6.Clip one small cable tie (2.5 mm wide) around the heater plate harnesses near the heater plate, securing all wires as they protrude through the top case. Place a second cable tie near the thermistor connectors to secure the thermistor wires as they enter the connector (refer to Figure 6.7 for cable tie location).

7.Install the heater plate back into the case top (§ 6.5.7).

8.Reassemble the PCB and the case (§ 6.8).

6.5.5REPLACING THE THERMAL CUT-OUT

NOTE: a replacement thermal cut out will be required (part no 349 040 051).

1.Open the case and remove the PCB (refer to § 6.2).

2.Remove the heater plate (refer to § 6.5.2). Refer to Figure 8.2 for the exploded diagram.

3.Cut the cable ties attached to the heater plate harness.

4.Unsolder the two wires attached to the thermal cut-out (Figure 6.8).

5.Remove the two screws holding the heater plate thermal cut-out.

6.Place the new thermal cut-out and screw it down.

7.Solder the wires back onto the thermal cut-out.

8.Ensure the thermal cut out has not been tripped by pressing the red reset button.

9.Clip three small cable ties (2.5 mm wide) around the heater plate harnesses. Place one close to the

heater plate, securing all wires as they protrude through the top case. Place another halfway up the

wires securing the heater plate harness and protective earth wire (leave the thermistor wires free for 6 flexibility in connecting to the PCB). The last tie secures the heater plate harness wires near the Molex

plug (this tie may not need to be cut to replace the cut out). Refer to Figure 6.7 for cable tie locations.

10.Install the heater plate back into the case top (refer to § 6.5.7).

11.Reassemble the PCB and the case (refer to § 6.8).

Heater plate springs

Backing plate (heater plate element underneath)

Main Thermistor &

Backup Thermistor

Thermal

Protective earth

connection

cutout

 

Figure 6.8: Heater plate components

MR810 Technical Manual Revision C REF 185042601

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