Kenwood KRC-666 User manual

©2002-12 PRINTED IN JAPAN
B53-0016-00 (N)484
DC cord
(E30-4790-05): KRC-666R DC cord (E30-4784-05): KRC-666/G
Plastic cabinet assy
(A02-1486-13)
Lever
(D10-4589-04)x2
Remote controller assy (RC-410)
(A70-2025-05): KRC-666/R
Mounting hardware assy
(J22-0011-03)
Antenna adaptor
(T90-0523-05): KRC-666R Screw set (N99-1719-05) Screw set (N99-1730-15)
AUTO
AME
DOLBY B NR
DAB
Panel assy
(A64-2846-02): KRC-666
(A64-2856-02): KRC-666G
Escutcheon
(B07-3022-02): KRC-666
(B07-3054-02): KRC-666G
DOLBY B NR
Panel assy
(A64-2845-02): KRC-666R
Escutcheon
(B07-3022-02): KRC-666R
CASSETTE RECEIVER
KRC-666/G/R
SERVICE MANUAL
The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05.
Please refer to the service manual for model D40-1122-05 (B51-7452-00).
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

DISASSEMBLY FOR REPAIR
KRC-666/G/R
2
How to remove the Volume Knob
1. Remove the rear cover of panel unit.
2. Juck up as remove the switch unit (x16-) and Volume Knob
as shown.
(CAUTION)
Volume Knob cannot pull of front side that looked at tab
point in the rotary encoder.
LIGHTING BOARD
CAP
Be careful of direction.
Rib: tall
CAP
KNOB(VOL)
Dented part
Rib: short
How to install the Volume Knob
1. Remove the peeling paper of LIGHTING BOARD BOSS
side.
2. CAP and LIGHTING BOARD are install positioning as
shown.
5. Install a Volume Knob in rotary encoder positioning as
shown.
KNOB(VOL)
BROAD SIDE
OTHER SIDE
Mount the Volume Knob into
the broad Y shaped cutting in
the direction of the picture.
3. Remove the peeling paper.(Use Tweezers)
4. CAP and Volume Knob are install positioning as shown.
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KRC-666/G/R
3
BLOCK DIAGRAM
TUNER
CASSETTE
CH
BUFFER RDS
DECODER
E-VOL
MPX
&
BUFFER
u-COM
DOLBY EQ
MOTOR
MAIN
AVR
SUB MOTOR
SUB MOTOR
DRIVER
PANEL 5V
EJECT ILLUMI LCD
EJECT SW
PANEL DET
ROTARY
ENCODER
KEY MATRIX
LCD DRIVER
WITH
RESET SW
REMOCON
P CON
ANT CON
POWER
SUPPLY
IC
SW 5V
RESET
WIRED REMO
ACC DET
SURGE DET
B.U DET
TEL MUTE
BACK UP
TEL MUTE
ACC
SP OUT
POWER
IC
DRIVER
PROTECT
THERMAL
MUTE
PRE MUTE PRE OUT
IC2
IC7
IC9
Q51
Q53
IC11
IC8
IC3
IC6
IC4
IC1
PLL-DATA
PLL-CLK
IFC OUT
AUDIO OUT
S-METER
SW5V
A8V
AM+B
SW5V
R CLK
R DATA
S-METER
QUAL
AFS
QUAL
MP IN
LEVEL
TAPE
CH
AM
FM
MODE2
MODE3
SUB-
MOT +B
SUB+
MODE1
FOR(L)
FOR(R)
REV(L)
R REEL
F REEL
REV(R) MTL ON/OFF
DOLBY ON/OFF
MUTE
MS OUT
MS MODE
F/R
SW5V A8V
BACK UP
SUB-
SUB+
MOT +B
LX REQ M
BACK UP
LX RST
LX MUTE
LX DATA S
LX DATA M
LX CON
LX CLK
LX REQ S
BU5V
I2C DATA
I2C CLK
PANEL
EJECT ILL EJECT REMO VOLUME B VOLUME A L DATAL L CE L DATAS L CLK
ILLUMI
BU5V
A8V
FM+B
AM+B
BU5V
ACC DET
B.U DET
PHONE
EN1
EN2
EN3
RST
BEEP
P-MUTE
MUTE
BACK UP
BU5V
SW5V
3600mV
600mV
1800mV
1800mV
K,M-TYPE
FM
CH
AM
TAPE
MODE
1372mV
3600mV
855mV
1800mV
E-TYPE
A8V
DET
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KRC-666/G/R
4
COMPONENTS DESCRIPTION
● SWITCH UNIT (X16-2030-21)
Ref. No
Purpose ¡Function Operation/Condition/Compatibility
IC1 LCD driver Drives LCD
IC2 Remote control IC Controls the unit
Q1,Q4 REMO ON switch The power supply of IC2 is turned on when base level goes "L"
● SYNTHESIZER UNIT (X14-9180-2x)
Ref. No Purpose ¡Function Operation/Condition/Compatibility
IC1 System µ-com Controls FM/AM tuner, the changer, cassette mechanism, Panel, volume and tone.
IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector.
IC3 Power supply IC BU5V(5V) Audio8V(8V) FM+B(8V)
AM+B(8V) P-CON ANT-CON
IC4 Power IC Amplifies the front L/R and the rear L/R to 50W or 47W maximum.
IC6 Muting logic IC Controls logic for muting.
IC7 RDS decoder
IC8 Reset IC "L" when detection voltage goes below 3.5V or less.
IC9 Equalizer amplifier Dolby-B, Metal-EQ, Equalizer the Tape sound(120µ sec).
IC11 Sub motor driver Sub motor control
Q1 Serge detection
"L" when the back-up voltage becomes more than 18V(momentary power down).
"H" when the back-up voltage becomes less than 18V.
Q2 BACK-UP detection "L" when B.U is present.
"H" when B.U is absent or momentary power down is detected.
Q3 ACC detection "L" when Acc is present.
Q4 SW 5V ON when the base is "L".
Q5 Power-antenna detection "H" when P-ANT output is short-circuit(P.ANT OFF).
"L" when FM/AM signal does not exist.
Q6 P-CON detection "H" when P-CON output is short-circuit.
Q51 Main motor switch 1 Outputs 14V when the base is "L".
Q52 Main motor switch 2 Q51 turns ON when the base is "H" .
Q53 Sub motor AVR Output 3.6V when the base of Q4 is "L".
Q54 MSTC switch ON when the base is "H" .
Q101 Composite signal buffer
Q151 DSI driver DSI lights when the base is "L".
DSI turns off when the base is "H" .
DSI turns on and off when panel is taken off.
Q152 Panel 5V switch When the panel is attached, the base goes "L", turning the Tr ON to supply 5V
to the panel. When panel is taken off, panel 5V cut off.
Q201 Noise buffer
Q350 Pre mute switch Drives the pre mute switch (Q351~354) when the base is "L".
Q351 Pre mute switch Mutes the rear Lch when the base is "H".
Q352 Pre mute switch Mutes the rear Rch when the base is "H".
EN1 ILLUMI
0V OFF
5V ON
IN OUT EN2 AM FM A8V
0V OFF OFF OFF
2.5V OFF ON ON
5V ON OFF ON
IN OUT EN3
ANT-CONP-CON
0V OFF OFF
2.5V OFF ON
5V ON ON
IN OUT
IN SUB MOTOR
IN1(–) IN2(+)
L L STOP
LH CW
H L CCW
H H STANBY
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KRC-666/G/R
5
MICROCOMPUTER'S TERMINAL DESCRIPTION
● SYSTEM MICROCOMPUTER MN101C49HNA (IC1: X14-)
Pin No. Name Module I/O Description Processing Operation
1 VREF-
Power supply GND for A/D
2 F REEL TAPE I Reel pulse FWD Cassette mecha reel pulse output FWD Vth=2.5V
3 R REEL TAPE I Reel pulse REW Cassette mecha reel pulse output REW Vth=2.5V
4 S-METER TUNER I K3I tuner S-meter
5 IFC-OUT TUNER I IF count 0V or 5V
6 NOISE TUNER I FM noise detection terminal
7 PHONE EXTRA I PHONE detection terminal
Tel mete :1V or less, NAVI MUTE:2.5V or less,
Only J type 1V or less,more than 2.5V NAVI
7 PHONE EXTRA I When Not used, output L fixed
8 DCDET RESERVE Power supply
I Not used DE DET pull down DC offset detection terminal of P-IC
9 GND
Power supply GND
10 VREF+ Power supply VCC for A/D
11 VDD
Power supply Microcomputer's main Vcc
12 MAIN OSC1 Main oscillation input 8.38MHz
13 MAIN OSC2 Main oscillation input
14 VSS Power supply Microcomputer's main GND
15 SUB OSC1 32.768kHz oscillation input
16 SUB OSC2 32.768kHz oscillation input
17 GND
Power supply GND External ROM
18 LX-DATAM LX O Data output to CH Last maintain
19 LX-DATAS LX I Data input from CH
20 LX-CLK LX O Clock input and output with CH
21 FLASH READ O
22 FLASH WRITE O
23 FLASH CLK O
24 BEEP AUDIO O Beep for built in amplifier
25 PANEL-DET to PANEL I Panel existence detection terminal Detached the panel :L, Attached the panel :H
26 REMO to PANEL I Remote control input
27 R-CLK TUNER I Clock for RDS decoder With no destination
: out put L fixing
27 NC O With no RDS output L fixed
28 LX-REQS LX I Request input from CH Request detection : L
29 B.U-DET Power supply I Momentary power down detection BU detection :L With no BU :H
30 EJECT to PANEL I Tape eject L
: KEY input
31 KEY-REQ to PANEL I Communication request from LCD driver L : KEY input
32 VDD Power supply I VDD
33 RESET I Reset During tape play
: L
34 EQ MUTE TAPE O Equalizer mute During tape FF/REW
: H
Mode except tape : H
35 DOLBY TAPE O B NR ON/OFF B NR ON
: H, B NR OFF : L
Mode except tape :keep the value
36 MUSIC TAPE I Tape between music detection music signal detection:L, with no music signal:H
37 NC O
38 NC O
39 NC O
40 NC O
41 VDD
Power supply I VDD
42 L DATAS to PANEL O TXD for LCD
43 L DATAL to PANEL I RXD for LCD
44 L CLK to PANEL O Clock for LCD
45 PLL DATA TUNER I/O Tuner I2C SDA
46 NC O
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299