26

CP4500 Stereo Bus Compressor / Re: No Signal On 2nd Channel of the CP4500

« on: January 28, 2021, 10:07:21 PM »

Hi,
I checked out TP7, TP8 and TP9 as you suggested, and they all checked out around 1.5VAC...

I went back to the other posting "In case your CP4500 doesn't work as expected" and when I measured DC voltage on pin1 on U16 I got .8 at +15 threshold and 209.5 at for -15 threshold. Is it possible that the U16 IC is burnt out?

When I was first testing the unit after my build, I did not know that the IC chips had specific placement. The instructions just say to place the IC chips, and since I am new at this and really am just learning, I did not realize that there were specific chips in specific sockets. Consequently, when I was testing Channel A, some of the chips got really really hot. After I turned the unit off and investigated, I realized that the chips had to be placed in specific locations by looking at the components layout document. I rearranged the chips according to the document and channel A worked perfectly. If some of the chips are burnt out, they could be on the channel B PCB causing the weird readout on U16.

What do you think?

Thanks,
Rob (newbie)....

27

CP4500 Stereo Bus Compressor / Re: No Signal On 2nd Channel of the CP4500

« on: January 27, 2021, 06:00:28 PM »

Hi JP,
I went back to the other posting "In case your CP4500 doesn't work as expected" and when I measured DC voltage on pin1 on U16 I got .8 at +15 threshold and 209.5 at for -15 threshold. Is it possible that the U16 IC is burnt out?

When I was first testing the unit after my build, I did not know that the IC chips had specific placement. The instructions just say to place the IC chips, and since I am new at this and really am just learning, I did not realize that there were specific chips in specific sockets. Consequently, when I was testing Channel A, some of the chips got really really hot. After I turned the unit off and investigated, I realized that the chips had to be placed in specific locations by looking at the components layout document. I rearranged the chips according to the document and channel A worked perfectly. If some of the chips are burnt out, they could be on the channel B PCB causing the weird readout on U16.

What do you think?

Thanks,
Rob (newbie)....

28

CP4500 Stereo Bus Compressor / No Signal On 2nd Channel of the CP4500

« on: January 26, 2021, 10:46:53 PM »

Hi,
I don't seem to be getting any signal on channel 2. Channel one seems to be working perfectly, but I do not get any readout on the DMM for channel 2.
What can I do to debug the problem.

Thanks,
Rob