[TechAssist] Re: Goldstar GCV1924M TV/VCR - mechanism problem-Further
- From: "Roger G./Mr Fix-It" <rogerfixit@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 10 Nov 2005 16:58:27 -0500
Chris-
I appreciate your taking the time to post. I did rotate the load mtr off
of stop but it never moved at all. I think there is one of those 10-pin
motor drive IC's which I can check. Problem with this unit- unlike some
where you can power up the VCR separately, it is awkward to troubleshoot
- but somebody has to do it !!
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,
> After re-reading your post. Maybe it is the Micro.
> But, many combo's will not come on until the stop
> or eject mode is correct. So if the mode switch is
> manually set to stop and it still does not come on,
> then I would suspect the micro, BUT check the power
> supply, micro oscillator, B+ to micro and the reset pin
> to make sure it is normal. I suspect a missing voltage,
> as the Micro failure is rare and I've been bit by it so many
> times, only to find out it was something other than the Micro.
> But, it still could be the Micro.
>
> Chris
>
>
>
>>>> cbarnak@xxxxxxxxxxxxx 11/10/05 7:28 AM >>>
> 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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