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Figure 9.2.2: Power supply PCB
9.3
Main PCB replacement
Refer to Figures 9.2.1, 9.3.1 and 9.3.2.
1. Ensure that power, fuel and air supplies to the instrument are disconnected.
2. Remove the knob from the front panel d.p., blank, fine and coarse controls by loosening
the two grub screws in each. Remove the nuts securing the d.p. and coarse switches to
the front panel.
3. Remove the top rear cover as described in Section 9.2 step 1. Disconnect the three
connectors from the back of the main PCB by pulling on the housing box (do not pull on
the cables). Note the orientation and polarization of each.
4. Remove the two thumb-screws, one in the top right hand corner and the other in the top
left hand corner.
5. The PCB may be removed by tipping it back, releasing the front panel switch bosses
from their mounting holes and lifting the PCB back and up through the rear top cover.
Take care not to loose or disturb the washers on the switches. Replacement is the
reverse of removal.
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PFP7/REV C/01-08
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