Service manual

PN 4237242C
4.12-2
SERVICE AND REPAIR PROCEDURES
+24 VOLT SWITCHING POWER SUPPLY
6. Disconnect the output and signal wires (Figure 4.12-1). The new part should include a
harness with this wiring attached.
a. If the harness is included, open up the lower chassis to gain access to the front of
the Motor/Solenoid Driver card and disconnect P15. Some wire wraps may also have
to be cut to release the harness.
b. If the harness is not included, disconnect the wires going to the four-position
terminal strip and remove the four-pin connector beside the terminal strip.
1) Disconnect the three red wires, two from the Motor/Solenoid Driver card and
one from the (+S) on the four-wire connector from the two (+) terminals.
2) Disconnect the three black wires, two from the Motor/Solenoid Driver card and
one from the (-S) on the four-wire connector from the two (RTN) terminals.
7. Remove the power supply. The power supply is held on with four, #2 Phillips-head
screws accessed from the backside of the rear panel.
Installation
1. Attach the new +24 V power supply to the rear panel using the four Phillips-head screws.
2. Connect the three ac input wires that are attached to a three-position terminal strip
(Figure 4.12-1):
r The brown line (hot wire) connects to ACL.
r The blue return line connects to ACN.
r The green/yellow stripe wire connects to ground.
3. If the output wiring harness has been provided with the supply, open the lower chassis to
gain access to the front of the Motor/Solenoid Driver card and connect P15 to J15.
4. If the output wiring harness has not been provided, connect the four-position plug. It
only goes on one way and has the power ON/OFF, powerfail (PF/PG), and output sense
lines.
5. Connect the output lines to the four-position terminal strip (Figure 4.12-1):
a. Connect the three red wires, two from the Motor/Solenoid Driver card and one from
the (+S) on the four-wire connector to the two (+) terminals.
b. Connect the three black wires, two from the Motor/Solenoid Driver card and one
from the (-S) on the four-wire connector to the two (RTN) terminals.
6. Close the rear panel.
7. Reconnect the ac power cable.