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TROUBLESHOOTING AND REPAIR | ||
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DIODE BRIDGE TEST
(continued)
FIGURE F.4 – CONTACTOR
552B
+ 
552A - 
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41
58042
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TEST PROCEDURE
1.Remove the input power from the unit.
2.Using a 5/16 nut driver remove the 5 screws holding the cover.
3.Apply the correct input voltage (42VAC) to the LF72/LF74 unit.
4.Check for the correct input voltage at leads 41 and 42 on the bridge. If the input voltage is not there check the wiring back to the receptacle assembly pins I and K.
5.Check for the proper output on leads 580 negative and 522 positive. The voltage should be 59VDC. If you are only reading 38VDC the control circuit is open. Check the wiring and the connections back to your control board.
