Sharp DV-RW250H (serv.man2) Service Manual ▷ View online
TROUBLESHOOTING GUIDE
E-19
YES
YES
NO
NO
CAPSTAN DD MOTOR NOT
ROTATING
Check POWER BLOCK.
Change IC3001.
In playback, is there voltage
at pin 78 of IC3001 2.5V ?
DD MOTOR rotate now?
If not, replace it.
In playback, is there voltage
at pin 2 of CP3001 12V ?
TROUBLESHOOTING GUIDE
E-20
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
THE AUDIO CAN NOT
RECORD
Is bias level at L102 OK?
In starting recording,
is there sine wave at
pin 98 of IC101?
Check POWER BLOCK and
voltage of base of Q103.
Check disconnection
and short of L102.
Is there audio signal at
pin 1 of IC101?
Is there voltage
of base of Q103
about 5V?
Check IC701 and
the circuit from TUNER
or audio input jack to IC701 .
Change Q103.
Change L101.
Is there a sine wave
at pin 6 of L101?
Check lead wire of A/C HEAD
and CONNECTOR.
TROUBLESHOOTING GUIDE
E-21
YES
YES
NO
NO
THE CASSETTE INSERT, BUT
THE TAPE DOES NOT MOVE
Does the mode
appear at display?
Does operate with
remote control?
Check operation PCB.
Check LOADING MOTOR
and MODE SENSOR
RELATION DEPARTMENT.
Check IC3001.
TROUBLESHOOTING GUIDE
E-22
YES
YES
YES
YES
NO
NO
NO
NO
RECORDING MECHANISM WORKS,
BUT NO VIDEO RECORD FROM
INPUT JACK OR TUNER
Is there video signal at
pin 15, 21 of IC 101 ?
Is the BASE of
Q103 5V ?
Is the voltage at pin 96
of IC3001 5V ?
Check circuit of video signal from
VIDEO IN or
TUNER to IC101.
Change IC3001.
Change IC101.
Is there video signal
at pin 26 of IC101 ?
Check CYLINDER UNIT and
circuit around of CP101.
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