Sharp VC-MH80 Service Manual page 52

FLOW CHART NO.10 LOADING MOTOR AND EJECTTROUBLESHOOTING
NO
when the EJECT button is pressed?
Does the take-up reel disk turn
NO
when the capstan motor is
running?
Are pulses applied at pin (85) of
turning?
YES
Isa "H" (about 1.7V) Level applied
at pin (6) of IC704 when a reel
pulse has been inputted?
the loading motor terminal?
NO
Dose the loading motor run?
I
YES
Replace cassette cam, gear, etc.
See FLOW CHART NO. 12.
B
C A P S T A N T R O U L E
SHOOTING)
Check reel disk and reel drive unit.
Check take-up reel sensor and all
the way up thru to IC701.
Check line between pin (95) of
pin (6) of IC704.
Check IC704.
Check between IC704 and all the
way up thru to the loadinq motor.
Replace loading motor.
I
FLOW CHART NO.1 1 SYSTEM CONTROL TROUBLESHOOTING
No power is turned on.
Are FIP data pulses, FIP clock pulses and FIP control ready pulses applied to pins (24), (23) and
(22) of IC5001, respectively?
YES
pin (37) of IC701 change from "L"
to "H" level?
Do the bases of Q9908,Q9909, and
about 8.3V?
NO
09908.09909 and 09915
Q9902, Q9903 and Q9904t
I
1
Check peripheral circuits for poor
solderino.
I
Check RX001 and IC701, and all
the way thru between them.
Check IC701.
Check QSSOS, 49909, Q9915 and
all the way up thru to IC701.
Check Q9908,49909, Q9915 and
the ATl2V line.
Check Q9902,49903, Q9904 and
the AT5.5V line.
I
I
I