37VT-26H(GY)
58
VCR SOUND TROUBLESHOOTING
No Sound.
No record.
YES
NO
Is there 0.7V voltage level
at pin (70) of IC2201 ?
Check BIAS CTL (H)
line.
NO
Is there a signal at pin
(81) of IC2201 ?
Are there the IIC bus data
and clock signal at pins (8)
and (7) of IC2201 ?
YES
YES
Replace IC2201.
Check the IIC bus data
and clock signal line.
NO
NO
Is there supply voltage of
9V feed to at pin (2) of
T6601 ?
Check PC 9V line.
YES
YES
NO
Is there a Bias Oscillator
signal at pin (6) of
T6601 ?
Check T6601, Q6603,
Q6604 and their
peripheral parts.
YES
NO
YES
Is there a signal
(Bias+Audio sig.) at pin
(4) of connector AA.
Check FFC MH-AA and
A/C head.
No E-E signal.
NO
Is there an Audio
signal at pin (87) of
IC2201 ?
Check parts around the
audio inputs jack, and
circuits around the audio
output circuit in TV tuner.
No playback.
NO
NO
YES
YES
NO
Is there supply
voltage of 5V feed to
pin (84) of IC2201 ?
Check the PC 5V line.
NO
NO
Are there the IIC bus
date and clock
signal at pins (8) and
(7) of IC2201 ?
Check between pins (8) and
(7) of IC2201 and all the
way thru to pins (72) and
(51) of IC2001.
Is voltage of pins (86) and
(88) of IC2201 normal ?
Is there a signal at
pin (85) of IC2201 ?
Check signal line
between pin (85) of
IC2201 and TP6601.
Is there "L" level at pin (72)
of IC2201.
Check A-MUTE
(H) line.
YES
YES
Replace
IC2201.
YES
Is there an Audio signal at
pin (74) of IC2201 ?
NO
Is there "L" level at pin (72)
of IC2201 ?
NO
Is there a signal at pin (85)
of IC2201 ?
Is there "L" level at
pin (70) of IC2201 ?
YES
YES
YES
Check line between pin (85) of IC2201 and the audio
speaker output.
YES
YES
Are the FFC MH-AA
and the PB AMP's
peripheral parts
normal ?
NO GOOD
Clean A/C head.
Are azimuth and
height of the A/C
head properly
adjusted ?
Check AUDIO
MUTE (H) line.
Replace IC2201.
Check BIAS CTL (H)
line.
NO
Replace defective
parts.
NO
Readjust azimuth
and height.
YES
Replace A/C head.
FLOWCHART NO. 1-17
NO
Check the signal line all
the way up to pin (81) of
IC2201 and pin (6) of
T6601.
