Hi,
Having some issues with my CP4500, hopefully can get some assistance on where to check, its a bit over my head.
I got to the channel 2 calibration and all was seeming to work fine, all throughout calibrating channel 1. The behavior of each knob was normal and functioning as expected.
When i got to adjusting the trimmer on Channel 2 i had a difference of several dBs beyond the range of the trimmer. I measured all of the voltages from the guide for channel 1 and 2. Here are the results
Any help would be greatly appreciated:
Channel 1| Step..... | Conditions | Result |
| 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,15.97
- V- =-15 to -16VDC),-15.94
- +12V = +11.1 to +12.9VDC,11.93
- -12V = -11.1 to -12.9VDC -11.77
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| 2 | Step 1 conditions plus:
Input signal = 0V
Threshold on +15
Makeup on 0 | TP1, TP2, TP3, TP4, TP11, TP12 = 0VDC TP11: 0.01 VDC
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| 3 | Step 1 conditions plus:
Input signal = 0V
Threshold on +15
Rotate Makeup from 0 to +20 | TP12 goes from 0 to -2.3VDC 0 to -2.3VDC
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| 4 | Input signal = 0V
Makeup on 0
Rotate Threshold from -15 to +15 | TP13 goes from -1.8V to +2.8VDC -1.76 to 2.84
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| 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 0 VDC
- TP5 goes from +0.35VDC to a negative value +0.34 to -1.10 VDC
- TP11 goes from 0VDC to -3.5VDC 0.01 to -3.46 VDC
- TP12 goes from 0VDC to +3.5VDC 0 to 3.5 VDC
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| 6 | input signal = 3VAC
Threshold on +15
Makeup on 0 | Signal level (VAC) on
- TP1=1.5VAC, 1.53
- TP2=1.5VAC, 1.73
- TP3=1.5VAC,1.535
- TP4=0.06VAC0.57
DC voltage (VDC) on
- pin 1 of U6 (white dot) = 0V. 0.0
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| 7 | input signal = 3VAC
Threshold on -15
Makeup on +20 | Signal level (VAC) on
- TP1=1.5VAC,1.53
- TP2=0.4VAC, .423
- TP3=1.5VAC, 1.53
- TP4=0.2VAC .184
DC voltage (VDC) on
- TP11=-3.5VDC, -3.48
- TP12=+1.2VDC, 1.18
- TP13=+1.7VDC 1.73
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Thanks
-KJ
