Sharp MD-X8 Service Manual Page 81
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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MD-X8
IC901 RH-iX2679AFZZ:System Control Micon (iX2679AF) (1/3)
1 RESET P60 Output Reset signal for MD microcomputer
2 S-ID P61 Output Track mark signal and MD ON/OF control signal for MD
3 LOAD P62 Input MD loading switch detection DISC IN = H
4 SYN P63 Output Connection of crystal for main system clock oscillation
5 DATA P64 Output 12-bit serial data output to serial-parallel conversion element MSB fast
transmission
6 CLK P65 Output 12-bit serial clock output to serial-parallel conversion element Data taking-in
with H edge at serial-parallel conversion element sid
7 LCK1 P66 Output Latch clock for serial-parallel conversion element 1 H pulse output Output to
port with H edge at serial-parallel conversion element side
8 LCK2 P67 Output Latch clock for serial-parallel conversion element 2 H pulse output Output to
port with H edge at serial-parallel conversion element side
9 — VDD — To be connected to VDD
10 CSB P100 Output Chip selection output to LCD driver
11 RS P101 Output Display/command recognition output to LCD driver
Display RAM data: L output, command data: H output
12 WRB P102 Output Read output to LCD driver
When L output is given, the LCD driver side becomes data pass state.
13 RDB P103 Output Write output to LCD driver When L output is given, the LCD driver side
becomes active, and data is taken in with H edge.
14 D0 P30 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
15 D1 P31 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
16 D2 P32 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
17 D3 P33 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
18 D4 P34 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
19 D5 P35 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
20 D6 P36 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
21 D7 P37 Input/Output Input/output port to send and receive parallel data for D0 to D7 to and from
LCD driver
22 — TEST — To be connected to VDD
23 Motor voltage P90 Output EH mechanism motor control Nch open drain
L/H (Externally provided PULL UP is required)
24 Cam motor P91 Output EH mechanism motor control Nch open drain
forward rotation (Externally provided PULL UP is required)
25 Cam motor P92 Output EH mechanism motor control Nch open drain
reverse rotation (Externally provided PULL UP is required)
26 Tray motor P93 Output EH mechanism motor control Nch open drain
forward rotation (Externally provided PULL UP is required)
27 Tray motor P94 Output EH mechanism motor control Nch open drain
reverse rotation (Externally provided PULL UP is required)
28* Not used P95 Output EH mechanism motor control Nch open drain
(Externally provided PULL UP is required)
29 Cam SW1 P120 Input Detection input of cam SW1 to SW4 L: SW ON, H: SW OFF
30 Cam SW2 P121 Input Detection of 14 cam positions
(drum position) by applying the combination of SW1 to SW4
31 Cam SW3 P122 Input Detection of 14 cam positions
(drum position) by applying the combination of SW1 to SW4
32 Cam SW4 P123 Input Detection of 14 cam positions
(drum position) by applying the combination of SW1 to SW4
FUNCTION TABLE OF IC
Pin No.
FunctionTerminal Name
Input/Output
Port Name
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
- 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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