Sharp VC-90ET

TROUBLESHOOTII'G IN RECORD MODE (SECAM CHROMA) FLOW CHART NO.22
Recording is black and white
(color E-E mode).
Is there signal at pin (@)
of (C5702?
YES
Is there 5V at pins @®
and of 1C5702?
Check the E-E line (pin G@)
of K502).
is there signal atpin (@) | NO
of IC5702?
Check the PC SV, AT
6.5V, PC SV and PB 5V
lines and the peripheral
circuit of Q5713 and
Q5714.
Check pin (5) of 1€5702
(Ov).
Is there signal at.pin @)
of 1€5702?
YES
Replace 1C5702.
Is there signal at pin G0)
of 1C57027
YES
Is there SYNC signal at
pin @® of 1C5702?
YES
Reptace (C5702.
Check the SECAM ID and SECAM(H) lines (pin (4) of K502).
Is there signal at pin (@) NO
of C5702?
Check the peripheral
circuit of Q5716.
Check the peripheral
circuit of Q508.
Is there signal at pin (1) NO
of 1CS702?
Check the composite
synctine.
Is the DC voltage at the
emitter of Q5706 about
3.4V?
YES
Is there signal at the Is there signal at pin (@)
emitter of Q57067 of (C5702? Replace 15702.
YES YES
Check R5814 and R5815
(adjust the SYNC gate).
Check R5813 (chroma
record level).
TROUBLESHOOTING
IN
PLAYBACK
MODE
(SECAM
CHROMA)
FLOW
CHART
NO.
23
Playback is black and white.
is there SV at pin @ of
1€301? Check the AL P8 SV line.
Is there signal at pin @2)
of 1C301?
YES
is there signal at pin @)
of 1C5702 (TPS02)?
YES
YES
Replacse 1C301.
is there signal at pin ()
of 1C5702?
YES
a pateees the line’
of XB, CE and pin 0
KS01.
Check the AL PB 5V, PC
7V and AT 6.5V lines.
Isthere SV atpins (@8)
and (s) of ICS702?
YES
Check pin G) of
1C5702 (OV).
Is there signal at pin (@)
of 1CS702?
YES
Check the peripheral
circuit of Q5716.
ted Replace 1€5702.
Is there signal at pin @)
of t€5702?
Yes
|s there signal at pin @®
of 1€57027
YES
's there SYNC signal at
pin @ of C5702?
YES
Replace IC5702.
Check the SECAM ID and SECAM (H) lines (pin @ of KS02).
Check the composite
syne signal.
Is the DC voltage at the
emitter of Q5705 about
3.4V?
YES
Is
there
signal
at
the
Is
there
signal
at
pin
NO
emitter
of
Q570S?
of
IC5702?
®
ie
cecaeciae
ves YES
Check
R5814
and
RS815
's
there
signal
at
pin
ue
{adjust
the
SYNC
gate).
@})
of
1€57027
YES
Is there signal at pin
of 1C5702?
Replace 1C5702.
1506-9A