76 PB
COMPONENT TESTING
Replace the User Interface - Wallmaster
1. Unplug the Unit
2. Remove the Front Cover. Refer to Routine Maintenance,
Figure 403.
3. Slide the unit out approximately 3 inches from the sleeve.
Refer to gure 506 for chassis removal.
4. Using a sharp knife, cut slits in the Chassis gasket seal
where the control board panel will be opened to avoid
damaging the gasket.
5. Remove two (2) screws from the top, and one (1) from the
front of the control board panel and open panel.
6. Remove two (2) mounting screws securing UI and
disconnect ribbon cable.
Figure 718
7. Carefully depress 2 black tabs by squeezing towards the
bottom of the interface you. Refer to Figure 718. Inspect ribbon
cable for obvious signs of damage.
8. If ribbon cable is damaged, or damage is suspected,
disconnect cable from User Interface and Control Board.
9. Paying careful attention to the ribbon cable routing, remove
the old cable and replace with a new ribbon cable.
10. Connect ribbon cable to the power board and user
interface as required.
11. Install new UI using the 2 screws.
12. Install the 3 Control Panel Screws.
13. Plug in the unit and verify control operation. Refer to
Operation Section.
Figure 719
User Interface
3 ea Control
panel screws
2 ea User
Interface screws
Control Panel
4 ea
Circuit
Board
Pins
Circuit
Board
Depress black Tabs
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
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