Read Sharp DV-NC55 (serv.man10) Service Manual online
48
DV-NC55S/H
DV-NC60H
DV-NC60H
FLOW CHART NO.8
Is the voltage more than about 2.6V DC given out
of pin(59) of IC701.
Check IC701.
Is the supply voltage of 5V feed to pin(8) of AC
connector?
Check PC 5V line.
Is the voltage more than 2.6V DC sent in pin(4) of
AC connector?
Check between the pin(4) of AC connector and all
the way up thru to pin(59) of IC701.
Replace capstan motor.
NO
NO
NO
YES
YES
YES
Is approx. 3.5V applied to the pin(3) of the AC
connector?
Check the pin(60) of IC701.
NO
YES
Is 23V applied to the pin(5) of the AC connector
normally?
Check AT 23V line.
NO
YES
The capstan motor fails to run.
FLOW CHART NO.7
Does power control(H) signal at pin(94) of IC701
change from "L" to "H" level?
Check IC701.
Does the base voltage of RJ9904 change from
about 12.6V to 11.8V?
Check line between RJ9904, Q9905 and IC701.
Is voltage of 12V sent out from the emitter of
RJ9904 transistor?
Check peripheral circuit of RJ9904 and AT 12V line.
NO
NO
NO
YES
YES
Does the base voltage of Q9903 change from
about 5.5V to 6.2V?
Check line between emitter of RJ9904 and base of
Q9903.
NO
YES
Is voltage of 5V sent out from the emitter of Q9903
transistor?
Check peripheral circuit of Q9903 and AT 5V line.
NO
YES
Check peripheral circuit for poor soldering.
YES
No power is turned on.
FLOW CHART NO.9
Is the voltage more than about 2.6V DC given out
of pin(58) of IC701.
Check IC1701.
Is the supply voltage of 5V feed to pin(3) of IC7002?
Check PC 5V line.
Is the voltage more than about 2.6V applied at
pin(2) of IC7002?
Check between pin(58) of IC701 and all the way
up to pin(2) of IC7002.
NO
NO
NO
YES
YES
Is the supply voltage of 12V feed to pin(21) of IC7002?
Check PC 12V line.
NO
YES
Check or replace drum motor.
YES
The drum motor fails to run.
FLOW CHART NO.10
Is drum PG signal given out of pin(7) of IC7002?
Check pins(4), (5), (6) of IC7002 and periperal circuits.
Check or replace drum motor.
Is drum PG signal given out of pin(66) of IC701?
Check line between pin(7) of IC7002 and all the
way up thru to pin(66) of IC701.
Is V-H.SW.P pulse given out of pin(23) of IC701?
Check IC701.
NO
NO
NO
YES
YES
YES
Replace IC701.
YES
The drum motor runs only for a few seconds.
FLOW CHART NO.11
Is the drum motor rotating?
See FLOW CHART NO.9, 10
<The drum motor fails to run>
<The drum motor runs only for a few seconds>
Is the drum PG signal and drum FG signal present
on pins(66) and (65) of IC701, respectively?
Replace IC701.
Are the drum PG and drum FG signals present on
pins(7) and (8) of IC7002?
Check line between pins(7), (8) of IC7002 and all
the way up thru to pins(65), (66) of IC701.
Check periperal circuit of IC7002.
NO
NO
NO
YES
YES
YES
No head switching pulse.
D-FG
About 5Vp-p
D-PG
About 5Vp-p
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