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F-29
TROUBLESHOOTING & REPAIR
F-29
POWER-ARC 4000
1. Remove the engine spark plug wire.
2. With the 5/16” nut driver, remove
the sheet metal screws that hold the
top cover to the control box.
Remove the top cover.
3. With the 5/16” nut driver and wrench
remove the screws that hold the
control panel in place. Move the
panel aside as far as the leads will
allow.
4. Discharge the field capacitor by
connecting the jumper wire clips on
the black and the red wire terminals
on the top of the capacitor. See
Figure F.8 for location. Leave the
clips on for at least 5 seconds, then
remove.
5. The field diode bridge is mounted to
the sheet metal just above the
capacitor. See Figure F.8A.
Remove it using the slot head screw
driver.
6. With the needle nose pliers, gently
remove the wires from the diode
bridge.
7. Replace the wires to their appropri-
ate locations on the new diode
bridge:
Lead 200 attached to the positive (+)
terminal. Depending on the bridge
used, this corner may be beveled
and/or marked with a + sign.
Lead 201 and 201B are piggy-backed
on the negative (–) terminal, which will
always be located diagonally across
from the positive (+) terminal.
Leads 9A and 7A are attached to the
AC side of the bridge and are attached
to the other two corner terminals.
Either lead can go on either terminal.
8. Mount the field diode bridge using
the screw. Use the slot head screw-
driver.
9. Check that the leads are not
grounded and for clearance and
tightness.
10. Replace the control panel and
tighten the sheet metal screws
with the 5/16” nut driver and 5/16”
wrench.
11. Replace the top cover of the con-
trol box and tighten the sheet
metal screws with the 5/16” nut
driver.
CAPACITOR AND/OR DIODE BRIDGE REMOVAL AND REPLACEMENT
(continued)
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FIGURE F.8A - FIELD DIODE BRIDGE LOCATION
Feild Diode Bridge
7A
Field Diode Bridge
201 (Black)
201B (Black)
9A
200 (Red)
+
–
PROCEDURE - FIELD DIODE BRIDGE REMOVAL AND REPLACEMENT