Sharp VC-M29GM Serviceanleitung Seite 19

FLOWCHARTNO.15HEADSWITCHING PULSETROUBLESHOOTING.
Is the drum motor rotating?
Is the drum PG signal and drum FG
signalpresentonpins (65)and (66)
of iC701, respectively?
YES
DeFG
About 5Vp-p
D-PG
About 5Vp-p
Are the drum PG and drum FG
signalspresenton pins (5) and (3)
of AD connector?
NO
Check between drum motor and ail
the way up thru to AD-ME harness.
No head switching pulse.
see FLOW CHART
NO
(DRUM MOTOR
TROUBLESHOOTING
NO
Check lines between AD plug
YES
and
NO.13,14.
(2))
Replace IC701.
IC701.
FLOW CHART NO.16 DR
Drum servo
Is there 10.0MHz oscillation at pins
(34) and (33) of IC701 ?
YES
In PB mode
Is the drum FG signal at pin (66)
of IC701 present?
YES NO
Is the head switching pulse at pin
(21) of 10701 present?
YES
Is the drum APC output at pin (25) of
10701 and the drum AFC output at
pin (26)of IC701present?
YES
Is the drum control voltage applied
to pin (I) of ME connector?
YES
Replace IC 705
Replace drum motor.
NO
NO
NO
NO