IDEALARC DC-600
F-31
TROUBLESHOOTING & REPAIR
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 VOLTAGES
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.
b.
If the open circuit voltage is not
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
4.
Test for open circuit voltage at the
Control Board
a. Insert meter probes in to Plug
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.
FIGURE F.11 - LED 2 Open Circuit Voltage Test Points
CONTROL BOARD TEST