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Main PCB Trouble Diagnosis
Is 5th pin from the top of PC102 output normal?
1. Check AC connection
2. Check Power S/W ON
3. Check other PCBs
1. Replace the CONNCETOR.
2. Replace Key PCB.
Check the connection of KEY
PCB toMAIN PCB
Check MAIN PCB
Check start
N
N
N
Y
Y
Does LED turn on (green light)?
Y
Y
Does LED next to Power S/W
turn on (red light)?
6. When Key does not operate
Summary of Contents for DPN-4274NHS
Page 15: ...14 3 BLOCK DIAGRAM...
Page 16: ...15 4 Description of A V MAIN and SUB PCB and POWER 4 1 Block Diagram of main IC and TP...
Page 43: ...42 Main PCB Trouble Diagnosis If above signal do not appear replace MAIN PCB...
Page 55: ...54 11 STRUCTURE OF PDP SET...
Page 58: ...57 COMPONENTS PICTURE REMARK 1h Digital PKG 2 MAIN BOARD 3 SUB BOARD 4 POWER BOARD...
Page 59: ...58 STRUCTURE OF PDP SET COMPONENTS PICTURE REMARK 5 FRONT MASK 6 FILTER GLASS 7 BACK COVER...
Page 60: ...59...
Page 61: ......
