[TechAssist] Re: Realistic Stereo Receiver STA-2100
- From: "Michel Cusson" <cm2k00@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 12 Nov 2001 22:42:14 -0500
Here's an oldie but goodie: Is there any ground screws holding the boards??
Tighten them or just add a solid ground close to the contact points of
that(those) screw(s).
Got bit a few times by those pesky conceptual shortcuts...
Cm2k
>From: "radio" <radiodoc@xxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: Realistic Stereo Receiver STA-2100
>Date: Mon, 12 Nov 2001 18:52:04 -0500
>
>
>Measure the voltage at the output , if zero then the problem is in the
>protection circuit.
>If the output is getting hot this is an indication of a shorted or leaky
>component(drive /output) if they remain cold check for open resistor in
>bias
>circuit.
>Scope the output if unstable check for noisy transistor or capacitor in
>differential amp.
>Off balance is often cause by an open feedback circuit (output to
>differential amp)
>
>----- 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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