Thanks a lot for your feedback!
1. Resistance on charge pump output (pins 1,4) - 3.2 kOhm
2. Resistance on charge capacitor (pins 3,5) 0.35M? C=3.3uF
3. Measure the input voltage of charge pump (pins 2,4) - 5.2V
4. Measure directly output voltage of charge pump (pins 1,4) - 0.5V
If no volt, then, while circuit is powered place an external power supply on -5V
Is it ok to place 5V from external source to charge pump ground and ground from ext. sourse to charge pump out?/\r\n/

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[agmihos 2017-10-27 06:08:47]:
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I suggest you the following:/\r\n/First, while power is off, measure the following:/\r\n/1) Resistance on charge pump output (pins 1,4) . If resistance is less than 10? then probably you have shortcircuit at the output (accententaly soldered together pins), or damaged charge pump. Less like to have damaged capacitors C26, C27. If you have accintentaly place voltage to AWG, may the problem caused by a damaged TL064 (U3)/\r\n/2) Resistance on charge capacitor (pins 3,5) . If resistance is less than 10? between or by any other pin of charge pump, then you have damaged charge pump. Less like to have damaged to capacitor C25./\r\n/If no problem found, power up circuit./\r\n/1) . Should be 5V. If not, problem is before charge pump. Check for a broken PCB line. If voltage is over 5.5V then the problem is power supply./\r\n/2) Measure directly output voltage of charge pump (pins 1,4). If you found -5V then check for a broken line after charge pump. If no volt, then, while circuit is powered place an external power supply on -5V. Be careful to place correct voltage and polarity. Also, after test completed remember to cut first external -5V, and THEN xprotolab power supply. If current is high, then a cheap infrared thermometer can help you to find the damaged part.

According to your measurements most likely your charge pump is dead.
Yes you can place voltage to the output, BUT ONLY if you first power up your xprotolab. After test remember to cut -5V prior to shut down, and off course to have the correct polarity.
Is an unorthodox method, but the only one left to do.
-5V is better to placed gradually, and if you are able to adjust maximum current, put about 50mA.
While -5V is externaly applied xprotolab should work fine.
Is unusual to burn a charge pump, especially two in a row. Maybe is a good idea to check your circuit connected to xprotolab, to find cause of damage.

Thanks for a good idea with external -5V.
Device worked well, so I decided to replace the charge pump it did the job.
?
Unplugged chennels now show 0.0035V. Device works!
Is there a way to calibrate it 0? Didnt found that part in manual.

Thanks for the credits!
I guess speaking 25 years of expirience on marine electronics repair! I was forced to develop some unorthodox methods to resolve hard issues. Some times I'm thinking to write a relative book!
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The information you are looking for, is somewere in the user manual.
If I remember well you press K4 before power supply. Then appear few options, one of them must be it.
I guess you are going to calibrate it after charge pump replace.