Sound Skulptor forums

Build help and troubleshooting => CP4500 Stereo Bus Compressor => Topic started by: JPK on December 15, 2020, 08:28:04 AM

Title: In case your CP4500 doesn't work as expected
Post by: JPK on December 15, 2020, 08:28:04 AM

Voltages Checks
Channel 1

Step.....	Conditions	Result
1.1	Mix = 100% Ratio = 10 Attack = 0.1 Release =1.2 IN button pressed HF lift, 100Hz, 50Hz buttons released Negative meter probe on 0V	V+ =+15 to +16VDC, V-  =-15 to -16VDC), +12V = +11.1 to +12.9VDC, -12V  = -11.1 to -12.9VDC
1.2	Step 1 conditions plus: Input signal = 0V Threshold on +15 Makeup on 0	TP1, TP2, TP3, TP4, TP11, TP12 = 0VDC
1.3	Step 1 conditions plus: Input signal = 0V Threshold on +15 Rotate Makeup from 0 to +20	TP12 goes from 0 to -2.3VDC
1.4	Input signal = 0V Makeup on 0 Rotate Threshold from -15 to +15	TP13 goes from -1.8V to +2.8VDC
1.5	Input signal = 3VAC (measured between output XLR pins 2&3 with compressor bypassed) Makeup on 0 Threshold goes from +15 to -15	TP4 goes from 0.060VAC to 0.190VAC TP5 goes from +0.35VDC to -1.2VDC TP11 goes from 0VDC to -3.5VDC TP12 goes from 0VDC to +3.5VDC
1.6	input signal = 3VAC Threshold on +15 Makeup on 0	Signal level (VAC) on TP1=1.5VAC, TP2=1.5VAC, TP3=1.5VAC, TP4=0.06VAC DC voltage (VDC) on pin 1 of U6 (white dot) = 0V.
1.7	input signal = 3VAC Threshold on -15 Makeup on +20	Signal level (VAC) on TP1=1.5VAC, TP2=0.4VAC, TP3=1.5VAC, TP4=0.2VAC DC voltage (VDC) on TP11=-3.5VDC, TP12=+1.2VDC, TP13=+1.7VDC

Channel 2

Step.....	Conditions	Result
2.1	Mix = 100% Ratio = 10 Attack = 0.1 Release =1.2 IN button pressed HF lift, 100Hz, 50Hz buttons released Negative meter probe on 0V	V+ =+15 to +16VDC, V-  =-15 to -16VDC)
2.2	Step 1 conditions plus: Input signal = 0V Threshold on +15 Makeup on 0	TP6, TP7, TP8, TP9 = 0VDC
2.3	input signal = 3VAC Threshold on +15 Makeup on 0	Signal level (VAC) on TP6=1.5VAC, TP7=1.5VAC, TP8=1.5VAC, TP9=0.06VAC DC voltage (VDC) on pin 1 of U16 (white dot) = 0V. TP10=0.35VDC
2.4	input signal = 3VAC Threshold on -15 Makeup on +20	Signal level (VAC) on TP6=1.5VAC, TP7=0.4VAC, TP8=1.5VAC, TP9=0.2VAC DC voltage (VDC) on pin 1 of U16 (white dot) = +0.2VDC TP10=-1.2VDC