Precision Control Systems ChamberIR E4 - Manual (Page 16)

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5. Remove the lamp. Inspect the lamp contact points on both ends of the heater for damage.
Replace as needed.
6. Install a new lamp and install the screw removed from the lamp contact in step #2. Tighten both
screws.
7. Make sure the metal contacts of the lamp are in contact with the button contacts of the heater.
8. Install the lamp end covers