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tg
of 1C702 ?
Check pin @ of the
harness ME and the
drum motor.
ts there the amplituded
drum FG signal at pin ©
Check the signal line.
DRUM
SERVO TROUBLESHOOTING
Drum servo does not function.
\s there the clock input at pin
@ of 1€701? (4.43 MHz in
PAL/MESECAM/SECAM
mode,
3.58 MHzin NTSC mode; Jevel
at about 0.3 Vp-p)
Check the main PWB
and the line between
the main PWB and pin
@ of 1¢701.
In REC mode
In PB mode
Is there the reference
signal compestie sync)
at pin Gq of 1C701?
Is there the durm FG
signal at pin © of
1€701?
Isthere the head
Check the Composite
switching pulse atpin
See FLOW CHART NO.13.
sync signal generator in
@ of 1801 ?
Y/C circuit.
YES
Is there the drum APC
output at pin Q) of
1€701 and the drum
AFC output at pin
of IC701 ?
Replace '€701.
Is there the drum
control voltage applied
1° pin © of the harness
is pin G of 1801 in high
impedance ?
Replace the drum motor.
Replace IC801.
FLOW CHART NO. 10
<
2
©
2)
m
+
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