Troubleshooting & repair, Test procedure, Active scr rectifier assembly test (continued) – Lincoln Electric IDEALARC CV-300 User Manual
Page 58
F-19
TROUBLESHOOTING & REPAIR
F-19
IDEALARC CV-300
TEST PROCEDURE
1.
Disconnect main AC input power to
the machine.
2.
Locate and remove the following
plugs:
See Figure F.11.
FIGURE F.11 - Molex plug locations.
3.
Locate resistor R1 and remove lead
#224. See wiring diagram.
4.
Disconnect the strap from the posi-
tive heat sink to the capacitor bank
using a 1/2" wrench. See Figure
F.12.
FIGURE F.12 - Procedure to discon-
nect the strap from the positive heat
sink to the capacitor bank.
5.
Disconnect the D5 diode pigtail from
the negative capacitor buss using a
1/2" wrench. See Figure F.13.
FIGURE F.13 - Procedure to discon-
nect the D5 diode pigtail from the
negative capacitor buss.
ACTIVE SCR RECTIFIER ASSEMBLY TEST (CONTINUED)
CONTROL
BOARD
SNUBBER
BOARD
PLUG #
J5
J1
J3
LOCATION
Snubber board
Control board
Control Board