Sharp MD-X8 Service Manual Page 39
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MD-X8
Figure 39 SCHEMATIC DIAGRAM (2/20)
7
8 9 10 11 12
12345678
123456789
10 11
1314 1216171819 152122 20
1 23 4 56 78 9
10 11 12
131415161718192021222324
+B
32
IC303:
FM IF DET./
FM MPX./
AM IF
AM SIGNALFM SIGNAL
AM BAND
COVERAGE
MAIN PWB-A(1/3)
FM 75
ohms
GND
ANTENNA
TERMINAL
AM
GND
FM FRONT END
VT
F OUT
IF OUT
ANT
GND
GND
GND
VCC
FM IF AMP.
FM MUTE
LEVEL
AMTRACKING
IC302:
PLL
CONTROLLER
X IN X OUT
VSS
AOUT
AIN
PD
MW
FM
VDD
AM IN
FM IN
FM
NC
NC
MO/ST
IF IN
ST IND
CE
DI
CL
DO
NC
3
2
1
FM IF
3
2
1
IN
AM OSC
OUT
AM MIX
OUT
AM OSC
FM IF
IN
REG
FM AFC
AM RF IN
VSM
FM/AM
OUT
AM LOW
CUT
IN
AM IF
SD
GND
STEREO
FM DET
VCC
PHASE
IF OUT
MPX VCO
MPX IN
R-CH OUT
L-CH OUT
MO/ST
PHASE
(FM/AM)
MUTING
TUNER
MUTE
TUN MUTE
TO SYSTEM
P40(1-8) P41(7-12)
HGFEDCBA
SD
D GND
CL
DO
CE
DI
SM
O
N
L
K
J
I
TUN_RCH
TUN_GND
TUN_LCH
A_10V
TP
(UJ)
32
0V
0V
3.6V
0V
11.1V 11V
0V
0V
0V
0.6V
0V
0.6V
10V
4.8V
9.4V
0V
0.8V
4.9V
1
+B
+B
R376
1K
C386
330P
R379
2.2K
R371
1K
Q371
KTA1266 GR
R378
82K
C373
0.018
R363
1.2K
R364
1.2K
SO301
R349
33
Q301
2SC380 O
R348
680
R347
6.8K
R399
33
C348
0.01
R372
1K
R373
1K
R374
1K
C368
1/50
R356
1K
C367
1/50
R350
2.7K
R351
5.6K
C374
0.018
ZD351
UZ5.1BSB
C396
100/10
R392
390
C395
0.022
R391
390
L352
100µH
D302
1SS133
C301
0.001
D304
1SS133
D303
1SS133
C302
0.001
C338
0.001
D301
1SS133
FE301
C341
0.022
C383
150P
R344
680
R345 4.7K
C347
0.022
C346 0.022
C345 0.022
L342
2.2µH
R369
1.2K
R346
330
C 349
0.022
C340 100/16
R382
150
C331
0.047
C361
0.022
C362
3.3/50
C343
33P
VR351
10K(B)
C350
0.022
C352
10/16
C353
0.022
C354
0.022
CF351
D352
1SS133
D351
1SS133
C332
0.022
R383
5.6K
C397
0.022
L353
1mH
R393
1K
R384
5.6K
Q360
KTA1266 GR
R385
5.6K
C391
47/16
R360
4.7K
R359
1.8K
R395
47K
D353
1SS133
C392
0.001
C387
0.022
C394
47/16
R381
10K
R380
1.5K
C393
1/50
C371
1/50
R361
4.7K
C372
1/50
R362
4.7K
C366
0.001
C363
0.022
C399
0.022
C398
100/10
C356
0.001
R354
3.9K
C334
10/50
C333
0.022
C330
6.8P
R319
100K
T302
ZD352
MTZJ3.9B
Q361
KRC107 M
R387
22K
C380
10/16
IC302
LC72131
T351
CF352
R352
1K
CF302
C384
0.001
C358
1/50
R355
3.3K
C357
2.2/50
C370
1/50
C355
22P
IC303
LA1832
C351
0.022
R353
270
C342
0.022
C336
0.022
R358
8.2K
C364
10/16
C365
0.022
R357
470K
X351
10.7MHz
Q354
KTC3199 GR
Q353
KTC3199 GR
R367
1K
C375
3.3/50
R365
10K
R368
33K
R366
10K
L351
100µH
R377
47K
C385
0.01
X352
4.5MHz
C381
12P
(CH)
C382
15P
(CH)
C376
0.022
FM IF
C389
5600P
C390
5600P
R397
5.6K
R398
5.6K
TO SYSTEM P40(1-8) P41(7-12)
AM IF
2.4V
0V
0.9V
4.9V
2.5V
0V
0V
4.9V
3.8V
0V
0.2V
4.9V
0V
2.4V
0V
0V
0V
0V
2.2V
0V
1V
1V
9
8
7
6
5
4
3
2
1
22
21
20
19
18
17
16
15
14
13
12
11
10
PIN
NO.
VOLTAGE
IC302
4.9V
3.6V
3.6V
1V
2.3V
2.1V
1.3V
3.6V
3.6V
3.7V
4.9V
4.95V
4.8V
0V
2.1V
4.9V
2.1V
2.1V
2..8V
3.8V
1.3V
1.2V
0V
3.5V
9
8
7
6
5
4
3
2
1
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
PIN
NO.
VOLTAGE
IC303
R324
10K
- SERVICE MANUAL 1
- SPECIFICATIONS 2
- IMPORTANT SERVICE NOTES 2
- NAMES OF PARTS 3
- REMOTE CONTROL 4
- MINIDISC SYSTEM LIMITATIONS 5
- If a problem occurs 6
- TROUBLESHOOTING 6
- MD / CD STEREO 7
- Quick-Guide 7
- Guía rápida 7
- DISASSEMBLY 8
- Figure 10-2 10
- Figure 10-3 10
- Figure 10-1 10
- MD Mechanism 11
- MD MECHANISM SECTION 12
- Loading pinch 13
- Fixing washer 13
- (G1) x 1 13
- MD mechanism 13
- CD MECHANISM SECTION 14
- ADJUSTMENT 15
- CD TEST MODE 16
- MD SECTION 17
- • Test Mode 18
- 2. AUTO adjustment mode 19
- 3. RESULT sub-mode 19
- : Measurement value 24
- 8. TEST-PLAY mode 25
- 9. TEST-REC mode 25
- 10. INNER mode 25
- Jitter Meter 26
- EXPLANATION OF ERROR DISPLAY 27
- -PROM Setting Mode Chart 30
- Figure 30 30
- NOTES ON SCHEMATIC DIAGRAM 31
- FAN MOTOR 33
- AC POWER 33
- CORD(265) 33
- M56748FP 35
- TO µ-COM 36
- IX2679AF 37
- MIC PWB-C7 38
- JACK PWB-E 38
- AM SIGNALFM SIGNAL 39
- MAIN PWB-A(1/3) 39
- MAIN PWB-A(2/3) 40
- FM SIGNAL 41
- CD SIGNAL 41
- MAIN PWB-A(3/3) 42
- LC75396E 43
- AUDIO PROCESSOR 43
- MAIN PWB-A 44
- 8 9 10 11 12 45
- FOCUS/TRACKING/ 46
- SPIN/SLIDE DRIVER 46
- MD OPTICAL 48
- PICK UP UNIT 48
- MD MECHANISM SWITCH PWB-H 48
- DISPLAY PWB 50
- LED PWB-C4 50
- SWITCH B PWB-C3 50
- SWITCH C PWB-C5 50
- LAMP PWB-C1 50
- SWITCH A PWB-C2 51
- LAMP PWB-C1 SWITCH A PWB-C2 52
- DISPLAY PWB-C6 53
- POWER PWB-B1 55
- POWER AMP. PWB-B2 57
- SITUATION : 58
- MD MAIN PWB-G 61
- MD MECHANISM SWITCH 62
- MD OPTICIAL PICKUP UNIT 62
- MD PLAYBACK SIGNAL 65
- MD RECORD SIGNAL 65
- MD MAIN PWB -G(TOP) 66
- MD MAIN PWB - G (BOTTOM) 67
- VOLTAGE (MD MAIN PWB) 68
- WAVEFORMS OF CD CIRCUIT 69
- WAVEFORMS OF MD CIRCUIT 70
- D/A CONVERSION PLAY 71
- TROUBLESHOOTING (CD SECTION) 72
- 1.0V/DIV 73
- 0.5µsec/DIV(DC) 73
- (When playing 73
- back the disc) 73
- TROUBLE SHOOTING (MD SECTION) 76
- • Normal playback 78
- • Audio playback circuit 78
- • Focus servo failure 79
- • Disc motor fails to run 80
- • Tracking servo failure 80
- • Slide servo failure 80
- FUNCTION TABLE OF IC 81
- ROM:128K 84
- REF — + 3.15V 89
- PARTS GUIDE 91
- INTEGRATED CIRCUITS 92
- TRANSISTORS 92
- TRANSFORMERS 92
- VARIABLE RESISTORS 93
- VIBRATORS 93
- CAPACITORS 93
- DESCRIPTIONNO 94
- PART CODE NO. PARTS CODE 94
- DESCRIPTION 94
- RESISTORS 95
- DESCRIPTIONPARTS CODE 97
- NO. PART CODE 97
- OTHER CIRCUITRY PARTS 98
- MD MECHANISM PARTS 99
- CD MECHANISM PARTS 100
- CHANGER MECHANISM 100
- CABINET PARTS 100
- OTHER SERVICE PARTS 101
- SPEAKER BOX PARTS 101
- ACCESSORIES 101
- MAIN UNIT 107
- Pad, Remote 107
- Remote Control 107
- ALL RIGHTS RESERVED 108
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