Aiwa HV-FX7800 Service Manual page 56

ELECTRICAL TROUBLESHOOTING -4/17
7. Power Circuit(SMPS)
(4) No 5VT(5V)
No 5VT(5V)(5VG).
Is 5.3VA put into the Q152(Q151)
collector?
Is the Q163(Q162) Base "H"?
Is about 4.7V put into the
Q152(Q151) Base?
Check or Replace the Q152(Q151).
7. Power Circuit(SMPS)
(Hi-Fi Only)
No Display(FLD)
YES
Is the -19.9, -23.5VG
normal?
YES
Check D108 and FR01.
YES
YES
YES
YES
NO
Is there voltage at the
D107.
Is the Q156 Base "L"?
Is about 5V put into the
Q156 collector?
Check and replace Q153
and ZD104.
NO
Check whether 5.3VA is out of other.
NO
Check the µ-com Control.
NO
Check the Q163(Q162)
whether it works normally.
YES
YES
YES
-56-
NO
Check F 102/D107.
NO
Check the µ-com control.
NO
Replace Q156.