LG RC-185 Service Manual page 15

OVERALL WIRING DIAGRAM
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES
............................................................3-3
VCR ELECTRICAL TROUBLESHOOTING
GUIDE
.............................................................................3-4
1. POWER(SMPS) CIRCUIT .......................................3-4
2. SYSTEM/KEY CIRCUIT ..........................................3-7
3. SERVO CIRCUIT.....................................................3-8
4. Y/C CIRCUIT..........................................................3-11
5. HI-FI CIRCUIT .......................................................3-15
6. TUNER/IF CIRCUIT...............................................3-18
BLOCK DIAGRAMS
................................................3-20
1. POWER(SMPS) BLOCK DIAGRAM......................3-20
2. TU/IF BLOCK DIAGRAM.......................................3-22
3. VPS BLOCK DIAGRAM ........................................3-23
4. Y/C BLOCK DIAGRAM..........................................3-24
5. HI-FI BLOCK DIAGRAM........................................3-26
6. SYSTEM BLOCK DIAGRAM .................................3-28
7. SCART & SWICH BLOCK DIAGRAM ...................3-30
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM ...................3-32
2. TUNER CIRCUIT DIAGRAM .................................3-34
3. A/V CIRCUIT DIAGRAM........................................3-36
4. HI-FI CIRCUIT DIAGRAM .....................................3-38
5. SYSTEM CIRCUIT DIAGRAM...............................3-40
6. SCART CIRCUIT DIAGRAM
(SCART MODEL ONLY).........................................3-42
7. KEY CIRCUIT DIAGRAM ......................................3-44
8. KARAOKE CIRCUIT IAGRAM
( KARAOKE MODEL ONLY ).................................3-46
9. HDMI CIRCUIT DIAGRAM
( HDMI MODEL ONLY ).........................................3-48
• WAVEFORMS .........................................................3-50
• CIRCUIT VOLTAGE CHART ...................................3-52
PRINTED CIRCUIT DIAGRAMS
1. VCR P.C.BOARD(TOP VIEW) ...............................3-56
2. VCR P.C.BOARD(BOTTOM VIEW).......................3-58
3. SMPS P.C.BOARD ................................................3-60
4. HDMI P.C.BOARD(HDMI MODEL ONLY) .............3-62
5. KARAOKE P.C.BOARD
(KARAOKE MODEL ONLY)...................................3-62
6. KEY P.C.BOARD ...................................................3-64
SECTION 3
ELECTRICAL
CONTENTS
..............................3-2
..............................................3-32
.........................3-56
VDR PART
VDR ELECTRICAL TROUBLESHOOTING
GUIDE
...........................................................................3-66
1. POWER(SMPS) CIRCUIT .....................................3-66
2. NO COMPONENT VIDEO SIGNAL WHEN
PLAYING DISC ......................................................3-69
3. NO COMPOSITE / S-VIDEO SIGNAL WHEN
PLAYING DISC ......................................................3-70
4. NO TV, EXTERNAL INPUT VIDEO SIGNAL.........3-71
5. WHEN PLAYING DISC, NO AUDIO OUTPUT ......3-72
6. NO OPTICAL / DIGITAL OUTPUT ........................3-73
7. NO TUNER AUDIO OUTPUT ................................3-74
8. NO EXTERNAL INPUT 1, 2, 3 AUDIO ..................3-75
BLOCK DIAGRAMS
1. VDR SET TOTAL BLOCK DIAGRAM ....................3-76
2. VDR MAIN H/ W BLOCK DIAGRAM.....................3-77
3. POWER BLOCK DIAGRAM ..................................3-78
4. AUDIO IN/OUT BLOCK DIAGRAM .......................3-79
5. CPU & CONTROL REGISTER &
MEMORY SLOT BLOCK DIAGRAM .....................3-80
6. VIDEO IN/OUT BLOCK DIAGRAM .......................3-81
7. DV1394 IN/OUT BLOCK DIAGRAM .....................3-82
8. MEMORY CARD IN/OUT BLOCK DIAGRAM .......3-83
CIRCUIT DIAGRAMS
1. BGA 308P CIRCUIT DIAGRAM.............................3-84
2. DDR & B TO B CONNECTOR
CIRCUIT DIAGRAM ..............................................3-86
3. POWER, FLASH, CONNECTOR CIRCUIT
DIAGRAM ..............................................................3-88
4. RST, CONTROL/STATUS_REG., ATAPI,
HOST_CPLD, LATCH CIRCUIT DIAGRAM ..........3-90
5. VIDEO/AUDIO CODEC, MSP
CIRCUIT DIAGRAM ..............................................3-92
6. DV1394, MEMORY, HDMI CIRCUIT DIAGRAM ...3-94
• WAVEFORMS .........................................................3-96
• CIRCUIT VOLTAGE CHART ...................................3-98
PRINTED CIRCUIT DIAGRAMS
1. VDR P.C.BOARD(TOP VIEW) .............................3-100
2. VDR P.C.BOARD(BOTTOM VIEW).....................3-102
3-1
................................................3-76
..............................................3-84
.......................3-100