Chapter 7: Repair Procedures
Power Supply
Service Manual 7-59
1. To verify the power supply outputs are correct, measure the following voltages on one of the unused
connectors that feed power to the option boards. The voltages are not adjustable. If they are out of
specification, the power supply must be replaced.
7.17.1 Toroidal Transformer
To replace the elevating base toroidal transformer:
1. Disconnect the wire harnesses connected to the relay board and remove the board.
2. Using an 1/2” open end wrench loosen transformer retaining bolt.
3. Remove both the toroidal transformer and the retaining bolt. Save the bolt for installing the
replacement transformer.
4. Disconnect the old transformer from its wire harness.
5. The replacement toroidal transformer comes with two 4” diameter rubber insulating washers that are
installed on both sides of the transformer like a sandwich, and a 4” diameter metal mounting washer
that is installed on the same side of the transformer as the head of the retaining bolt. To make aligning
these parts easier during installation, you may wish to use electrical tape to attach the 3 large washers
to the transformer.
6. Install the new transformer by passing the retaining bolt through the washers and transformer and into
the threaded hole in the side of the electrical enclosure. Turn the transformer so you can see the label
on the side transformer to orient the wire harness so it exits toward you, then finish tightening the
retaining bolt.
7. Connect the transformer wire harness.
8. Reinstall the relay board and reconnect its wire harnesses.
7.17.2 Canopy Lift Motor, ISO Transformer, Circuit Breakers, Power Switches, and Power
Outlets
The canopy lift motor, ISO transformer, circuit breakers, power switches and power outlets can all be more
easily accessed by removing the connection panel at the bottom of the enclosure by removing the 3 screws
that secure it with a 2.5 mm hex key.
Signal Measure at Acceptable Range
5 Volts Pins 2 to 1 (Blue/Orange) 4.75 volts to 5.25 volts
12 volts Pins 3 to 1 (Red/Orange) 10.80 volts to 13.20 volt
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