13VT-L100/150
13VT-CL10
FLOW CHART NO.1-9
Check the AT 5V line.Check the AT12V line.Check the drum motor.
Check or replace IC7701.
Check between the ME socket and pin (78) of IC7701, and between the ME socket and pin (76) of IC7701.Check between the ME connector and all the way up to pin (86) of IC7701.
NONONONONONO
The drum motor fails to run.
DRUM MOTOR TROUBLESHOOTING
The drum motor runs only for a few seconds.
YESYESYESYESYESYES
Check pin (76) of IC7701.
IS H.SW. pulse at pin (18) of IC7701?
Is the voltage more than about 2.6V applied at pin (1) of ME connector.Check/replace the drum motor.Is drum PG signal at pin (5) of ME connector?Is drum PG signal at pin (86) of IC7701?
Is 5V at pin (7) of ME connector?Is 12V at pin (4) of ME connector?
FLOW CHART NO.1-7
Check between D7702 and pin (80) of IC7701, between D7703 and pin (79) of IC7701.See FLOW CHART NO. 1-9.Check pin (18) of IC7701 and signal line of head switching pulse.Check all the way up to pins (86) and (87) of IC7701.
YESNOYESYES
NONOYESNONO
Is the drum motor rotating?
Are there the take up/supply reel pulses at the collectors of D7702/D7703.Replace the take up/supply reel sensors D7702/D7703.Are the drum PG and drum FG signal inputted to pins (86) and (87) of IC7701, respectively?Are there the drum PG and drum FG Signals at pins (3) and (5) of connector AD?Check the harness AD-ME and the drum motor unit.
Insert the cassette, and put the unit in FF or REW mode.No head switching pulse.
No reel sensor pulse appears.
4.40
4.20
HEAD SWITCHING PULSE TROUBLESHOOTINGFLOW CHART NO.1-8
TAKE-UP REEL PULSE GENERATOR TROUBLESHOOTING
about 4.5Vp-p
D-PGD-FG
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