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CP4500 Stereo Bus Compressor
Output issues
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Topic: Output issues
March 16, 2022, 07:34:05 PM
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macguy78
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Posts: 17
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Output issues
Hello!
I’m having some problems getting my Multimeter to read 2.0VAC. I’ve used my DAW output and the sine tones provided in the Downloads section, tried using an outboard mixer, and reflowed the output sections on the PCB; no matter what I get a reading of 0.033.
I am stumped at this point and could really use some help. I’m not well versed in using a multimeter either so I could use some guidance as well.
Thanks!
«
Last Edit: March 16, 2022, 07:39:09 PM by macguy78
»
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March 18, 2022, 12:04:37 PM
Reply #1
JPK
Administrator
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Posts: 1105
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Re: Output issues
Check if the output signal is present on TP2, against 0V. It is divided by 2 compared to the XLR output.
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JPK
March 18, 2022, 06:16:14 PM
Reply #2
macguy78
Newbie
Posts: 17
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Re: Output issues
I located the test points and with ONLY the red probe on TP2, the highest i got was .147VAC. The other images show my mixer audio cranked all the way up (with a 1K sine going through it) and the red probe on TP2. As soon as i touched the black probe on 0V, the reading drops to zero.
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March 19, 2022, 06:09:34 PM
Reply #3
JPK
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Re: Output issues
I located the test points and with ONLY the red probe on TP2
You absolutely need 2 probes to get a measure. In this case the black probe goes to 0V.
Now check if you can measure the input signal on TP1 (against 0V also).
And move on with the voltages check
here
.
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JPK
March 19, 2022, 06:20:45 PM
Reply #4
macguy78
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Posts: 17
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Re: Output issues
Ok I’ll try those out.
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March 20, 2022, 03:52:07 AM
Reply #5
macguy78
Newbie
Posts: 17
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Re: Output issues
I reflowed the components and got a proper reading. My CP4500 is calibrated! Thanks for your help!
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March 21, 2022, 04:12:43 AM
Reply #6
macguy78
Newbie
Posts: 17
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Re: Output issues
I’ve tried calibrating a couple of times and at Step 7, I can’t get the VU to read zero no matter how much I turn the output trimmer down. Any idea what I should be looking for?
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March 21, 2022, 09:21:45 AM
Reply #7
JPK
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Re: Output issues
The trimmer T1 doesn't have an effect on the Vu meter.
In step 7 the pots should be in the initial position, with threshold at +15.
Are you saying the meter doesn't stay at 0?
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JPK
March 21, 2022, 12:20:50 PM
Reply #8
macguy78
Newbie
Posts: 17
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Re: Output issues
When the compressor is not engaged, it sits at zero but when it is engaged, the meter moves up a little.
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March 25, 2022, 06:46:23 PM
Reply #9
JPK
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Re: Output issues
You will need to do these measurements: https://www.soundskulptor.com/forum/index.php?topic=3.msg3#msg3
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JPK
April 08, 2022, 06:47:59 AM
Reply #10
forcemusicgroup
Newbie
Posts: 37
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Re: Output issues
CP4500
TP 12 - 2.38v
At step 3 nothing moves on the DMM except .001
Low output
- Voltage checks fine.
TP1, TP2, TP3, TP4, TP11, TP12 = 0VDC
when you have a moment can I get your assistance.... thanks
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April 08, 2022, 04:12:20 PM
Reply #11
JPK
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Re: Output issues
Sorry, I do not understand. What are you results on steps 2 and 3?
Voltages check step 3:
how is TP12 when you rotate Makeup?
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JPK
April 08, 2022, 05:10:26 PM
Reply #12
forcemusicgroup
Newbie
Posts: 37
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Re: Output issues
Voltage check is fine.
Step 2 all readings are normal except tp 12
When rotating the threshold knob the meter changes -.001
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April 09, 2022, 04:06:57 PM
Reply #13
JPK
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Posts: 1105
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Re: Output issues
Step 2 all readings are normal except tp 12
Do you mean TP12 is not 0?
When rotating the threshold knob the meter changes -.001
TP12 voltage depends on MAKUP, not THRESHOLD.
TP13 voltage depends on THRESHOLD.
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JPK
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CP4500 Stereo Bus Compressor
Output issues
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