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F-24
TROUBLESHOOTING AND REPAIR
F-24
POWER WAVE 455/POWER FEED 10
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.
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.
FIGURE F.1 — CAPACITOR DISCHARGE PROCEDURE.
CAPACITOR
TERMINALS
SWITCH
BOARD
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE
(continued)
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