Lincoln Electric IDEALARC CV-300 Service Manual page 58

F-19
ACTIVE SCR RECTIFIER ASSEMBLY TEST (CONTINUED)
TEST PROCEDURE
1. Disconnect main AC input power to
the machine.
2. Locate and remove the following
plugs:
PLUG #
J5
J1
J3
See Figure F.11.
CONTROL
BOARD
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.
F.12.
TROUBLESHOOTING & REPAIR
LOCATION
Snubber board
Control board
Control Board
SNUBBER
FIGURE F.12 - Procedure to discon-
BOARD
nect the strap from the positive heat
sink to the capacitor bank.
5. Disconnect the D5 diode pigtail from
See Figure
FIGURE F.13 - Procedure to discon-
nect the D5 diode pigtail from the
negative capacitor buss.
IDEALARC CV-300
the negative capacitor buss using a
1/2" wrench. See Figure F.13.
F-19