Thermal Dynamics PAK Master 150XL, Service Manual

Page: 50 / 90

REPLACEMENT PROCEDURES 5-12 Manual 0-2728
10. Carefully remove all wire connections to the FET
PCB Assembly noting the location of each per the
following chart:
Cable #
FET PCB
Connection
14A E14
15A E15
16A E16
19A E19
14B E14
15B E15
16B E16
19B E19
NOTES
Make sure white #19 wires are looped around and
connected from the right side.
Transformer leads are marked 'A' & 'B'. Group
'A' is wired to the top heatsink and group 'B' is
wired to the bottom heatsink. Wires are placed belly
up."
11. Note orientation of Main Transformer Assembly,
then remove four lock nuts securing Transformer
to the center chassis.
12. Install the replacement Transformer Assembly by
reversing the above procedure, keeping in mind
the following:
• Reservoir Panel must seat in corresponding
center chassis slots.
• The four screws securing the output inductor
mounting plate to the center chassis should
have a maximum of 2 to 5 threads protruding
through the left side of the chassis.
L. Pilot Panel Fan (M1 - M4) Replacement
NOTE
There are four Fans mounted to the Pilot Fan Panel.
Replacement instructions are the same for all Fans.
1. Remove Front Panel per Section 5.04-E.
2. Remove the two screws securing the Fan to the
two tabs on the Pilot Fan Panel.
3. Turn the fan sideways and pull gently out of unit
to where the wires can be disconnected.
4. Carefully note wiring connections, then discon-
nect wires.
5. Install replacement Fan(s) by reversing the above
steps, noting the following:
a. Piggyback tabs face outside.
b. Label faces inside unit.
c. Orientate Fan so that Air Flow/Rotation La-
bel molded into the Fan Housing is positioned
as shown in the following illustration.
A-02290
Air Flow/Rotation
Label Direction
Air Flow
Arrow
Direction
Air Flow/Rotation
Label Molded Into
Fan Housing
RO
T A
TION
AIR FLO
W
M. Current Sense PC Board Assembly
Replacement
1. Remove the Work Cable per Section 5.04-C.
2. Disconnect the ribbon cable from the Current Sen-
sor at J17 on the Logic PC Board.
3. Remove the Sensor by prying off standoffs at the
rear of the Bulkhead, behind the Work Cable
Strain Relief.
4. Install the replacement Current Sensor PC Board
by reversing the above procedure.