How To Replace The M11 PC Control Board

How To Remove & Install The Midmark M11 Control PC Board


To Replace The Just follow these Step-By-Step Directions

Removing The Old Board
  • Remove right hand side panel (Click Here For Instructions)
  • Disconnect pressure tube (1, Figure 4-14) from pressure sensor (2)

  • NOTE: Units with old style control PC board with EPROM version N or after or new style control PC board will only have two wire harnesses (3) to disconnect instead of three
  • Disconnect two / three wire harnesses (3) from two / three connectors (4)
  • Tag and disconnect two wires (5) from terminals (6)
  • Tag and disconnect two wires (7) from terminals (8)
  • Disconnect ribbon connector (9) from connector (10)
  • Tag and disconnect neutral wire (11) from terminal (12)
  • Tag and disconnect hot wire (13) from terminal (14)
  • Disconnect printer cable (15) from connector (16)
  • Disconnect door switch harness (17) from connector (18)
  • M11 only
  • Tag and disconnect two wires (19) from pulse solenoid terminals (20)
  • Disconnect heater element wire (21) from connector (22)

  • Note: Positions of lock nuts (1) and screws (2) are reversed on newer units
  • Remove two lock nuts (1, Figure 4-15), screws (2), and control PC board (3) and control PC board bracket (4) as an assembly from base (5)
  • NOTE: Units prior to serial number CZ1110/OM1000 have the ground wire attached to the control PC board bracket. When nut (6), star washer (7), and screw (8) are removed, ground wire will also be removed.
  • Remove nut (6), star washer (7), and screw (8) from control PC board bracket (4)
  • Turn three standoff screws (9) 1/4 turn in the counter-clockwise direction and remove control PC board (3) and insulator (10) from control PC board bracket (4)



Installing The Replacement Board
  • Install insulator (10, Figure 4-15) and control PC board (3) on control PC board bracket (4) and secure by turning three standoff screws (9) 1/4 turn in the clockwise direction

  • NOTE: Units prior to serial number CZ1110/OM1000 have the ground wire attached to the control PC board bracket. When nut (6), starwasher (7), and screw (8) are removed, ground wire will also be removed. Make sure ground wire is re-installed upon installation.
  • (2) Install screw (8), starwasher (7), and nut (6) on control PC board bracket (4)

  • NOTE: Positions of locknuts (1) and screws (2) are reversed on newer units
  • Install control PC board (3) and control PC board bracket (4) as an assembly on base (5) and secure using two screws (2) and lock- nuts (1)
  • Connect heater element wire (21, Figure 4-14) to connector (22)
  • M11 only
  • Connect two wires (19) on pulse solenoid terminals (20)
  • Connect wire harness (17) to connector (18)
  • Connect printer cable (15) to connector (16)
  • Connect hot wire (13) to terminal (14)
  • Connect neutral wire (11) to terminal (12)
  • Connect ribbon connector (9) to connector (10)
  • Connect two wires (7) to terminals (8)
  • Connect two wires (5) to terminals (6)

  • NOTE: Units with old style control PC board with EPROM version N or after or new style control PC board will only have two wire harnesses (3) to connect instead of three
  • Connect two / three wire harnesses (3) to two / three connectors (4)
  • Connect pressure tube (1) to pressure sensor (2)
  • Install right hand side panel (Refer to para 4.3)


This product was added to our catalog on Friday 25 May, 2012.



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