SHARP VC-H63M
Manual de Servicio

NO.11 CAPSTAN TROUBLESHOOTING FLOW CHART NO.13 DRUM MOTOR TROUBLESHOOTING(2)

VC-H63M

capstan fails to run. The drum motor runs only for a few seconds.

NO the capstan error Is drum PG signal given out from IC801. Check drum motor.

pin(45) IC801. pin(3) of AD connector?

YES and all the way up thru to pin(13) of Check AT 5V line. Check line between AD connector Is the voltage of 5V DC applied at NO pin(8) of AE connector? IC801. Check line between AD connector Check line between the AE connector Is drum FG signal given out at NO sent in pin(4) of AE connector? pin(12) of IC801? of IC801. of IC801. Check pin(35) of IC801 and all the Is head switching pulse given out at NO NO way up thru to the current limitter line pin(38) of IC801? of R854~858. Is the voltage pin(3) of AE Check IC801. connector 1.25~2.5V? Check M 12V line. Replace capstan motor.

Is drum PG signal given out at pin(13) of IC801?

YES

Is the voltage more than 2.6V DC NO

and all the way up thru to pin(47) and all the way up thru to pin(12)

YES YES

YES

NO

Is the M 12V applied at pin(5) of Replace IC801. AE connector? YES

40
Is the drum motor rotating? NO
pin(44) of IC801? Check IC801.

FLOW CHART NO.12 DRUM MOTOR TROUBLESHOOTING(1) FLOW CHART NO.14 HEAD SWITCHING PULSE TROUBLESHOOTING

The drum motor fails to run. No head switching pulse.

Is the drum error signal given out of NO See FLOW CHART NO.12,13 DRUM MOTOR

YES TROUBLESHOOTING(1), (2)

YES pin(3) of IC801? NO
Check M 12V line. YES about 5Vp-p D-PG

Is the voltage more than about 1.3V Check line between R836 (Drum NO Is the PG signal and drum FG DC given out pin(7) of AD error filter) and all the way up to signal present on the pins(13) and connector? pin(7) of AD connector. (12) of IC801, respectively?

Are there drum PG M.M. signal at NO YES NO YES

Is the M 12V applied at pin(4) of AD NO D-FG Check C835 and readjust R875. connector? (HEAD SW. POINT control.)

Replace drum motor. Replace IC801.

about 5Vp-p Check line between AD plug and all the way up thru to IC801. NO Check drum motor and between AD to AO harness. Are the PG signal and drum FG YES signal present on pins(3) and (5) of AD connector?