Cebora Power Tig 1540 DC-HF Service Manual page 10

CEBORA S.p.A.
SIGNALING TEST.
Upon start-up, after the lamp-test, pressing button (A) several times the "Process" and
"Mode" selection is repeated in sequence, indicated by leds F, E, D, C and B that lit in
sequence.
♦ Check the wiring between the CN2 power board (29) and CN2 panel board (26).
♦ Replace panel (26) and/or power (29) boards.
POTENTIOMETER ADJUSTING TEST.
Power board (29), connector CN2, terminals 10(+) and 2(-) = 0 – +5 Vdc, turning the
potentiometer H (current) on panel board (26).
Power board (29), connector CN2, terminals 11(+) and 2(-) = 0 – +5 Vdc, turning the
potentiometer M (slope) on panel board (26).
Power board (29), connector CN2, terminals 12(+) and 2(-) = 0 – +5 Vdc, turning the
potentiometer L (post-gas) on panel board (26).
♦ Check the wiring between the CN2 power board (29) and CN2 panel board (26).
♦ Make sure voltage +5 Vdc on terminals 1(+) and 2(-) of CN2 on panel board (26)
(potentiometer power supply). If missing, make sure the same voltage on
terminals 1(+) and 2(-) of CN2 on power board (29), check the wiring between the
two connectors or replace power board (29).
♦ Replace panel (26) and/or power (29) boards.
EXTERNAL CURRENT SETTING TEST (torch potentiometer or push button).
Power board (29), connector CN1, terminals 2(+) and 3(-) = 0 – +5 Vdc, turning the
potentiometer on the torch.
Power board (29), connector CN1, terminals 6(+) and 8(-) = 0 Vdc (UP command), with UP
button pressed (+5 Vdc with button released).
Power board (29), connector CN1, terminals 5(+) and 8(-) = 0 Vdc (DOWN command), with
DOWN button pressed (+5 Vdc with button released).
♦ Check the wiring between CN1 power board (29) and CN1 panel board (26).
♦ Make sure the torch connector in correctly inserted in connector (I).
♦ Check potentiometer on the torch. If defective, replace.
♦ Check UP/DOWN buttons. If defective, replace.
♦ Replace panel (26) and/or power (29) boards.
♦ Regular operation. If that in spite some function during the welding it is not corrected replace
power board (29).
3.302.212
Correct?
YES
Correct?
YES
Correct?
YES
NO
NO
NO
10
12/01/06