[TechAssist] Re: Sony SL-2500 Beta Dead, Part ID

From: "Bruce Youmans" <youmans@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Thu, 10 Jan 2002 05:48:06 -0700

Don,

I have traced the 12 volt input of IC3 back to the relay. The relay is not
being activated. Has 12 volts on relay coil. I have checked the transistor
that grounds the other side of the relay coil and it is fine. Relay is fine.
I have tried manually shorting the relay contacts. 12 volts come up, but
still no clock and no function operation.

Bruce
----- Original Message -----
From: Don-WRF Electronics <wrf_88@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 10, 2002 3:22 AM
Subject: [TechAssist] Re: Sony SL-2500 Beta Dead, Part ID


>
> Bruce the 12v comes from RL1 and is switched.
>   Don-- ps I never had any faults with that power
> suppy
> either.
>
> --- Bruce Youmans <youmans@xxxxxxxx> wrote:
> >
> > Jerry,
> >
> > There is no 12 volts on the input. Because I'm
> > working without a schematic
> > I'm not sure there is 12 volts on the input when the
> > VCR is in the standby
> > (off) mode. Yes, it is possible an electrolytic
> > capacitor or two may be bad
> > because of the age.. I have checked most of them and
> > so far the ESR is good.
> > I was also thinking that there may be a ICP or low
> > value resistor that has
> > opened. This is because everything is inoperative,
> > even the clock in the off
> > mode. The customer said the VCR was plugged in and
> > one day when they went to
> > use it everything was dead. I have checked all three
> > of the fuses and they
> > are OK. There are some voltages on the power supply
> > board in various
> > locations. Not sure if they are correct. Any other
> > thoughts you might have
> > are appreciated.
> >
> > Bruce
> > ----- Original Message -----
> > From: J Silverman <greentron@xxxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, January 08, 2002 10:45 AM
> > Subject: [TechAssist] Re: Sony SL-2500 Beta Dead,
> > Part ID
> >
> >
> > >
> > > If that IC has 12 volts input, it should have 9
> > volts output. If there is
> > no
> > > 12 volts the problem is elsewhere. I dont recall
> > ever having a power
> > problem
> > > with that model. Considering the age, I would
> > think some of the
> > electrolytic
> > > capacitors may be dried out.
> > > Jerry Silverman
> > > Greentron Inc
> > > 4 Newland Ave
> > > Greenville SC 29609
> > > 864 232 3889
> > > Fax 271 2080
> > > mailto:greentron@xxxxxxx
> > > ----- Original Message -----
> > > From: "Bruce Youmans" <youmans@xxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, January 07, 2002 12:50 PM
> > > Subject: [TechAssist] Re: Sony SL-2500 Beta Dead,
> > Part ID
> > >
> > >
> > > >
> > > > Thanks Jerry.
> > > >
> > > > I have been trying to repair this VCR without a
> > schematic. The part had
> > no
> > > > information on it. I was hoping that this part
> > would be the reason the
> > VCR
> > > > is dead, has no display, and no function
> > operation at all.
> > > >
> > > > Bruce
> > > > Bruce's TV Service
> > > > Sierra Vista, Arizona
> > > >
> > > > ----- Original Message -----
> > > > From: J Silverman <greentron@xxxxxxxxxxxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Monday, January 07, 2002 9:58 AM
> > > > Subject: [TechAssist] Re: Sony SL-2500 Beta
> > Dead, Part ID
> > > >
> > > >
> > > > >
> > > > > That is a 78M08, standard 8 volt, 1/2 amp 3
> > terminal voltage
> > regulator.
> > > > Sony
> > > > > 8 759 170 08.
> > > > > Jerry Silverman
> > > > > Greentron Inc
> > > > > 4 Newland Ave
> > > > > Greenville SC 29609
> > > > > 864 232 3889
> > > > > Fax 271 2080
> > > > > mailto:greentron@xxxxxxx
> > > > > ----- Original Message -----
> > > > > From: "Bruce Youmans" <youmans@xxxxxxxx>
> > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Sunday, January 06, 2002 10:57 PM
> > > > > Subject: [TechAssist] Re: Sony SL-2500 Beta
> > Dead, Part ID
> > > > >
> > > > >
> > > > > >
> > > > > > Need to know the part number for IC3 on the
> > power supply board.
> > > > > > This unit is a Sony Sl-2500, but is similar
> > to a Zenith VR-9775.
> > > > > >
> > > > > > Thanks.
> > > > > >
> > > > > > Bruce
> > > > > > Bruce's TV Service
> > > > > > Sierra Vista, Arizona
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: Bruce Youmans <youmans@xxxxxxxx>
> > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > Sent: Friday, January 04, 2002 9:36 AM
> > > > > > Subject: [TechAssist] Re: Sony SL-2500 Beta
> > Dead
> > > > > >
> > > > > >
> > > > > > >
> > > > > > > Just learned this Sony Beta is similar to
> > a Zenith VR9775 in case
> > > > anyone
> > > > > > has
> > > > > > > information on either.
> > > > > > >
> > > > > > > Thanks
> > > > > > >
> > > > > > > Bruce
> > > > > > > Bruce's TV Service
> > > > > > > Sierra Vista, Arizona
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: Bruce Youmans <youmans@xxxxxxxx>
> > > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > > Sent: Wednesday, January 02, 2002 10:18 PM
> > > > > > > Subject: [TechAssist] Sony SL-2500 Beta
> > Dead
> > > > > > >
> > > > > > >
> > > > > > > > Manufacturer: Sony
> > > > > > > > Model: SL-2500 Beta VCR
> > > > > > > > Symptom: Dead
> > > > > > > >
> > > > > > > > Received today a Sony Beta VCR for
> > repair. Not sure this is
> > worth
> > > > > > digging
> > > > > > > into unless it may be something simple.
> > Unit is totally dead. No
> > > > display
> > > > > > or
> > > > > > > any action when the power button is
> > pushed. Primary fuse, F1, is
> > > fine.
> > > > > No
> > > > > > > schematic on this one and the unit is
> > pretty compact so I hate to
> > > dig
> > > > > into
> > > > > > > it without some advance help. Any help
> > would be appreciated.
> > > > > > > >
> > > > > > > > Bruce
> > > > > > > > Bruce's TV Service
> > > > > > > > Sierra Vista, Arizona
> > > > > > > >
> > > > > > > >
> > ------------------------------------------
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> > > > > > >
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Follow-Ups:
- [TechAssist] Re: Sony SL-2500 Beta Dead, Part ID
  - From: Don-WRF Electronics
References:
- [TechAssist] Re: Sony SL-2500 Beta Dead, Part ID
  - From: Don-WRF Electronics
[TechAssist] Re: Sony SL-2500 Beta Dead, Part ID

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