Sharp MD-X8 Service Manual Page 78
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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• Normal playback
Is initialization performed normally when high reflection disc is
played back?
Does disc rotate normally?
No No
Check IC1201
Is lead-in switch turned on in the TEST mode when the pickup is on
the innermost periphery (Is the pin 6 of OC1401 on L level?)
No
No
Check SW1953, mechanism switch PWB soldering joint, and
CNP1601 pin 1 periphery.
Is an attempt to read repeatedly the TOC section of low reflection
disc made?
Since the TOC section has not been recorded on the new disc,
replace it with recorded low reflection disc.
No
Yes
Check the position as stated in item "lead-in switch position
measurement mode" (high reflection disc adjustment).
Yes
When it has been confirmed that EEPROM value is normal in the TEST mode
Does the playback time display advance?
• Audio playback circuit
Yes
No
Is audio output waveform observed on the pins 22 and 24 of
CNS1901?
Check connection between IC1701 and CNS1901.
No
Check the system PWB and power PWB.
Yes
When sound is not output although the playback time display advances during playback in the normal mode.
Is audio output waveform observed on the pins 24 to 26 of
IC1701?
Check the pins 70, 71, 72 and 74 of IC1201, and the pins
12, 16, 17, and 19 of IC1701.
- 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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