U8 Malfunction - Vivax ACP-12CH35GEF Service Manual

" U8" is
displayed on
the unit .
Re-energize 1
minute after de-
erergization
The unit returns to normal .
Conclusion : U8 is displayed due to
Is " U8" still
No instant energization after de-
displayed?
energization while the capacitor
discharges slowly .
Yes
The zero-cross detection
circuit of the mainboard is
defined abnormal . Replace
the mainboard.
Malfunction is
eliminated .