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F-14
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued)
WARNING
ELECTRIC SHOCK
• Have an electrician install and service
this equipment.
• Turn the input power off at the fuse box
before working on equipment.
• Do not touch electrically hot parts.
• Prior to performing preventative maintenance,
perform the following capacitor discharge procedure
to avoid electric shock.
DISCHARGE PROCEDURE
1. Remove the input power to the POWER WAVE
355M/405M.
2. Using the 5/16" wrench remove the screws from
the case wraparound cover.
3. Be careful not to make contact with the capacitor
terminals located at the top and bottom of the
switch board.
FIGURE F.1 – LOCATION OF INPUT FILTER CAPACITOR TERMINALS
TROUBLESHOOTING AND REPAIR
can kill.
EIGHT
CAPACITOR
TERMINALS
-
-
+
+
-
-
+
+
POWER
RESISTOR
POWER WAVE
4. Obtain a high resistance and high wattage resistor
(25-1000 ohms and 25 watts minimum).
resistor is not with the machine. NEVER USE A
SHORTING STRAP FOR THIS PROCEDURE.
5. Locate the eight capacitor terminals shown in fig-
ure F.1.
6. Using electrically insulated gloves and pliers, hold
the body of the resistor with the pliers and connect
the resistor leads across the two capacitor termi-
nals. Hold the resistor in place for 10 seconds.
DO NOT TOUCH CAPACITOR TERMINALS WITH
YOUR BARE HANDS.
7. Repeat the discharge procedure for the other three
capacitors.
®
8. Check the voltage across the terminals of all
capacitors with a DC voltmeter. Polarity of the
capacitor terminals is marked on the PC board
above the terminals. Voltage should be zero. If
any voltage remains, repeat this capacitor dis-
charge procedure.
-
-
+
+
-
-
+
+
INSULATED
®
355M/405M
INSULATED
PLIERS
GLOVES
F-14
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