Kenwood C-929 Service manual

CD CHANGER

C929

SERVICE MANUAL

The following reference numbers with accessory parts are the same reference numbers used on EXPLODED VIEW and PARTS LIST.

Refer to the service manual "KDC-C710" (B51-7104-00) for MECHANISM OPERATION DESCRIPTION.

223

215

227x10

217

216

230

229

221

225

222

224

226x2

SW5V

LIM SW

L.P.S.

EJ SW

ARM SW

12.5MHz

SPINDLE/LO-EJ

SLED

LOE SW

TR COIL

FO COIL

BTL

EEPROM

&TEXT DECODER

APC

SA5V

S8V

SYSTEM u-COM

IC7

IC1

RF AMP&SERVO DSP

P-ON

Q10

Q15,16

Q20

BU. DET

IC8

IC5

MG SW

8V AVR

S8V

S-RAM

BU14V

CH RST

AUDIO OUT

HOT

IC9

RST

7V/9V

Q21,22

M5V

D5V

SW5V

&DC MOTOR

DRIVER

ELEVATOR

AVR

SA5V

&D/A CONVERTER &SCF

SD5V

D5V

AVR

BUS I/F

IC11

to HEAD UNIT

D.R.I.V.E. DAC DIGITAL FILTER

IC10

16.93MHz

5VREG

IC4

AUDIO VREF

IC2

DA5V

IC3

L.P.F

S8V

0bit MUTE

Q4,5

MUTE

Q6-8

RELAY

K1,2

Q23,24

AUDIO

NO SW

BUS DRIVER

IC14

6.29MHz

CH-MUTE

Q14

CH MUTE

SYS-ON

Q13

SYS ON

DOUT

to OPTICAL OUT

D-OUT

Q25

DG-CON DG-CON

D5V

ASSY (X13- )

(X32- )

C929

(X16- )

(X92- )

PICKUP

XOFF

C929

BLOCK DIAGRAM

COMPONENT DESCRIPTION

CD PLAYER UNIT (X32-4970-00)

REF.

No.

IC1

IC2 VOLTAGE FOLLOWER Audio reference voltage supply. IC3 ACTIVE FILTER 2nd low pass filter. IC4 AVR Audio 5V power supply. IC5 MOTOR DRIVER Focus tracking actuator, Sled/Spindle MD deck up/down motor driver. IC7 SYSTEM µ-COM Servo control / Mechanism control / Multiple purposes interface. IC8 MEMORY Mechanism up/down position offset servo initial data memory.

IC9 µ-COM RESET. Resets u-com. IC10 DRIVER DAC. IC11 TEXT DATA MEMORY Memorises data from text decoder through u-com. IC14 IE-BUS DRIVER Bus driver.

Q1 LASER CONTROLLER "ON" when IC13's APC goes on. Q4 Q1 DRIVER 0 bit mute goes on when "H" level signal is putout from LZ port of IC6. Q5 Q2 DRIVER 0 bit mute goes on when "H" level signal is putout from RZ port of IC6.

Q6,7 AUDIO MUTE Mute goes on when "L" level signal output from A. MUTE port of IC7.

Q8 Q1&2 DRIVER Mute goes on when "L" level signal is output from A. MUTE Port of IC7.

Q9 CD SYSTEM 5V POWER SUPPLY Transistor with regulator inside the IC12. Q10 P.ON SW SW5V turns on when "L" level signal is output from P.ON port of IC7. Q11 RESET SW Resets u-com by "H" level reset control signal from the head unit. Q12 CLOCK ON/OFF Clock goes off when "H" level signal is output from XOFF port of IC7. Q13 SYSTEM-ON SW Works during the ACC and power on.

Q14 CH-MUTE SW

Q15 SW +8 AVR Q16 Q15 DRIVER Drives Q15. Q17 AVR 8V SW Switches AVR 8V power supply. Q18 Q11 DRIVER Drives Q11. Q19 AVR 7V/8V SW "H" (7V) : Usual play mode. "L" (8V) : Elevator up/down. Q20 B.U. VOLTAGE DOWN DETECTION

Q21 B.U. +5V AVR Q22 Q21 DRIVER Drives Q21. Q23 Q24 DRIVER Audio turns on when "H" level signal is output from AUDIO port of IC7. Q24 RELAY SW

Q25 Q1 (on X16-) DRIVER

Q31 MOTOR DRIVER REFERENCE

Q32 SUB BEAM F SIGNAL TIME

RF ERROR AMPLIFIER / SERVO amplifier, Defect RFOK mirror circuit, EFM comparator, Vibration DIGITAL SIGNAL PROCESSOR detector, Digital servo data processor, Digital loop filter, 8 times over

VOLTAGE SW

CONSTANT SW

FUNCTION OPERATION

RE amplifier, Focus/Tracking error amplifier, APC circuit, Reference

sampling filter, D/A converter.

Audio mute output level goes on when "H" level signal is output from AUDIO port of IC7.

Digital-out turns on when "H" level signal is output from DGCON port of IC7.

"H" when time constant takes effect.

C929

SUB-CIRCUIT UNIT (X16-1030-00)

REF.

No.

Q1 D-OUT (TRANSISTOR VCC SW)

Q2 D-OUT (TRANSMITTER DRIVER)

FUNCTION OPERATION

C929

(X32-) IC7 : µ-COM

PORT

No.

10 X2 - Main clock 2. 11 X1 I Main clock 1. 12 VSS - GND. 13 - - 14 XT1 - Sub clock 1. 15 RESET I Reset. 16 FO-GUP I Focus gain-up SW. "H" : Focus gain up. 17 MG-SW I Magazine SW. "H": Magazine inserted. 18 EJ-SW I Eject SW. "H" : Switch on. 19 B-REQ-H I Communication request signal. 20 PACK I Text data - Pack synchronization signal. 21 SYS-ON I Changer control from head unit. "L" : System on. 22 BU-DET I Back-up momentary power-down detection. "H" : Momentary power down. 23 AVDD - VDD. 24 A VREF 0 I Inner A/D converter reference voltage.

25 HOT I Temperature-up detection.

26 LPS I Mechanism deck height detection. 27 LO-E-SW I Loading end SW. "L" : Loading ends.

28 LIM-SW I Limit switch.

29 T-OFF I Tracking-off mode. "H" : Tracking off. 30 ADJ-SEL I Servo automatic adjustment on/off. "H" : Automatic adjustment off. 31 TEST1 I For mechanism endurance test. 32 TEST2 I For mechanism endurance test. 33 AVSS - GND. 34 AUDIO O Audio relay control out. "H" : Changer source. 35 A-MUTE O Audio mute. "L" : Mute on. 36 A VREF 1 - Inner A/D converter reference voltage. 37 S-DI I Servo IC communication serial data. 38 S-DO O Servo IC communication serial data. 39 S-CK O Servo IC communication serial clock. 40 B-DIC I Bus serial. 41 B-DCOM O Bus serial. 42 B-CLK O Bus serial clock. 43 B-C/D O Bus command data SW. 44 CH-MUTE O Audio mute to head unit. "L" : Mute on. 45 TSI I Text data. 46 TSO O Text data. 47 TSCK O Text clock. 48 A0 O Address setting to S-RAM. 49 A1 O Address setting to S-RAM. 50 A2 O Address setting to S-RAM. 51 A3 O Address setting to S-RAM. 52 A4 O Address setting to S-RAM.

PORT NAME I/O FUNCTION OPERATING CONDITION

1--2 TSTB O Text data strove.

3 T-BANK I Tracking filter bank SW signal. "H" : Bank 1 (Gain-up mode). 4 F-OK I Focus-on signal. "H" : Focus on. 5 XTALEN O DAC servo IC oscillation stop control. "H" : Oscillation stop. 6 RESET O Servo IC reset. "L" : Reset. 7 SAO O Servo IC communication address setting. 8 SSTB O Servo IC communication strove. 9 VDD - VDD

MICROCOMPUTER'S TERMINAL DESCRIPTION

Detects over 4V, releases the detection when the voltage goes to be under 4V.

"L" : Laser pick-up being most inside

detection.

MICROCOMPUTER'S TERMINAL DESCRIPTION

(X32-) IC7 : µ-COM

PORT

No.

53 A5 O Address setting to S-RAM. 54 A6 O Address setting to S-RAM. 55 A7 O Address setting to S-RAM. 56 D0 I/O Data from and to S-RAM. 57 D1 I/O Data from and to S-RAM. 58 D2 I/O Data from and to S-RAM. 59 D3 I/O Data from and to S-RAM. 60 D4 I/O Data from and to S-RAM. 61 D5 I/O Data from and to S-RAM. 62 D6 I/O Data from and to S-RAM. 63 D7 I/O Data from and to S-RAM. 64 A8 O Address setting to S-RAM. 65 A9 O Address setting to S-RAM. 66 A10 O Address setting to S-RAM. 67 A11 O Address setting to S-RAM. 68 A12 O Address setting to S-RAM. 69 A13 O Address setting to S-RAM. 70 A14 O Address setting to S-RAM. 71 A15 O Address setting to S-RAM. 72 VSS - GND. 73 A16 O Enable control to S-RAM. 74 A17 O Enable control to S-RAM. 75 DG-CON O Digital-out control. "H" : Digital out. 76 ELV-ADJ I Mechanism deck height adjustment mode. "L" : Adjustment mode. 77 RD O Reading control to S-RAM. 78 WR O Reading control to S-RAM. 79 WAIT I WAIT insertion from S-RAM during accessing. 80 - - 81 VDD - VDD.

82 PU-SEL I Laser pick-up type discrimination.

83 PU-OK I Laser pick-up type discrimination. "H" : The laser pick-up is OK. 84 SP/LO + O Spindle/Loading control. 85 SP/LO - O Spindle/Loading control. 86 ELV+ O Mechanism up/down control. 87 ELV- O Mechanism up/down control. 88 SRV-SEL I Servo operating mode. "H" : Servo mode. 89 SEARCH O Search play SW. "L" : Searching. 90 SLNSA O Sled non-felt area on/off. "L" : Sled non-felt area on. 91 EEP-WR O EEP-ROM writing mode. "H" : EEP-ROM writing mode. 92 7V/8V O Mechanism driving IC power supply control. 93 NO-SW I Bus number SW. "H" : CH1. "L" : CH2. 94 TEST/VPP - Flash ROM program mode. 95 B-CS O Bus chip selector. 96 B-RST O Bus reset. 97 SDA I/O EEP-ROM data. 98 SCL O EEP-ROM clock. 99 P-ON O P-ON. "L" : AVR power on.

100 ARM-SW I Arm SW. "H" : Arm SW on.

PORT NAME I/O FUNCTION OPERATING CONDITION

"H" : Made by KENWOOD. "L" : Made by others.

C929

PARTS DESCRIPTIONS

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