NO
YES
NO
FLOWCHART NO. 1-4 FLOWCHART NO. 1-5
LOADING MOTOR AND EJECT TROUBLESHOOTING
A cassette tape fails to eject.
Does the capstan motor start when
the EJECT button is pressed ?
Check peripheral circuit for poor
soldering and wire harness to
mechanism or the sensor input to
IC7701 from mechanism.
Check the reel disk and reel drive unit.
See FLOWCART NO. 1-6
NO
Is about 11V at pin (10) of IC7702 ?
Check IC7702 and "L" level of pin (5)
of it.
Check IC7701.
Check Q781 and IC780(PC9V GEN.).
SYSTEM CONTROL TROUBLESHOOTING
No power.
Does the take-up reel disk turn when
the capstan motor is running ?
YES
NO
Check IC1001 and IC7701.
NO
NO
NO
NO
Check the take up reel sensor and all
the way to IC7701.
YES
NO
Check between pin (6) of IC7702 and
all the way up to pin (11) of IC7702.
Is reel pluse at pin (80) of IC7701
when the take-up reel disk is turning ?
YES
NO
Is the correct voltage at the loading
motor terminal ?
Check between IC7702 and all the
way up to the loading motor.
YES
NO
Does the loading motor run ?
Replace the cassette cam, gear, etc.
Replace the loading motor.
YES
YES
Is "H" level (about 1.8V) at pin (6) of
IC7702 when reel pulse is inputted ?
Is the PC 5V line normal ?
Are serial clock pulse and TV data
pulse applied to pins (66) and (67) of
IC7701 from IC1001 ?
YES
Are system control data pulse and
system control ready pulse applied to
pins (18) and (17) of IC1001 from
IC7701 ?
YES
YES
YES
Does power control (H) signal at pin
(21) of IC7701 change from "L" to "H"
level when power key is pressed ?
To Next Page
Loading...
