Kenwood KRC-609, KRC-679R, KRC-781R Service Manual

AUD
SCANB NR B.S/RDM REP MTL/M.RDM
PROG
LOUD
AUTO
DISP NAME.S
PWR OFF
CR2
47W x 4
AUD
SCANB NR B.S/RDM REP MTL/M.RDM
PROG/PTY
LOUD
T I DISP
NAME.S
VOL ADJ
PWR OFF
47W x 4
CR2 K3I
AUD
SCANB NR B.S/RDM REP MTL/M.RDM
PROG/PTY
LOUD
T I DISP
NAME.S
VOL ADJ
PWR OFF
47W x 4
CR2 K3I
AUD
SCANB NR B.S/RDM REP MTL/M.RDM
PROG
LOUD
DISP NAME.S
PWR OFF
47W x 4
CR2
AUTO AME
CASSETTE RECEIVER
KRC-609
SERVICE MANUAL
© 2001-4 PRINTED IN KOREA B51-7793-00 (K) 3402
KRC-679R/RY KRC-781R/789
The following reference numbers with accessory parts are the same reference numbers used on EXPLODED VIEW and PARTS LIST.
KRC-609 (K)
KRC-679R/RY (E)
KRC-781R (M) KRC-789 (M)
KRC-609
KRC-679R
KRC-781R KRC-789
201
277
780
RC1
276
261
222
x2
259
278
216
DC1
DC2
2
AUDIO
S-METER
IFC OUT
PLL DATA
PLL CLK
SW5V
FM
AM
TAPE CHANGER
S METER
SDA
SCK
S MUTE
A 8V
MODE 2
SUB-
MOT+B
SUB+
MODE 1
REV (L)
FOR (R)
REV (R)
FOR (L)
R REEL
F REEL
MODE 3
SRT SW2
SRT SW1
S METER
IFC PLL DATA
PLL CLK
MS OUT
MTL ON/OFF
MODE 2 MODE 3
R REEL
MODE 1
F REEL
MS MODE
F/R
MUTE
DOLBY ON/OFF
DATA C
CH RST CH MUTE
DATA H CH CON
CH CLK REQ H REQ C
RESET
SUB -
SUB +
MOTOR
ILL ON
AM+B
FM+B
SCK
SDA
PRE MUTE
MUTE
BEEP
P MUTE
ACC DET
PHONE
DIMMER
EXT AMP CONT
P CON
P-5V
ANT CONT
B.U DET
SW5V
SW5V
2
3
2
6
CH MUTE
CH RST
DATA H
DATA C
CH CON
REQ C
CH CLK
REQ H
BACK UP
8
1200mV
388mV
A 8V
SW5V
B.U.5V
2
2 SUB-
SUB+
MOT+B
A8V
B.U.5VSW5V
MUTE
AUX IN
BACK UP
SW5V
B.U.5V
B.U.5V
CH
FM
1800mVTAPE
AM
3600mV
855mV
1372mV
600mV
3600mV
1800mV
E TYPE K TYPE
1800mV
RCLK
QUAL
RD ATA
QUAL
AFS
NOISE
AFS
MTL ON/OFF
F/R
MS OUT
DOLBY ON/OFF
MUTE
MS MODE
5
6
P ON
L CE
L CLK
DIMMER
L DATA S
L DATA L
REMO
LCD
SC CON
V-ILL
MC DATA
MC CLK
MC REQ
SC DATA
P-RESET
DIMMER
TEL MUTE
ACC
ANT CON
P CON
BACK UP
EXT.AMP CONT
F/E
FM+B
BUFFER
DECODER
RDS
E-VOL
MPX
N.C.
AM+B
CASSETTE MECH
SYSTEM U-COM
CD-CHANGER MD-CHANGER
KEY
MATRIX
RESET
SW
LCD
DRIVER
REMO
G/R SW
RESET
U-COMMATRIX
SW
RESET
LCD
KEY
REMO
PANEL
G/R SW
DRIVER
SUB MOT
MAIN MOT
AVR
VOLTAGE LIMITTER
ILL AVR
A 8V SW14V
EXT AMP CONT
DIMMER
ACC DET
TEL MUTE
P CON
B.U DET
ANT CON
SW5V B.U.5V
P-5V
SRT
MECHA
POWER IC
THEMO
PROTECT
MUTE LOGIC
DRIVER
MUTE
SP OUT
1.8V PRE OUT
LCD
BUFFER
BUFFER
DOLBY EQ
TYPE
LCD
TYPE
V-ILL
LCD DRIVER
251mV(ETYPE)
470mV(KTYPE)
FM :
AM :
230mV
KRC-509S/689 (K/M) KRC-579R/RY (E) KRC-609,679R/RY,781R/789 (K/E/M) KRC-V679R/RY (E)
KRC-609,679R/RY,781R/789

BLOCK DIAGRAM

KRC-609,679R/RY,781R/789

COMPONENT DESCRIPTION

SYNTHESIZER UNIT (X14-xxxx-xx)

REF
No.
Q1-4 PREOUT MUTE SW Preouts are muted when the base level goes "H".
Q17,20 AUDIO 8V AVR Q20 is turned on when Q17's base level goes "H".
Q18 PANEL 5V SW Q45 is turned on when Q18's base level goes "H".
Q21,22 B.U. 5V AVR Q22 is turned on when Q21's base level goes "H".
Q23 SW 5V ON when the base level goes "L". Q24 BACK-UP DETECTION ON when the base level goes "H" during the back-up works.
Q25 ACC DETECTION ON when the base level goes "H" during the ACC works. Q26,27 P-ANT SW Q26 is turned on when Q27's base level goes "H". Q28-31 P-CON SW Q28 is turned on when Q31's base level goes "H".
Q32 DIMMER SW ON when the base level goes "H" while vehicle small lamps turn on. Q33,34 ILLUMINATION AVR ON when Q44's base level goes "H". Q35,36 SW 14V Q36 is turned on when Q35's base level goes "H". Q37,38 MOTOR DRIVER POWER SUPPLY Q38 is turned on when Q37's base level goes "H".
Q39 EXTERNAL AMPLIFIER CONTROL ON when the base level goes "L".
Q40 ILLUMINATION AVR ON when Q44's base level goes "H". Q41,42 MOTOR SW Q42 is turned on when Q41's base level goes "H".
Q44 ILLUMINATION AVR ON when Q44's base level goes "H".
Q45 PANEL 5V SW Q45 is turned on when Q18's base level goes "H".
Q71 PREOUT MUTE DRIVER ON when the base level goes "L".
Q72 E-VOL MUTE SW ON when the base level goes "H".
Q73 NOISE BUFFER Q86,88 AM+B SW Q88 is turned on when Q86's base level goes "H". Q87,89 FM+B SW Q89 is turned on when Q87's base level goes "H".
Q90 COMPOSITE OUTPUT BUFFER
Q92 IFC BUFFER
Q95 MSTC SW Q95 is turned on when MS mode level goes "H".
IC1 SYSTEM u-COM IC2 E-VOL / NOISE CHANCELLOR / MPX
IC4 POWER IC IC10 MUTE LOGIC IC11 RDS DECODER IC13 MOTOR DRIVER IC15 RESET IC16 DOLBY
FUNCTION OPERATION

SWITCH UNIT (X13-xxxx-xx)

REF.
No.
Q1,2 KEY DETECTION SW
Q3,4 KEY ILLUMINATION SW
Q5 LCD REFERENCE VOLTAGE SUPPLY Stabilises voltage circuit. Q6 REMOTE IC POWER SUPPLY Remote controller works when the base level goes "L".
Q7 DIMMER SW
IC1 LCD DRIVER
IC2 REMOTE SENSOR
FUNCTION OPERATION
Q1 is to start the key scan for the SRT. Q2 is to start the key scan for the M&T. Lights red key-illumination when Q3's base level goes "H". Lights green key-illumination when Q4's base level goes "H".
Usually the base level is "H". During the dimmer on, the base level goes "H" and "L" repeatedly in a moment.
3
KRC-609,679R/RY,781R/789

MICROCOMPUTER'S TERMINAL DESCRIPTION

(X14-) IC1 : SYSTEM µ-COM

PORT
No.
1 AM+B O AM power supply. "H" : During receiving AM. 2 FM+B O FM power supply. "H" : During receiving FM.
3 AFS O Noise detection time constant SW.
4 PLL-DATA I/O Data from and to the front-end. 5 PLL-CLK I/O Clock from and to the front-end. 6 EVDD - VDD. 7 GND - GND. 8---
9 BEEP O Beep. 10 REMOTE I Remote sensor. 11 P-ON O SW 14V control. "H" : Power on. "L" : Power off. 12 P-STBY O Power IC stand-by control. "H" : Power IC on. "L" : Power IC off. 13 IC2-SDA I/O IC2 data line. 14 IC2-SCL I/O IC2 clock line. 15 PRE-MUTE O Premute. "L" : Reset / Momentary power down. 16 17 18 TEST - Test. 19 P-CON O Power control. "H" : Power on. "L" : Power off. 20 ANT-CON O Antenna control. "H" : Tuner on, TI on.
21 MUTE O Mute.
22 - - - -
23 ACC-DET I ACC detection.
24 25 26 CH-MUTE I Mute request from the changer. "H" : Mute on. "L" : Mute off. 27 CH-CON O Changer control. "H" : Changer on. "L" : Changer off. 28 29 CH-RST O Resets the changer. "L" : Normally.
30 EXT-AMP O External amplifier control. 70mS "L" level : Bass boost LOW.
31 32 XT1 I Sub clock. 33 XT2 - Sub clock. 34 REG-C - To inner u-com's regulator
35 X2 - Main clock. Power off or Momentary power down :
36 X1 I Main clock. 37 VSS - GND. 38 VDD - VDD.
39,40 - - -
41 MOTOR O Main motor. "H" : Motor driving. "L" : Motor stopping. 42 MODE2 I Mode detection for the cassette mechanism. 43 MODE1 I Mode detection for the cassette mechanism.
44,45 - - -
46 SUB- O Sub motor. 47 SUB+ O Sub motor.
48-50 - - -
PORT NAME I/O FUNCTION OPERATING CONDITION
P-MUTE
DIM-CON/SC-CON
DIMMER
SW 5V
CH-REQ-H
RESET
O Power IC mute. "L" : Power off / All off / Tel mute. O Dimmer control or panel u-com control. "H" : Dimmer off. L : Panel off.
I Detects the small signal. "H" : Small off. "L" : Small on.
O 5V power supply. "H" : 5V off. "L" : 5V on.
O Request to the changer. "L" : During requesting.
I Reset. "H" : Normally. "L" : Reset.
"H" : During receiving. "L" : During seeking FM or searching AF.
"ON" : Open. "OFF" : Level "L". Time constant : 0.48mS.
"H" : ACC does not exist. "L" : ACC exists.
40mS "L" level : Bass boost OFF.
100mS "L" level : Bass boost HI.
Power on : During oscillating.
No oscillation.
4
KRC-609,679R/RY,781R/789
MICROCOMPUTER'S TERMINAL DESCRIPTION
(X14-) IC1 : SYSTEM µ-COM
PORT
No.
51 - - ­52 ILLUMI-ON O Illumination. "H" : Illumination on. "L" : Illumination off.
53,54 - - -
55 BVDD - Power supply. 56 BVSS - GND. 57 - - ­58 TYPE-2 I/O Destination SW. 59 TYPE-1 I/O Destination SW. 60 TYPE-0 I/O Destination SW. 61 IC2-TYPE-1 I Destination. "L" : Initial setting. 62 IC2-TYPE-0 I Destination. "L" : Initial setting. 63 - - -
64
65 MC-REQ/L-CE I/O Request to panel u-com. "L" : Panel on.
66,67 - - -
68
69 MSC O No-sound detection time constant SW.
70 AV CONT O Reference voltage control. 71 AVDD - VDD. 72 AVSS - GND. 73 AVREF I Reference voltage supply.
74 PHONE I Phone detection.
75 R-REEL I Reverse reel pulse of cassette mechanism. 76 F-REEL I Forward reel pulse of cassette mechanism. 77 SRT-SW2 I SRT mechanism position detection. 78 SRT-SW1 I SRT mechanism position detection. 79 NOISE I FM noise detection. 80 S-METER I S-meter detection. 81 R-DATA I RDS decoder data. 82 R-QUAL I RDS decoder qual. 83 IFC-OUT I Front-end IFC. "L" : Signal exists. 84 MUSIC I No-sound detection. "H" : No sound. "L" : Sound exists. 85 - - ­86 DOLBY O Dolby SW. "H" : Dolby on. "L" : Dolby off. 87 R-CLK I RDS decoder clock. 88 89 SC-REQ/KEY-REQ I Request from panel u-com. 90 MODE3 I Cassette mechanism SW.
91 EQ-MUTE O Equalizer mute SW.
92
93
94 CH-DATA-C I Data from the changer. 95 CH-DATA-H O Data to the changer. 96 CH-CLK I/O Clock from and to the changer. 97 SC-DATA/L-DATA-L I Data from panel u-com. 98 MC-DATA/L-DATA-S I/O Data from and to panel u-com. 99 MC-CLK/L-CLK I/O Clock from and to panel u-com. "L" : Panel off.
100 PAN-5V O Panel 5V control. "H" : Panel on. "L" : Panel off.
PORT NAME I/O FUNCTION OPERATING CONDITION
"H" : Normally.
P-RST
FWD/REV
CH-REQ-C
NML/MTL
BU-DET
O Resets panel u-com. "L" : Rest / Panel off / Momentary power
down / U-com running out of control.
O Tape equalizer. "H" : Reverse. "L" : Forward.
"H" : Tape playing. "L" : During FF/REW, Except tape mode.
Tel mute : Under 1V. Navi mute : Over 2.5V.
I Request from the changer. "L" : request exists.
"H" : During FF/REW, Except tape mode. "L" : Tape playing.
O Normal/Metal SW. "H" : Normal. "L" : Metal.
I Momentary power-down detection.
"H" : No back-up (Momentary power down). "L" : Back-up exists.
5
KRC-609,679R/RY,781R/789

TEST MODE

1. How to enter the test mode While holding the FM and Preset 6 keys, reset the unit.
2. How to exit from the test mode While holding the Preset 6 key, reset the unit. (Note) The test mode cannot be terminated by ACC OFF,
power OFF or momentary power 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
• LED : White for no scanning. (VLCD model)
4. Special display in Tuner mode When any of the following messages is displayed in Tuner mode, the F/E may be abnormal.
• "TNE2P NG" : The EEPROM is set to the default
(unstable values) because the F/E was shipped without passing through the adjustment process, etc.
• "TNCON NG" : Communication with the F/E is not
possible.
5. Forced switching of K3I Each press of the Preset 6 key in Tuner mode should switch K3I from AUTO î Forced Wide î Forced Middle î Forced Narrow î 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
6. Test mode specifications of the CD receiver
• Forced ejection is inhibited in the reset start operation.
When the unit is reset while a CD is loaded in it, the CD is not recognized by resetting.
• Each press of the Track Up key jumps to the following
track numbers: No. 9 î No. 15 î No. 10 î No. 11 î No. 12 î No. 13 î No. 14 î No. 9 (The cycle restarts from here.)
• Each press of the Track Down key jumps to the previ­ous track number to the track being played.
7. Audio-related specifications
• A short press of the Q key initiates the audio adjustment mode.
• Pressing the îkey on the remote initiates the audio adjustment mode.
• Continuous holding of a remote control key is inhibited.
• Bass, Middle and Treble are adjusted in 3 steps of Min/Center/Max with the Track Up/Down keys.
• Balance is adjusted in 3 steps of Left Max/Center/Right Max with the Track Up/Down keys.
• Fader is adjusted in 3 steps of Rear Max/Center/Front Max with the Track Up/Down keys.
• HPF is adjusted in 2 steps of Through/220 Hz with the Track Up/Down keys.
• LPF is adjusted in 2 steps of Through/120 Hz with the Track Up/Down keys.
• Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble f are not dealt with by the audio adjustment.
8. Menu-related specifications
• A short press of the CLK key initiates the Menu mode.
• Pressing the DNPP/SBF key on the remote initiates the Menu mode.
• Continuous holding of a remote control key is inhibited.
• Calendar adjustment, calendar display switching and calendar memo are eliminated from the targets of con­tinuous key holding. (FL model)
• In the color adjustment mode, pressing the Preset 1 key sets Red, 2 sets Blue, 3 sets Green and 4 sets Green. (VLCD model)
• Contrast is adjusted in 3 steps of 0/5/10 and the default is 5. (VLCD/LCD model)
• Brightness is adjusted in 3 steps of 0/5/10 and the default is 10. (Normal FL model)
9. Backup current measurement When the unit is reset while ACC is OFF (i.e. by turning Backup ON), the MUTE terminal goes OFF in 2 seconds in place of 15 second. (The panel, CD mechanism and TAPE mechanism are not activated at this time.)
10. Special display when the display is all on Pressing the Preset keys while the power is ALL OFF dis­plays the following information.
Version display (8 digits, Month/Day/Hour/Minute)
[PRESET 1] (Display) SYS xxxxxxxx System microcomputer
PAN xxxxxxxx Panel microcomputer
[PRESET 2]
Serial No. display (8 digits)
(Note) CD/RK type eXcelon model
(Display) S. No. xxxxxxxx Short press : View power ON time.
(The All OFF period is not counted.)
[PRESET 3] Long press/hold : Clear power ON time.
(Display) PonTim xxxxx Max. 65535 (hours) Short press
: Display TAPE/CD/MD operation time.
[PRESET 4] Long press/hold
: Clear TAPE/CD/MD operation time
(Display) CDTime xxxxx (CD/R)
TapTim xxxxx (C/R) Max. 65535 (hours)
Short press
: Display TAPE/CD/MD ejection count.
[PRESET 5] Long press/hold
: Clear TAPE/CD/MD ejection count.
(Display) EjeTim xxxxx Max. 65535 (times) Short press : Display Panel open/close count.
[PRESET 6] Long press/hold : Clear Panel open/close count.
(Display) PnCnt xxxxx Max. 655350 (times)
TEST MODE
6
KRC-609,679R/RY,781R/789
11. Other specifications
Automatic panel closing when a tape/CD is inserted is inhibited. (M&T model)
Panel operation by turning power OFF/ON is inhibited. (M&T model)
Messages such as "CODE OFF" are not displayed when power is turned ON.
Pressing the ATT key opens or closes the panel. (M&T model)
Pressing the TI (AUTO) key during changer operation turns 2zone ON. 2zone can be turned OFF by pressing the TI (AUTO) key again. The P/S dot lights while 2zone is ON.
Pressing and holding the CLK key for a second in the ALL OFF status the Mask Key (security) write mode.
• Security-related information
1. Forced Power ON mode (All models) Even when the security (Mask key) is approved, resetting the unit while holding the ATT and Preset 4 keys makes it possible to turn the power ON for 30 minutes. After 30 minutes have elapsed, it is not possible to return to the previous condition unless the unit is reset again.
2. Method of registration of the security code after EEPROM
(Tuner Unit Ass'y) replacement (Code security model)
(1) Enter the test mode. (See " 1. How to enter the test
mode")
(2) Press the CLK key to enter the security registration
mode.
(3) Enter the code using the Preset 1/2/3/4 keys.
Example: To enter "3510"
Press the Preset 1 key 4 times.
Press the Preset 2 key 6 times.
Press the Preset 3 key twice.
Press the Preset 4 key once.
(4) Press and hold the DISP key for 3 seconds until
"APPROVED" is displayed.
(5) Exit from the test mode. (See " 2. How to exit from the
test mode")
(Note) All Clear is not applicable to the security code of
this model.
3. Simplified method of clearing the security code (K Type
only)
(1) While the code entry is requested, press and hold the
VOL UP key for 3 seconds while holding the DISP key pressed. (This should turn "----" off.)
(2) Enter "KCAR" from the remote. (Same way as the 00
model) Press the 5 key on the remote twice, then press the Track Up key. (This enters "K".) Press the 2 key on the remote 3 times, then press the Track Up key. (This enters "C".) Press the 2 key on the remote once, then press the Track Up key. (This enters "A".) Press the 7 key on the remote twice, then press the Track Up key. (This enters "R".)
(3) The security code is cleared and the unit enters the
ALL OFF mode.
(4) If you commit a mistake in the code entry, the unit
enters the code request mode again.
4. Method of writing the Mask key while the EEPROM is in the initial status
(1) Enter the test mode. (See " 1. How to enter the test
mode")
(2) Press the CLK key to enter the Mask key registration
mode. "TRANSMIT1" should be displayed now. The display at this time should show " < > " in place of " [ ] ".
(3) Point the Mask key remote toward the light sensor,
and press and hold its key for more than 0.5 second.
(4) When "TRANSMIT2" is displayed, press and hold the
key on the Mask key remote for more than 0.5 second again. The first and second counter codes are not compared at this time.
(5) When "APPROVED" is displayed, the write operation
is complete. Now the demonstration mode is initiated and the test mode is terminated.
(Note) In the same way as previous models, if 30 minutes
have elapsed with no code written, an error occurs and the power is turned OFF.
5. Method of initializing the Mask key
(How to reset the unit from the Mask key approved condi­tion to the factory condition)
(1) Enter the test mode. (See " 1. How to enter the test
mode")
(2) "TRANSMIT1" is displayed and the Mask key entry
request mode is initiated. The display at this time should show " ✽ ✽" in place of " [ ] ".
(3) Press and hold the key on the Master key remote for
more than 3 seconds.
(4) When "TRANSMIT2" is displayed, press and hold the
key on the Master key remote for more than 3 sec­onds again.
(5) When "APPROVED" is displayed, the Mask key is
cleared, the demonstration mode is initiated, the test mode is terminated and the unit returns to the factory condition.
6. Method of clearing all Mask key-related data
(1) Enter the test mode. (See " 1. How to enter the test
mode")
(2) Press the CLK key to enter the Mask key registration
mode. "TRANSMIT1" should be displayed now.
(3) Point the Master key remote toward the light sensor,
and press and hold its key for more than 3 seconds (until the level display shows the full condition).
(4) When "TRANSMIT2" is displayed, hold the key on the
Mask key remote for more than 3 seconds again. If "TRANSMIT1" is displayed in place of "TRANS­MIT2", restart the procedure from step (3).
(5) When "APPROVED" is displayed, all security data is
cleared and the unit returns to the condition before Mask key writing with the EEPROM in the initial sta­tus.
TEST MODE
7
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