Lincoln Electric 11519 Service Manual page 96

F-50
CAPACITOR BANK REMOVAL AND REPLACEMENT (continued)
FIGURE F.16 — LOCATION OF CAPACITOR BANK REMOVAL AND REPLACEMENT COMPONENTS
SCR DIODE
LEAD
SHUNT
PROCEDURE
1. Disconnect main input power to the machine.
2. Remove the case side panels using a 3/8 in.
nutdriver.
3. Test that the capacitors are discharged using a
volt ohmmeter. Polarity must be observed.
4. Remove the two transformer secondary leads
X2 and X3 (braided copper strap) from the
negative capacitor bank buss bar using two 1/2
in. open end wrenches.
5. Remove the shunt, leads 206, 206B, and the
SCR diode lead from the negative capacitor
bank buss bar using a 1/2 in. open end wrench.
6. Remove the choke lead and lead 204B from
the positive capacitor bank buss bar using two
1/2 in. open end wrenches.
TROUBLESHOOTING AND REPAIR
LEAD
#206
LEAD
#206B
LEADS
X1 AND X2
Power MIG® 255XT
POWER
ENHANCEMENT
CHOKE LEAD
OUTPUT
CHOKE LEAD
7. Remove the power factor enhancement choke
lead from the positive capacitor buss bar using
two 1/2 in. open end wrenches.
8. Remove the three nuts holding the capacitor
bank to the floor of the machine using a 3/8 in.
nut driver.
9. Clear the leads and carefully remove the
capacitor bank assembly from the machine.
10. Reassemble the capacitor bank in the reverse
order.
F-50
CAPACITOR
BANK