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CASSETTE RECEIVER
KRC-508S
KRC-688
SERVICE MANUAL C 2000-3 PRINTED IN KOREA
B51-7599-00 ( K ) 1785
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).
KRC-688 Panel assy Front glass assy
(A64-2088-08) (B10-3209-08)
KRC-688
PWR
OFF
DISC PROG
DAB
45W X 4
EJECT
B NR SCAN B.S/RDM REP D.SCN MTL/M.RDM MENU
AUTO DISP
LOUD AME NAME.S
AUD
DISC
Panel assy Front glass assy Escutcheon assy
KRC-508S (A64-2088-08) (B10-3208-08) (B07-2195-08)
KRC-508S
PWR
OFF
DISC PROG
DAB
45W X 4
EJECT
B NR SCAN B.S/RDM REP D.SCN MTL/M.RDM MENU
AUTO DISP
LOUD AME NAME.S
AUD
DISC
Escutcheon assy
(B07-2195-08)
Escutcheon Lever Stay Screw set Screw set
(B07-2186-08) (D10-4514-08) (J54-0611-08) (N99-1689-08) (N99-1688-08)
Plastic cabinet assy DC cord assy Mounting hardware assy Remote controller assy Size AAA battary
(A02-1494-08) (E30-4864-08) (J21-9585-08) (A70-0883-05) (Not supplied)
: KRC-688 only : KRC-688 only
40%
KRC-508S/688
2
FM(K,M) : 1660mV FM(K,M) : 400Hz 75KHz Dev E: KRC-578R/RY
FM(E) : 1280mV FM(E) : 400Hz 40KHz Dev
AM(K,M) : 560mV AM : 400Hz 30% Mod K: KRC-508S
ANT AM(E) : 730mV CASS : 1KHz 0dB M: KRC-680R/688
CASS : 1490mV CD-CH : 1KHz 0dB
(K,M) : 350mV CD-CH : 2900mV
TU100 (E) : 170mV IC300 IC500
FM FRONT FRONT FRONT
TUNER (K,M) : 150mV
SGS-IC (E) : 140mV FM(K,M) : 1660mV
FM(E) : 1280mV
AM AM(K,M) : 560mV
AM(E) : 730mV POWER IC
2
E PROM E-VOL CASS : 1490mV TDA7386
CD-CH : 2900mV
IC200 310mV
TDA7400D
REAR REAR REAR
CASS
EQ-AMP
FRONT
1200mV FM(K,M) : 1530mV
FRONT
FM(E) : 1180mV
BLOCK DIAGRAM
CXA2560Q CD-CH
AM(K,M) : 510mV
MS. B/NR NOISE AMP 10K AM(E) : 670mV
CASS : 1370mV
KRC-680R CD-CH : 2650mV
USED
KRC-508S KRC-680R/578R/RY REAR
KRC-688 REAR
FM(K,M) : 1530mV
IC150 10K FM(E) : 1180mV
AM(K,M) : 510mV
AM(E) : 670mV
RDS DETECTOR CASS : 1370mV
CD-CH : 2650mV
TDA7479D
CXA2559Q
MS
BU 14V
KRC-578R/RY IC1
Q610
BU 5V
BU 5V
CASSETTE MECHA Q1
SW 5V
(D40-1141-08) SW 5V
Q5
IC250 u-COM PNL 5V
PNL 5V
MOTOR-Dr UPD784217AGF503
BA6219BFP-Y Q622 Q621
AIDIO 8V
AUDIO 8V SW 14V
CD-CH Q618
REMO SERVO 14V
SERVO 14V
Q616
MOTOR 14V
MOTOR 14V
IC900
RST KEY MATRIX Q612
ILL 11V
LCD-Dr ILL 11V
LC75883E
LCD KRC-680R/578R/RY/508S/688
KRC-508S/688
MICROCOMPUTER'S TERMINAL DESCRIPTION
784217AGF503(504)(IC1 : MAIN UNIT)
Pin Pin Name Signal Name I/O Purpose Operation Description
1 P60/A16 ST_TYPE1 I E-VOL setting selection input DEFAULT:LO
2 P61/A17 ST_TYPE2 I E-VOL setting selection input DEFAULT:LO
Genuine/generally-marketed identification
3 P62/A18 JS_TYPE1 I DEFAULT:LO
input.
4 P63/A19 TYPE1 I Destination type switching input 1
5 P64/RD TYPE2 I Destination type switching input 2
6 P65/WR TYPE3 I Destination type switching input 3
7 P66/WAIT NC O Not used
8 P67/ASTB NC O Not used
9 Vdd - Positive power supply pin
10 P100/TI5/TO5 AMP_SVR O Power IC reset control Power ON: Lo.
Standby canceled: Hi.
11 P101/TI6/TO6 AMP_STBY O Power IC standby control
Standby mode: Lo.
12 P102/TI7/TO7 AMP_MUTE O Power IC muting control Muting ON: Lo. Muting OFF: Hi.
13 P103/TI8/TO8 NC O Not used
14 P30/TO0 ACC_DET I Acc detection input ACC OFF:HI ACC ON:LO
15 P31/TO1 BU_DET I B-U detection input B-U down: Hi. B-U normal: Lo.
16 P32/TO2 SMALL I Small input Dimmer ON: Lo. Dimmer OFF: Hi.
17 P33/TI1 P_CONT O Power control ON:HI OFF:LO
18 P34/TI2 P_ANT O Power antenna control TUNER: Hi. Other sources: Lo.
19 P35/TI00 REMO I Remote control input
20 P36/TI01 P_ON O Internal power control ON:HI OFF:LO
21 P37 ILL_ON O LED lighting control output Lighting ON: Hi. Lighting OFF: Lo.
22 TEST - IC test pin
23 P90 IC2_SDA I/O E-VOL/E's + data input/output
24 P91 IC2_SCK O E-VOL/E' + clock output
25 P92 MUTE O Muting control Muting ON: Hi. Muting OFF: Lo.
26 P93 SW5V O SW 5 V control ON:LO OFF:HI
27 P94 F/E_DATA I/O IC3 data input/output
28 P95 F/E CLK O IC 3 clock output
29 P120/RTP0 CH_CON O CH control ON:HI
30 P121/RTP1 CH_REQH O CH send request output Requested: Lo.
31 P122/RTP2 NC O Not used
32 P123/RTP3 NC O Not used
33 P124/RTP4 C-MAIN_M O C-mechanism main motor control ON:HI OFF:LO
34 P125/RTP5 C-SUB_M+ O C-mechanism loading motor control
35 P126/RTP6 C-SUB_M- O C-mechanism loading motor control
36 P127/RTP7 NC O Not used
37 Vdd - Positive power supply pin
38 X2 - Main system clock oscillator pin
39 X1 - Main system clock oscillator pin
40 Vss - GND pin
41 XT2 - Sub-system clock oscillator pin
42 XT1 - Sub-system clock oscillator pin
43 RESET I System reset input pin
44 P00/INTP0 NC O Not used
45 P01/INTP1 RDS_CLK I RDS clock input
46 P02/INTP2/NMI CH_REQC I CD-CH send request input Requested: Lo.
47 P03/INTP3 LCD_DATAL I Data input from LCD driver
48 P04/INTP4 C-MODE_1 I C-mechanism mode detection 1 input
49 P05/INTP5 C-MODE_2 I C-mechanism mode detection 1 input
50 P06/INTP6 C-MODE_3 I C-mechanism mode detection 1 input
3
KRC-508S/688
MICROCOMPUTER'S TERMINAL DESCRIPTION
784217AGF503(504)(IC1 : MAIN UNIT)
Pin Pin Name Signal Name I/O Purpose Operation Description
51 AVdd - A/D analog power pin
52 AVref0 - A/D reference voltage input pin
<1 V: PHONE. >
53 P10/ANI0 PHONE I PHONE detection input
2.5 V: Navigation muting.
54 P11/ANI1 NC I Not used
55 P12/ANI2 NOISE I FM noise detection input
56 P13/ANI3 S-METER I FM S-meter input
57 P14/ANI4 NC I Not used
58 P15/ANI5 NC I Not used
59 P16/ANI6 REEL_S I C-mechanism supply reel detection
60 P17/ANI7 REEL_T I C-mechanism take-up reel detection
61 AVss - A/D and D/A GND pin
62 P130/ANO0 NC O Not used
63 P131/ANO1 NC O Not used
64 AVref1 - D/A reference voltage input pin
65 P70/RxD2/SI2 CH_DATAC I Data input from CD-CH
66 P71/TxD2/SO2 CH-DATAH O Data output to CD-CH
67 P72/ASCK2/SCK2 CH_CLK I/O CD-CH clock input/output
68 P20/RxD1/SI1 LCD_DATAL I Data input to LCD driver
69 P21/TxD1/SO1 LCD_DATAS O Data output from LCD driver
70 P22/ASCK1/SCK1 LCD_CLK O Clock output to LCD driver
71 P23/PCL NC O Not used
72 P24/BUZ BEEP O Beep output
73 P25/SI0 NC O Not used
74 P26/SO0 PNL_DET1 I Panel detection
75 P27/SCK0 NC O Not used
76 P80/A0 LCD_INH O Reset output to LCD driver
77 P81/A1 LCD_CE O CE output to LCD driver
78 P82/A2 SRT_SW1 I SRT position detection input
79 P83/A3 SRT_SW2 I SRT position detection input
80 P84/A4 NC O Not used
81 P85/A5 NC O Not used
82 P86/A6 NC O Not used
83 P87/A7 C-MSC O EQ amp FF/PLAY control PLAY:HI OFF:LO
84 P40/AD0 C-F/R O Tape transport direction switching FWD:LO REV:HI
85 P41/AD1 C-MUTE O Tape muting control MUTE:HI
86 P42/AD2 C-MS_IN I Inter-music pulse detection
87 P43/AD3 C-MTL O MTL ON/OFF control ON:HI OFF:LO
88 P44/AD4 C-NR O Dolby ON/OFF control ON:HI OFF:LO
89 P45/AD5 NC O Not used
90 P46/AD6 NC O Not used
91 P47/AD7 RDS_DATA I Data input from RDS decoder
92 P50/A8 RDS_QUAL I Quality input from RDS decoder
During reception: Hi.
93 P51/A9 AFC O PLL high-speed lock-up pin
During search: Lo.
94 P52/A10 FM/AM_SD I FM/AM SD input Station detected: Hi.
95 P53/A11 IF_COUNT I Not used
96 P54/A12 NC O Not used
97 P55/A13 AM+B O AM power control ON:HI
98 P56/A14 FM+B O FM power control ON:HI
99 P57/A15 NC O Not used
100 Vss - GND pin
4
KRC-508S/688
TEST MODE
(1) How to enter the test mode Example: To enter "3510",
While holding the FM and Preset 6 keys simultaneously, - Press the Preset 1 key 4 times.
reset the unit. - Press the Preset 2 key 6 times.
All indicators and display segments are ON at the start of - Press the Preset 3 key 2 times.
test mode. - Press the Preset 4 key once.
7. Press and hold the DISPLAY key for 3 seconds to dis-
(2) How to exit from the test mode play "APPROVED".
Reset the unit. 8. Quit the test mode (See (2) How to exit from the test
(Note) The test mode cannot be canceled by turning Acc mode.)
OFF, power OFF or momentary power down.
(8) How to clear the simple security code (K type only)
(3) (return to beginning) 1. While the code is requested, press and hold the DISP
Pressing the Track Down key jumps to the previous track key and press and hold the VOL Up key for 3 seconds.
to the track being played. ("----" disappears.)
2. Enter "KCAR" from the remote control unit. (Same
(4) Test mode specification of the tape operation as the '98 model)
o The Blank Skip is initially OFF. - Press numeric key 5 twice then press the Track Up
key. (This enters "K".)
(5) Audio - Press numeric key 2 three times then press the
o The volume is -10 dB (displayed as 30). Track Up key. (This enters "A".)
o LOUD is OFF, and CRSC is also OFF whether the - Press numeric key 2 once then press the Track Up
function is provided or not. key. (This enters "A".)
o With the Bass/Treble and Balance/Fader controls, - Press numeric key 7 twice then press the Track Up
pressing the Up/Down key switch the setting alternate- key. (This enters "R".)
ly to: Full Boost => Full Cut => Full Boost, Full Right -> 3. The security is canceled and the unit enters the
Full Left => Full Right, or Full Front ~> Full Rear => TUNER mode.
Full Front.
o With the high-pass filter, pressing the Up key sets it to (9) Other
Through/100 Hz/200 Hz and pressing the Down key o The DNPP/SBF key of the remote control unit (RC-510)
sets it to 200 Hz/100 Hz/Through. functions as the menu mode ON/OFF key.
o Other adjustments function in the same way as normal o The OPEN/CLOSE key of the remote control unit (RC-
mode. 510) functions as the audio adjustment mode ON/OFF
key.
(6) Backup current measurement o The menu is displayed by displaying only the required
When the unit is reset (backup turned on) while Acc is features.
OFF or when Acc is turned OFF in test mode, the MUTE o Message such as "CODE OFF" is not displayed when
terminal goes on in 2 seconds, instead of 1.5 second. power is turned ON.
(The panel, CD, C and MD mechanisms are not activated o The contrast can be adjusted only to 0/5/10 using the
at this time.) Up/Down keys.
(7) Security code registration after E2PROM replacement
servicing (E/M type only)
1. Enter the test mode. (See (1) How to enter the test
mode.)
2. Press the SRC key to set All OFF.
3. Press and hold the AUDIO key for 1 second to enter
menu mode.
4. Press the FM/AM key to select "SECURITY".
5. Press and hold the Track Up/Down for 2 seconds.
6. Enter the code by pressing the Preset 1, 2, 3 and 4
keys.
5
KRC-508S/688
ADJUSTMENT
TUNER
INPUT OUTPUT ALIGNMENT
No ITEM (RECEIVER) ALIGN FOR FIG.
SETTINGS SETTINGS POINTS
SETTINGS
CASSETTE DECK SECTION
Connect a Adjust the azimuth for each
TCC-153 Head Azimuth
[1] AZIMUTH AC voltmeter TAPE PLAY Lch/Rch or FWD/RVS
10kHz Screw
to SP OUT becomes maximum
Connect a
PLAY BACK VR200A (L)
[2] TCC-130 AC voltmeter TAPE PLAY 300mV (a)
LEVEL VR200B (R)
to CN200
F/E
VR200A Lch
CASSETTE
MECHANISM VR200B Rch (a) 300mV
L
CN200 G
R
AC voltmeter
ATTENTION OF ASSEMBLY
Assembly of FPC(Flexible PC board) onto Roller ass'y
Turn Roller ass'y by 4 times.
Hook the end of Roller ass'y to the tongue.
Insert the FPC into the slit of Roller ass'y then release the end of Roller ass'y and the tongue.
FPC
tongue
Turn 4 times.
End of Roller ass'y
6
A B C D E F G H I J
PC BOARD(Component side view)
1 CONTROL UNIT
MAIN UNIT
S927
D917
D918
JC2
D501
EJECT
TH500
IC500
PROG
S903
R508
C601
2 24 R920
S917
S929
JW1
RST
CN600 L600 C600 CN350
R921
1 25
S908 S926
C354
C505A
S902
R351
R350
C503A 3 1 6 4
13 11 12 8 4 3 2 9 16
C507
D903
JW7
13
CN400 9 10 6 7 5 1 17 C506 R504 C510 2 5
S915
JW4
FM S916
8 1 C602 C504A C505B
D904 12
S910
JW8
JC52
R408
R406
R400 C503B C512
18 R356B R356A R357B R357A
R402
SRC
R401B R505
R352A
D902
R404 D350A
AM
D401 D400B
R403
R354B R354A R355B R355A
JW5
C400 D600 C502A
Q350B
R407
E B E B
D505A