2
228-1744 REV 3
080515
KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
http://www.kepcopower.com
email: [email protected]
3.2 COVER REMOVAL PROCEDURE
WARNING: Before installing the kit, unplug the BOP from a-c input source and disconnect the output
load!
1.
Turn power off and disconnect the unit from source power and remove line cord, then disconnect the output
load.
NOTE: Retain all hardware for reassembly.
2.
Remove the two mounting ears from the chassis by removing three screws from each.
CAUTION: The two screws at the top of the front panel must be removed first to avoid damage to the
front panel.
3.
Remove the top cover of the unit by removing 14 screws as follows: two at top of the front panel, four at each
side, (one towards the rear, three at the bottom) and four at the top of the rear panel.
3.3 PRINTED CIRCUIT BOARD AND HEAT SINK INSTALLATION PROCEDURE
The Transition Circuit Assembly (A7A3) is shipped with Printed Circuit Board (PCB) assembled to the Heatsink
with the preload-MOSFET mounted directly on the heatsink (Figure 1).
FIGURE 1. TRANSITION CIRCUIT ASSEMBLY, COMPONENT LOCATIONS
1.
Attach the adapter plate provided in this kit to the Transition Circuit assembly heat sink using two flat head
screws (P/N 101-0332) provided in this kit.
2.
Install the Transition Circuit assembly as shown in Figure 2 by sliding the adapter plate under the fan and
using the two screws provided in this kit at the ventilation holes identified in the figure. The screws are inserted
up through the bottom of the chassis into the adapter plate.
CAUTION: When routing cables, ensure that the cables stay clear of the Output Module (A2) Fan and
Auxiliary Power Supply (A5).
3.
Cable assembly P/N 118-1267 (provided in the Kit) has a 3-pin connector with two wires, each having non-iso-
lated ring lugs. Remove the screws and lockwashers from J4M and J2M on A4A8, then add the wires from the
cable assembly to the wires already connected to J4M and J2M as follows (see Figure 2 for the location of
A4A8 in the chassis, Figure 3 for location of J4M and J2M and Figure 6 for cable routing):
• red/white wire to A4A8- J4M
• black/white wire to A4A8- J2M
!
R28
C12
Q6
1
2
Q2
!
