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Counterpoint SA-3000 Service Manual
Counterpoint SA-3000 Service Manual
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Old 3rd December 2017, 06:42 PM  
tenelson is offline tenelson  United States
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Default Counterpoint SA-3000 Service Manual

I'm looking for the service manual for the Counterpoint SA-3000 Preamp. I know the designer used to sell it, but he has since closed up show.

The particular problem I'm having is that the IREF LED, LED503, is not lit, which indicates the high voltage section is not functioning. In addition, the 555 timer that switches the relay is not turning activating. These things worked before a recap, so I suspect I lifted a pad, but I need to know where.
 
Old 3rd December 2017, 10:24 PM  
georgehifi is offline georgehifi  Australia
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Got some stuff but this is all


Cheeres George
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Old 3rd December 2017, 11:03 PM  
rayma is online now rayma  United States
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Quote:
Originally Posted by tenelson View Post
IREF LED, LED503, is not lit, which indicates the high voltage section is not functioning.
In addition, the 555 timer that switches the relay is not turning activating.
It's probably the timer circuit. If the timing capacitor is a large value electrolytic,
you may have to use a special low leakage type for the circuit to work properly.
The capacitor leakage "resistance" has to be much larger than the timing resistor feeding it.
 
Old 4th December 2017, 01:53 AM  
tenelson is offline tenelson  United States
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Thanks to George for the schematic sections.
Rayma, is the capacitor resistance essentially ESR? So I should be looking for a cap with a large ESR?
 
Old 4th December 2017, 03:53 AM  
PRR is online now PRR  United States
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Not ESR, leakage.

99% chance a fresh modern cap will be fine. Leakage today is much less than before.
 
Old 4th December 2017, 03:07 PM  
rayma is online now rayma  United States
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Quote:
Originally Posted by tenelson View Post
I should be looking for a cap with a large ESR?
No, something like these. If the timing resistor is say 100k or more,
this could be the problem. It's happened to me before.
Nichicon Low Leakage Aluminum Electrolytic Capacitors Nichicon Aluminum Electrolytic Capacitors - Leaded | Mouser

Last edited by rayma; 4th December 2017 at 03:33 PM.
 

 

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