Troubleshooting - FUNAI BH2-M200 Service Manual

1 Power Supply Section
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged power
cord is plugged again after several seconds.
Is the EV+16V line voltage normal?
Check each rectifying circuit of secondary circuit and
service it if defective.
FLOW CHART NO.2
The fuse blows out.
Check the presence that the primary component is
leaking or shorted and service it if defective.
After servicing, replace the fuse.
FLOW CHART NO.3
When the output voltage fluctuates.
Does the secondary side photo coupler circuit operate
normally?
Check the circuit and service it if defective. (IC1001,
IC1100, D1001, D1003, D1004, D1005)
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of power circuit.
Check if there is short circuit on the rectifying diode and the circuit in each rectifying circuit of secondary side, and
service it if defective. (D1101, D1116, D1117, IC1101, IC1102, IC1104, IC1105, Q2604, Q2651)
FLOW CHART NO.5
EV+16V is not outputted.
Is approximatery +16V voltage supplied to the cathode
of D1101(D1116, D1117)?
Check for load circuit short-circuiting or leak, and
service it if defective.

TROUBLESHOOTING

Yes
Yes
Yes
Yes
Yes
No
See FLOW CHART No.2 <The fuse blows out.>
No
Check for lead or short-circuiting of primary circuit
component and service it if defective.
(IC1001, IC1100, Q1001, Q1002, T1001, D1006,
No
D1007, D1008, D1009, D1010, C1010, R1013)
Check the presence that the rectifying diode or circuit
is shorted in each rectifying circuit of secondary side
and service it if defective.
Check the circuit and service it if defective.
No
(IC1100, IC1113)
No
Check D1101, D1116, D1117, C1117 and their
periphery, and service it if defective.
1-12-1 E4V20TR