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Kenwood KCH-20R, Service Manual

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Kenwood KCH-20R Service Manual Download Page 7

(No.RA027<Rev.001>)1-7

Fig.1  Power supply diagram

External Interface

XC3-011

Level shift circuits,
Audio circuits

MPU core

Flash memory

CAN transceiver,

Flash memory, 
Bluetooth circuits

CAN transceiver

Modular Interface

XC3-010

CN5

SB

IC1

5.4V DC/DC

53DC

CN13

CN1

Class-D Audio Amplifier

18D

IC8

5V AVR

53DC

50D

SB

12D

39DC

IC2

3.9V DC/DC

12D

Q1

Level shift

A1

1.2V DC/DC

IC5

1.8V DC/DC

18D

IC10

Switch

18D_Flash

33D

IC6

3.3V AVR

33D

18D

18D

18D

“33SDC”

3.3V AVR

IC9

33SD

SD Circuit

LCD module

30LCD

IC3

3.0V AVR

3.3V AVR

IC4

33A

Audio circuits,
Codec Analog section

MPU I/O,CodecI/O,

MPU,Mobile DDR,
Codec DSP, 
Bluetooth circuits

Key backlight/LED indicator

Summary of Contents for KCH-20R

Page 1: ... 001 2015 6 SERVICE MANUAL B5B 7206 00 KCH 20R COPYRIGHT 2015 JVC KENWOOD Corporation TABLE OF CONTENTS 1 PRECAUTION 1 2 2 SPECIFIC SERVICE INSTRUCTIONS 1 3 3 DISASSEMBLY 1 13 4 ADJUSTMENT 1 13 5 TROUBLESHOOTING 1 14 This product complies with the RoHS directive for the European market This product uses Lead Free solder ...

Page 2: ...s manual JVC KENWOOD Corporation assumes no responsibility for errors or omissions Neither is any liability assumed for damages resulting from the use of the information contained herein JVC KENWOOD Corporation reserves the right to make changes to any products herein at any time for improvement purposes Bluetooth Copyrights The Bluetooth word mark and logos are registered trademarks owned by Blue...

Page 3: ...e flat cable from the display unit connector CN6 of the panel 3 Remove the cable from the display unit connector CN2 of the panel 2 1 5 Install the KRK 15B onto the NX 5700 NX 5800 RF Deck 1 Insert the cable into the interface unit XC3 0090 20 con nector CN2 of the KRK 15B 2 Insert the flat cable into the interface unit connector CN1 of the KRK 15B Fig 2 Fig 2 Note The blue line of the flat cable ...

Page 4: ... installing of the cable bush Fig 5 3 Slide the molding cover so as not to float the waterproof packing and attach so that it is locked Fig 6 Fig 6 4 Insert the other lead wire with connector of the KCT 71 into the connector CN5 of the KCH 20R Fig 7 Fig 7 5 Attach the waterproof packing and molding cover in the same way of step 2 and 3 Fig 8 Fig 9 Fig 8 Fig 9 KCT 71 lead wire with connector KRK 15...

Page 5: ...under use environment Microphone can be used without this mounting hardware Microphone cord should be fixed so that the curl portion is lower side Refer to the following figs Fig 10 Fig 11 Fig 12 PAN HEAD SEMS SCREW N67 3006 43 MOUNTING HARDWARE J2B 0051 00 Fixing the Microphone cord NG Curly cord upper side OK Curly cord lower side ...

Page 6: ...or all DC DC and regulators except for IC1 53DC IC2 39DC A1 regulates 39DC to 1 2V 12D and 12D provides the power to MPU core IC5 outputs 1 8V 18D while 12D is operating 18D provides the power to MPU I O DDR Codec DSP and enables each regula tor IC3 IC4 IC6 18D_Flash is the power supply for Flash memory After 33D turns on IC10 switch IC operates and 18D_Flash starts working IC8 regulates 5 36V 53D...

Page 7: ... CN5 SB IC1 5 4V DC DC 53DC CN13 CN1 Class D Audio Amplifier 18D IC8 5V AVR 53DC 50D SB 12D 39DC IC2 3 9V DC DC 12D Q1 Level shift A1 1 2V DC DC IC5 1 8V DC DC 18D IC10 Switch 18D_Flash 33D IC6 3 3V AVR 33D 18D 18D 18D 33SDC 3 3V AVR IC9 33SD SD Circuit LCD module 30LCD IC3 3 0V AVR 3 3V AVR IC4 33A Audio circuits Codec Analog section MPU I O CodecI O MPU Mobile DDR Codec DSP Bluetooth circuits Ke...

Page 8: ... these two microphone signals are selected by analog multiplexer IC IC29 XC3 010 and applied to microphone amplifier The microphone amplifier consists of operational amplifier and AGC And its output is connected to Codec IC The total gain of amplifiers in Codec IC is set to 0dB The output signal of codec IC is converted to balanced signal by operational amplifier IC28 XC3 010 The converted signals...

Page 9: ... input the 5V signal 2 2 4 7 micro SD circuit The micro SD card interface consists of 4bit data bus and control signals Maximum data transfer speed is 36MHz 2 2 5 Bluetooth Circuit The main component of the Bluetooth circuit is Bluetooth IC IC12 XC3 010 and level converter circuit The clocks of Bluetooth IC requires 19 2MHz for core and 32 768kHz slow clock X1 XC3 010 and X2 XC3 010 for UART Bluet...

Page 10: ...NSISTOR DC switch Q5 TRANSISTOR Buffer amprifier TCXO Q6 DIGI TRANSISTOR DC switch Q7 Q14 FET DC switch Q15 Q16 FET DC switch Q17 TRANSISTOR Mic AGC Q18 FET DC switch D1 2 VARISTOR ESD protection D3 DIODE Reverse current prevention D4 6 LED LED_Key Backlight D7 DIODE Reverse current prevention D8 10 LED LED_Key Backlight D11 DIODE Reverse current prevention D12 15 LED LED_Key Backlight D16 DIODE D...

Page 11: ...output 6 VSSD Ground 7 VSSD Ground 8 VSSD Ground 9 IOVCC O 1 8V output 10 IOVCC O 1 8V output 11 RDX O LCD driver RD signal 12 WRX O LCD driver WR signal 13 DCX O LCD driver data command switch signal 14 CSX O LCD driver chip select signal 15 DB1 I O LCD driver data output 16 DB2 I O LCD driver data output 17 DB3 I O LCD driver data output 18 DB4 I O LCD driver data output 19 DB5 I O LCD driver da...

Page 12: ... I MIC signal input minus_A 22 AFoA O AF signal output minus_A Pin No Name I O Function 23 MICA I MIC signal input plus_A 24 AFoA O AF signal output plus_A 25 ACC_MIC O AUX MIC signal output 26 AFi I AF signal input minus 27 ACC_ME AUX MIC ground 28 AFi I AF signal input plus 29 GND Ground 30 GND Ground 31 GND Ground 32 NC No connection 33 SB O Switched power supply 34 SB O Switched power supply 3...

Page 13: ...e edge of the top cover 1 Note Push evenly on the top cover and be careful that you do not bend it as you install it on the shield cover 3 As you do step 2 above vary the position you hold the top cover as you lift it and remove the top cover 2 Note Once the top cover is removed it cannot be used again SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT There is no adjustment ite...

Page 14: ...e voltage becomes normal the MPU is broken 18D has an abnormal voltage MPU When an abnormal value is confirmed When an abnormal value is confirmed When an abnormal value is confirmed Checking SB Battery voltage Points to be checked Normal voltage 13 6V 15 SB CN2 The BGA parts are not broken If the CN2 is 0V or unstable check the SB output of NX 5700 5800 Main unit When an abnormal value is confirm...

Page 15: ...ule If the voltage becomes normal the LCD Module is broken The LCD displays INIT ERROR 1 An error occurs when the mobile DDR internal RAM reads or writes The mobile DDR may be broken Check the flowchart from beginning 1 RST Reset 2 FRST LOW LOW LOW LOW Reset Reset 3 CS2_2 Active 4 LCDRST 5 CS_4 MPU reset signal Flash memory reset signal Flash memory chip select signal LCD reset signal LCD controll...

Page 16: ... confirmed Verify the 32 768kHz clock for the BT X2 3Pin Square waveform 32 768kHz 1 8Vp p When a normal condition is confirmed Verify the BT control signal BT_SHDN R132 BT ON 1 8V BT OFF 0V When a normal condition is confirmed When an abnormal condition is confirmed Replace the R132 is faulty When an abnormal condition is confirmed The 32 768kHz clock circuit is faulty Replace the X2 L28 C133 R13...

Page 17: ... R85 Q8 R88 R89 R92 R96 Q11 C108 When a normal condition is confirmed Verify the 19 2MHz clock circuit When an abnormal condition is confirmed When a normal condition is confirmed IC13 6pin or CN30 Square waveform UART data Baud rate Default 115 2kbps After 3 967Mbps When a normal condition is confirmed When an abnormal condition is confirmed When an abnormal condition is confirmed When a normal c...

Page 18: ...item d Turn the transceiver power ON and enter the firmware programming mode Note e Check the connection between the transceiver and the personal computer and make sure that the transceiver is in the Pro graming mode f Press Write button in the window When the transceiver starts to receive data the LOADING display on LCD The Firmware is written to DECK NX 5700 NX 5800 and KCH 20R at the same time ...

Page 19: ...1u C100 12u L3 L13 10u C90 L15 4 7u C28 L6 CE 3 VIN 4 VSS 2 VoUT 1 XC8102AA07 G IC10 1k R51 1u C43 0 01u C31 L21 0 1u C103 L14 100k R34 0 01u C84 0 R66 10u C105 100p C110 L4 1u C44 100p C42 1u C38 0 1u C77 1u C98 4 7u C47 0 01u C80 L22 4 7k R31 L20 0 1u C29 D2 S 8 CANH 7 CANL 6 VIo 5 RXD 4 VCC 3 GND 2 TXD 1 TJA1051TK 3 IC1 SPC10501A01 D1 0 1u C32 1 8 120 R20 53DC 36 53DC 35 GND 34 GND 33 CAN 32 CA...

Page 20: ... No RA027 Rev 001 2 2 MEMO ...

Page 21: ...7 AFi 26 ACC_MIC 25 AFoA 24 MICA 23 AFoA 22 MICA 21 AFoB 20 MICB 19 AFoB 18 MICB 17 PRST 16 PSW 15 AUXI0 14 AUXI1 13 AUXO0 12 AUXO1 11 H_1 2 10 AMP_PD 9 GND 8 GND 7 CAN 6 CAN 5 GND 4 GND 3 53DC 2 53DC 1 CN13 L2 S7K 0003 00 S1 100p C68 oUTA 10 PVDD 9 GND 8 oUTB 7 SYNC_oUT 6 SYNC_IN 5 SD 4 VDD 3 IN 2 IN 1 LM48310SD IC2 100p C65 100p C67 0 R52 CAN 16 CAN 15 AFiB 14 AFiB 13 AFiA 12 AFiA 11 NC IGN 10 S...

Page 22: ... 4B R30 A 1A R35 A 5B R36 A 4B R37 A 4A R38 A 1A R40 A 5A R41 A 4B R42 A 3A R43 A 2A R52 A 2B R53 A 3A R56 A 4A R57 A 3A R58 A 2A R69 A 5B R81 A 3A R139 A 3A R140 A 3A R143 A 3A R145 A 3A R151 A 3A R152 A 3A R153 A 3A R156 A 3A R158 A 3A R159 A 3A R161 A 3A R162 A 3A R163 A 3A R164 A 3A R165 A 3A R172 A 3A R179 A 3A R180 A 3A R181 A 3A R183 A 3A R184 A 3A R187 A 2A R189 A 3A R191 A 2A R197 A 3A R1...

Page 23: ... 1B R66 B 2B R67 B 3A R68 B 2B R70 B 3A R71 B 2B R72 B 3A R73 B 3A R74 B 2B R75 B 5B R76 B 4A R77 B 4A R78 B 4A R79 B 2A R80 B 3A R82 B 2B R83 B 3A R84 B 3A R85 B 3A R86 B 2B R88 B 3A R89 B 3A R90 B 1B R91 B 1B R92 B 3A R93 B 2B R94 B 2B R95 B 1B R96 B 3A R97 B 1B R98 B 1B R99 B 3A R100 B 4A R101 B 2B R102 B 1B R103 B 1B R105 B 1B R106 B 3A R107 B 1B R108 B 2B R109 B 2B R110 B 3B R111 B 3A R112 B ...

Page 24: ...2 R21 R20 R8 R7 R3 L11 L7 L6 L5 L4 L2 L1 IC1 E1 D5 D4 D1 C73 C72 C71 C70 C68 C67 C66 C25 C65 C64 C63 C56 C58 C60 C54 C52 C50 C37 C36 C35 C34 C33 C32 C31 C30 C29 C28 C27 C26 C21 C18 C17 C15 C13 C11 C10 C8 D7 D9 D8 D6 C1 F1 IC1 IC2 CN13 INTERFACE UNIT XC3 0110 20 Component side view J7C 0042 00 Foil side view J7C 0042 00 C59 C57 ...

Page 25: ... NC 38 NC 39 NC 40 NC 41 NC 42 NC 43 NC 44 NC 45 GND 46 GND 47 54M 48 GND 49 NC 50 NC IGN CN900 4 SB 3 GND 2 SPG 1 SPo CN4 16 CAN 15 CAN 14 AFoB 13 AFoB 12 AFoA 11 AFoA 10 IGN 9 NC 8 SB 7 GND 6 MICB 5 MICB 4 MICA 3 MICA 2 PSW 1 PRST XC3 011 ACC Connector XC3 010 CN3 GND GND1 BT GPS XC1 040 SB ME 30 BT_AUD_DI 13 6 V SB 21 SB 1 DI CN907 MI2 1 TXD2 AUXO1 GPS ANT AUXIO8 9 1 1 1 BT_AUD_DO TXD2 AUXIO7 2...

Page 26: ... SSM6N37FE D26 1 2V DC DC CONVERTER Q1 EM6M2 SB 3 9V DC DC CONVERTER SW DDR18 39DC DVDD18_1 USB12 IC10 XC8102AA07 G RVDD A1 W02 3785 05 PLL0_VDDA 1 8V DC DC CONVERTER PLL1_VDDA IC5 LXDC2HN18F163 18D_Flash IC2 TPS54240DGQ 18D CVDD DC SW To Sub Unit XC3 010 H_1 2 S1 S7K 0003 00 MICIN IC23 2 2 ANT1 T90 1137 05 BLUETOOTH ANTENNA BT_SDo LIGHT SENSOR SPi1_SDi IC25 ADS7958SRGE 33SD SD_CLK ENC2 SPi1_SDo 2...

Page 27: ...s BEWARE OF BOGUS PARTS Parts that do not meet specifications may cause trouble in regard to safety and performance We recommend that genuine parts be used x_ in a description column shows the number of the used part Contents Exploded view of general assembly and parts list Electrical parts list Packing materials and accessories parts list 3 2 3 4 3 10 ...

Page 28: ...A027 Rev 001 Exploded view of general assembly and parts list Block No M1MM a 3 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 28 27 A A B 10 B B B B B SUB UNIT 01 INTERFACE UNIT 02 a b b 29 ...

Page 29: ...1 13 F1E 0017 10 SHADE TX BUSY LED 14 G1B 0111 00 SHEET KEYTOP LIGHT SENSOR 15 G1D 0042 00 CUSHION LCD LCD HOLDER 16 G1D 0043 00 CUSHION LCD F LASS 17 G53 2206 04 O RING VOL CH x2 18 G5D 0011 00 PACKING SD CARD CAP 19 G5D 0050 00 PACKING ZENSHU 20 J1K 0148 00 HOLDER LCD 21 J2B 0050 00 MOUNTING HARDWARE LCD 22 J3K 0015 00 SPACER VOL TORQUE UP 23 J8C 0004 00 FLEX PRINTED BOARD VOL CH 24 K2K 0139 00 ...

Page 30: ...8 D22 RB521CM 30 DIODE D23 DZ2J180 M ZENER DIODE D24 DZ2J180 M ZENER DIODE D25 B30 2365 05 LED WHITE R 8 D26 B30 2365 05 LED WHITE R 8 D27 B30 2365 05 LED WHITE R 8 D28 B30 2365 05 LED WHITE R 8 D29 RB521CM 30 DIODE D30 RB521CM 30 DIODE D31 RN262CS DIODE D32 SMLP13EC8T LED GREEN D33 B30 2364 05 LED RGB TOP 6P 12 D34 RB521CM 30 DIODE D36 RB521CM 30 DIODE D37 DA221 MULTIPLE DIODE D38 DA221 MULTIPLE ...

Page 31: ...R 0 10UF K C137 CK73HB1E104K C CAPACITOR 0 10UF K Symbol No Part No Part Name Description Local C138 CC73HCH1H220J C CAPACITOR 22PF J C140 CK73HB1C105K C CAPACITOR 1 0UF K C141 CK73HB1C105K C CAPACITOR 1 0UF K C142 CK73HB1C105K C CAPACITOR 1 0UF K C143 CK73HB1C105K C CAPACITOR 1 0UF K C144 CK73HB0J475M C CAPACITOR 4 7UF M C145 CK73HB1C105K C CAPACITOR 1 0UF K C146 CK73HB1E104K C CAPACITOR 0 10UF K...

Page 32: ...al R32 RK73HB1J101J MG RESISTOR 100 J 1 16W R34 RK73HB1J104J MG RESISTOR 100K J 1 16W R35 RK73HB1J681J MG RESISTOR 680 J 1 16W R36 RK73HB1J222J MG RESISTOR 2 2K J 1 16W R37 RK73HB1J331J MG RESISTOR 330 J 1 16W R38 RK73HB1J331J MG RESISTOR 330 J 1 16W R39 RK73HB1J101J MG RESISTOR 100 J 1 16W R40 RK73HB1J681J MG RESISTOR 680 J 1 16W R41 RK73HB1J222J MG RESISTOR 2 2K J 1 16W R42 RK73HB1J331J MG RESIS...

Page 33: ...J 1 16W R201 RK73HB1J103J MG RESISTOR 10K J 1 16W R202 RK73HB1J223J MG RESISTOR 22K J 1 16W Symbol No Part No Part Name Description Local R203 RK73HB1J222J MG RESISTOR 2 2K J 1 16W R204 RK73HH1J473D MG RESISTOR 47K D 1 16W R205 RK73HB1J153J MG RESISTOR 15K J 1 16W R206 RK73HB1J474J MG RESISTOR 470K J 1 16W R207 RK73HB1J474J MG RESISTOR 470K J 1 16W R208 RK73HB1J472J MG RESISTOR 4 7K J 1 16W R209 R...

Page 34: ...0 RK74HB1J470J NET RESISTOR 47 J 1 16W CP11 RK74HB1J470J NET RESISTOR 47 J 1 16W E2 F10 3226 05 SHIELDING CASE E3 F10 3226 05 SHIELDING CASE E4 F1B 0026 00 SHIELDING CASE J1 E68 0426 05 JACK OTHERS J2 E58 0535 05 MODULAR JACK J3 J3K 0014 00 SPACER MODULAR JACK PH1 NJL7502RA PHOTO TRANSISTOR Symbol No Part No Part Name Description Local S1 S70 0901 05 TACT SWITCH S2 S70 0901 05 TACT SWITCH S3 S70 0...

Page 35: ... MG RESISTOR 1 0K J 1 16W R24 RK73HH1J473D MG RESISTOR 47K D 1 16W R25 RK73HH1J103D MG RESISTOR 10K D 1 16W R26 RK73HH1J103D MG RESISTOR 10K D 1 16W R30 RK73HB1J000J MG RESISTOR 0 0 J 1 16W R52 RK73HB1J000J MG RESISTOR 0 0 J 1 16W L1 LB73G0AM 004 CHIP FERRITE BEADS L2 L7K 0009 00 LINE FILTER L4 LB73F0AH 003 CHIP FERRITE L5 LB73F0AH 003 CHIP FERRITE L6 LR79Z0FQ100M CHIP INDUCTOR L7 L41 1592 71 SMAL...

Page 36: ...B1B 0047 00 FILTER 2 PACKING FIXTURE 3 PAMPHLET FCC 4 PROTECTION BAG 60 110 0 07 5 PROTECTION BAG 200X350 6 PROTECTION BAG 100 250 0 07 7 PROTECTION BAG 8 ITEM CARTON 9 J1K 0003 00 BRACKET 10 J2B 0051 00 MOUNTING HARDWARE 11 N08 0550 14 DRESSED SCREW x2 12 N67 3006 43 PAN HEAD SEMS SCREW 13 N9X 0009 00 SCREW SET 2 Block No M2MM 1 3 5 6 4 7 8 9 10 11 12 13 ...

Page 37: ...MEMO ...

Page 38: ... No RA027 Rev 001 VSE Printed in Japan JVC KENWOOD Corporation Communications Systems Business Operation ...

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