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Sears LXI 564 - equalizer not working

L

LordAragorn

New Member
Acquired this nice looking and very good sounding Sears LXI 564 receiver. Everything works; except for the equalizer. I’ve cleaned the tone on/ off button as well as all slide pots but it made no difference. At 75wpc, this is a powerful receiver and I love the sound.

I checked the PCB for a failed component but found none. Does anyone know what is causing the equalizer not to work and what the fix would be? Thank you!
 

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Welcome aboard Lord :biggrin:

Well. You're going to need a schematic. Back in the early 90's. I worked PT for a SEARS Service dept. (Div. 57) in Mary Ester, Florida. All of the service data at that time was on microfiche. Might be able to find it online.

Might need to disassemble and clean / replace the TONE DEFEAT switch. But without a schematic it will be tough to isolate your issue. Even for a seasoned veteran tech.
 
avionic said:
Welcome aboard Lord :biggrin:

Well. You're going to need a schematic. Back in the early 90's. I worked PT for a SEARS Service dept. (Div. 57) in Mary Ester, Florida. All of the service data at that time was on microfiche. Might be able to find it online.

Might need to disassemble and clean / replace the TONE DEFEAT switch. But without a schematic it will be tough to isolate your issue. Even for a seasoned veteran tech.
Click to expand...
Thank you, @avionic! I Googled but people are selling photocopies for $30 . I cleaned the pots again and the 250Hz pot works but none of the other. I wish I could find the schematics. The tone defeat switch tested fine on the multimeter so I don’t think that’s the issue (I had previously suspected if that was the case)
 
I just picked up the same receiver with the same issue, 2 of my slide pots work, but what I found is the "brushes/brass wipers" (Unsure of the right terminology) inside had broken free and were floating around. Sometimes they would fall into just the right spot and jam the slider so I knew to look for something broken internal to the components. Unfortunately I don't know what the replacements would be.....there's no part number printed on the pots that I can find. I'll update as I dig in more, I picked this up as a little project a couple days ago. I'm looking to get more into basic electronics so this seemed ideal.
 
286rocks said:
I just picked up the same receiver with the same issue, 2 of my slide pots work, but what I found is the "brushes/brass wipers" (Unsure of the right terminology) inside had broken free and were floating around. Sometimes they would fall into just the right spot and jam the slider so I knew to look for something broken internal to the components. Unfortunately I don't know what the replacements would be.....there's no part number printed on the pots that I can find. I'll update as I dig in more, I picked this up as a little project a couple days ago. I'm looking to get more into basic electronics so this seemed ideal.
Click to expand...
Boat anchor.
 
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