Sharp VC-MH80 Service Manual page 56

L A C
FLOW CHART P Y B A K
Playback is possible but without colour.
YES
NO
NO
NO
FLOW CHART NO.24 PLAYBACK MODE (CHROMA) TROUBLESHOOTING (VC-MH80 ONLY)
Playback is possible but without colour.
(PAL mode is OK)
NO
Switch at SECAM position?
NO
Is there signal at pin (12) of
NO
of
Is base signal Q5304 biased?
Check peripheral parts of 95304
and 9592.
T
T R O U B L E S H O O ING
Replace IC301.
Check between pin (19) of iC3Ol
and all the way up thru to pin (53)
of ic201.
Check between pin (55) and all the
(Check C-CCD circuit)
Check peripheral circuits of X501
and X502.
Check between pin (19) and the
I
Replace IC201.
I
Check peripheral parts of AZ-ZA
Check 95301, E-E(L) line, IC 5301
and peripheral parts.
Check SECAM 5V line.
FLOW CHART NO.25 Hi-Fi TROUBLESHOOllNG (1)
No Hi-Fi E-E sound heard
I
Audio signal input from tuner.
Is audio signal
Check line betw-
inputted to pins (2)
een NICAM or IGR
and (35) IR- - Decoder circuit and
the Hi-Fi circuit.
YES
between the IF
unit' s Audio Out
and the Hi-Fi
circuit. [VC-MH80
Check IC6301 and IC701, and all
pins (18) and (16) of IC6301 ? the way thru between there.
Is the supply voltage of 5V fed
to pins (15), (21) and 9V fed to
pin (46) of IC6301 1
YES
Line coupling: Is audio signal outputted at pins (47) and (45) of IC6301 ?
RF coupling : Is audio signal outputted at pin (48) of IC6301 7
about
There is 1.4 V at pin (23).
Line coupling : Check line ranging from pins (47) and (45) of IC6301 tothe
audio output terminal.
RF coupling
terminal pin (2) of tuner (CNV6301). [VC-MH90 only]
I
YES
I
Check PC5V and
Replace IC6301.
NO