Part Numbers



BELCO REPAIRS                               MERLIN REPAIRS


Repairs and new boards are available at Merlin Controls

Part Numbers for parts listed here.

  • Merlin Controls provides repair services for all BELCO Merlin control boards produced since 1976
  • Because Merlin Control is the OEM for BELCO boards, our inventory includes all of the Merlin Control electronic parts, some which are no longer commercially available. The original Program ROM masters and programmable Logic Arrays, which were used on the original designs, are available for repairs and spare parts.
  • Merlin Controls can also offer program and circuit upgrades to enhance the performance of the original equipment.



  • We can return your control's operation back to original specifications and provide calibration traceable to the National Bureau of Standards.


Calibration Recommendation

Merlin II Automatic High Voltage Control, MSA7006 Control Board.

Calibration of the analog circuits of the control normally starts showing signs of drift after four to five years of operation. This drift may be accelerated with higher operating temperatures.

Insuring operation of the control within this drift window, the control should be calibrated every two to three years. Under severe conditions, operating temperatures consistently above 120E F , calibration is recommended every one to two years.

The calibration may be performed on site, or the boards may be returned for calibration.

FMDK Technologies Inc provide calibration services traceable to the National Bureau of Standards. This service is available on site.

FMDK Technologies Inc. Repair, Parts and Merlin services are the only OEM authorized (BELCO) facility. The procedures and bench service fixtures have been purchased by FMDK and are all from the Merlin original equipment supply, testing and certification.



One of the many test fixtures configured to duplicate field conditions

Merlin® Controls -  FMDK Technologies, Inc.