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

Panasonic KX-TC1085BXB Service Manual

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Telephone Equipment
KX-TC1085BXB
Cordless Phone
Black Version
(for Asia, Middle Near East and Other areas)
© 2001 Kyusyu Matsushita Electronics CO., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. KM40110694C3
Unauthorized
copying
and

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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) © 2001 Kyusyu Matsushita Electronics CO., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.

  • Page 2: Table Of Contents

    KX-TC1085BXB CONTENTS Page Page 1 STANDARD BATTERY LIFE 12 FREQUENCY TABLE (MHz) 2 LOCATION OF CONTROLS 13 EXPLANATION OF CPU DATA COMMUNICATION 2.1. Base unit 13.1. Outgoing Call Mode (STANDBY->TALK): 2.2. Handset 13.2. CH Change Mode: 3 CONNECTIONS 13.3. To terminate Communication 3.1.
  • Page 3 KX-TC1085BXB 18.2. Receiver Signal Circuit 26 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 18.3. Transmitter Signal Circuit 18.4. Receiver Data Circuit 26.1. Base Unit 18.5. Battery Low Detector Circuit 26.2. Handset 18.6. CPU Operation 27 REPLACEMENT PARTS LIST 18.7. Reset Circuit 27.1.

  • Page 4: Standard Battery Life

    KX-TC1085BXB 1 STANDARD BATTERY LIFE...
  • Page 5 KX-TC1085BXB...

  • Page 6: Location Of Controls

    KX-TC1085BXB 2 LOCATION OF CONTROLS 2.1. Base unit...

  • Page 7: Handset

    KX-TC1085BXB 2.2. Handset...

  • Page 8: Connections

    3.1. Connecting the AC Adaptor • • 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. To prevent or reduce interference, please leave...

  • Page 9: Connecting The Telephone Line Cord

    KX-TC1085BXB 3.2. Connecting the Telephone Line Cord...

  • Page 10: Adding Another Phone

    KX-TC1085BXB 3.3. Adding Another Phone...

  • Page 11: Operation

    KX-TC1085BXB 4 OPERATION 4.1. Making Calls...
  • Page 12 KX-TC1085BXB...
  • Page 13 KX-TC1085BXB...
  • Page 14 KX-TC1085BXB...

  • Page 15: Answering Calls

    KX-TC1085BXB 4.2. Answering Calls...

  • Page 16: Flash Button

    KX-TC1085BXB 4.3. FLASH Button...

  • Page 17: Disassembly Instrucutions

    KX-TC1085BXB 5 DISASSEMBLY INSTRUCUTIONS Shown in Fig. To remove. Remove. Lower Cabinet Screws (3 × 14)......(A ) × 5 Antenna Screw (3 × 14)........( B) × 1...
  • Page 18 KX-TC1085BXB Shown in Fig. To remove. Remove. Rear Cabinet Battery cover Screws (2.6 × 14)......(C ) × 2 Antenna Screw (2.6 × 14)......(D ) × 1...

  • Page 19: Troubleshooting List

    KX-TC1085BXB 6 TROUBLESHOOTING LIST Symptom Refer to Unit for repair The base unit does not respond to a call from handset. ADJUSTMENTS (BASE UNIT) Base Unit The base unit does not transmit or the transmit frequency is off. The transmit frequency is off.

  • Page 20: Troubleshooting Guide (Base Unit)

    KX-TC1085BXB 7 TROUBLESHOOTING GUIDE (BASE UNIT) Cross Reference: Check Power (P.21). Bell Reception (P.27). Check Sp-phone Transmission (P.22). Check Sp-phone Reception (P.22). Check Battery Charge (P.23). Check Link (P.24). Check Handset Transmission (P.26). Check Handset Reception (P.26).

  • Page 21: Check Power

    KX-TC1085BXB 7.1. Check Power Cross Reference: Initializing Circuit (P.51). POWER SUPPLY BLOCK DIAGRAM (BASE UNIT) (P.44). Cross Reference: Reset Circuit (P.60).

  • Page 22: Check Sp-Phone Reception

    KX-TC1085BXB 7.2. Check Sp-phone Reception Cross Reference: Telephone Line Interface (P.50). Attenuator control (P.48). 7.3. Check Sp-phone Transmission Cross Reference: Telephone Line Interface (P.50). Attenuator control (P.48).

  • Page 23: Check Battery Charge

    KX-TC1085BXB 7.4. Check Battery Charge Cross Reference: Charge Circuit (P.52). Cross Reference: Reset Circuit (P.60).

  • Page 24: Check Link

    KX-TC1085BXB 7.5. Check Link NOTE: RF IC is IC801 CPU is IC701 *: Refer to CIRCUIT BOARD (BASE UNIT) (P.83).
  • Page 25 KX-TC1085BXB NOTE (HANDSET): RF IC is IC101 CPU is IC901 *: Refer to CIRCUIT BOARD (HANDSET) (P.85). NOTE (BASE UNIT): RF IC is IC801 CPU is IC701 **: Refer to CIRCUIT BOARD (BASE UNIT) (P.83).

  • Page 26: Check Handset Transmission

    KX-TC1085BXB 7.6. Check Handset Transmission Cross Reference: Transmitter Signal Circuit (P.58). 7.7. Check Handset Reception Cross Reference: HOW TO CHECK THE HANDSET SPEAKER (P.36). Transmitter Signal Circuit (P.58).

  • Page 27: Bell Reception

    KX-TC1085BXB 7.8. Bell Reception Cross Reference: Telephone Line Interface (P.50). Check Link (P.24). Cross Reference: Check Link (P.24).

  • Page 28: Adjustments (Base Unit)

    KX-TC1085BXB 8 ADJUSTMENTS (BASE UNIT) 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.
  • Page 29 KX-TC1085BXB The connection of adjustment equipments are as shown in CIRCUIT BOARD (BASE UNIT) (P.83).

  • Page 30: Adjustment Standard (Base Unit)

    8.1. Adjustment Standard (Base Unit) 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...

  • Page 31: Adjustments (Handset)

    KX-TC1085BXB 9 ADJUSTMENTS (HANDSET) If your unit have below symptoms, adjust each item using remedy column from the table. 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.
  • Page 32 KX-TC1085BXB The connections of adjustment equipments are as shown in CIRCUIT BOARD (HANDSET) (P.85).

  • Page 33: Adjustment Standard (Handset)

    9.1. Adjustment Standard (Handset) (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 C932 C931 D501 RA902 RINGER C507 Q912 C107 C112 C109 Q502...
  • Page 34 KX-TC1085BXB...

  • Page 35: Rf Specification

    KX-TC1085BXB 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 Line Modulation factor 3.0 kHz - 3.3 kHz —...

  • Page 36: How To Check The Handset Speaker

    KX-TC1085BXB 11 HOW TO CHECK THE HANDSET SPEAKER 1. Prepare the digital voltmeter, and set the selector knob to ohm meter. 2. Put the probes at the speaker terminals as shown below.

  • Page 37: Frequency Table (Mhz)

    KX-TC1085BXB 12 FREQUENCY TABLE (MHz)

  • Page 38: Explanation Of Cpu Data Communication

    KX-TC1085BXB 13 EXPLANATION OF CPU DATA COMMUNICATION 13.1. Outgoing Call Mode (STANDBY->TALK):...

  • Page 39: Change Mode

    KX-TC1085BXB 13.2. CH Change Mode:...

  • Page 40: To Terminate Communication

    KX-TC1085BXB 13.3. To terminate Communication 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.

  • Page 41: Ports For Transmitting And Receiving Of Data

    KX-TC1085BXB 13.5. Ports for transmitting and receiving of data Handset : transmitting ... 44 Pin receiving ... 25 Pin Base Unit : transmitting ... 10 Pin receiving ... 7 Pin 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 End data of P1.

  • Page 42: When Linking

    Base Unit during the key is pressed. 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 43: Block Diagram (Base Unit)

    14 BLOCK DIAGRAM (BASE UNIT)

  • Page 44: Power Supply Block Diagram (Base Unit)

    KX-TC1085BXB 15 POWER SUPPLY BLOCK DIAGRAM (BASE UNIT)

  • Page 45: Circuit Operation (Base Unit)

    KX-TC1085BXB 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 46: Line Sending

    KX-TC1085BXB 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. LINE 1 outputs the signal from IC402 pin 11, while LINE 2 outputs it from IC402 pin 12.

  • Page 47: Speakerphone Circuit

    KX-TC1085BXB 16.8. Speakerphone Circuit 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.
  • Page 48 KX-TC1085BXB 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 49: In Use Detector Circuit

    KX-TC1085BXB 16.9. In Use Detector Circuit 16.9.1. Function: This circuit is designed to automatically provide on LED indication when either one´s own telephone or another telephone is connected in parallel across the line is engaged. 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.

  • Page 50: Telephone Line Interface

    KX-TC1085BXB 16.10. Telephone Line Interface 16.10.1. Circuit operation: On hook 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: T →...

  • Page 51: Initializing Circuit

    KX-TC1085BXB 16.11. Initializing Circuit 16.11.1. Function: This circuit is used for to initialize the microcomputer when it incorporates an AC adaptor. 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.

  • Page 52: Charge Circuit

    KX-TC1085BXB 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.

  • Page 53: Signal Route

    KX-TC1085BXB 16.13. Signal Route Each signal route is as follows.
  • Page 54 KX-TC1085BXB...

  • Page 55: Block Diagram (Handset)

    17 BLOCK DIAGRAM (HANDSET) RECEIVING FREQUENCY 43.720~44.20MHz 1st IF 2nd IF DATA Filter Filter Filter IC101 TX Signal PRE- LINE RECEIVER 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...

  • Page 56: Circuit Operation (Handset)

    KX-TC1085BXB 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. (PLL is controlled by serial data output from Pin 28 , 29 and 30 of IC901.)An input signal from Pin 42 of IC101 and 1st Local frequency output from...

  • Page 57: Receiver Signal Circuit

    KX-TC1085BXB 18.2. Receiver Signal Circuit 18.2.1. Circuit Operation: After getting the 455kHz signal, it is input to Pin 33 of IC101 and passes through IF AMP and Detector Circuit, then are output to Pin 26 . AF signal flows through R123, C124. Its level is controlled by the VOLUME CONTROL Amp of IC101.The signal is received at Pin 25 of IC101, then it passes through the following circuits: PREAMP, Expander and Amplifier: It goes out at Pin 16 and finally is sent to the SP.Inside IC101, RX-MUTE, MIC-MUTE and PLL circuits are controlled by the serial data that the CPU send from...

  • Page 58: Transmitter Signal Circuit

    KX-TC1085BXB 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...

  • Page 59: Receiver Data Circuit

    KX-TC1085BXB 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 60: Cpu Operation

    KX-TC1085BXB 18.6. CPU Operation 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 61: Cpu Data (Base Unit)

    KX-TC1085BXB 19 CPU DATA (BASE UNIT) 19.1. IC701 19.2. CPU Option FLASH TIME 700 msec. 600 msec. 400 msec. 300 msec. 250 msec. 110 msec. 100 msec. 90 msec. D905 D906 D907 0= Without 1= With D905—D907 are used for default setting.

  • Page 62: Cpu Data (Handset)

    KX-TC1085BXB 20 CPU DATA (HANDSET) 20.1. IC901...

  • Page 63: How To Replace Flat Package Ic

    KX-TC1085BXB 21 HOW TO REPLACE FLAT 21.3. Modification Procedure of Bridge PACKAGE IC 1. Re-solder slightly on bridged portion. 21.1. Preparation 2. Remove remained solder along pins employing soldering iron as shown in below figure. • • SOLDER Sparkle Solder 115A-1, 115B-1 or Almit Solder KR-19,KR- 19RMA •...

  • Page 64: Explanation Of Ic Terminals

    KX-TC1085BXB 22 EXPLANATION OF IC TERMINALS 22.1. Base Unit: IC801...

  • Page 65: Handset: Ic101

    KX-TC1085BXB 22.2. Handset: IC101...

  • Page 66: Cabinet And Electrical Parts Location (Base Unit)

    KX-TC1085BXB 23 CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT)

  • Page 67: Cabinet And Electrical Parts Location (Handset)

    KX-TC1085BXB 24 CABINET AND ELECTRICAL PARTS LOCATION (HANDSET)

  • Page 68: Accessories And Packing Materials

    KX-TC1085BXB 25 ACCESSORIES AND PACKING MATERIALS...

  • Page 69: Terminal Guide Of The Ics Transistors And Diodes

    KX-TC1085BXB 26 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 26.1. Base Unit 26.2. Handset...

  • Page 70: Replacement Parts List

    KX-TC1085BXB 27 REPLACEMENT PARTS Ref. Part No. Part Name & Description Remarks PQQT22096Z ADAPTOR LABEL LIST PQSA10092Y ANTENNA PQSX10091X 20 KEY BUTTON, RUBBER Note: PQSX10107Z 4 KEY BUTTON, RUBBER PQYF10154H1 LOWER CABINET 1. RTL (Retention Time Limited) The marking (RTL) indicates that the Retention Time is 27.1.2.
  • Page 71 KX-TC1085BXB Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks D311 MA111 DIODE(SI) R106 PQ4R10XJ102 D312 MA111 DIODE(SI) R107 PQ4R10XJ103 D313 MA111 DIODE(SI) R108 PQ4R10XJ330 D314 MA111 DIODE(SI) R109 ERJ3GEYJ183 D351 MA4300 DIODE(SI)
  • Page 72 KX-TC1085BXB Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R262 ERJ3GEYJ122 1.2k R653 ERJ3GEYJ473 R263 ERJ3GEYJ183 R655 ERJ3GEYJ223 R302 ERDS2TJ271 R658 ERJ3GEYJ153 R310 ERJ3GEYJ104 100k R659 ERJ3GEYJ123 R311 ERJ3GEYJ104 100k R660 ERJ3GEYJ333...
  • Page 73 KX-TC1085BXB Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C117 ECUV1H562KBV 0.0056 C617 ECEA1AU221 C118 ECQE2224KF 0.22 C618 PQCUV1C105KB C119 ECUV1H103KBV 0.01 C619 ECUV1A105ZFV C120 ECUV1C473KBV 0.047 C620 ECEA1AKA101 C121 ECEA1AU221 C621...

  • Page 74: Handset

    KX-TC1085BXB Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C841 ECUV1H180JCV LED904 PQVDEL1921SR C842 ECUV1H103KBV 0.01 LED911 PQVDSML310MT C843 ECUV1H103KBV 0.01 LED912 PQVDSML310MT C844 ECUV1C104KBV LED913 PQVDSML310MT C845 ECUV1C104KBV LED914 PQVDSML310MT C851 ECUV1C563KBV 0.056...

  • Page 75: Accessories And Packing Materials

    KX-TC1085BXB Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R505 ERJ3GEYJ472 4.7k C317 ECUV1H103KBV 0.01 R506 ERJ3GEYJ103 C321 ECUV1H220JCV R905 ERJ3GEYJ224 220k C322 ECUV1H150JCV R906 ERJ3GEYJ104 100k C323 ECUV1H681JCV 680P R907 ERJ3GEYJ104...

  • Page 76: For Schematic Diagram

    KX-TC1085BXB 28 FOR SCHEMATIC DIAGRAM 28.1. Base Unit (SCHEMATIC DIAGRAM (Base Unit)) Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. 2. This schematic diagram and circuit board may be modified at any time with the development of new technology.

  • Page 77: Memo

    KX-TC1085BXB 28.3. MEMO...

  • Page 78: Schematic Diagram

    KX-TC1085BXB 29 SCHEMATIC DIAGRAM 29.1. BASE UNIT 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...
  • Page 79 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 80: Handset

    KX-TC1085BXB 29.2. HANDSET 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 81 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 82 KX-TC1085BXB...
  • Page 83 KX-TC1085BXB KXTC1085BXB...

  • Page 84: Circuit Board (Base Unit)

    KX-TC1085BXB 30 CIRCUIT BOARD (BASE UNIT) 30.1. Component View...

  • Page 85: Flow Solder Side View

    KX-TC1085BXB 30.2. Flow Solder Side View IC802 IC201 IC101...

  • Page 86: Circuit Board (Handset)

    KX-TC1085BXB 31 CIRCUIT BOARD (HANDSET) 31.1. Component View 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 R109 C127 VR202 X901 C104 R123 C124...

  • Page 87: Flow Solder Side View

    KX-TC1085BXB 31.2. Flow Solder Side View LED901 R104 R105 C506 C106 J101 C103 C153 R106 C105 R153 R122 R120 LED902 TALK R102 R152 R101 C129 C120 C152 R103 C510 C149 C123 C121 R151 LED913 LED911 C102 C101 C122 C151 J110...

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