Samsung SF6500 Service Manual page 91

Maintenance & Troubleshooting
7-4-2 Malfunction of LCD Display
START
1. Unplug machine
2. Check fuse
Measure voltage on
the scan b'd (CN7-1)
Y
+5 V ?
N
Check harness
7-6
Y
Power cord
connected?
N
Connect as
required
Y
Fuse OK ?
N
Y
1. Replace fuse
2. Plug in machine
Y
+5 V ?
N
Check harness
Replace OPE b'd
and LCD module
Y
N
Normal?
Check AC voltage
END
Y
Fuse remain
good ?
N
Replace power
supply
Measure on the
OPE b'd (CN1-1)
Y
OK ?
N
Replace harness
END
Replace harness
Y
220 VAC?
N
Notify customer
Y
Check power
supply voltage
N
A
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