his is a repair service for CST metal detectors manufactured by Berger, commonly affected by volume control issues. A typical fault is the unit either having no volume control or being permanently stuck on maximum volume, which can make it unusable in the field.
Common Faults Repaired:
No volume adjustment
Constant loud audio output
Internal potentiometer or amplifier circuit failure
Intermittent speaker output or distortion
What We Do:
Full disassembly and internal inspection
Repair or replace the volume control and audio section
Bench testing for proper tone control and stability