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M9/M11 Sterilizer Door Motor System Location / Function Test and Repair

WARNING

To prevent risk of shock always disconnect power before removing covers or performing any service procedure.

Model Range -020 thru -022, -033, -034

Model	M9M11 -020 thru -022, -033, -034
Serial Number	All

M9/M11 Sterilizer Door Motor System

At the end of the Sterilization Mode

When pressure in the chamber drops to 0.7 psi (5 kPa), the PC board bypasses the motor switch and supplies line voltage to the door motor.

The door motor rotates the cam causing the motor switch to close. Now, the current to the door motor flows thru the motor switch. As the cam rotates, the connector rod causes the latch lever to open the door.

When the cam reaches the bottom of its travel, the motor reverses direction. When the cam reaches its starting position, the motor switch opens, stopping the current flow to the door motor.

To test the door motor

1.Disconnect two wires from door motor.

2.Set meter to 20K Ω

3.Place meter probes on door motor terminals.

Meter Reading	Required Action
115V models: 6620 Ω +/- 20%	Perform PC Board Relay Test
230V models: 12,200 Ω +/- 20%	Perform PC Board Relay Test
Any reading out of the acceptable range	Replace door motor

Model Range -040 thru -043

Model	M9M11 -040 thru -043
Serial Number	All

M9/M11 Sterilizer Door Motor System

At the end of the Sterilization Mode

When pressure in the chamber drops to 0.7 psi (5 kPa), the PC board bypasses the motor switch and supplies line voltage to the door motor.

The door motor rotates the cam causing the motor switch to close. Now, the current to the door motor flows thru the motor switch. As the cam rotates, the connector rod causes the latch lever to open the door.

When the cam reaches the bottom of its travel, the motor reverses direction. When the cam reaches its starting position, the motor switch opens, stopping the current flow to the door motor.

To test the door motor

1.Disconnect two wires from door motor.

2.Set meter to 20K Ω

3.Place meter probes on door motor terminals.

Meter Reading	Required Action
115V models: 6620 Ω +/- 20%	Perform PC Board Relay Test
230V models: 12,200 Ω +/- 20%	Perform PC Board Relay Test
Any reading out of the acceptable range	Replace door motor