This illustration shows only the fuses and connections that affect the Drawer Heater.

Problem	Required Action
Heater does not warm up.	Test fuses at chair base.
	Test drawer heater switch. Refer to: Drawer Heater Switch Test below
	Test drawer heater. Refer to: Drawer Heater Plate Test below
	Check output voltage from isolation transformer. Refer to: Isolation Transformer Test below

1.Remove receptacle cover.

2.Remove two screws and place receptacle aside.

3.Disconnect the white wires from heater switch to the heater plate.

4.Plug in power cord.

5.Set meter to 200 VAC.

6.Depress switch On.

7.Place meter probes on two white wires from drawer heater switch.

Meter Reading	Required Action
0 VAC	Replace switch.
approximately 115 VAC	Switch - OK Refer to: Drawer Heater Plate Test below

8.Re-connect electrical leads.

1.Remove receptacle cover.

2.Remove two screws and place receptacle aside.

3.Disconnect the white wires from heater switch to the heater plate.

4.Set meter to Ω.

5.Place meter probes on two white wires from heater plate.

Meter Reading	Required Action
0 Ohms	Replace Heater Plate
538 Ohms +/- 10%	Heater Plate Ok

6.Re-connect electrical leads.

1.Remove receptacle cover.

2.Remove two screws and place receptacle aside.

3.Disconnect the black and red wires from isolation transformer to heater switch.

4.Plug in power cord.

5.Set meter to VAC.

6.Place meter probes on the black and red wires from isolation transformer.

Meter Reading	Required Action
0 VAC	Replace Transformer
approximately 115 VAC	Transformer OK. Refer to: Drawer Heater Switch Test above

7.Re-connect electrical leads.