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CP4500 Stereo Bus Compressor
CP4500 Threshold doesn't work
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Topic: CP4500 Threshold doesn't work
March 16, 2023, 11:07:45 AM
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Chiller
Newbie
Posts: 6
Karma: +0/-0
CP4500 Threshold doesn't work
Hello,
today the Threshold Poti of my CP4500 stopped working. I can turn it as usual, but it has no effect on the signal. Yesterday everything was fine, so I have no idea, why it stopped working. Any solutions?
Thank you!:D
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March 16, 2023, 12:01:10 PM
Reply #1
JPK
Administrator
Hero Member
Posts: 1105
Karma: +36/-0
Re: CP4500 Threshold doesn't work
It could be a pot failure or a connection failure between pot and circuit.
The pot voltage can be checked on TP13 (against 0V)
Check step 1.4
here
.
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JPK
March 17, 2023, 09:30:21 AM
Reply #2
Chiller
Newbie
Posts: 6
Karma: +0/-0
Re: CP4500 Threshold doesn't work
Thanks, I've checked it, and it's just 0.45 to 0.55 VDC, when I turn the threshold. The solder points are good... is there another way to check out if it is the pot?
Thank you
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March 20, 2023, 09:24:12 AM
Reply #3
JPK
Administrator
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Posts: 1105
Karma: +36/-0
Re: CP4500 Threshold doesn't work
R95-left pin should go from +12V to -12V when turning the threshold pot.
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JPK
March 20, 2023, 12:15:10 PM
Reply #4
Chiller
Newbie
Posts: 6
Karma: +0/-0
Re: CP4500 Threshold doesn't work
Yes, that works fine. So the pot is working.
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March 21, 2023, 09:00:55 AM
Reply #5
JPK
Administrator
Hero Member
Posts: 1105
Karma: +36/-0
Re: CP4500 Threshold doesn't work
So the issue is around U21.
Check solder joints and values of R95...R99, U21.
Try swapping U21 with another OPA2134.
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JPK
March 22, 2023, 09:42:17 AM
Reply #6
Chiller
Newbie
Posts: 6
Karma: +0/-0
Re: CP4500 Threshold doesn't work
Hi JPK,
I fixed it! Thank you so much for your help. I renewed all solder joints around that area but I think it was a slightly deformed pin of the U21.
Thanks again and have a good day
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March 22, 2023, 09:50:40 AM
Reply #7
JPK
Administrator
Hero Member
Posts: 1105
Karma: +36/-0
Re: CP4500 Threshold doesn't work
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JPK
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CP4500 Stereo Bus Compressor
CP4500 Threshold doesn't work
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