42
VC-A422U
VC-H822U
FLOW CHART NO.12
The drum motor fails to run.
Is the voltage more than 2.6V
DC given out of pin(30) of IC701.
Check IC701.
NO
NO
NO
YES
YES
YES
Check between pin(30) of IC701
and all the way up to pin(2) of
IC706.
Is the voltage more than 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(87) of IC701?
Check C753 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
Summary of Contents for VC-A422U
Page 51: ...VC A422U VC H822U VC A422U VC H822U 52 53 SIGNAL FLOW BLOCK DIAGRAM VC A422U ...
Page 52: ...VC A422U VC H822U VC A422U VC H822U 54 55 SIGNAL FLOW BLOCK DIAGRAM VC H822U ...
Page 53: ...56 VC A422U VC H822U POWER CIRCUIT BLOCK DIAGRAM ...
Page 63: ...72 VC A422U VC H822U M E M O ...
Page 76: ...85 VC A422U VC H822U M E M O ...