41
VC-A412U/A413U
VC-H812U/H813U
FLOW CHART NO.10
The cassette tape fails to eject.
Does the capstan motor start when
the EJECT button is pressed?
See
FLOW CHART NO.12.
Does the take-up reel disk turn when
the capstan motor is running?
Check reel disk and reel drive unit.
Are pulses applied at pin(2) of IC701
when the take-up reel disk is turning?
Check take-up reel sensor and all the
way up thru to IC701.
Is a "H"(about 1.7V) level applied at
pin(12) of IC706 when a reel pules
has been inputted?
Check pin(90) of IC701.
Is the voltage about 10V sent out of
pin(15) of IC706?
Check IC706.
Is the specified voltage applied at the
loading motor terminal?
Check between IC706 and all the
way up thru to the loading motor.
Dose the loading motor run?
Replace loading motor.
Replace cassette cam, gear, etc.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
NO
NO
NO
FLOW CHART NO.11
No power is turned on.
Does power control(H) signal at
pin(4) of IC701 change from "L" to
"H" level?
Check IC701.
Does the base of Q951 change from
about 5.0V to 4.5V?
Check IC701 and all the way up thru
to Q951.
Is 5V sent out of the collector of
Q951?
Check Q951 and the AT 5V line.
Check peripheral circuits for poor
soldering.
FLOW CHART NO.12
The capstan motor fails to run.
Is the voltage more than about 2.6V
DC given out of pin(29) of IC701.
Check IC701.
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
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 AC connector
and all the way up thru to pin(29)
of IC701.
Is the voltage at pin(3) of AC
connector 1.6~2.7V?
Check between the pin(92) of IC701
and all the way up thru to pin(3) of
AC connector.
Is the supply voltage of 12V feed to
pin(5) of AC connector?
Check AT 12V line and motor voltage
selector circuit.
Replace capstan motor.
Содержание VC-A412U
Страница 6: ...6 VC A412U A413U VC H812U H813U 1 3 LOCATION OF MAJOR COMPONENTS AND CONTROL ...
Страница 50: ...VC A412U A413U VC H812U H813U VC A412U A413U VC H812U H813U 50 51 8 BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM ...
Страница 53: ...56 VC A412U A413U VC H812U H813U POWER CIRCUIT BLOCK DIAGRAM ...
Страница 63: ...72 VC A412U A413U VC H812U H813U M E M O ...