFIC IC101 Passing through the balu...

Page 40: ...10 5 EXPLANATION OF BBIC DATA COMMUNICATION 10 5 1 Calling 40 ...

Page 41: ...10 5 2 To Terminate Communication 10 5 3 Ringing 10 5 4 ID Change 41 ...

Page 42: ...11 TERMINAL GUIDE OF IC S TRANSISTORS AND DIODES 11 1 Base Unit 11 2 Handset 42 ...

Page 43: ...12 BLOCK DIAGRAM Base Unit 12 1 Power Supply 12 2 DSP Control 43 ...

Page 44: ...CUIT OPERATION Base Unit 13 1 SP PHONE RX Circuit 13 1 1 LINE 1 Circuit Operation Telephone Line Interface Q161 C168 R167 Q162 C171 R171 C173 Q164 R192 C183 pin 51 of IC501 pins 35 and 37 of IC501 Speaker 44 ...

Page 45: ...262 PC210 C271 IC251 2 C273 R282 C298 Q264 C276 pin 44 of IC501 pins 35 and 37 of IC501 Speaker 13 2 SP PHONE TX Circuit 13 2 1 LINE 1 Circuit Operation MIC C425 C426 C418 C419 pins 60 and 61 of IC501 pin 41 of IC501 R179 C179 R189 R188 C186 R186 Q161 Telephone Line Interface Circuit 45 ...

Page 46: ...13 2 2 LINE 2 Circuit Operation MIC C425 C426 C418 C419 pins 60 and 61 of IC501 pin 39 of IC501 R295 C279 R286 R287 R299 IC251 1 Q263 PC210 C270 IC250 1 C268 R268 Q261 Telephone Line 46 ...

Page 47: ...uit Operation IC301 is a regulated power supply The voltage at point A is regulated to 4 0V by IC301 The voltage at point B is dropped by D306 and D310 to 3 3V The voltage at point C is regulated to 5 5V by IC341 The voltage at point D is dropped by Q303 to 3 6V The voltage at point E is dropped by Q302 Q304 to 3 6V 47 ...

Page 48: ...o the line through Q161 LINE 1 Q261 LINE 2 13 5 LINE Sending Signal 13 5 1 LINE 1 The modulation signal input from the RF unit is demodulated by IC501 IC501 generates the ADPCM signal Digital corresponded to Audio signal and this ADPCM signal is input to RF unit Circuit Operation pin 41 of IC501 R179 C179 R189 R188 C186 R186 Telephone Line 48 ...

Page 49: ...e Circuit Operation pin 39 of IC501 R295 C279 R286 R287 pin 7 of IC251 Q263 pin 12 of PC210 pin 7 of PC210 C270 pin 7 of IC250 C268 R268 Telephone Line 13 6 Line Receiving Signal 13 6 1 LINE 1 The audio signal from line passes through Q162 and Q164 and the signal is input to pin 51 of IC501 IC501 modulates the input audio signal to output to the RF unit 49 ...

Page 50: ...262 PC210 IC251 and Q264 and the signal is input to pin 44 of IC501 IC501 modulates the input audio signal to output to the RF unit Circuit Operation Telephone Line T R Q261 C265 R267 pin 1 of IC250 Q262 pin 1 of PC210 pin 14 of PC210 C271 pin 1 of IC251 C273 R282 C298 Q264 R283 R278 C276 pin 44 of IC501 RF UNIT 13 7 Calling Line Identification Circuit Caller ID Function 50 ...

Page 51: ... which is modulated in an FSK Frequency Shift Keying format Data 0 is a 1200 Hz sine wave and data 1 a 2200 Hz sine wave The data for the caller ID from the telephone exchange is sent during the interval between the first and second rings of the bell signal The data from the telephone exchange is a modem signal which is modulated in an FSK Frequency Shift Keying format Data 0 is a 1200 Hz sine wav...

Page 52: ...hether to take the new call Function The CAS signal flows from T R C121 C122 R121 R122 IC121 IC501 pins 54 LINE 1 T R C221 C222 R221 R222 IC221 IC501 pins 47 LINE 2 and the ACK DTMF signal is returned to the telephone exchange The telephone exchange that received the ACK can send the data in the same manner as the caller ID If the unit deems that a telephone connected in parallel is in use ACK is ...

Page 53: ...etermines whether the telephone connected in parallel is on hook or off hook by detecting changes in the T R voltage Circuit Operation Parallel connection detection when on hook When on hook Q141 Q142 LINE 1 Q241 Q242 LINE 2 is ON the voltage is monitored pin 50 LINE 1 and 43 LINE 2 of IC501 There is no parallel connection if the voltage is 1 65 V or higher while a parallel connection is deemed to...

Page 54: ...E 2 of IC501 the presence absence of a parallel connection is determined when the voltage changes by 0 2 V or more 13 8 1 LINE 1 13 8 2 LINE 2 13 9 DSP Digital Speech Signal Processing Circuit General Description IC501 IC701 is a digital speakerphone speech signal processing system that implements all 54 ...

Page 55: ...used for stored system parameter and data 13 10 Telephone Line Interface 13 10 1 LINE 1 Circuit Operation ON HOOK Q101 is open Q101 is connected as to cut the DC loop current and to cut the voice signal The unit is consequently in an on hook condition SPECIFICATIONS In the on hook state idle the current flows between the telephone line and the unit is as follows T PO101 L101 C103 PC101 R102 L102 R...

Page 56: ...uently in an on hook condition SPECIFICATIONS In the on hook state idle the current flows between the telephone line and the unit is as follows T PO201 L201 C203 PC201 R202 L202 R The DC component is blocked by C203 there by providing an on hook condition The AC interface impedance is over 47 k thus satisfying the telephone company requirements 56 ...

Page 57: ...nal flows RFunit RXADPCMOUT IC501 pin 85 pins 35 and 37 of IC501 SP 4 The transmission signal flows MIC C425 C418 IC501 pin 61 IC501 pin 86 RFunit TXADPCMIN MIC C426 C419 IC501 pin 60 IC501 pin 86 RFunit TXADPCMIN 13 12 Initializing Circuit Function This circuit is used for to initialize the microcomputer when it incorporates an AC adaptor Circuit Operation When the AC Adaptor is inserted into the...

Page 58: ...14 BLOCK DIAGRAM Handset 15 CIRCUIT OPERATION Handset 58 ...

Page 59: ...from CHARGE1 and CHARGE2 terminals to charge the battery Q207 detects the voltage of CHARGE1 and CHARGE2 terminals then the handset makes ID code setting with the base unit 15 3 Ringer Circuit If the ringer volume is set to low and an alarm tone is output from 39 pin IC201 DSP and input to Q209 Then Q208 is turned off If the ringer volume is set to high Q208 turns on and results in a louder beep t...

Page 60: ...3 is the headphone jack When the headphone is connected the Q206 detect it The input from the microphone of the handset CIDIN CIDIP is cut and the microphone signal from the headphone is input to pin 47 of IC201 HMIN Also the power for the microphone is supplied from Q211 and the power is turned OFF on standby 60 ...

Page 61: ...P as the voice signal SPN is the inverse output of SPP and the speaker is driven by SPN and SPP CN203 is the headphone jack When the headphone is connected to this jack the output to the speaker of the handset SPN SPP is cut and the voice signal is output to the headphone HSOUT only 16 CPU DATA Base Unit 16 1 IC501 61 ...

Page 62: ...17 CPU DATA Handset 17 1 IC201 62 ...

Page 63: ...18 EXPLANATION OF IC TERMINALS RF Unit 18 1 IC101 63 ...

Page 64: ...64 ...

Page 65: ... Solder 115A 1 115B 1 or Almit Solder KR 19 KR 19RMA Soldering iron Recommended power consumption will be between 30 W to 40 W Temperature of Copper Rod 662 50 F 350 10 C An expert may handle between 60 W to 80 W iron but beginner might damage foil by overheating 65 ...

Page 66: ... matter is accurate setting of IC to the corresponding soldering foil 2 Apply flux for all pins of FLAT PACKAGE IC 3 Solder employing specified solder to direction of arrow as sliding the soldering iron 19 3 Modification Procedure of Bridge 1 Re solder slightly on bridged portion 2 Remove remained solder along pins employing soldering iron as shown in below figure 66 ...

Page 67: ...20 CABINET AND ELECTRICAL PARTS Base Unit 67 ...

Page 68: ...21 CABINET AND ELECTRICAL PARTS Handset 68 ...

Page 69: ...22 ACCESSORIES AND PACKING MATERIALS 69 ...

Page 70: ... on the type of assembly and in accordance with the laws governing part and product retention After the end of this period the assembly will no longer be available 2 Important safety notice Components identified by a mark special characteristics important for safety When replacing any of these components use only manufacture s specified parts 3 The S mark indicates service standard parts and may d...

Page 71: ...GB7Y BADGE 3 PQGT14074Z NAME PLATE 4 PQHG10609Z RUBBER SHEET 5 PQHR10753Y LED LENSE 6 PQKM10439W1 UPPER CABINET S 7 PQQT22049Z CHARGE LABEL 8 PQSA10095Z ANTENNA S 9 PQSX10136Z RUBBER SWITCH 21KEY 10 PQSX10140Z RUBBER SWITCH LINE SELECT 11 PQWE10022Z CHARGE TERMINAL 12 PQYF10171Y1 LOWER CABINET S 13 PQHG10635Z RUBBER 23 1 2 MAIN P C BOARD PARTS 71 ...

Page 72: ...ANSISTOR SI S Q201 2SA1972 TRANSISTOR SI S Q241 UN5213 TRANSISTOR SI S Q242 UN5213 TRANSISTOR SI S Q250 UN5213 TRANSISTOR SI S Q261 2SC2120 TRANSISTOR SI S Q262 2SB1218A TRANSISTOR SI Q263 2SB1218A TRANSISTOR SI Q264 2SD1819A TRANSISTOR SI S Q270 2SD1819A TRANSISTOR SI S Q301 2SD2136 TRANSISTOR SI Q302 2SD2136 TRANSISTOR SI Q303 2SD1758Q TRANSISTOR SI S Q304 2SD1758Q TRANSISTOR SI S Q321 2SD1819A ...

Page 73: ...LED S LED704 PQVDBR1111C LED S LED705 PQVDBR1111C LED S CONNECTORS CN101 PQJJ2H004Z CONNECTOR S CN201 PQJJ1T020Z CONNECTOR COILS L101 PQLQXF330K COIL S L102 PQLQXF330K COIL S L201 PQLQXF330K COIL S L202 PQLQXF330K COIL S L301 PQLQXF330K COIL S L302 PQLQXF100K COIL S L376 PQLQZK3R3K COIL S L377 PQLQZM100K COIL S L501 PQLQR2KA213 COIL S L517 PQLQR2K1A102 COIL C603 MQLRE3N3DF COIL C604 MQLRE15NJF COI...

Page 74: ...Q4R10XJ104 100k S R107 ERJ3GEYJ103 10k R108 PQ4R10XJ104 100k S R109 ERJ3GEYJ472 4 7k R112 ERJ3GEYJ103 10k R121 ERJ3GEYJ225 2 2M R122 ERJ3GEYJ225 2 2M R123 ERJ3GEYJ564 560k R124 ERJ3GEYJ564 560k R125 ERJ3GEYJ335 3 3M R126 ERJ3GEYJ223 22k R127 ERJ3GEYJ335 3 3M R128 ERJ3GEYJ103 10k R129 ERJ3GEYJ473 47k R130 ERJ3GEYJ473 47k R131 ERJ3GEYJ472 4 7k R132 ERJ3GEYJ473 47k R134 ERJ3GEYJ103 10k R135 ERJ3GEYJ2...

Page 75: ...183 18k R189 ERJ3GEYJ822 8 2k R192 ERJ3GEYJ392 3 9k R194 ERJ3GEYJ564 560k R195 ERJ3GEYJ105 1M R196 ERJ3GEYJ151 150 R197 ERJ3GEYJ332 3 3k R202 PQ4R10XJ473 47k S R203 ERJ3GEYJ103 10k R204 PQ4R10XJ106 10M S R205 PQ4R10XJ106 10M S R206 PQ4R10XJ104 100k S R207 ERJ3GEYJ103 10k R208 ERJ3GEYJ472 4 7k R212 ERJ3GEYJ103 10k R221 ERJ3GEYJ225 2 2M R222 ERJ3GEYJ225 2 2M R223 ERJ3GEYJ564 560k R224 ERJ3GEYJ564 56...

Page 76: ...63 ERJ3GEYJ470 47 R264 ERDS1VJ270 27 R265 ERJ3GEYJ152 1 5k R266 ERJ3GEYJ122 1 2k R267 ERJ3GEYJ332 3 3k R268 ERJ3GEYJ562 5 6k R269 ERJ3GEYJ103 10k R271 ERJ3GEYJ104 100k R272 ERJ3GEYJ221 220 R273 ERJ3GEYJ103 10k R274 ERJ3GEYJ472 4 7k R275 ERJ3GEYJ103 10k R277 ERJ3GEYJ104 100k R278 ERJ3GEY0R00 0 R279 ERJ3GEYJ182 1 8k R280 ERJ3GEYJ394 390k R281 ERJ3GEYJ561 560 R282 ERJ3GEYJ332 3 3k R283 ERJ3GEY0R00 0 ...

Page 77: ...ERJ3GEYJ180 18 R376 ERJ3GEYJ180 18 R377 ERDS1VJ221 220 R378 ERDS1VJ391 390 R381 ERJ3GEYJ563 56k R382 ERJ3GEYJ563 56k R383 ERJ3GEYJ103 10k R400 ERJ3GEYJ222 2 2k R405 ERJ3GEYJ102 1k R406 ERJ3GEYJ222 2 2k R420 ERJ3GEYJ562 5 6k R421 ERJ3GEYJ562 5 6k R503 ERJ3GEYJ271 270 R504 ERJ3GEYJ391 390 R505 ERJ3GEYJ391 390 R506 ERJ3GEYJ391 390 R507 ERJ3GEYJ391 390 R513 ERJ3GEYJ472 4 7k R521 ERJ3GEYJ103 10k R522 E...

Page 78: ... S C151 ECST0JY106 10 C160 ECUV1H103KBV 0 01 S C161 ECEA1CKA100 10 C162 ECUV1H101JCV 100P C163 ECUV1H103KBV 0 01 C165 ECEA0JKA331 330 C166 PQCUV1E333MD 0 033 S C167 ECEA1CKA100 10 C168 ECEA1HKA010 1 C169 ECUV1H222KBV 0 0022 C170 ECUV1H151JCV 150P C171 ECEA1HKA010 1 C173 ECUV1C273KBV 0 027 C176 ECUV1H270JCV 27P C178 ECUV1H272KBV 0 0027 C179 ECUV1A105ZFV 1 C181 ECUV1H470JCV 47P C182 ECUV1H821JCV 820...

Page 79: ...A331 330 C267 ECUV1C104ZFV 0 1 C268 ECEA1HKA010 1 C269 ECUV1H101JCV 100P C270 ECUV1A224KBV 0 22 C271 ECEA1HKA010 1 C272 ECUV1H562KBV 0 0056 C273 ECUV1C104KBV 0 1 C275 ECUV1H471JCV 470P S C276 ECUV1H333KBV 0 033 S C277 ECEA0JKA331 330 C278 ECUV1H102KBV 0 001 C279 ECUV1A105ZFV 1 C280 ECUV1H222KBV 0 0022 C281 ECUV1H101JCV 100P C283 ECUV1H270JCV 27P C285 ECUV1H272KBV 0 0027 C286 ECST0JY106 10 C287 ECU...

Page 80: ... 0 22 C426 ECUV1A224KBV 0 22 C430 ECEA0JKS220 22 S C502 ECUV1A105ZFV 1 C503 ECST0JY106 10 C504 ECUV1A105ZFV 1 C508 ECST0JY106 10 C509 ECUV1C104ZFV 0 1 C510 ECUV1C104ZFV 0 1 C511 ECUV1C104ZFV 0 1 C521 ECUV1C104ZFV 0 1 C551 ECUV1H103KBV 0 01 S C552 ECUV1H103KBV 0 01 S C553 ECUV1H103KBV 0 01 S C554 ECUV1C104ZFV 0 1 C560 ECST0JY106 10 C570 ECUV1H103KBV 0 01 S C571 ECUV1H103KBV 0 01 S C572 ECUV1H103KBV...

Page 81: ...LDER 108 PQHR10727Z LCD PLATE 109 PQHR10739Z SP HOLDER 110 PQHS10410W DOUBLE SIDE TAPE S 111 PQHS10425Z SP SPONGE 112 PQHX10862Z LCD COVER SHEET 113 PQHX10955Z LCD SHEET 114 PQHX10959Z CUSHION 115 PQJT10158Z CHARGE TERMINAL L 116 PQJT10159Z CHARGE TERMINAL R 117 PQKE10099Z1 EARPHONE CAP S 118 PQKF10312Z1 REAR CABINET S 119 PQKK10099Z1 BATTERY COVER S 120 PQKM10417Q1 FRONT CABINET S 121 PQP508SVC B...

Page 82: ...IODE SI D202 MA2ZD1400 DIODE SI D203 MA111 DIODE SI D206 PQVDS1ZB60F1 DIODE SI S D209 MA111 DIODE SI D210 MA111 DIODE SI D212 MA8150 DIODE SI D213 MA8150 DIODE SI LEDS LED201 PQVDSML310MT LED S LED202 PQVDSML310MT LED S LED203 PQVDSML310MT LED S LED204 PQVDSML310MT LED S LED205 PQVDSML310MT LED S LED206 PQVDSML310MT LED S LED207 PQVDSML310MT LED S CONNECTORS CN201 PQJS22B11Z FPC CONNECTOR CN202 PQ...

Page 83: ...J103 10k R225 ERJ3GEYJ472 4 7k R226 ERJ3GEYJ123 12k R227 ERJ3GEYJ473 47k R228 ERJ3GEYJ224 220k R229 ERJ3GEYJ102 1k R230 ERJ3GEYJ102 1k R231 ERJ3GEYJ102 1k R232 ERJ3GEYJ103 10k R233 ERJ3GEY0R00 0 R234 ERJ3EKF2204 2 2M R235 ERJ3EKF2204 2 2M R236 ERJ3GEYJ102 1k R241 ERJ3GEY0R00 0 R242 ERJ3GEYJ180 18 R243 ERJ3GEYJ180 18 R244 ERJ3GEYJ473 47k R245 ERJ3GEYJ103 10k R246 ERJ3GEYJ153 15k R247 ERJ3GEYJ391 39...

Page 84: ...104ZFV 0 1 C227 ECUV1H470JCV 47P C228 ECUV1C104ZFV 0 1 C229 ECUV1C104ZFV 0 1 C230 ECUV1C104KBV 0 1 C231 ECUV1A224KBV 0 22 C232 ECUV1C104KBV 0 1 C233 ECUV1C104ZFV 0 1 C234 ECUV1A224KBV 0 22 C236 ECUV1H060DCV 6P S C237 ECUV1H060DCV 6P S C239 ECUV1H103KBV 0 01 C249 ECST0GY226 22 C255 ECUV1A224KBV 0 22 C267 ECST0JX226 22 C269 ECUV1H330JCV 33P C270 ECST0JY475 4 7 C274 ECUV1C104ZFV 0 1 C277 ECUV1C563KBV...

Page 85: ...2298Z LEAFLET HS A11 PQJA10088Z TEL CORD P1 PQPH89Y PROTECTION COVER for Base Unit P2 XZB10X35A02 PROTECTION COVER for Handset P3 PQPK13170Z GIFT BOX 24 FOR SCHEMATIC DIAGRAM 24 1 Base Unit SCHEMATIC DIAGRAM Base Unit Notes 1 DC voltage measurements are taken with voltmeter from the negative voltage line This schematic diagram may be modified at any time with the development of new technology 24 2...

Page 86: ...nit 26 SCHEMATIC DIAGRAM RF Unit 27 CIRCUIT BOARD Base Unit 27 1 Component View 27 2 Flow Solder Side View 28 SCHEMATIC DIAGRAM Base Unit 29 CIRCUIT BOARD Handset 30 SCHEMATIC DIAGRAM Handset M KXTC1881B Printed in Japan 86 ...

Page 87: ...2 4V 490mVp p 90mVp p Headset TX RX 43dBm 600 Headset Input 1 1kHz Input 1 1kHz 18mVp p 45dBm 600 0 45V 3 0V 3 2 6 4 1 5 7 8 9 10 12 RX ADPCMO 11 TX ADPCMI C294 0 01u 0 01u 120n 120n 10K 12K 0 056u NC is the part not used IC201 IC202 IC204 IC203 IC205 ...

Page 88: ...ANT GND ANT VC101 ...

Page 89: ...TEST 10ch 1ch ...

Page 90: ... E B E C C E B C787 C743 C742 C741 R702 C780 C788 R255 C250 R132 R155 C150 R508 R218 C292 R808 C176 R515 C504 C251 C503 R257 C227 C502 R158 R233 R258 R232 C281 C153 C199 R184 C155 C164 C160 Q162 R171 R170 R164 C173 C181 R167 C170 R168 R265 R266 C191 R183 C131 C157 C156 C276 R284 R291 R293 C282 C289 R281 R374 R375 R376 R373 R283 R278 C249 R292 C126 R131 C125 R128 R224 D221 D246 C124 R126 R125 R239 ...

Page 91: ...TP_VCC2 14 3 15V LINE1 Tx 1 LINE1 Tx 2 6 0V 3 4 1V 4 5 5V 7 IC301 IC341 E B C E B C E B C B E C B E C ...

Page 92: ...12 4 4V 7 5 5V 5 8 8V 1 Rx 30mVp p 25mVp p 2 Rx 280mVp p 260mVp p 30mVp p 45mVp p 1 Tx 180mVp p 200mVp p 9 3 5V 11 5V 10 2 0V 2 Tx 140mVp p 130mVp p 10mVp p 10mVp p 2 Rx Rx LINE1 640mVp p LINE2 680mVp p 100mVp p 80mVp p 150mVp p 150mVp p Volume MAX 30mVp p 3 Rx 1 Tx 2 Tx 36mVp p 36mVp p 3 Tx Rx LINE1 LINE2 140mVp p 150mVp p Tx 800mVp p 820mVp p Rx 130mVp p 120mVp p Tx 820mVp p 820mVp p ...

Page 93: ...HANDSET COMPONENT VIEW ANT GND 100 MIC MIC TEST PULL UP 10 10 ANT VC101 SP SP ...

Page 94: ... X101 C111 GND GND TX_ADPCMI RX_ADPCMO PCM_SYNC PCM_BCLK IRQ OPEN MCU CLK SPI_ALE SPI_EN GND GND SPI_CLKIN SPI_DIN SPI_DOUT GND VRF2 GND GND GND PWRDIN OPEN PCMCLK GND VRF1 ANT C107 C135 C117 R116 R114 R113 C134 C132 C131 C128 R131 C127 R130 C126 R129 C125 R107 R127 R105 VC101 R121 C124 C116 R122 IC101 C113 C121 C104 C106 T101 F102 C101 C102 C103 C105 L107 C115 C118 GND GND OPEN GND ...

Page 95: ...TX RX IC101 ...

Page 96: ... DPS VDD 3 0V 12 RX ADPCMO 11 TX ADPCMI 9 TP_VRF 3 0V 7 Pin 32 and 33 of IC201 490mVp p 6 Pin 43 of IC201 130mVp p 1 INPUT 1 1kHz 18mVp_p 45dbm 600 8 TP_Vcc 3 3V 3 Pin 48 of IC201 140mVp_p 5 SPEAKER 270mVp_p Loud Vol Mid 4 Heddset 90mVp_p ...

Search results

Summary of Contents for KX-TC1881B

Reviews:

Related manuals for KX-TC1881B

Brands by name

Popular brands

Panasonic KX-TC1881B, Service Manual

Search results

Summary of Contents for KX-TC1881B

Reviews:

Related manuals for KX-TC1881B

Brands by name

Popular brands