SVC 6-4
Remove/Replace Inlet, Detector, and Valve Box Heater/Sensor Cable
Assemblies
Replacement of a heater/sensor cable assembly (which consists of the heater and sensor cartridges, as
well as the wiring connecting them to the main PCB) is accomplished by partial removal of the applica-
ble heated zone component. In addition, the heater/sensor cable assembly must be disconnected from
the applicable connectors on the main PCB. Removal of the wiring from the connectors on the main
PCB is covered first, followed by instructions for removal of the heater and sensor cartridges from the
heated zone components.
Disconnect/Connect Heater and Temperature Sensor Wiring on Main PCB
HAZARDOUS VOLTAGES ARE PRESENT IN THE INSTRUMENT WHEN THE POWER
CORD IS CONNECTED. AVOID A POTENTIALLY DANGEROUS SHOCK HAZARD BY
DISCONNECTING THE POWER CORD BEFORE WORKING ON THE INSTRUMENT.
1. Set the main power line switch to the off position.
2. Disconnect the power cable from its receptacle.
3. Turn off all gas supplies.
4. Remove the four screws securing the rear
cover to the instrument.
5. Slide the rear cover towards the rear of the
instrument.
This procedure requires precautions against ESD (Electro-Static Discharge). Use a
groundedwrist strap (part no. 9300-0969 - large, or9300-0970 - small) connected
to a suitable ground. Failure to heed this caution may result in damage to the
instrument.
OFF ON
RED O VISIBLE
SCREWS
SCREWS
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