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Panel Assembly Service
309738L
55
Replacing the Backlighting
A Backlighting Replacement Kit is available. Order part
no. 118337.
Before replacing the backlighting, check the inverter (9)
for proper voltage by unplugging the backlighting con-
nector (1), turning on the PFlo LT and carefully measur-
ing the AC voltage across the two pins of the inverter.
Voltage should read approximately 700 VAC. If not
replace the inverter.
1.
Shut off system power at the main circuit breaker.
2.
At the control assembly, move the main power
switch to the off position.
3.
Unlock and open the hinged cover of the control
assembly.
4.
Unplug the ribbon cable from the board (4) by slid-
ing it out of the connector. Note the position of the
cable in the connector. The arrow indicates pin #1,
reconnect later with pin #1 engaged.
5.
Unplug the remaining connectors on the board and
note their location. Unplug the connector (1) coming
from the backlighting bulb.
6.
Remove the four screws from the board.
7.
Disconnect the ground wire.
8.
Remove the two small screws holding the backlight-
ing (3) to the display (2), and slide the backlighting
out the side of the display.
9.
Install the parts in reverse order of disassembly
10. Return the control assembly to normal operating
conditions.
WARNING
A qualified electrician must complete all grounding
and wiring connections.
Read Warnings, page 6.
F
IG
. 24
2
3
1
9
4