LG RCT689H Service Manual page 20

OVERALL WIRING DIAGRAM
VCR PART
ELECTRICAL
ADJUSTMENT PROCEDURES
1. SERVO ADJUSTMENT ...............................3-3
VCR ELECTRICAL
TROUBLESHOOTING GUIDE
1. POWER (SMPS) CIRCUIT ..........................3-4
2. SYSTEM/KEY CIRCUIT ...............................3-8
3. SERVO CIRCUIT .........................................3-9
4. Y/C CIRCUIT ..............................................3-11
5. HI-FI CIRCUIT ............................................3-13
6. TUNER/IF CIRCUIT ...................................3-14
WAVEFORMS
................................................3-16
1. AUDIO BLOCK
(WHEN 1kHz SIGNWAVE IS OUTPUT) ....3-16
BLOCK DIAGRAMS
1. POWER (SMPS) BLOCK DIAGRAM .........3-19
2. SYSTEM BLOCK DIAGRAM .....................3-21
3. A/V CODEC BLOCK DIAGRAM ................3-23
4. HI-FI BLOCK DIAGRAM ............................3-25
5. AVCP BLOCK DIAGRAM ..........................3-27
6. TUNER BLOCK DIAGRAM ........................3-29
7. VIDEO SIGNAL BLOCK DIAGRAM ...........3-31
8. AUDIO SIGNAL BLOCK DIAGRAM ..........3-33
CIRCUIT DIAGRAMS
1. POWER (SMPS) CIRCUIT DIAGRAM ......3-35
2. TUNER CIRCUIT DIAGRAM .....................3-37
3. AVCP CIRCUIT DIAGRAM ........................3-39
4. HI-FI CIRCUIT DIAGRAM ..........................3-41
5. SYSTEM CIRCUIT DIAGRAM ...................3-43
6. I/O MICOM CIRCUIT DIAGRAM ...............3-45
7. I/O JACK CIRCUIT DIAGRAM ...................3-47
8. HDMI CIRCUIT DIAGRAM
(HDMI MODEL ONLY) ...............................3-49
9. VIDEO/AUDIO CODEC, MSP
CIRCUIT DIAGRAM ...................................3-51
10. KEY CIRCUIT DIAGRAM ...........................3-53
• CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT BOARD
DIAGRAMS
.....................................................3-61
SECTION 3
ELECTRICAL
CONTENTS
...................3-2
.................3-3
....................3-4
....................................3-19
..................................3-35
...................3-55
1. VCR P.C.BOARD .......................................3-61
2. SMPS P.C.BOARD ....................................3-65
3. HDMI P.C.BOARD .....................................3-65
4. KEY P.C.BOARD ......................................3-67
VDR PART
VDR ELECTRICAL
TROUBLESHOOTING GUIDE
1. NO COMPONENT VIDEO SIGNAL
WHEN PLAYING DISC ..............................3-71
2. NO COMPOSITE SIGNAL
WHEN PLAYING DISC ..............................3-72
3. NO TV, EXTERNAL INPUT
VIDEO SIGNAL..........................................3-73
4. WHEN PLAYING DISC,
NO AUDIO OUTPUT (IN VCR BOARD) ....3-74
5. NO OPTICAL/DIGITAL OUTPUT ...............3-75
6. SYSTEM CIRCUIT PART (DISPLAY
"HELLOW" ON THE WINDOW) .................3-76
WAVEFORMS
................................................3-77
1. SYSTEM BLOCK .......................................3-77
2. DV BLOCK (TPA±, TPB±) .........................3-79
3. USB BLOCK (D±) ......................................3-80
BLOCK DIAGRAMS
1. VDR SET TOTAL BLOCK DIAGRAM ........3-81
2. VDR MAIN H/W BLOCK DIAGRAM ..........3-83
3. DVD POWER BLOCK DIAGRAM ..............3-85
4. AUDIO IN/OUT BLOCK DIAGRAM ...........3-87
5. VIDEO IN/OUT BLOCK DIAGRAM ............3-89
6. DV1394, USB BLOCK DIAGRAM ..............3-91
CIRCUIT DIAGRAMS
1. MPEG CIRCUIT DIAGRAM .......................3-93
2. DDR, LATCH, FLASH, RESET
CIRCUIT DIAGRAM ...................................3-95
3. DV1394, INTERFACE CON
CIRCUIT DIAGRAM ...................................3-97
4. RF IC, MOTOR DRIVE IC
CIRCUIT DIAGRAM ...................................3-99
5. DSP CIRCUIT DIAGRAM ........................3-101
• CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT BOARD
DIAGRAMS
...................................................3-105
1. VDR & LOADER P.C.BOARD .................3-105
3-1
..................3-71
....................................3-81
..................................3-93
...............3-103