Led 2 Open Circuit Voltage Test Points - Lincoln Electric Idealarc DC600 9773MSP Service Manual

TROUBLESHOOTING & REPAIR
CONTROL BOARD TEST
If LED 2 Does Not Light When
Machine is Operating Under Load (or
terminals #2 and #4 are jumpered
together on the terminal strip).
1. Test for the following open circuit
voltages at the Weld Output
Terminals
• 15 - 58 VDC when the WELDING
MODE SWITCH is in either of the
CV positions
• 75 VDC when the WELDING
MODE SWITCH is in the VV(CC)
position.
NOTE: BE SURE TO OBSERVE
POLARITY. DC
BEING TESTED.
2. Touch the negative (-) meter probe
to the negative (-) Weld Output
Terminal and positive (+) meter
probe to the positive (+) Weld
Output Terminal.
3. Read meter.
a. If the open circuit voltage is
present at the Weld Output
Terminals, then test for open
circuit voltage the Control
Board.
FIGURE F.11 - LED 2 Open Circuit Voltage Test Points
b. If the open circuit voltage is not
4. Test for open circuit voltage at the
VOLTAGES
Control Board
a. Insert meter probes in to Plug
present at the Weld Output
Terminals, then
• Check the Output Choke and
associated heavy current car-
rying leads for loose or faulty
connections.
• Perform the Main
Transformer Test
• Perform the Firing Board Test
• Perform the SCR Output
Bridge Test
lead cavities to test for open
circuit voltage from lead #222
at Plug J1 on the Control Board
to lead #215 at Plug J3 on
Control Board. See Figure
F.11.
IDEALARC DC-600
F-31