LG XA14, Руководство по обслуживанию

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SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE
.................................................................................... 3-2
1. SMPS PART ........................................................................................................................................... 3-2
2. MUTING CIRCUIT (MUTE) .................................................................................................................... 3-3
3. AUDIO ABNORMAL ............................................................................................................................... 3-4
4. AUDIO FUNCTION MODE ..................................................................................................................... 3-5
5. IC301 TROUBLESHOOTING ................................................................................................................. 3-6
6. IC600 TROUBLESHOOTING ................................................................................................................. 3-7
7. IC601 TROUBLESHOOTING ................................................................................................................. 3-8
8. IC603 TROUBLESHOOTING ................................................................................................................. 3-8
9. U503 TROUBLESHOOTING .................................................................................................................. 3-9
10. TU501 FM TUNER MODULE ................................................................................................................. 3-9
11. CD PART .............................................................................................................................................. 3-10
12. CD READING CHECK ......................................................................................................................... 3-11
13. USB PART ............................................................................................................................................ 3-12
WAVEFORMS
............................................................................................................................................ 3-13
1. CD SEARCHING WAVEFORM ............................................................................................................ 3-13
2. SPINDLE DRIVE & MOTOR WAVEFORM .......................................................................................... 3-13
3. CD PLAYING WAVEFORM .................................................................................................................. 3-14
4. CD STOP ACTION WAVEFORM ......................................................................................................... 3-15
5. CD READING WAVEFORM ................................................................................................................. 3-15
6. CD PLAYING RF WAVEFORM ............................................................................................................ 3-16
7. USB OPERATING WAVEFORM .......................................................................................................... 3-17
8. RADIO OPERATING WAVEFORM ...................................................................................................... 3-17
WIRING DIAGRAM
................................................................................................................................... 3-19
BLOCK DIAGRAMS
................................................................................................................................. 3-21
1. MAIN BLOCK DIAGRAM ...................................................................................................................... 3-21
2. CD BLOCK DIAGRAM ......................................................................................................................... 3-23
CIRCUIT DIAGRAMS
............................................................................................................................... 3-25
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-25
2. MAIN CIRCUIT DIAGRAM ................................................................................................................... 3-27
3. MCU CIRCUIT DIAGRAM .................................................................................................................... 3-29
4. MAIN CD CIRCUIT DIAGRAM ............................................................................................................. 3-31
5. FRONT & USB CIRCUIT DIAGRAM .................................................................................................... 3-33
CIRCUIT VOLTAGE CHART
................................................................................................................. 3-35
PRINTED CIRCUIT BOARD DIAGRAMS
......................................................................................... 3-37
1. MAIN P.C.BOARD................................................................................................................................ 3-37
2. SMPS P.C.BOARD .............................................................................................................................. 3-39
3. FRONT P.C.BOARD ............................................................................................................................ 3-41
4. MCU P.C.BOARD ................................................................................................................................ 3-43
5. AUX P.C.BOARD ................................................................................................................................. 3-43
3-1