Kenwood KRC-666 Service 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).
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.
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
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
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
KRC-666/G/R
6
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Name Module I/O Description Processing Operation
47 PLL CLK TUNER I/O Tuner I2C SCL
48 NC O
49 NC O
50 NC O
51 PANEL 5V to PANEL I/O Panel 5V ON/OFF
Attached the panel, ACC ON :L (Refer to "Truth table 5")
52 NC O
53 NC O
54 VOL A to PANEL I Rotary encorder input Refer to timing chart
55 VOL B to PANEL I Rotary encorder input Refer to timing chart
56 DSI to PANEL O
Eject key illumination, guide illumination, DSI control
Light on :L, Light off :H
57 NC O
58 FILP-DET to PANEL I 14seg retractable detection
59 L CE to PANEL O LCD driver CE
60 NC O
61 TYPE0 EXTRA I Destination setting Refer to "Trush table 4"
62 TYPE1 EXTRA I Destination setting Refer to "Trush table 4"
63 TYPE2 EXTRA I Destination setting Refer to "Trush table 4"
64 NC O
65 ST TYPE0 EXTRA I for OEM Refer to "Trush table 4"
66 ST TYPE1 EXTRA I for OEM Refer to "Trush table 4"
67 NC O
68 NC O
69 NC O
70 MODE1 TAPE I Cassette mechanism mode detection Refer to "Trush table 1"
71 MODE2 TAPE I Cassette mechanism mode detection Refer to "Trush table 1"
72 MODE3 TAPE I Cassette mechanism mode detection Refer to "Trush table 1"
73 MOTOR TAPE O Cassette mechanism main motor Motor active :H, Motor stop :L
74 SUB+ TAPE O Cassette mechanism sub motor Refer to "Trush table 2"
75 SUB- TAPE O Cassette mechanism sub motor Refer to "Trush table 2"
76 R QUAL TUNER I RDS quality
76 NC O When with no RDS, output L fixed
77 R DATA TUNER I RDS data
77 NC O When with no RDS, output L fixed
78 LX-MUTE LX I Mute request from CH H:MUTE ON L:MUTE OFF
79 LX-CON LX O Control output to CH ON:H OFF:L
80 LX-REQM LX O Request output to CH Request detection :L
81 LX-RST LX O Reset for CH
Usually, L after system RST returned, after more than 400msec H, and L
82 MUTE AUDIO O Mute
83 AFS TUNER O
Noise detection time constant switching terminal
FM seek during AF search :L, during receiving :H
84 IC2 SDA AUDIO I/O SDA for EVOL
85 IC2 SCL AUDIO I/O SCL for EVOL
86 P-MUTE AUDIO O Power IC Mute output terminal When power off :L all off :L tel mute :L
87 P-STBY AUDIO O Power IC standby output terminal When power IC on :H off :L
88 SVR AUDIO O Power IC servo control terminal momentary power down :H
89 ACC-DET
Power supply
I ACC detection ACC detection :L with no ACC :H
90 PCON-DET EXTRA I PCON output detection PCON detection :L
91 PANT-DET EXTRA I PANT output detection
PANT detection :L
with no PANT :output L fixed
92 MS MODE TAPE O Tape between music detection switching
While tape play :H
While tape FF/REW, mode except tape :L
KRC-666/G/R
7
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Name Module I/O Description Processing Operation
FWD input :L
93 F/R TAPE O Tape EQ input switching REV input :H
MODE except TAPE :keep the value
94 METAL TAPE O TAPE METAL ON/OFF
NORMAL :H, METAL :L
MODE except TAPE :keep the value
95 DAVSS
Power supply
96 EN2
Power supply
O
Power supply
IC control Refer to "Trush table 3"
97 EN3
Power supplyOPower supply
IC control Refer to "Trush table 3"
98 EN1
Power supply
O
Power supply
IC control Refer to "Trush table 3"
99 SW5V
Power supply
O SW5V control
100 DAVDD
Power supply
Reference power supply for D/A
MODE1 MODE2 MODE3 condition
L H H Eject
H L H Standby
L L L REW
LLHFF
H L L REV play
H H L FWD play
H H H other position
Trush table 1. (Cassette mechanism conditions)
SUB MOTOR + SUB MOTOR - condition
L L Stop (Power off)
L H Normal rotation (way to loading)
H L Reverse (way to eject)
H H Stop (Power on)
Trush table 2. (Cassette mechanism sub motor)
EN1 ILL
L OFF
HON
Trush table 3. (Power supply IC [TDA3682])
EN1 Control
Model number TYPE0 TYPE1 TYPE2 ST TYPE0 ST TYPE1
KRC-766 L LLLL
KRC-694/Y L L H L L
KRC-666R L H L L L
KRC-594/Y L H H L L
KRC-594V/YV H LLLL
KRC-666 H H L L L
Trush table 4. (Destination type list)
Processing intructions for low consumption mode
POWER OFF O L
ACC OFF I Hi-z
Detached the panel I Hi-z
Momentary power down
I Hi-z
(Attached the panel)
Trush table 5. (Panel 5V)
EN2 AUDIO 8V AM 8V FM 8V
L OFF OFF OFF
M ON OFF ON
H ON ON OFF
EN2 Control
EN3 P-ANT P-CON
L OFF OFF
M OFF ON
HONON
EN3 Control
*H=5V M=2.5V L=0V
KRC-666/G/R
8
TEST MODE
1. How to enter the test mode
• While holding the Preset 1 and Preset 3 keys, reset the unit.
2. How to exit from the test mode
• Reset the unit, momentary power down, ACC OFF, power
OFF, and Panel detached.
• (Note) The test mode cannot terminated by Panel is fall
down.
3. Initial status in the test mode
• Sources : All OFF.
• Display : All segments are lit.
• Volume : -10 dB (displayed as 30)
• Loudness : OFF
•CRSC : OFF regardless of the presence of
switching function.
• SYSTEM Q : Flat.
• BEEP : When pressing any keys, the buzzer
generates a beep at any time.
•
DISPLAY TYPE
: TYPE A
4. RDS automatic measurement
• An addition to disposal of substitute for visual check PS
display as usual production lines.
• P-CON terminal is OFF by force, when received the PS
data and in case of corrobaration PS display is "RDS_TEST".
(“_” is mean blank.)
• This disposal is test mode only.
• P-CON is switching the source or return with power on → off.
5. Special display in Tuner mode
When any of the following messages is displayed in Tuner
mode, the front end may be abnormal.
• "TNE 2P NG": The EEPROM is set to the default (unsta-
ble values) because the F/E was shipped without passing
through the adjustment process, etc.
• "TNCON NG": Communication with the F/E is not possible.
6. Forced switching of K3I
•Each press of the Preset 6 key in Tuner mode should
switch K3I from AUTO → Forced Wide → Forced Middle
→ Forced Narrow → AUTO. The initial status is AUTO
and the display shows these modes as follows.
• AUTO : FMA
• Forced Wide : FMW
• Forced Middle : FMM
• Forced Narrow : FMN
7. Test mode specifications of the cassette
receiver
•BLANK SKIPP :OFF
8. Audio-related specifications
• A short press of the Q key initiates the audio adjustment
mode.
•Pressing the ❉ key on the remote initiates the audio
adjustment mode.
•Fader is selected to the initial item.
• Continuous holding of a remote control key is inhibited.
•Bass, Middle and Treble are adjusted in 3 steps of -8/0/+8
with the Track Up/Down keys.
•Balance is adjusted in 3 steps of L15/0/R15 with the Track
Up/Down keys.
•Fader is adjusted in 3 steps of F15/0/R15 with the Track
Up/Down keys.
•Volume Offset is adjusted in 2 steps of -8/0 with theTrack
Up/Down keys.
9. Menu-related specifications
• A short press of the MENU key initiates the Menu mode.
Except, tape source is usually press and hold 1 second to
enter the menu mode and short press initiates turn over.
• Pressing the DNPP/SBF key on the remote initiates the
Menu mode.
• Continuous holding of a remote control key is inhibited.
•Contrast is adjusted in 3 steps of 0/5/10(5x7dot), 0/4/7
(14seg) with the Track Up/Down keys.
10. Backup current measurement
• When the unit is reset while ACC is OFF (i.e. by turning
Back-Up ON), the MUTE terminal goes OFF in 2 seconds
in place of 15 second.
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