Troubleshooting
Should any problem persist after you have made these checks,
consult your nearest Sony dealer.
A cassette cannot be inserted.
t The cassette is being inserted in the wrong way.
t n has been already pressed.
Playback cannot be made.
t The tape has reached the end. Rewind the tape.
t The batteries are weak. Replace both batteries with new
ones.
t The head is contaminated.
Recording cannot be made.
t There is no cassette in the cassette compartment.
t The cassette tab has been removed.
t The batteries are weak. Replace both batteries with new
ones.
t The head is contaminated.
t Improper setting of the VOR switch (M-637V/635VK/
630V/535V/530V only).
Recording is interrupted.
t The VOR switch (M-637V/635VK/630V/535V/530V
only) is set to H or L. When you do not use VOR, set it to
OFF.
During CUE/REVIEW the tape stops or does not run.
You cannot fast-forward or rewind.
t The batteries are weak. Replace both batteries with new
ones.
The unit does not operate.
t The batteries have been inserted with incorrect polarity.
t The batteries are weak. Replace both batteries with new
ones.
t >PAUSE is slid in the direction of the arrow.
t The AC power adaptor is connected to the unit only and
you are going to use the unit on batteries.
No sound comes from the speaker.
t The earphone is plugged in.
t The volume is turned down completely.
The sound drops out or comes with excessive noise.
t The volume is turned down completely.
t The batteries are weak. Replace both batteries with new
ones.
t The head is contaminated. See “Maintenance”.
Tape speed is too fast or too slow in the playback
mode.
t Improper setting of the TAPE SPEED switch. Set it to the
same speed as that used for recording.
Tape speed is faster than the normal playback speed.
t The FAST PB switch (M-637V/635VK/630V only) is slid
in the direction of the arrow.
Recording cannot be erased completely.
t The head is contaminated.