[TechAssist] Re: Realistic Stereo Receiver STA-2100
- From: "Michel Cusson" <cm2k00@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 12 Nov 2001 22:43:48 -0500
Heat sink isolators ok???
Cm2k
>From: "Ray Lufkin" <Rlufkin@xxxxxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: Realistic Stereo Receiver STA-2100
>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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