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TROUBLESHOOTING AND REPAIR |
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued)
FIGURE F.1 — CAPACITOR DISCHARGE PROCEDURE.
SWITCH
BOARD
CAPACITOR
TERMINALS
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TEST PROCEDURE
1.Remove input power to the Power Wave 455.
2.Using the 3/8 in. nutdriver, remove the left and right case sides.
3.Be careful not to make contact with the capacitor terminals that are located in the bottom center of the left and right side switch boards. See Figure F.1.
4.Carefully check for a DC voltage at the capacitor terminals on both boards. Note the polarity is marked on the PC board and also lead #19 is positive.
5.If any voltage is present, proceed to Step #6. If no voltage is present, the capacitors are discharged.
6.Using the high wattage resistor (25- 1000 ohms @ 25 watts (minimum), electrically insulated gloves and pliers, connect the resistor across the two capacitor terminals. Hold the resistor in place for 10 seconds. DO NOT TOUCH THE CAPACITOR TERMI- NALS WITH YOUR BARE HANDS.
NEVER USE A SHORTING STRAP FOR THIS PROCEDURE.
7.Repeat procedure for the other capacitor.
8.Recheck the voltage across the capaci- tor terminals. The voltage should be zero. If any voltage remains, repeat the discharge procedure.
NOTE: Voltage present after the discharge has been performed is an abnormal condi- tion and may indicate a switch board problem.
