LG MCV1306 Service Manual page 28

TRAINING MASTER
1. NO SOUND FROM SPEAKERS ............................................................................................................ 3-2
2. NO SOUND IN AUX FUNCTION ............................................................................................................ 3-3
3. NO SOUND IN PORT. IN FUNCTION ................................................................................................... 3-4
4. NO SOUND IN IPOD FUNCTION .......................................................................................................... 3-5
5. NO SOUND IN AM/FM FUNCTION ....................................................................................................... 3-6
6. NO SOUND IN CD FUNCTION .............................................................................................................. 3-7
7. NO SOUND IN USB FUNCTION ............................................................................................................ 3-9
8. NO POWER .......................................................................................................................................... 3-10
ONE POINT REPAIR GUIDE
1. NO POWER .......................................................................................................................................... 3-11
2. NO BOOTING WHEN POWER ON THE SET ..................................................................................... 3-13
3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ................................................................... 3-14
4. NO OPERATION OF MD ..................................................................................................................... 3-15
5. NO SOUND .......................................................................................................................................... 3-21
ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD ................................................................................................. 3-29
2. SYSTEM PART .................................................................................................................................... 3-33
3. NO AUDIO PART ................................................................................................................................. 3-34
4. DIGITAL AUDIO AMP CHECK ............................................................................................................. 3-39
WAVEFORMS
............................................................................................................................................. 3-40
WIRING DIAGRAM
................................................................................................................................... 3-43
BLOCK DIAGRAMS
1. OVERALL BLOCK DIAGRAM .............................................................................................................. 3-45
2. SMPS BLOCK DIAGRAM..................................................................................................................... 3-47
3. POWER BLOCK DIAGRAM ................................................................................................................. 3-49
CIRCUIT DIAGRAMS
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-51
2. MICOM CIRCUIT DIAGRAM ................................................................................................................ 3-53
3. PWM CIRCUIT DIAGRAM .................................................................................................................... 3-55
4. AMP CIRCUIT DIAGRAM ..................................................................................................................... 3-57
5. DSP CIRCUIT DIAGRAM ..................................................................................................................... 3-59
6. RF SERVO CIRCUIT DIAGRAM .......................................................................................................... 3-61
7. ADC CIRCUIT DIAGRAM ..................................................................................................................... 3-63
8. BEAT BOX CIRCUIT DIAGRAM .......................................................................................................... 3-65
9. VFD CIRCUIT DIAGRAM ..................................................................................................................... 3-67
10. VOLUME CIRCUIT DIAGRAM ............................................................................................................. 3-69
11. USB CIRCUIT DIAGRAM ..................................................................................................................... 3-71
12. IPOD CIRCUIT DIAGRAM .................................................................................................................... 3-73
13. MIC CIRCUIT DIAGRAM (OPTIONAL PART) ..................................................................................... 3-75
CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT BOARD DIAGRAMS
1. MAIN P.C.BOARD ................................................................................................................................ 3-81
2. SMPS P.C.BOARD ............................................................................................................................... 3-85
3. VFD P.C.BOARD .................................................................................................................................. 3-87
4. VOLUME P.C.BOARD .......................................................................................................................... 3-89
5. USB P.C.BOARD .................................................................................................................................. 3-91
6. IPOD P.C.BOARD ................................................................................................................................ 3-91
7. MIC P.C.BOARD (OPTIONAL PART) .................................................................................................. 3-91
SECTION 3 ELECTRICAL
CONTENTS
................................................................................................................................... 3-2
................................................................................................................. 3-11
................................................................................................................................. 3-45
............................................................................................................................... 3-51
................................................................................................................. 3-77
.................................................................................. 3-29
......................................................................................... 3-81
3-1