Read Sharp 37VT-26H Service Manual online
37VT-26H(GY)
56
YES
NO
NO
FLOWCHART NO. 1-13
VCR RECORDING MODE (LUMINANCE) TROUBLESHOOTING
No record.
Are there Y/C data and
clock signals (IIC bus
data and clock) at pins
(8) and (7) of IC2201
respectively when
recording starts ?
Check the PC5V line.
NO
Check data and clock
signals from pins (72)
and (71) of IC2001.
Is there a signal at pin
(29) of IC2201 ?
YES
Is there a signal at pin
(57) of IC2201 ?
Is there a signal at pin (26)
of IC3301 ?
YES
Are pins (36) and (35) of
IC3301 at 5V level ?
YES
Check the connector AH
and cylinder.
YES
Is there a signal at pins
(3) and (10) of IC3301?
Replace cylinder.
Is there 5V at pin (4),
(21), (48) and (63) of
IC2201 ?
YES
Check pins (27), (38) and
(36) of IC2201 and signal
line.
YES
Check pins (30), (31)
and peripheral circuit.
NO
Check the signal line all
the way up to pin (57) of
IC2201.
Check the signal line all
the way up to pin (57) of
IC2201.
NO
Check PC5V and the
BIAS CTL (H) line.
Replace IC3301.
NO
NO
YES
YES
NO
NO
FLOWCHART NO. 1-14
VCR RECORDING MODE (CHROMA) TROUBLESHOOTING
Record is in black and white (E-E colour mode).
Are there Y/C data and
clock signals at pins (8)
and (7) of IC2201
respectively when
recording starts ?
Check the PC5V line.
Check the signal at pin
(99) of IC2201.
(Frequency, 4.43MHz
(PAL/SECAM),
Frequency, 3.58MHz
(NTSC)).
NO
Check data and clock
signals from pins (72)
and (71) of IC2001.
Is there a signal at pin
(57) of IC2201 ?
Is there a (Chroma)
signal at pin (26) of
IC3301 ?
Check X5501, X5502 and
peripheral circuit.
Replace IC2201.
NO
Check the chroma
rotation pulse line.
Is there 5V at pin (4),
(21), (48) and (63) of
IC2201 ?
YES
Check parts around pins
(12), (43), (45) and (10)
of IC2201 and signal line.
Is there chroma rotation
pulse at pin (65) of
IC2201 ?
NORMAL
ABNORMAL
YES
YES
NO
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