42
VC-A410U
VC-H810U
FLOW CHART NO.12
The drum motor fails to run.
Is the voltage more than about 2.6V
DC given out of pin(46) of IC701.
Check IC701.
NO
NO
NO
YES
YES
YES
Check between pin(46) of IC701
and all the way up to pin(2) of
IC706.
Is the voltage more than about 2.6V
applied at pin(2) of IC706?
NO
YES
Check PC 5V line.
Is the supply voltage of 5V feed to
pin(3) of IC706?
Is the supply voltage of 12V feed to
pin(21) of IC706?
Check or replace drum motor.
Check AT 12V line.
NO
YES
YES
YES
YES
NO
NO
NO
FLOW CHART NO.14
No head switching pulse.
See
FLOW CHART NO.13,14
.
Is the drum motor rotating?
Is the drum PG signal and drum FG
signal present on pins(66) and (65)
of IC701, respectively?
Are there drum PG M.M.signal at
pin(81) of IC701?
Check C723 and readjust R701.
(HEAD SW. POINT control.)
Could be lines between IC706
and IC701.
Check peripheral circuit of IC706.
Are the drum PG and drum FG
signals present on pins(7) and (8) of
IC706?
Replace IC701.
Check or replace drum motor.
Check line between pin(7) of IC706
and all the way up thru to
pin(66) of IC701.
Is drum PG signal given out of
pin(66) of IC701?
Is V-H.SW.P pulse given out of
pin(23) of IC701?
Check IC701.
Replace IC701.
YES
YES
YES
FLOW CHART NO.13
The drum motor runs only for a few seconds.
Is drum PG signal given out of
pin(7) of IC706?
Check pin(4), (5), (6) of IC706 and
periperal circuits.
Replace IC706.
YES
NO
NO
NO
NO
