VC-A598U/H995U/H996U
-H997U/H9977U/H998U
42
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.
Does 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. (Q955~Q956).
Replace capstan motor.
Summary of Contents for VC-A598U
Page 6: ...VC A598U H995U H996U H997U H9977U H998U 6 1 3 LOCATION OF MAJOR COMPONENTS AND CONTROL ...
Page 51: ...VC A598U H995U H996U H997U H9977U H998U 51 8 BLOCK DIAGRAM POWER CIRCUIT BLOCK DIAGRAM ...
Page 52: ...VC A598U H995U H996U H997U H9977U H998U 52 SYSTEM SERVO BLOCK DIAGRAM ...
Page 53: ...VC A598U H995U H996U H997U H9977U H998U 53 ...
Page 54: ...VC A598U H995U H996U H997U H9977U H998U 54 SIGNAL FLOW BLOCK DIAGRAM VC A598U ...
Page 61: ...VC A598U H995U H996U H997U H9977U H998U 61 13 12 11 10 9 8 7 ...
Page 65: ...VC A598U H995U H996U H997U H9977U H998U 65 13 12 11 10 9 8 7 ...
Page 67: ...VC A598U H995U H996U H997U H9977U H998U 67 13 12 11 10 9 8 7 ...
Page 69: ...VC A598U H995U H996U H997U H9977U H998U 69 13 12 11 10 9 8 7 ...
Page 72: ...VC A598U H995U H996U H997U H9977U H998U 72 7 6 5 4 3 2 1 A B C D E F G H MAIN PWB ...
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