AIWA HVFX7800
Instrukcja Serwisowa

ELECTRICAL TROUBLESHOOTING -1/17 1. Power Circuit(SMPS) (1) No 5.3VA.

No 5.3VA. YES Is the F101 normal? YES Is the BD101 normal? YES Is the R101 normal? YES Does the oscillation waveform appear at the IC101 Pin 1? YES NO Is Vcc(about 15~19V) permittable at the IC101 Pin 4? NO Check or Replace the D103. NO Replace the R101. NO Replace the BD101. NO Replace the F101 (Use the same Fuse).

Is there DC voltage at the IC101 Pin 4? YES Is there about 2.5V at the IC103 Vref ? YES Is the D106 normal? YES Check the MAIN C.B 5.3VA/5.0V Line short?

NO

Replace the IC102.

NO

Replace the IC103.

NO

Replace the D106.

-54-