Sharp VC-90ET - Page 53

TAKE-UP
REEL
PULSE
GENERATOR
TROUBLESHOOTING
No reel sensor pulse appears.
Insert the cassette, and
put the unit in FF or REW
mode.
FLOW CHART NO. 12
Is
there
the
reel
sensor
:
about
:
Check
peripheral
circuits
°
ai
ct
orf
®
ri
=
Eee
VANEP
connector
AM
?
of
Q804.
Is there the reel sensor
pulse at pin © of the
connector MF ?
Check the harness AM-
MF.
Replace the reel sensor
(located in the reel
sensor PWB, F2977GE).
HEAD SWITCHING PULSE TROUBLESHOOTING
No head switching pulse.
-
ONT
RSG
about
|
fotating?
1.8Vp-p
YES
ppc
eee
Are the drum PG drum YES
and drum FG signal
inputted to pins @ and
> of 1C701, respectively
about pg (at pin ®
Veo of AG plug) NO
Are the amplituded
drum PG and drum FG
signals outputted to pins
and of IC701,
répectively ?
YES
NO
Are the drum PG and
drum FG signals YES
outputted to pins © and
@ of the plug AG.
| NO
NS Check the harness AG-
ME and then replace the
drum motor unit.
about
D-FG (at pin @
35m Vp-p
of AG plug)
FLOW CHART NO. 13
See FLOW CHART NO. 9.
Replace IC701.
Replace (C701.
Check the drum PG and
drum FG signal lines
between the plug AG
and IC702?
<
?
©
je)
m
+