[TechAssist] Re: Goldstar GCV1924M TV/VCR - mechanism problem-Further
- From: "Christopher Barnak" <cbarnak@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 21 Nov 2005 07:34:08 -0500
If you do not get a voltage to the VCC pin on the motor
chip, then that's your problem. Often they put a small
value resistor in line to the VCC going to that chip. It is
a fusible type and will sometimes open. If no VCC (usually 12v)
is not on any pin of the chip,then
it's either the resistor or power supply
or connections in between.
Chris
>>> rogerfixit@xxxxxxxxxxx 11/20/05 1:48 AM >>>
Changed the motor driver IC (BA6209 type) but nothing changed.
Do not get voltage to load motor.
About to blame micro and bag it unless someone has another idea.
TIA
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)
Roger G./Mr Fix-It wrote:
> 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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