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9.2
Power supply PCB
Refer to Figures 9.2.1 and 9.2.2.
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3
Figure 9.2.1: Main chassis component locations.
1: power supply PCB;
2: main PCB;
3: ignition spark generator module;
4: air regulator assembly;
5: fuel needle valve assembly.
1. Ensure that power is disconnected from the instrument. Remove the top rear cover from
the instrument by undoing the two pozidriv screws at the top of the rear panel and lifting
the angled cover from the retaining screws.
2. Identify the power supply PCB mounted on the base of the unit. Note the orientation
and polarization of the two multiway connectors branching from the cableform.
Disconnect these by pulling up on the connector housing; do not pull on the cables.
3. Remove the four wires (two from the solenoid and two from the thermocouple) from the
screw terminal block on the PCB
4. The easiest way to remove the PCB is by undoing the four screws from underneath the
instrument, leaving the pillars screwed to the PCB. The power supply PCB can now be
lifted out of the instrument. Replacement is the reverse of removal.
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PFP7/REV C/01-08
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