Replacing The Ac Drive Module - Cardiac Science ST 55 Service Manual

Repair/Replacement and Calibration

Replacing the AC Drive Module

The AC Drive Module with treadmill drive board must be replaced as a unit.
Remove the treadmill hood and power as described in
1.
page 5-4.
WARNING! Electric shock hazard.
To prevent high voltage electrical shock: Before working on or around any electrical or
mechanical component under the hood, wait at least two minutes from the time you unplug
the power cord and be sure the red LEDs on the drive board on the AC Drive Module are off.
Disconnect the stress monitor cable from the AC Drive Module.
2.
For TM models only: remove the four Phillips screws holding the Digital Interface
3.
Board (see the figure on the next page). Carefully set board aside.
Note: In the following steps, note the connection points and the colors of the wires as
you remove them from the drive module. All the wires are harnessed. Cut the plastic ties
to free the wires as necessary. Reference wiring schematic.
Unplug the grade motor wires from the drive board on the AC Drive Module.
4.
Unplug the isolation transformer wires.
5.
Unplug the non-isolation transformer wires.
6.
Unplug the grade potentiometer wires. Clip the plastic ties around the cage only, not
7.
around the headframe.
Unplug the limit switch wires.
8.
Unplug the power resistor wires.
9.
Unplug the drive motor wires.
10.
Unplug the configuration plate wires.
11.
70-00298-01 A
5-8
Removing the Treadmill Hood
TM 55/65 Treadmill 4.0
on