[TechAssist] Re: Pioneer Stereo SX-1010 static and severe popping in speakers
- From: Ed Gaidies <teltek3@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 29 Jan 2005 10:48:40 -0500
Gary;
I had one of these about 3 years ago. Finally told the customer to take
it to Pioneer.
When it was fixed...he brought in the Invoice and the parts they
replaced. I can check back, because I entered it to my database
(somewhere). But there was about 8 small electrolytic and 4 small
signal transistors. So I suspect it was 4 caps and 2 transistors per
side.
Caps were around 47ufd/35volts.
These were on the pre-amp out.
I'll check this weekend and see if I still have the list of stuff they
changed.
-Ed-
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
teltek@xxxxxxxxx
On 29-Jan-05, at 9:02 AM, gulftech@xxxxxxxx wrote:
> 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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