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TROUBLESHOOTING & REPAIR
POWER BOARD TEST (continued)
FIGURE F.14 – REMOVING THE FRONT PANEL ASSEMBLY
POWER
PC BOARD
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(Located on Back of Case Front)
QUICK CHECK PROCEDURE
1.Turn off the Invertec STT and disconnect main AC input power to the machine.
2.Using the 5/16" nut driver, remove the case wraparound cover.
3.Locate relays CR1 and CR2 just to the front of the fan motor.
WARNING
ELECTRIC SHOCK can kill.
•With input power ON, there are high voltages inside the machine. Do not reach into the machine or touch any internal part.
4.Apply the correct input power and turn ON the Invertec STT machine.
5.After about a 5 second delay the relays should activate. This can be determined by an audible click which can be heard when the relays are activated. If the relays are being activated, the power PC board is most likely
OK. If the relays are NOT being activated, the power PC board could be faulty. Continue with the voltage tests.
VOLTAGE TEST PROCEDURE
1.Remove input power to the Invertec STT.
2.Perform the Input Filter Capacitor Discharge Procedure. See the Maintenance section.
WARNING
ELECTRIC SHOCK can kill.
• Before continuing with the test procedure, perform the capacitor discharge procedure to avoid electric shock.
3.Using the 5/16" nut driver, loosen the front control panel by removing the four sheet metal screws from the top and bottom of the front panel. Carefully move the front panel assembly to the right to gain access to the power PC board. See Figure F.14.
