[TechAssist] Re: Pioneer Stereo SX-1010 static and severe popping in speakers
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 29 Jan 2005 08:02:02 -0600
Gary,
I don't know if I can be of much help with this, but just maybe...
I haven't worked on those in the past 15 years or so, but I remember some
unusual differential amps that Pioneer used that caused that sort of
problem. Think they had five legs, with two transistors together. Try
shooting them with cold spray to see if it acts up.
HTH,
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice), 850-932-0819 (fax)
On Fri, 28 Jan 2005 21:24:46 -0500 Gary McCartney <gary@xxxxxxxxxxx>
writes:
> I have this old Pioneer Stereo from the 70's, model SX-1010 (same one
> as
> I broke the shaft on- from another post to the list).
>
> There is static and intermittant snap, crackle and pop coming out of
> the
> speakers or headphones. Sometimes it is strong enough to kick out
> the
> speaker protection relay. This is very intermittant, sometimes it is
>
> heard in the left channel, sometimes the right, other times, both
> channels. Problem occurs whether unit is set to AM, FM, or audio
> inputs,
> and doesn't matter how I set any the switches or pots.
>
> I have: cleaned and lubricated all controls, soldered every board
> except
> for tuner boards, replaced a number of tranistors and open caps in
> the
> power supply. Have removed jumpers between pre-amp out and power amp
> in,
> so that I know it must be in the power amp section or power supply.
> Have
> also grounded pre-amp outs and power amp inputs to eliminate noise.
>
> Can it be the audio output transistors? If so, is it likely that
> both
> channels would be acting up?
>
> I don't have a schematic.
>
> Thanks for any help.
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
>
>
>
>
>
>
>
>
>
>
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