Sharp VC-90ET

PLAYBACK
MODE
PAL.
NTSC.
MESECAM
(CHROMA)
TROUBLESHOOTING
FLOW
CHART
NO.
16
Playback isin black and white.
ts there a signal at pin NO
@ of 1C301?
YES
Replace iC301.
Check the harness from
IXBJ tofCeE J
YES YES
Check peripheral circuit
of Q514 and LPF (FL502)
Is there a signal at pin NO
Gof IC501 ?
Check the EE 5V line
(D502 “H").
Is there a signal at pin NO
@ of 1€501?
YES
Check the DC level at pin | NO
of IC501?
B seeee 4.6V)
:
uw t=]
Is there a signal at pin NO
@ of 1501 ?
Is there a signal at pin
@ of DL501, O of
DLS02 and @ of DL503. ©
Check Q515~Q524,
FL503
YES
Is there a signal at base
Check peripheral circuit
of Q516, 521, 524.
of Q525, 526 and Q527.
Change DLS0}1, OL502,
NO Is there a signal at pin NO
@of e501?
Is there a signal at pin
@)of 1€501 ?
YES
Or the DC level at pin | NO
of 1C501 ? :
Check the composite
Is there a signal at pin K
sync line.
@ of Icso1?
Check Q508 emitter
(Frequency
NO Check the CHROMA
ROTARY line.
(Colour -+-- H, B&W: L)
YES
4.433619MHz PAL
3.579545MHz NTSC
Replace !C501.
Isthere achromasignal {NO
atpin (@ of 1C201?
YES
Check peripheral circuit
of Q504.
Is there a chroma signal | NO
at pin@® of !€201? Replace 1201.
RECORDING
MODE
(LUMINANCE)TROUBLESHOOTING
FiGw
ciART
Nocad
No record.
Does
anormal!
picture
Is
there
5V
at
pin
@
of
Check
Q205
and
the
appearin
E-E
mode
?
1€201?
PCOV
and
ATE6.5V
line.
YES
YES
Is
there
a
signal
at
pin
Check
R218
(E-E
level
@
of C201?
)
YES
. 4 NO
Gui
atpin
Change
FL201
(LPF).
Check R223 (W. clip
AD).).
Is there a signal at pin
@) of 1€201 ? (TP201)
YES
Is there a signal at pin
@of C201?
YES
Is there a signal at pin
QD of 1€301?
YES
Check R227 (FM carrier
ADJ. ), R228 (DEV ADJ.)
andpin @) of IC201.
Check R321 (REC Y LEV
ADI.)
- Arepins @) and
of 1C301 at OV level and
OV level ?
YES
YES
Check the PB 5V and
BIAS 9V lines
<
0
fe)
Oo
m
+