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You have to solder a diode at the output of the 15V regulators
Documents:
Crowbx_mount_calibration_carrier_rev1.pdf
Hint for calibrate the Voicecards:
The IC1 and IC4 must not be inserted while doing the calibration, because the DMM- OHMs measurement injects to much voltage which falsify the measure.
Hopefully the Green Lines shows where the Testpoints are 
The both multiturn pots must be adjusted to 61K.
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