3-1
SECTION 3
ELECTRICAL
CONTENTS
LCD PART
...................................................................................................................................................3-2
LCD ELECTRICAL TROUBLESHOOTING GUIDE
.........................................................................3-3
BLOCK DIAGRAM
......................................................................................................................................3-5
CIRCUIT DIAGRAM
...................................................................................................................................3-7
PRINTED CIRCUIT DIAGRAM
...............................................................................................................3-9
MAIN PART
...............................................................................................................................................3-11
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
.....................................................................3-11
1. POWER (DC-DC CONVERTER) CIRCUIT..........................................................................................3-11
2. MPEG CIRCUIT ...................................................................................................................................3-14
3. RF/SERVO CIRCUIT............................................................................................................................3-15
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
.................................3-19
1. SYSTEM 27MHZ CLOCK, RESET & FLASH R/W SIGNAL................................................................3-19
2. SDRAM CLOCK ...................................................................................................................................3-19
3. DISC TYPE JUDGEMENT WAVEFORM .............................................................................................3-20
4. FOCUS ON WAVEFORM.....................................................................................................................3-22
5. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)..............................................................3-22
6. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) ..................................................3-23
7. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) ..........................................................3-24
8. MT1389 VIDEO OUTPUT WAVEFORM ..............................................................................................3-24
9. AUDIO OUTPUT FROM AUDIO DAC..................................................................................................3-25
WIRING CONNECTION DIAGRAMS
..................................................................................................3-26
1. WIRING CONNECTION DIAGRAM 1 ..................................................................................................3-26
2. WIRING CONNECTION DIAGRAM 2 ..................................................................................................3-27
BLOCK DIAGRAMS
.................................................................................................................................3-28
1. OVERALL BLOCK DIAGRAM ..............................................................................................................3-28
2. POWER BLOCK DIAGRAM.................................................................................................................3-29
3. SERVO BLOCK DIAGRAM..................................................................................................................3-30
4. SYSTEM BLOCK DIAGRAM................................................................................................................3-31
5. AV BLOCK DIAGRAM ..........................................................................................................................3-32
CIRCUIT DIAGRAMS
..............................................................................................................................3-33
1. MPEG CIRCUIT DIAGRAM .................................................................................................................3-33
2. MEMORY CIRCUIT DIAGRAM ............................................................................................................3-35
3. OPU & MOTOR CIRCUIT DIAGRAM ..................................................................................................3-37
4. AV CIRCUIT DIAGRAM........................................................................................................................3-39
5. CHARGE CIRCUIT DIAGRAM.............................................................................................................3-41
6. FM-TX (OPTION) CIRCUIT DIAGRAM................................................................................................3-43
7. PANEL I/F CIRCUIT DIAGRAM ...........................................................................................................3-45
8. MENU KEY CIRCUIT DIAGRAM .........................................................................................................3-47
9. FRONT KEY CIRCUIT DIAGRAM .......................................................................................................3-49
• CIRCUIT VOLTAGE CHART
..............................................................................................................3-51
PRINTED CIRCUIT DIAGRAMS
..........................................................................................................3-55
1. MAIN P.C.BOARD ................................................................................................................................3-55
2. KEY MENU P.C.BOARD ......................................................................................................................3-59
3. KEY FRONT P.C.BOARD.....................................................................................................................3-59
Summary of Contents for DP270B
Page 15: ...3 6 MEMO ...
Page 17: ...3 9 3 10 PRINTED CIRCUIT DIAGRAM TOP VIEW BOTTOM VIEW MEMO ...
Page 34: ...3 27 2 WIRING CONNECTION DIAGRAM 2 MAIN PCB KEY PCB MAIN PCB Key PCB ...
Page 51: ...3 55 3 56 1 MAIN P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAMS ...
