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

From: "Bruce Youmans" <youmans@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Thu, 10 Jan 2002 12:54:58 -0700

The diode is external and seems to be fine. Both sides of the relay do have
12 volts on them. The transistor which should ground the one side to
activate the relay is not being turned on. I have traced the base connection
to a multi pin IC. There is no output on the IC. Maybe it is bad?

Bruce
----- Original Message -----
From: Lawrence Tucker II <kc4iai@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 10, 2002 10:51 AM
Subject: [TechAssist] Re: Sony SL-2500 Beta Dead, Part ID


>
> ///  Does your relay have an enclosed diode? Even if no current flows you
> should read 12 volts on both sides of the relay if the coil is not open.
>
>
> >From: "Bruce Youmans" <youmans@xxxxxxxx>
> >Reply-To: techassist@xxxxxxxxxxxxx
> >To: <techassist@xxxxxxxxxxxxx>
> >Subject: [TechAssist] Re: Sony SL-2500 Beta Dead, Part ID
> >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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References:
- [TechAssist] Re: Sony SL-2500 Beta Dead, Part ID
  - From: Lawrence Tucker II
[TechAssist] Re: Sony SL-2500 Beta Dead, Part ID

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