[TechAssist] Re: Realistic Stereo Receiver STA-2100
- From: "Ray Lufkin" <Rlufkin@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 12 Nov 2001 21:07:56 -0500
You have a dc offest oin the base of your outputs. Check to see which
polarity. To work on this unit lift all output leads and see if you can
signal trace a sine wave thru the circuit. See where it gets bad. Should be
able to see good signal drive on pad of lifted base on putputs.
----- Original Message -----
From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, November 12, 2001 3:57 PM
Subject: [TechAssist] Re: Realistic Stereo Receiver STA-2100
>
> Thanks Frank;
> I have isolated it to Right side.
> If I remove the B+ from one side, (unit has two modules, relay will click
> and good side will work).
> Have checked the transistors on the defective side, 4 mounted on heat
sink,
> and small drivers on the same module. Have checked them in circuit, and
are
> not shorted, although not sure if one may be leaky.
> Any thing I should look for.
>
> Thanks.
>
> -Ed-
> teltek@xxxxxxxxxxx
> TEL-TEK ELECTRONICS.
>
>
>
>
>
> ----- Original Message -----
> From: "RS Tek Inc" <rstek@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, November 12, 2001 9:10 AM
> Subject: [TechAssist] Re: Realistic Stereo Receiver STA-2100
>
>
> >
> > Check the power supply that runs the protection circuit. They can go
bad,
> > also the transistor that sinks the relay can open up as well. See if
you
> > have dc on the speaker contacts that feed the relay.
> > Good Luck
> > Frank
> > ----- Original Message -----
> > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
> > To: "AAAA TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, November 12, 2001 1:44 PM
> > Subject: [TechAssist] Realistic Stereo Receiver STA-2100
> >
> >
> > >
> > > Anybody worked on these old Stereos.
> > > Customer complained of relay cutting out periodically.
> > > Now relay won't activate at all. All O/P transistors good. -57 and +57
> > volts
> > > on collectors. No fuses blown. Have 24 volts at relay coil. About all
I
> > can
> > > say, since I have no Circuit for this.
> > >
> > > Thanks;
> > >
> > > -Ed-
> > >
> > >
> > > teltek@xxxxxxxxxxx
> > > TEL-TEK ELECTRONICS.
> > >
> > >
> > >
> > >
> > >
> > >
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