Replace The User Interface - Wallmaster - Friedrich Kuhl KCS12B10A Service Manual

Replace the User Interface - Wallmaster

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.
1. Unplug the Unit
2. Remove the Front Cover.
Figure 403.
3. Slide the unit out approximately 3 inches from the sleeve.
Refer to figure 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.
User Interface
3 ea Control
panel screws
2 ea User
Interface screws
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.
76
COMPONENT TESTING
Refer to Routine Maintenance,
Control Panel
Figure 718
4 ea
Circuit
Board
Pins
Circuit
Board
Depress black Tabs
Figure 719