38
TROUBLESHOOTING(VCR)
1. POWER CIRCUIT
✓
CAUTION
You must use insulated transformer during the first part test of POWER circuit.
Check IC802, D821, D823-807
No power
POWER cord is ok?
Check the voltage at C806+
Exchange POWER CORD
Check F801, L801, L802, D801,
R802.
Exchange rectifier diode of 2
nd
parts ; D821, D822, D824, D825,
D826, D827.
NO
YES
YES
YES
YES
NO
NO
NO
Check around the Main Board.
Is it over 4V at Q806(B)?
YES
NO
Is there switching pulse of
Q821(S), Q824(E), and IC805
pin#2?
Is there swiching signal at
pin #1(Drain) of IC802?
Check
rectifier diode of 2
nd
parts ;
D821, D822, D824, D825,
D826, D827
Check IC501 on/off control
NO
YES
Check Q821,Q822,Q824,IC805,IC808
Summary of Contents for DSI-9100
Page 5: ...4 SCHEMATIC DIAGRAM ...
Page 6: ...5 SCHEMATIC DIAGRAM ...
Page 7: ...6 SCHEMATIC DIAGRAM ...
Page 8: ...7 SCHEMATIC DIAGRAM ...
Page 9: ...8 SCHEMATIC DIAGRAM MPEG STI5518 ...
Page 10: ...9 SCHEMATIC DIAGRAM MPEG CIMAX ...
Page 11: ...10 SCHEMATIC DIAGRAM MPEG MEMORY 27M ...
Page 12: ...11 SCHEMATIC DIAGRAM MPEG VIDEO ...
Page 13: ...12 SCHEMATIC DIAGRAM MPEG AUDIO ...
Page 14: ...13 SCHEMATIC DIAGRAM MPEG POWER RS 232 VCR CON ...
Page 15: ...1 Block Diagram 14 CIRCUIT INFORMATION MPEG ...
Page 24: ...23 CIRCUIT INFORMATION MPEG EMI Interface Timing ...
Page 59: ...58 PCB CIRCUIT BOARD 1 MAIN PCB Circuit Board ...
Page 60: ...59 PCB CIRCUIT BOARD 2 MPEG PCB Circuit Board ...
Page 61: ...60 INSTRUMENT DISASSEMBLY 1 PACKING ASS Y ...
Page 62: ...61 INSTRUMENT DISASSEMBLY 2 FRONT PANEL ASSEMBLY 1 7H32D ...
Page 63: ...62 INSTRUMENT DISASSEMBLY 2 4J32D ...
Page 64: ...63 INSTRUMENT DISASSEMBLY 3 SET TOTAL DISASSEMBLY ...
Page 76: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...