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ELECTRICAL TROUBLESHOOTING GUIDE
1. Power Circuit(SMPS)
(1) No 5.3VA.
No 5.3VA.
Is the F101 normal?
Is the BD101 normal?
Is the R101 normal?
Does the oscillation waveform appear at
the IC101 Pin 7?
Is there DC voltage at the IC101 Pin 4?
Is there about 2.5V at the IC103 Vref ?
Is the D106 normal?
Check the Main PCB 5.3VA Line short?
YES
YES
YES
YES
YES
YES
YES
YES
NO
Replace the F101
(Use the same Fuse).
NO
Replace the BD101.
NO
Replace the R101.
NO
Is Vcc(about 13~15V) permittable at the
IC101 Pin 3?
Check or Replace the D103.
NO
Replace the IC102.
NO
Replace the IC103.
NO
Replace the D106.
3-4
NO
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