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Table 4-4-1 Defective Analyzing List
Defective Phenomenon (Main Items)
Presumed Cause (Main Cause)
Check Method
1
Power does not turn on. Loading
<General>
Check mode shift "Cassette out
operation is defective. Mode shift
Mechanical stops due to mechanical phase
FF/REW position" can be performed
operation is defective.
unmatching.
when turning worm wheel.
Loading motor does not rotate.
(Loading motor is defective or circuit is
defective.)
S reel does not wind the tape.
Refer to case 3 in this table.
<General>
Check mechanical position.
Main brake is not released. (ON)
T soft brake is not released. (ON)
Idoler does not swing.
Pinch does not press.
Check loading motor whether it turns by
the outer power supply (12.5V).
Loading operation is not performed.
Unloading operation is not performed.
2
Playback operation is not performed.
Playback operation is defective.
Capstan motor does not rotate.
(Capstan motor is defective or circuit is
defective.)
Check capstan motor.
<In case of no mechanical problem>
Cylinder is defective.
(Circuit is defective.)
Playback picture does not appear.
Video recording can not be
performed.
Check cylinder assembly.
Reel rotation detection is defective.
Check sensor output.
(Sensor is defective. Circuit is defective.)
Idler does not swing.
Check mechanical position.
Reel belt is removed.
Check the reel belt is removed or not.
Main brake is not released. (ON)
Check mechanical position.
T soft brake is not released. (ON)
Idler does not swing.
Pinch is not released.
Playback interruption.
Detective phenomenon during
playback.
Recording interruption.
FF operation is not performed.
FF operation is defective.
REW operation is not performed.
REW operation is defective.
Others: REV/FF is not performed.
Others: REV/FF is defective.
Capstan motor does not rotate.
(Capstan motor is defective or circuit is
defective.)
Check capstan motor.
REVIEW is not performed.
Main brake is not released. (ON)
T soft brake is not actuated .
Idler does not turn.
Pinch does not press.
Check mechanical positicn.
Capstan motor does not rotate.
(Capstan motor is defective or circuit is
defective.)
Check capstan motor.
<General>
When the F/L is mounted on the
mechanical deck,the position is not correct.
Slot-in is not performed.
Check mechanical position.
Cassette can not be inserted.
Capstan servo does not work.
Capstan servo is uneven.
Tape speed is fast.
Capstan motor is defective.
Check capstan motor.
ACE head control output is defective.
Check ACE head.
Tape speed is slow.
(Circuit is defective.)
Check CTL output.
Tape speed is uneven.
FG pulse is not output.
Audio output does not come out.
ACE head is defective.
Check ACE head. CheckCTL output.
Audio output is small.
Audio output variation is large.
Tape transport adjustment is not defective.
Perform tape transport agustment again
Audio output is uneven.
after confirming tape transport condition.
Audio distortion.
Audio noise.
Hi-Fi head (cylinder) is defective.
Check cylinder. Check wiether B+14V is
Others: Audio is defective.
(Circuit is defective.)
supplied.
Treatment: If the mechanical is found out to be defective according to the procedures described above, perform the followi'g treatment.
*Misassembling, mechanical phase mismatch ....... Repair correctly.
Parts defect, parts damage...
cece
eeeeeeeeeee Replace parts.
If the mechanical is found out not to be defective according to the procedures above, check the circuit(s).
2-6
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