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Toshiba SDV398 Stops recording prematurely

Discussion in 'Electronic Repair' started by Boris Mohar, Jan 4, 2013.

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  1. Boris Mohar

    Boris Mohar Guest

    Toshiba SDV398 VHS/DVD combo with built in tuner.

    Everything works but occasionally it stops recording about 15 minutes short
    of programmed time. The clock keeps the correct time and the tape is new.
  2. N_Cook

    N_Cook Guest

    with a stop watch , check it is exactly 15 minutes to the second or just
    plus or minus 5 minutes say, for 1 , 2 and 3 hour records , also try with 3
    hour and 4 hour tapes to see if there is a difference
  3. N_Cook

    N_Cook Guest

    the most likely reason.
    Either loss of friction in a slip clutch or wear in a pivot allowing a
    pulley in the jockey wheel assembly to touch the chassis, both situations
    when sufficient diameter of tape has built onto the take-up spool to trigger
    the loss of drive
  4. Boris Mohar

    Boris Mohar Guest

    It never fails on playback. Could there be some subtle transport load
    difference between record and playback?


    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things)

    void _-void-_ in the obvious place
  5. Everything works but occasionally it stops recording about
    My first VCR, circa 1981, had a timer problem connected with an incorrectly
    designed chip. If you set it to (say) start recording at 11:30PM and stop at
    1:00AM, it would often quit at midnight.
  6. N_Cook

    N_Cook Guest

    So a divide by zero / year 2000 type problem with that one. I would have set
    the clock 12 hours out on that one, assuming only recording over midnight
    and never noon
    Perhaps the OP should take a careful note of times , assuming there is a
    timecode recorded , then see if there is a consistency in the drop out times
    at recording.
  7. N_Cook

    N_Cook Guest

    I just looked through my repair tips , maybe relevant

    Ferguson FV21
    Manual record and short lead-time timed record OK but failure
    of overnight record.
    Replaced the the 3 small electrolytics on the clock / timer panel
    and broke / inspected /remade all connections and
    also at someone's suggestion tightened all earthing point through-pcb
    screws on the various boards.Somewhere along the line must have
    effected a cure.
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