[TechAssist] Re: Goldstar GCV1924M TV/VCR - mechanism problem-Further
- From: "Christopher Barnak" <cbarnak@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 10 Nov 2005 07:28:42 -0500
Maybe the load motor SHOULD BE running and it can't
because there is no voltage supplied to it.
Unplug set.
Rotate the motor to move the guideposts up alittle to
put the mechanism in a position that the unit would
normally try to reset to the stop postion upon plug in.
If the unit does not try to correct itself, then check the
voltage being supplied to the load motor. It should be
there and ususally about 12 volts.
If not, then check that the Micro is actually telling the
loading motor IC to do it's job. If you do not have the
schematic, then look up an equivalent IC in the NTE
book and find what pins are the control pins.
If the IC does not get a control signal from the Micro,
then either the micro is partially not working or look
for the most overlooked - A broken pattern.
You may already know all this stuff, but I'm just
writing it in case you don't.
Good Luck,
Chris
>>> rogerfixit@xxxxxxxxxxx 11/09/05 7:04 PM >>>
Load motor does NOT run; take up reel does.
Resoldered sensor board; reconditioned mode switch; cleaned surfaces on
reels - no difference.
Note = power switch has no effect and TV does not come on either.
Starting to suspect micro problem.
Anything else ??
Thanx
Roger G.
Mr. Fix-It Harrisburg, PA 17110
WebSite- http://mrfixit.netfirms.com
Alternate - rogerfixit@xxxxxxxx
FAX 510-740-3641; Tel: 717-540-0799 (shop)
Christopher Barnak wrote:
> Roger,
> If the loading motor runs when set is plugged in, then the
> cassette load or tape load mechanism is bound up and
> the mode switch never reachs the stop or eject position.
> Could be the mode switch, I refurbish almost all mode switchs
> on units that come in with a control type of problem.
> And I
> If the load motor does not run, but the unit takeup reel
> turns on power up, then I would suspect that the unit
> has a reel sensor under the supply reel and it is not
> working. It is common in many VCR's for the Micro to
> run the takeup reel and then look for a pulse from the
> the supply reel sensor. This is to make sure no slack
> is in the tape. (Remember the Sharps that would not
> eject a broken tape).
>
>
> Christopher Barnak, CET
> Norfolk Public Schools
> Electronics Maintenance
> 966 Bellmore Ave.
> Norfolk, Va. 23504
>
> Phone 757 628 3385
> Fax 757 628 3392
> cbarnak@xxxxxxxxxxxxx
>
>
>>>> rogerfixit@xxxxxxxxxxx 11/08/05 10:37 PM >>>
> Goldstar GCV1924M Combo
> Problem- Customer said was playing a tape then stopped. Tape is
stuck.
> I found unit in full load condition with tape broken and all of it on
> take-up reel. Power-on starts takeup reel turning.
> Ran load motor (with external power) to eject tape and reset unit.
> Reattached to unit expecting it to work BUT - all that happens is
> takeup
> reel turns - power button or eject btns do not function.
>
> Pulled tape transport. Checked alignment; bottom slider; mode switch
> sensor circuit board - all looked ok. Load motor is ok - ran it to
> eject.
--
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