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Pioneer Sx-1050 Right Channel Extremely low

Ozzie Rivera

Ozzie Rivera

New Member
I've had my receiver about a year. The unit was completely recapped and all transistors, including the power transistors, were replaced. Pots were also deox'd and the tuner refurb'd. A few months ago the right channel started to drop intermittently. At first I thought it was the balance pot as I could get it to come back after playing with it. The right channel eventually dropped to a very faint output which goes up slightly at full volume but still barely audible. I can sometimes here very faint switching in the right channel when cycling the filter switches. This occurs with all outputs and speaker combinations. I changed the balance pot to rule it out but no change. Does anyone have any troubleshooting suggestions for this unit? Has anyone seen this problem with SX-1050?
 
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Wiggle/push/clean all push buttons and flip switches.

To make sure both channels of the main power amplifier section is working, connect something with a volume control into the "Main-in" inputs in the rear.
 
cademan said:
Wiggle/push/clean all push buttons and flip switches.

To make sure both channels of the main power amplifier section is working, connect something with a volume control into the "Main-in" inputs in the rear.
Click to expand...


I used an MP3 player in the Tape, Aux, even the phono inputs (at lower volume), no difference. There is no "Main Input" other than the "Pre-In" and "Power Out" which I had an EQ plugged into but jumpered for now.
 
Did you wiggle all of the switches & push buttons like cademan suggested to see if one of them was the cause? Trying to rule out dirty contacts.
 
kwayde said:
Did you wiggle all of the switches & push buttons like cademan suggested to see if one of them was the cause? Trying to rule out dirty contacts.
Click to expand...


Wiggled the filter switches, bass, treble, balance, volume, anything I could actuate. Frustrating considering this unit was fully restored.
 
cademan said:
connect something with a volume control into the "Main-in" inputs in the rear.
Click to expand...

Ozzie Rivera said:
There is no "Main Input" other than the "Pre-In" and "Power Out" .
Click to expand...

There is no "Power Out" or "Pre-In"

Some manufactures used the term "Main in" others, in this case, "Power in" they're the same thing with "in being the operative word for input

@cademan & @avionic mean this

Screen Shot 2022-01-22 at 9.24.36 PM.png
 
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Ozzie Rivera said:
I used an MP3 player in the Tape, Aux, even the phono inputs (at lower volume), no difference. There is no "Main Input" other than the "Pre-In" and "Power Out" which I had an EQ plugged into but jumpered for now.
Click to expand...
"Main-in" is the same as "power-in" as shown in Dswankey's pic. I researched before I mentioned this in my post. The 1050 can be used as a straight power amplifier driven by a separate preamp of your choice. The 1050 can also be used as a straight preamp to drive any other power amplifier of your choice. Manufacturers made stuff like this for versatility in building big or mix or match sound systems.

An EQ should only be used via the tape loop.
 
Checked all the fuses I could find. Life tested all the switches/knobs. Even tried tapping/poking around preamp board with a non-conductive tool. Not sure where to go from here.
 
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