Lincoln Electric IDEALARC CV-305 - Manual (Page 74)

OUTPUT RECTIFIER BRIDGE REMOVAL & REPLACEMENT
(CONTINUED)
TROUBLESHOOTING & REPAIR F-42 F-42
IDEALARC® CV-305
PROCEDURE
1. Disconnect main AC input power to the machine.
2. Remove the Case Roof and Case Sides.
3. Test that the capacitors are discharged using a
D.C. voltmeter.
a. Polarity must be observed.
4. Remove the Capacitor Bank Assembly. See the
Capacitor Bank Replacement Procedure.
5. Disconnect the three transformer secondary leads
connected to the three SCR heat sinks using a 1/2"
open wrench.
a. Disconnect leads #221, #222, and #223.
b. Note placement of leads and hardware for re-
assembly.
6. Remove plug J1 from the control board.
7. Cut any cable ties that would restrict the removal of
the assembly.
8. Disconnect the three #204 leads connected to the
bottom of the positive SCR heat sink using a 7/16"
open end wrench.
9. Remove the four mounting screws that fasten the
Rectifier Assembly to the lift bail assembly.
a. Note the placement and arrangement of the
insulating materials on the mounting screws
for re-assembly. See Figure F.15.
10. Remove the rectifier bridge assembly carefully
from the machine.
a. Clear or cut any cable ties or leads that may
hamper the removal of the assembly.
NOTE: If further disassembly is required, see
SCR
Removal and Replacement Procedure and
Diode Mounting Instruction.
Insulators
Heat Sink
Mounting
Bracket
FIGURE F.15 - RECTIFIER INSULATION
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