[TechAssist] Re: PIONEER REC - MDL: SX-850 NO AUDIO
- From: "becyn" <becyn@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Jul 2003 10:27:12 -0400
Fred,
DID YOU CHECK FOR OFFSET YET???
Seems that you are making this MUCH harder than it needs to be.
Checking individual components with a meter IS NOT the way to fix a unit
like this.
Unless both channels are burned beyond recognition, you really don't need a
schematic.
You can check the good channel for resistor values, etc.
The output amps are a more or less standard complimentary push-pull type.
Fix one, you fixed 'em all!!!
Jim McVey
McVey Alltronix
327 Broadway
Newburgh Ny 12550
ph: 845 561 8383
fx: 845 561 9017
Consumer electronics &
computer service.
Factory authorized for
over twenty brands.
----- Original Message -----
From: <fremur01@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, July 02, 2003 6:55 PM
Subject: [TechAssist] Re: PIONEER REC - MDL: SX-850 NO AUDIO
> Hello,
>
> As a precaution I checked all final output stage transistors:
> (4) 2SD371 AND (4) 2SB531 TopHats. All tested good, so no
> apparent problems there.
>
> However, there was an open cap 47uf/35v on a secondary power
> module. Replaced to no avail. Currently I am trying to locate SAMS
MHF-128
> to figure it out.
>
> PIONEER STEREO MDL: SX-850 NO AUDIO
>
> Thanks,
>
> Fred
> MTS Electronics
> Fayetteville, NC
> fremur01@xxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of becyn
> Sent: Wednesday, July 02, 2003 3:23 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: PIONEER REC - MDL: SX-850 NO AUDIO
>
>
> hello Fred,
>
> You probably have an offset at the outputs.
> The protect mode is invoked.
> Also chech the LV reg's for solder cracks (very common).
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh Ny 12550
> ph: 845 561 8383
> fx: 845 561 9017
> Consumer electronics &
> computer service.
> Factory authorized for
> over twenty brands.
> ----- Original Message -----
> From: <fremur01@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, July 02, 2003 11:40 AM
> Subject: [TechAssist] PIONEER REC - MDL: SX-850 NO AUDIO
>
>
> > Hello all,
> >
> > working on this model receiver, an older unit that
> > powers up fine but has no audio. Customer really like
> > this "classic receiver".
> >
> > The speaker relay never kicks in, there is am/fm
> > tuner response. Any ideas? I will check the outputs.
> >
> > I dont have access to service literature. Does anyone
> > have case history or even access to a schematic?
> >
> > PIONEER STEREO MDL: SX-850 NO AUDIO
> >
> > Thanks,
> >
> > Fred
> > MTS Electronics
> > Fayetteville, NC
> > fremur01@xxxxxxxxx
> >
> > __________________________________
> > Do you Yahoo!?
> > SBC Yahoo! DSL - Now only $29.95 per month!
> > http://sbc.yahoo.com
> >
>
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