Panasonic KX-TC1085BXB Service Manual
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Panasonic KX-TC1085BXB Service Manual

Panasonic KX-TC1085BXB Service Manual

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ORDER NO. KM40110694C3
Telephone Equipment
KX-TC1085BXB
Cordless Phone
Black Version
(for Asia, Middle Near East and Other areas)
SPECIFICATIONS
1

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Summary of Contents for Panasonic KX-TC1085BXB

  • Page 1 ORDER NO. KM40110694C3 Telephone Equipment KX-TC1085BXB Cordless Phone Black Version (for Asia, Middle Near East and Other areas) SPECIFICATIONS...

  • Page 2: Standard Battery Life

    2001 Kyusyu Matsushita Electronics CO., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1. STANDARD BATTERY LIFE...

  • Page 4: Location Of Controls

    2. LOCATION OF CONTROLS 2.1. Base unit...
  • Page 5 2.2. Handset...
  • Page 6 3. CONNECTIONS 3.1. Connecting the AC Adaptor...
  • Page 7 - USE ONLY WITH Panasonic AC ADAPTOR PQLV14BXZ. - The AC adaptor must remain connected at all times. (It is normal for the adaptor to feel warm during use.) - When more than one unit is used, the units may interfere with each other.

  • Page 9: Operation

    3.3. Adding Another Phone 4. OPERATION 4.1. Making Calls...

  • Page 12: Answering Calls

    4.2. Answering Calls...
  • Page 13 4.3. FLASH Button...

  • Page 14: Disassembly Instrucutions

    5. DISASSEMBLY INSTRUCUTIONS...
  • Page 15 Shown in Fig. To remove. Remove. Lower Cabinet Screws (3 × 14)......(A) × 5 Antenna Screw (3 × 14)........(B) × 1...

  • Page 16: Troubleshooting List

    Shown in Fig. To remove. Remove. Battery cover Rear Cabinet Screws (2.6 × 14)......(C) × 2 Antenna Screw (2.6 × 14)......(D) × 1 6. TROUBLESHOOTING LIST...
  • Page 17 Symptom Refer to Unit The base unit does not respond to a call from handset. ADJUSTMENTS (BASE UNIT) Base The base unit does not transmit or the transmit frequency is off. The transmit frequency is off. The transmit power output is low, and the operating distance between base unit and handset is less than normal.

  • Page 18: Check Power

    Cross Reference: Check Power Bell Reception Check Sp-phone Transmission Check Sp-phone Reception Check Battery Charge Check Link Check Handset Transmission Check Handset Reception 7.1. Check Power...

  • Page 19: Check Sp-Phone Reception

    Cross Reference: Initializing Circuit POWER SUPPLY BLOCK DIAGRAM (BASE UNIT) Cross Reference: Reset Circuit 7.2. Check Sp-phone Reception...

  • Page 20: Check Sp-Phone Transmission

    Cross Reference: Telephone Line Interface Attenuator control 7.3. Check Sp-phone Transmission Cross Reference: Telephone Line Interface Attenuator control 7.4. Check Battery Charge Cross Reference: Charge Circuit...

  • Page 21: Check Link

    Cross Reference: Reset Circuit 7.5. Check Link NOTE: RF IC is IC801 CPU is IC701 *: Refer to CIRCUIT BOARD (BASE UNIT)

  • Page 22: Check Handset Transmission

    NOTE (HANDSET): RF IC is IC101 CPU is IC901 *: Refer to CIRCUIT BOARD (HANDSET) NOTE (BASE UNIT): RF IC is IC801 CPU is IC701 **: Refer to CIRCUIT BOARD (BASE UNIT) 7.6. Check Handset Transmission...

  • Page 23: Check Handset Reception

    Cross Reference: Transmitter Signal Circuit 7.7. Check Handset Reception Cross Reference: HOW TO CHECK THE HANDSET SPEAKER Transmitter Signal Circuit 7.8. Bell Reception Cross Reference: Telephone Line Interface Check Link Cross Reference: Check Link 8. ADJUSTMENTS (BASE UNIT)
  • Page 24 If your unit have below symptoms, adjust each item using remedy column from the table. Symptom Remedy The base unit dose not respond to a call from handset. Make adjustments in item (A) The base unit dose not transmit or the transmit frequency is off. Make adjustments in item (B) The transmit frequency is off.

  • Page 25: Adjustment Standard (Base Unit)

    The connection of adjustment equipments are as shown in CIRCUIT BOARD (BASE UNIT) 8.1. Adjustment Standard (Base Unit) 9. ADJUSTMENTS (HANDSET) If your unit have below symptoms, adjust each item using remedy column from the table.
  • Page 26 Symptom Remedy The movement of Battery Low Indicator is wrong. Make confirmation in item (A) The base unit does not respond to a call from handset. Make adjustment in item (B) The base unit does not transmit or the transmit frequency is off. Make adjustment in item (C) The transmit frequency is off.

  • Page 27: Adjustment Standard (Handset)

    The connections of adjustment equipments are as shown in CIRCUIT BOARD (HANDSET) 9.1. Adjustment Standard (Handset) 10. RF SPECIFICATION 10.1. BASE UNIT Item Value Refer to -. Remarks TX Frequency 44.200 MHz ± 700Hz ADJUSTMENTS (BASE UNIT) at CH10 TX Power More than 1000mV (CH10) ADJUSTMENTS (BASE UNIT) at CH10...

  • Page 28: How To Check The Handset Speaker

    Cross Reference : ADJUSTMENTS (BASE UNIT) 10.2. HANDSET Item Value Refer to -. Remarks Practical Sensitivity Less than 9 dB — at CH10 TX Frequency 49.970 MHz ± 700Hz ADJUSTMENTS at CH10 (HANDSET) TX Power Over 700 mV ADJUSTMENTS at CH10 (Antenna soldering point (HANDSET) Load) Data Modulation...

  • Page 30: Frequency Table (Mhz)

    12. FREQUENCY TABLE (MHz) 13. EXPLANATION OF CPU DATA COMMUNICATION 13.1. Outgoing Call Mode (STANDBY->TALK):...
  • Page 31 13.2. CH Change Mode: 13.3. To terminate Communication...

  • Page 32: Ports For Transmitting And Receiving Of Data

    13.4. Ringing After detecting the Ring signal from circuit, Base Unit sends a ring signal DATA (Ring) on the base's (a) TX frequency, then the Handset starts ringing. Note: (a) is channels 1-10 (old)...cthese channels are paired. 13.5. Ports for transmitting and receiving of data Handset : transmitting ...

  • Page 33: Waveform Of Data Used For Cordless Transmission And Reception

    13.6. Waveform of DATA used for cordless transmission and reception The DATA which is transmitted from the Handset to the Base Unit is combination of DATA 0, DATA 1, DATA Delimt, Pre data and End data of P1. The DATA which is transmitted from the Base Unit to the Handset is combination of DATA 0, DATA 1, DATA Delimt, Pre data and End data of P2.

  • Page 34: Pulse Dial

    When depressing the key, and the END data is sent finally. NOTE A million kinds of the security code are available for the model KX-TC1085BXB. Each time the handset is set on the cradle of the base unit (for charging), the CPU automatically change the security code.

  • Page 35: Circuit Operation (Base Unit)

    15. POWER SUPPLY BLOCK DIAGRAM (BASE UNIT) 16. CIRCUIT OPERATION (BASE UNIT) 16.1. Transmitter Circuit The voice signal or the data signal sent to the handset is applied in the anode of the variable capacitor diode (VARICAP) D805. VR802 is used for changing the voice signal level, thus changing the modulation level.

  • Page 36: Bell Detector Circuit

    16.2. Transmitter Output Amp Circuit The signal which is oscillated at TXVCO is amplified by DUP802, whose gain is adjusted by moving T892.The signal passes through the duplexer and it is radiated from the antenna. 16.3. Bell Detector Circuit When the Bell signal is input between T/R, the signal of which waveform is shaped through C118 R123 PC102 (C215...

  • Page 37: Speakerphone Circuit

    16.6. Line Sending The AF signal from IC801 pin 26 is input to pin 24 and output from pin 21, input to pin 17 then output from pin 16. The level of the signal is adjusted at VR801. After being amplified at Q401, the signal is input to IC402 pin 7.
  • Page 38 16.8.1. Function: This circuit controls the automatic switching of the transmitted and received signals, to and from the telephone line, when the unit is used in the hands-free mode. 16.8.2. Circuit operation: The speakerphone can only provide a one-way communication path. In other words, it can either transmit an outgoing signal or receive an incoming signal at a given time, but cannot do both simultaneously.
  • Page 39 Comparator output is connected to the attenuator control inside of IC601. 16.8.2.4. Voice detector The output of the mic amp Pin 10 of IC601 is supplied to Pin 14 of IC601 as a control signal for the voice detector. 16.8.2.5. Attenuator control The attenuator control detects the setting of the volume control through Pin 25 of IC601 to automatically adjust for changing ambient conditions.

  • Page 40: Telephone Line Interface

    16.9.2. Circuit operation: When the circuit voltage is more than 30 V by mode A or more than 20 V by mode B, the unit and telephone are ON Hook. When the circuit voltage is less than 25 V by mode A or less than 16 V by mode B, the unit and telephone are OFF-Hook.
  • Page 41 Q101(Q201)* is open, Q101(Q201)* is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-hook condition. Bell detect In the idle mode, Q101(Q201)* is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T) and Ring (R) leads (when the telephone rings),the AC ring voltage is transferred as follows: POS101...
  • Page 42 16.11.2. Circuit operation: When the AC Adaptor is inserted into the unit, then the voltage is shifted by D309 and power is supplied to the CPU. The set can operate beyond point A in the circuit voltage diagram.

  • Page 43: Charge Circuit

    16.12. Charge Circuit Circuit Operation: When charging the handset on the base unit, the charge current is as follows; DC+(12V) L351 CHG (Base) [JT+ (Handset) L503 D501 CN1-2..Battery..CN1-1 JT- (Handset)] CHG- (Base) L353 R352 DC-(GND), In this way, the CPU on both unit detects the fact that the battery is charged. The charge current is controlled by switching Q353 (Base).

  • Page 44: Signal Route

    16.13. Signal Route Each signal route is as follows.
  • Page 46 17. BLOCK DIAGRAM (HANDSET) 18. CIRCUIT OPERATION (HANDSET) 18.1. Receiver RF IF Circuit 18.1.1. Circuit Operation: The signal of 46 MHz band (43.72 MHz~44.20 MHz) which is input from ANT is filtered by DUP101, and is input to Pin 42of IC101.The RX VCO which oscillates at T201 and IC101 is locked to 1st Local frequency by PLL inside IC101.
  • Page 47 VCO are mixed inside IC101, pass through CF1, and 1st IF frequency of 10.695 MHz is generated.Further, 10.695 MHz and 10.240 MHz that oscillated at X101, passes through MIXER inside IC101 and is filtered at CF2 and outputs 2nd IF 455 kHz. 18.2.
  • Page 48 18.3. Transmitter Signal Circuit 18.3.1. Circuit Operation: Input signal from MIC passes through the filters arranged by C202, VR201, R201 and C203, R203 and it is input to the Pin 9 of IC101.Inside it, the signal passes through the MIC AMP and Compressor circuits and SPLATTER FILTER is output to Pin 3.It flows through R204, C221, R221, then is input to modulator circuit.
  • Page 49 18.4. Receiver Data Circuit 18.4.1. Circuit Operation: Only the data received are passed through the low pass filter formed by R216 and C129 to be input at pin 22 of IC101,where its wave form is adjusted.The resulting signal is output from Pin 13 and sent to CPU directly.

  • Page 50: Cpu Operation

    18.5. Battery Low Detector Circuit 18.5.1. Circuit Operation: When the battery voltage goes down less than 3.45 V. this level is detected by the inside of IC101, so its output is sent to Pin 26 of IC901.The CPU detects this level by its Pin 26 and battery low indicator lights starts flashing.The IC101 check the level of the battery, if this level is less than 3.3 V, the output of Pin 11 of IC101, then CPU stopsworking to keep the data (CH number ID code, etc.).

  • Page 51: Reset Circuit

    18.7. Reset Circuit When the handset is charged, the impulse is sent through C905, Q910 generates the reset signal and it is sent to Pin 20 of CPU.

  • Page 52: Cpu Data (Base Unit)

    19. CPU DATA (BASE UNIT) 19.1. IC701 19.2. CPU Option FLASH TIME 700 600 msec. 400 300 msec. 250 100 msec. 90 msec. msec. msec. msec. msec. D905 D906 D907 D905—D907 are used for default setting. When you change the flash time, do the following procedure. In case the program should be set frequency, change the default at D905—D907, then set the...

  • Page 53: Cpu Data (Handset)

    program. 20. CPU DATA (HANDSET) 20.1. IC901 21. HOW TO REPLACE FLAT PACKAGE IC 21.1. Preparation - SOLDER / Sparkle 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 ±...
  • Page 54 but beginner might damage foil by overheating.) - Flux / HI115 Specific gravity 0.863 / (Original flux will be replaced daily.) 21.2. Procedure 1. Temporary fix FLAT PACKAGE IC by soldering on two marked 2 pins. *Most important matter is accurate setting of IC to the corresponding soldering foil.

  • Page 55: Explanation Of Ic Terminals

    22. EXPLANATION OF IC TERMINALS 22.1. Base Unit: IC801...

  • Page 56: Cabinet And Electrical Parts Location

    22.2. Handset: IC101 23. CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT)
  • Page 57 24. CABINET AND ELECTRICAL PARTS LOCATION (HANDSET)

  • Page 58: Accessories And Packing Materials

    25. ACCESSORIES AND PACKING MATERIALS...

  • Page 59: Terminal Guide Of The Ics, Transistors And Diodes

    26. TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 26.1. Base Unit 26.2. Handset...

  • Page 60: Replacement Parts List

    27. REPLACEMENT PARTS LIST Note: 1. RTL (Retention Time Limited) The marking (RTL) indicates that the Retention Time is limited for this item. After the discontinuation of this assembly in production, the item will continue to be available for a specific period of time. The retention period of availability depends on the type of assembly and the laws governing parts and product retention.
  • Page 61 27.1. Base Unit 27.1.1. CABINET AND ELECTRICAL PARTS Ref. No. Part No. Part Name & Description Remarks PQAS57P03Z SPEAKER PQGT14931Z NAME LABEL PQHR10678X LED LENSE PQJT10151X CHARGE TERMINAL PQKE10082Z1 HOOK LEVER PQKM10447WA UPPER CABINET PQQT11773Z CHARGE LABEL PQQT11859Z ADAPTOR LABEL PQQT22096Z ADAPTOR LABEL PQSA10092Y...
  • Page 62 Ref. No. Part No. Part Name & Description Remarks PCB1 PQWPC1085BXH MAIN P.C.BOARD ASS'Y (RTL) (ICS) IC101 PQVINJM2904F IC201 PQVINJM2904F IC301 PQVIBA78M08F IC303 PQVIPS3442UT IC402 PQVIBU8244F IC601 PQVISC77655V IC701 C2CBFE000008 IC801 AN6266FA IC802 PQVITK14620M (TRANSISTORS) Q101 2SA1625 TRANSISTOR(SI) Q102 2SC2120 TRANSISTOR(SI) Q103 2SD601A...
  • Page 63 Ref. No. Part No. Part Name & Description Remarks D302 MA4300 DIODE(SI) D303 MA4062 DIODE(SI) D304 MA111 DIODE(SI) D305 MA111 DIODE(SI) D306 MA111 DIODE(SI) D307 MA111 DIODE(SI) D308 MA111 DIODE(SI) D309 MA111 DIODE(SI) D310 MA111 DIODE(SI) D311 MA111 DIODE(SI) D312 MA111 DIODE(SI) D313...
  • Page 64 Ref. No. Part No. Part Name & Description Remarks DUP802 ELB6F026 DUPLEX (SURGE ABSORBERS) SA101 PQVDDSS301L SURGE ABSORBER SA102 PQVDDSS301L SURGE ABSORBER SA201 PQVDDSS301L SURGE ABSORBER SA202 PQVDDSS301L SURGE ABSORBER (VARIABLE RESISTORS) VR101 EVN5ESX50B54 VARIABLE RESISTOR VR102 EVN5ESX50B54 VARIABLE RESISTOR VR801 EVN5ESX50B54 VARIABLE RESISTOR...
  • Page 65 R138 ERJ3GEYJ102...
  • Page 66 Ref. No. Part No. Part Name & Description Remarks R139 ERJ3GEYJ101 R150 ERJ3GEYJ102 R151 ERJ3GEYJ393 R152 ERJ3GEYJ122 1.2k R153 ERJ3GEYJ273 R154 ERJ3GEYJ104 100k R155 ERJ3GEYJ824 820k R156 ERJ3GEYJ824 820k R157 ERJ3GEYJ103 R158 ERJ3GEYJ183 R159 ERJ3GEYJ683 R161 PQ4R10XJ825 8.2M R162 PQ4R10XJ825 8.2M R201 PQ4R10XJ106...
  • Page 67 Ref. No. Part No. Part Name & Description Remarks R315 ERJ3GEYJ104 100k R316 ERJ3GEYJ102 R351 ERJ3GEYJ473 R352 ERDS2TJ122 1.2k R354 PQ4R10XJ101 R355 PQ4R10XJ560 R357 ERJ3GEYJ103 R358 ERJ3GEYJ391 R359 PQ4R10XJ473 R360 ERJ3GEYJ103 R361 ERJ3GEYJ104 100k R362 ERJ3GEYJ104 100k R364 ERJ3GEYJ102 R441 ERJ3GEYJ472 4.7k R442...
  • Page 68 Ref. No. Part No. Part Name & Description Remarks R630 ERJ3GEYJ392 3.9k R631 ERJ3GEYJ224 220k R632 ERJ3GEYJ224 220k R638 ERJ3GEYJ473 R639 ERJ3GEYJ393 R641 ERJ3GEYJ104 100k R642 ERJ3GEYJ334 330k R643 ERJ3GEYJ104 100k R645 ERJ3GEYJ563 R646 ERJ3GEYJ333 R651 ERJ3GEYJ103 R652 ERJ3GEYJ103 R653 ERJ3GEYJ473 R655 ERJ3GEYJ223...
  • Page 69 Ref. No. Part No. Part Name & Description Remarks R851 ERJ3GEYJ103 R852 ERJ3GEYJ154 150k R853 ERJ3GEYJ563 R854 ERJ3GEYJ274 270k R855 ERJ3GEYJ564 560k R856 ERJ3GEYJ223 R857 ERJ3GEYJ104 100k R858 ERJ3GEYJ102 R859 ERJ3GEYJ220 R860 PQ4R10XJ470 R861 ERJ3GEYJ123 R862 ERJ3GEYJ101 R864 ERJ3GEYJ101 R881 ERJ3GEYJ680 R884 ERJ3GEYJ222...
  • Page 70 Ref. No. Part No. Part Name & Description Remarks C214 ECEA1CKA100 C215 ECQE2224KF 0.22 C216 ECUV1C273KBV 0.027 C217 ECUV1H151JCV 150P C220 ECUV1H562KBV 0.0056 C221 ECEA1AU221 C222 ECUV1H151JCV 150P C233 ECUV1H222KBV 0.0022 C250 ECUV1C104KBV 0.1 C251 ECUV1C104KBV 0.1 C253 ECUV1C104KBV 0.1 C254 ECUV1H220JCV C303...
  • Page 71 Ref. No. Part No. Part Name & Description Remarks C621 ECEA1CU471 C622 ECUV1E333KBV 0.033 C623 ECUV1H122KBV 0.0012 C624 ECUV1H103KBV 0.01 C625 ECUV1H103KBV 0.01 C626 ECUV1H103KBV 0.01 C627 ECUV1C104KBV 0.1 C628 ECUV1H331JCV 330P C629 ECUV1H103KBV 0.01 C630 ECUV1H102KBV 0.001 C632 PQCUV1C104KB 0.1 C633 ECUV1C104KBV 0.1 C635...
  • Page 72 Ref. No. Part No. Part Name & Description Remarks C826 ECUV1C104ZFV C827 ECEA1EU470 C828 ECUV1E333KBV 0.033 C829 ECUV1C104ZFV C830 ECUV1H101JCV 100P C831 ECUV1C104KBV 0.1 C832 ECUV1H152KBV 0.0015 C833 ECUV1H151JCV 150P C834 ECUV1C104KBV 0.1 C835 ECUV1H430GCV 43P C836 ECUV1H270GCV 27P C837 ECUV1H103KBV 0.01 C838 ECEA1CKA100...
  • Page 73 Ref. No. Part No. Part Name & Description Remarks PQAX3P27Z RECEIVER PQFJ4Z EARTH TERMINAL PQGT14932Z NAME LABEL PQHG10527Y SHEET, RUBBER PQHR10639Z SP HOLDER PQHR10640W LED LENSE PQJT10150Z CHARGE TERMINAL PQKF10277S1 REAR CABINET PQKK10089Z1 BATTERY COVER PQKM10435PG FRONT CABINET PQMH10372Z WEIGHT PQSA10091Z ANTENNA PQSX10092G...
  • Page 74 Ref. No. Part No. Part Name & Description Remarks L504 PQLQZM1R0K COIL L901 PQLQZMR68M COIL T201 PQL04B003 COIL T301 PQL04B004 COIL (CRYSTAL OSCILLATORS) X101 H0D102500025 CRYSTAL OSCILLATOR X102 PQVCJ3991N9Z CRYSTAL OSCILLATOR X901 PQVCL3276N9Z CRYSTAL OSCILLATOR (DUPLEXES) DUP101 ELB6A002 DUPLEX DUP301 ELB6A001 DUPLEX (RESISOTOR ARRAYS)
  • Page 75 Ref. No. Part No. Part Name & Description Remarks R324 ERJ3GEYJ684 680k R351 ERJ3GEYJ472 4.7k R352 ERJ3GEYJ333 R353 ERJ3GEYJ473 R501 ERJ3GEYJ562 5.6k R502 ERJ3GEYJ104 100k R503 ERJ3GEYJ562 5.6k R505 ERJ3GEYJ472 4.7k R506 ERJ3GEYJ103 R905 ERJ3GEYJ224 220k R906 ERJ3GEYJ104 100k R907 ERJ3GEYJ104 100k R910...
  • Page 76 Ref. No. Part No. Part Name & Description Remarks C130 ECUV1C473KBV 0.047 C131 PQCUV1C104KB 0.1 C132 ECUV1H272KBV 0.0027 C141 ECUV1H270GCV 27P C142 ECUV1H390GCV 39P C150 ECUV1H240JCV C151 ECUV1H103KBV 0.01 C152 PQCUV1C224ZF 0.22 C153 ECUV1H103KBV 0.01 C155 ECEA1CKA100 C156 PQCUV1E473MD 0.047 C157 PQCUV1E104MD 0.1 C201...

  • Page 77: For Schematic Diagram

    Ref. No. Part No. Part Name & Description Remarks PQJA10088Z TEL CORD, PLUG PQJA10075Z TEL CORD PQLV14BXZ AC ADAPTOR PQQW12520Z QUICK GUIDE (for Arabic) PQQX13214Z INSTRUCTION BOOK PQHX11112Z PET SHEET PQPP170Y POLY BAG (for Base Unit) XZB10X35A02 POLY BAG (for Handset) PQPK13545Z CARTON BOX PQPD10440Y...

  • Page 78: Circuit Board (Base Unit)

    30. CIRCUIT BOARD (BASE UNIT) 30.1. Component View 30.2. Flow Solder Side View 31. CIRCUIT BOARD (HANDSET) 31.1. Component View 31.2. Flow Solder Side View M / KXTC1085BXB...
  • Page 79 R913 R906 R914 R915 L503 Q911 C915 R905 C511 T210 R506 C932 C931 D501 RA902 RINGER C507 Q912 C107 C112 C109 Q502 R907 R505 IC801 R109 C127 VR202 X901 C104 C108 C111 R123 C124 C150 C933 R503 T201 C912 R502 D512 R125 R124 C502...
  • Page 80 LED901 R104 R105 C506 C106 J101 C103 C153 R106 C105 R153 R122 R120 LED902 TALK R102 R152 R101 C129 C120 C152 R103 C149 C510 C123 C121 R151 LED913 LED911 C102 C101 C122 C151 J110 R126 R121 R351 LED903 R352 AUTO C141 C100 R925...
  • Page 81 DC VOLTAGE TALK STBY TALK STBY 3.56 3.87 (3.90) (2.1) 3.59 (3.63) (2.1) 3.87 (3.90) 3.57 (3.59) -16dBm -20dBm -20dBm -23dBm (Vol Med) IC101 -14.5dBm -20dBm 3.83 (0.2) 3.66 3.79 (0.2) (0.2) IC301 90mV 0.84 RF 900mV...
  • Page 82 DC VOLTAGE 3kHz Dev Input 1kHz Mod Mic Input -40dBm/600 ,1kHz 3.90 (3.90) IC801 3.90 IC901 DC VOLTAGE (2.1) Details of Option Option Diode Contents None Provided 8 → 2 D911 TALK Time 8 Hours 6 Hours KX-TC1085BXB: SCHEMATIC DIAGRAM (HANDSET)
  • Page 83 DC VOLTAGE 3kHz Dev Input 1kHz Mod Mic Input -40dBm/600 ,1kHz 3.90 (3.90) IC801 3.90 IC901 DC VOLTAGE (2.1) Details of Option Option Diode Contents None Provided 8 → 2 D911 TALK Time 8 Hours 6 Hours KX-TC1085BXB: SCHEMATIC DIAGRAM (HANDSET)
  • Page 84 IC801 DC voltage (TALK) No. Voltage No. Voltage No. Voltage No. Voltage No. Voltage No. Voltage No. Voltage No. Voltage IC402 IC402 DC voltage No. Voltage No. Voltage INT SP OUT IC801 INTCOM MIC 4.5V 4.5V 5.1V 7.1V 8.0V 0.8V 7.0V IC802 0.9V...
  • Page 85 1.9V 0.7V 0.7V 0.5V 0.7V 3.6V 0.5V 5.1V 5.5V 5.1V 1.1V 5.1V IC301 SP-PHONE: ON 5.8V 8.0V IC601 6.4V (6.2~6.6)V 12.6V 5.7V 5.0V Charging 10.2V 5.0V 5.3V 5.3V 1.6V 1.0V IC303 0/5.0V OFF 4.9V 0.6V KX-TC1085BXB: SCHEMATIC DIAGRAM (BASE UNIT)
  • Page 86 1.9V 0.7V 0.7V 0.5V 0.7V 3.6V 0.5V 5.1V 5.5V 5.1V 1.1V 5.1V IC301 SP-PHONE: ON 5.8V 8.0V IC601 6.4V (6.2~6.6)V 12.6V 5.7V 5.0V Charging 10.2V 5.0V 5.3V 5.3V 1.6V 1.0V IC303 0/5.0V OFF 4.9V 0.6V KX-TC1085BXB: SCHEMATIC DIAGRAM (BASE UNIT)
  • Page 88 IC802 IC201 IC101...
  • Page 89 TX VCO For check of conference LINOT Oscilloscope Modulation Analyzer D.M.M. S.G. RX VCO For check of conference High_ TP401 Frequency_SW Spectrum Analyzer D.M.M. Volt Meter INT key RXPD TXPD Frequency Counter Test Mode For multi dummy Test Mode Oscilloscope UP key TESTG TEST...
  • Page 90 (Component View) TX ANT RF.V.V Frequency Counter Ni-Cd Battery SIG-OUT Linear Detector DC-Voltmeter RX GND RF-S.G. RX ANT R913 R906 R914 R915 L503 Q911 C915 R905 C511 T210 R506 D501 RA902 C932 C931 RINGER Q912 C507 C107 C112 C109 Q502 R907 R505 IC801...
  • Page 91 (Flow Solder Side View) 455 GND RF VOLT METER 455 OUT LED901 R104 R105 C506 C106 J101 C103 C153 R106 C105 R153 R122 R120 LED902 TALK R102 R152 R101 C129 C120 R103 C152 C510 C149 C123 C121 R151 LED913 LED911 C102 C101 C122 C151...
  • Page 92 RECEIVING FREQUENCY 43.720~44.20MHz 1st IF 2nd IF DATA Filter Filter Filter IC101 TX Signal RECEIVER PRE- LINE RX Filter EXPANDER IF AMP Mixer Mixer 33.025 ~33.505MHz DATA Local RX Signal X201 BATT LOW DET 2nd Local 10.240MHz 10.24MHz /POWER DOWN COMPRESSOR LIMITTER Battery...

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