3-6
ELECTRICAL TROUBLESHOOTING GUIDE
2. UNIT POWER CHECK FLOW
3. UNIT CANNOT POWER ON
TEST
When press power keys
or use remote cannot power on.
Power check end.
Replace main board.
Whether power board
12 V output is normal?
Whether unit power check
is OK?
Repair or replace power board.
Repair or replace
power board and main board.
YES
YES
YES
YES
NO
NO
Make sure the main board
don’t short.
Whether connect to PC
with RS232 cable and update the
firmware is OK?
Whether main board
3.3V_STBY/ 3.3 V/ 1.5 V/ 1.2 V
output is normal?
Whether main board
5 V output is normal?
Repair or replace main board.
Replace U8.
Replace U4.
Replace U5.
YES
YES
YES
YES
NO
NO
NO
NO
Summary of Contents for BP340
Page 9: ...1 8 MEMO ...
Page 15: ...2 6 MEMO ...
Page 26: ...3 11 BLOCK DIAGRAM ...
Page 27: ...3 12 MEMO ...
Page 41: ...3 39 3 40 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...
Page 42: ...3 42 3 41 2 SMPS P C BOARD TOP VIEW BOTTOM VIEW ...
Page 43: ...3 44 3 43 MEMO MEMO ...
