Lincoln Electric IDEALARC SP-255 Service Manual page 97

F-44
CAPACITOR BANK REMOVAL AND REPLACEMENT
PROCEDURE
See Figure F.18 for location of Capacitor
Bank Removal and Replacement compo-
nents.
FIGURE F.18 - Location of Capacitor
Bank Removal and Replacement
Components
1. Disconnect main input power to the
machine.
2. Test that the capacitors are dis-
charged using a volt ohmmeter. Po-
larity must be observed.
3. Remove the two transformer second-
ary leads (X2 and X3) for the nega-
tive capacitor bank buss bar using
two 1/2" open end wrenches.
4. Remove the output choke lead and
the heavy lead extending from the
SCR Rectifier Assembly to the posi-
tive capacitor bank buss bar using a
1/2" (13 mm) open end wrench.
5. Remove lead #206 and the D1 diode
lead from the negative capacitor
bank buss bar using a slot head
screwdriver and 3/8" open end
wrench.
TROUBLESHOOTING & REPAIR
IDEALARC
6. Remove the #204 lead from the pos-
itive buss bar.
7. Remove the shunt from the negative
capacitor bank buss bar using a 1/2"
socket wrench with a universal tool
adapter.
a. Two people may be required to
remove the shunt. One person
may have to reach through from
the left side of the machine to
keep the bolt in position while
the other person loosens the nut.
8. Remove the two screws holding the
capacitor bank to the floor of the ma-
chine using a 5/16" nut driver.
9. Clear the leads and carefully remove
the capacitor bank assembly from
the machine.
® SP-255
F-44