6.3.4
Low Voltage
Transformer
Chapter 6 - Detailed Diagnostics
continued
The compressor is screwed to the base plate on rubber feet in the back portion of the Generator. It runs on line
voltage supplied through the fusing and distribution module. When the front panel switch is turned on, the cooling
fins on the compressor quickly become hot and the compressor vibrates; this is normal and is not cause for
replacement. For a functional description see section 2.2.
With power on, remove the Hand Piece air connector. A steady flow of air should be detectable. If available, a
pressure gauge can be used to measure the air pressure, which should be greater than or equal to 4.5 pounds per
square inch. Reconnect the hand piece air connection or plug.
If power is available to the compressor and there is no or reduced air flow, check the hose leading from the
compressor for any perforations or restrictions. Also check the plastic filter housing and filter, located on the side
of the compressor, for any blockage before replacing the compressor (models HP050, HP051, H1TUV, HPTUV).
NOTE: The compressor filter, located in the plastic housing, should be removed and cleaned at least once every
two years. To remove the filter, unscrew the wing nut securing the plastic housing to the compressor.
Replacement:
1.
Disconnect the line cord and unscrew the four phillips head machine screws from the base plate.
2.
Disconnect the two primary wires from the fusing module and remove the grounding wire from the
base plate.
3.
With pliers, unscrew the hose fitting. Remove the compressor and replace with the appropriate part listed
in Appendix C.
The low voltage transformer is screwed to the left side of the base plate underneath the generator PCB and receives
line voltage from the fusing and distribution module. For a functional description see section 2.2.
The output of this transformer terminates at J1 on the generator PCB. Proceed through the following steps to test
for the proper output voltage:
1.
Remove the power cord. Remove the plug at J1 and clip the digital voltmeter to
locations 3 (white wire) and 4 (green wire).
NOTE: Location 1 is next to the filled keying location.
Warning: Stay clear of locations 7 and 8; they are high voltage (250 to 260 VAC).
2.
Supply power and turn the front panel switch on. With nominal line voltage, the open
circuit voltage between locations 3 and 4 should be between 33 and 35 volts AC.
3.
Repeat this process and verify the voltage between locations 2 (yellow wire) and
4 (green wire) is between 16 and 17 volts AC.
4.
Repeat this process and verify the voltage between locations 5 (red wire) and
6 (black wire) is between 9.5 and 10.5 volts AC.
5.
Remove the power cord and replace the J1 plug.
If power is available to the transformer and there is no output voltage, remove the line cord, refer to the wiring
diagram (Appendix B), and inspect the wiring leading to the transformer. If the wiring appears intact, replace the
transformer.
20
6.3.3
Compressor
