Author Topic: In case your CP4500 doesn't work as expected

December 15, 2020, 08:28:04 AM
Read 3022 times

JPK

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Voltages Checks
Channel 1
Step.....ConditionsResult
1.1Mix = 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



1.2Step 1 conditions plus:
Input signal = 0V
Threshold on +15
Makeup on 0
TP1, TP2, TP3, TP4, TP11, TP12 = 0VDC



1.3Step 1 conditions plus:
Input signal = 0V
Threshold on +15
Rotate Makeup from 0 to +20
TP12 goes from 0 to -2.3VDC



1.4Input signal = 0V
Makeup on 0
Rotate Threshold from -15 to +15
TP13 goes from -1.8V to +2.8VDC



1.5Input 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



1.6input 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.



1.7input 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.....ConditionsResult
2.1Mix = 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)


2.2Step 1 conditions plus:
Input signal = 0V
Threshold on +15
Makeup on 0
TP6, TP7, TP8, TP9 = 0VDC



2.3input 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



2.4input 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 »
JPK