Troubleshooting & repair, Procedure – Lincoln Electric IDEALARC CV-300 User Manual
Page 73
F-34
TROUBLESHOOTING & REPAIR
F-34
IDEALARC CV-300
PROCEDURE
1.
Disconnect main AC input power to
the machine.
2.
Remove the Case Roof and Case
Sides.
3.
Test the capacitors are discharged
using a voltmeter.
a.
Polarity must be observed.
4.
Remove the Capacitor Bank
Assembly
a.
Use the steps given in the
Capacitor Bank Assembly
Removal Procedure in this sec-
tion of the manual.
5.
Disconnect the three transformer
secondary leads connected to the
three SCR heat sinks using a 1/2"
open wrench. See Figure F. 18.
a.
Disconnect leads #221, #222,
and #223.
b.
Note placement of leads 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 pos-
itive SCR heat sink using a 7/16"
open end wrench. See Figure F.18.
9.
Remove the four mounting screws
that fasten the rectifier assembly to
the lift bail assembly.
a.
Note the placement of the
arrangement of the insulating
materials on the mounting
screws for re-assembly. See
Figure F.19.
10. Remove the rectifier bridge assem-
bly carefully from the machine.
a.
Clear or cut any cable ties or
leads that may hamper the
removal of the assembly.
FIGURE F.18 - Output Rectifier Bridge
Assembly removal.
FIGURE F.19 - Mounting screw insu-
lating material arrangement.
NOTE: If further disassembly is
required, see
Replacement Procedure and Diode
Mounting Instruction.
OUTPUT RECTIFIER BRIDGE REMOVAL & REPLACEMENT (CONTINUED)
TRANSFORMER
SECONDARY
LEADS
INSULATION