David Farber wrote in message
...

"N_Cook" wrote in message
...
Will rewind 90 percent of a 4 hour tape in 40 seconds or so and 20s for
the
remainder.
What would allow the motor to run at full tilt ? clunking loudly to a
stop.
If it was not for the "crumple zone" of tape pulled into the gap between
tape roll and spool disc then the tape would have snapped at the end of
tape.
What to look for in the way of a problem ?
System presumably monitors ratio of supply and take up rotation rate and
direction of wind and unlaces tape from drum and over 3 stepped
increases
,
sets at maximum revs until the ratio goes over a preset value and drops
by
stages to a slow rate until end of tape sensor acts.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



I'm not exactly sure what you're saying is the fault. Is it that the motor
is going too fast and/or it is making a clunking noise near the end of the
tape? Newer VCR's do bump up the rewind speed after several seconds to but
I
think you know that already. Is the machine damaging the tape?

--
David Farber
David Farber's Service Center
L.A., CA



It should recognize getting close to the end of tape and start reducing the
power / revs of the motor but it once continued at full revs to the end of
tape. Been monitored by human since it happened. It does not speed up if
human stops the motor close to end, goes normal speed to the normal clear
tape auto stop if REW is engaged again ofter pre-emptive stop.

I'm thinking a break in the line from the fast , take up spool sensor, so
less pulses coming from it and false interpretation.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/