3-1
SECTION 3
ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2
1. NO POWER PROBLEM ......................................................................................................................... 3-2
2. SPEAKER NO AUDIO OUTPUT ............................................................................................................ 3-3
3. USB NO DETECT ................................................................................................................................... 3-4
ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................... 3-5
1. SMPS POWER CIRCUIT ........................................................................................................................ 3-5
2. KEY PART .............................................................................................................................................. 3-7
3. POWER AMP PART ............................................................................................................................... 3-8
4. PORTABLE FUNCTION ......................................................................................................................... 3-9
5. OPTICAL FUNCTION ........................................................................................................................... 3-10
6. USB PART ............................................................................................................................................ 3-11
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-12
1. CRYSTAL .............................................................................................................................................. 3-12
2. AMP IC .................................................................................................................................................. 3-13
3. RESET IC .............................................................................................................................................. 3-14
4. AMP FAULT .......................................................................................................................................... 3-15
WIRING DIAGRAM .......................................................................................................................................... 3-17
BLOCK DIAGRAM .......................................................................................................................................... 3-19
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-21
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-23
1. SMPS P. C. BOARD DIAGRAM ........................................................................................................... 3-23
2. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-25
3. KEY P. C. BOARD DIAGRAM .............................................................................................................. 3-27
4. LED P. C. BOARD DIAGRAM .............................................................................................................. 3-28
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