Hello,

I built my CP4500 kit, and the first channel is just working fine, but not the second one (PCB B). When I feed the unit with a 2VAC, 1kHZ signal, the max output level i get when the "in" control is engaged si about 1,5VAC at maximum. This level is also not affected by the "thresold" or "makeup gain" controls, contrary to the first channel.

I checked the solder and cleaned the whole PCB in an isopropyl dip since it seems to be a frequent issue. Nothing changed for now. All the ICs seem to be in the good spots and in the right directions.

Here are the results i measured  following the troubleshooting procedure .

Channel 2

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, +16VDC V-  =-15 to -16VDC),   -16VDC +12V = +11.1 to +12.9VDC, don't know  where to measure it -12V  = -11.1 to -12.9VDC  same
2	Step 1 conditions plus: Input signal = 0V Threshold on +15 Makeup on 0	TP6, TP7, TP8, TP9 = 0VDC  0VDC
3	input signal = 3VAC Threshold on +15 Makeup on 0	Signal level (VAC) on TP6=1.5VAC,  1.16VAC TP7=1.5VAC,   2.02 VAC TP8=1.5VAC,   1.16 VAC TP9=0.06VAC  1,09 VAC DC voltage (VDC) on pin 1 of U16 (white dot) = 0V.  -0.023 VDC
4	input signal = 3VAC Threshold on -15 Makeup on +20	Signal level (VAC) on TP6=1.5VAC,   1.16VAC TP7=0.4VAC,   2.02 VAC TP8=1.5VAC,   1.16 VAC TP9=0.2VAC    1.09 VAC DC voltage (VDC) on pin 1 of U16 (white dot) = +0.2V  -0.023 VDC

Thank you guys,