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CP4500 Stereo Bus Compressor
In case your CP4500 doesn't work as expected
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Topic: In case your CP4500 doesn't work as expected
December 15, 2020, 08:28:04 AM
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JPK
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Posts: 1118
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In case your CP4500 doesn't work as expected
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
«
Last Edit: December 21, 2023, 04:55:19 PM by JPK
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In case your CP4500 doesn't work as expected
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