22 • Service Manual — COATS Models 950/950 ProRacer/1025/1050/1055
Direct Drive
Transformer
1.
Unplug the balancer.
2.
Remove weight tray and weight tray shield.
3.
Remove the two (2) 8-32 x 1/2 screws and remove
the transformer from the Power Panel.
4.
Record wire color and corresponding transformer
terminal numbers.
5.
Disconnect wiring to transformer.
6.
Connect wiring to transformer.
Transformer wiring must be transferred to
new transformer exactly as connected previ-
ously. Failure to perform this important step
properly may result in damage to trans-
former, balancer wiring, or printed circuit
board. (See Wiring Diagram ).
7.
Install new transformer to Power Panel.
8.
Install weight tray and weight tray shield and plug
in balancer
9.
Perform the FUNCTIONAL CHECKS.
Contactor
1.
Unplug the balancer.
2.
Remove weight tray and weight tray shield.
3.
Loosen the power cable clamp on the back of the chas-
sis and push one or two feet of cable into the chassis.
4.
Remove three (3) 6-32 x 1/2 screws holding power
panel to chassis and set power panel on top of bracket
in center of balancer to facilitate wire removal.
5.
Record the wire numbers and the corresponding
contactor terminal location.
6.
Disconnect wires at contactor.
7.
Loosen two (2) 8-32 x 3/4 screws holding contac-
tor and slide out contactor.
8.
Install new contactor and connect wiring.
Contactor wiring must be transferred to new
contactor exactly as connected previously.
Failure to perform this important step can
result in damage to contactor, drive motor,
balancer wiring and printed circuit board.
(See Wiring Diagram).
Note: For ease of installation, the motor wires
are numbered corresponding to the motor ter-
minal numbers on the wiring diagram.
9.
Install Power Panel.
10.
Pull power cable out of chassis and tighten power
cable clamp.
11.
Install weight tray and weight tray shield and plug
in balancer.
12.
Perform the FUNCTIONAL CHECKS.
Auxiliary Contactor Block
1.
Perform steps 1 through 4 of Contactor
Replacement Procedure.
2.
Disconnect wiring from auxiliary contact block.
3.
Lift the white lever that is on the top of the contac-
tor block and slide the contactor block off the contactor.
4.
Install new contactor block and connect wiring.
Follow the same precautions as outlined in
step 8 of the CONTACTOR REPLACEMENT
PROCEDURE.
5.
Perform steps 9 through 12 of CONTACTOR
REPLACEMENT PROCEDURE.
Bridge Rectifiers
Note: See checking procedure on page 23.
1.
Unplug the balancer.
2.
Remove weight tray and weight tray shield.
3.
Identify and record wire locations.
4.
Disconnect wiring from bridge rectifier.
5.
Remove the 8-32 x 3/4 screw holding the bridge
rectifier to the power panel.
6.
Place a small amount of thermal grease on back of
the bridge rectifier and install the new bridge rectifier.
7.
Connect wiring.
The wires must be transferred to new bridge
rectifier exactly as connected previously.
8.
Plug in the balancer.
9.
Check bridge rectifier as outlined in TROU-
BLESHOOTING SECTION.
10.
Install weight tray and weight tray shield.
11.
Perform the FUNCTIONAL CHECKS.
CAUTION
CAUTION
CAUTION
CAUTION
