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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
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Figure 7.4 Showing Humidifier Power PCB wiring
7.2.4 Replacement of Transformer
1. Open the case (section 7.2.1).
2. Disconnect the transformer primary and secondary harnesses attached to the power PCB.
3. Unscrew the four mounting screws fixing the transformer, and remove the transformer from
the case.
4. Place the new transformer inside the case, and mount using the four screws.
5. Connect transformer primary and secondary harnesses to the power PCB.
6. Close the case (section 7.2.8).
7.2.5 Servicing the Heater Plate
Resetting the thermal cutout.
1. Open the case (section 7.2.1).
2. Check the thermal cutout on the heater plate by pushing the red button with a pen or small
screwdriver - see Figure 7.5.
Figure 7.5 Showing location of thermal cutout