Sound Skulptor forums
Build help and troubleshooting => CP5176 FET compressor => Topic started by: RFR on April 13, 2026, 12:30:02 PM
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Hi community,
I'm having an issue with my 2nd CP 5173 (#2).
I don't get the voltages at TP2 & TP3 compared to my 1st unit (#1).
Anything from 1:2 to 1:20 doesen't come close measurements.
Also I see a bigger gap on TP1 when I increase Source Voltage. Did I install T1 wrong? I'm sure I checked this 2 times prio soldering.
I can exclude front PCB, as I have the same results when using the front #2 at main #1 pcm.
Any idea why my Voltages are tht so far off?
Measurements:
(https://i.imgur.com/Yloy8Yd.png)
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Adding measuments from Trouble Shooting Guide
2.)
V+: +15,9 VDC
V-: -15,93 VDC
L1: 55 mVDC
No Signal
A: 12,8 VDC
B: 0,587 VDC
C: 13,41 VDC
D: -0,135 VDC
E: 15,14 VDC
F: 0,784 VDC
G: -15,16 VDC
3.)
TP1: 538 mVAC
TP2: 7,26 VAC
L1: 10,9 VAC 1:2-1:20
13,3 VAC @Slam
4.)
TP3
1:2 = 0,178 VAC
1:4 = 0,353 VAC
1:8 = 0,570 VAC
1:12 = 0,950 VAC
1:20 = 1,62 VAC
Slam = 7,18 VAC
TP4
1:2 = 0 VDC
1:4 = -0,5 VDC
1:8 = -1,34 VDC
1:12 = -2,46 VDC
1:20 = -5,50 VDC
Slam = -0,64 VDC
JMP1 Pin 1
1:2 = 0,073 VDC
1:4 = -0,010 VDC
1:8 = -0,012 VDC
1:12 = -0,015 VDC
1:20 = -0,018 VDC
Slam = 8,860 VDC
TP6
-3,61 VDC
TP5
0,32 VDC
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Hi, topic is resolved.
After checking and checking and not finding any issues, I decided to go through the set-up procedure again.
I'm not sure what I did wrong on my first try but there is something in the setup-guide what leads to do interprate to do something wrong.
I believe it's the route cause is the P5 initial position during set-up at step 6.
Anyway, there was nothing wrong
TP3 and JMP1 values match now.