Cebora SOUND MIG 2035/M Pulse Service Manual page 25

CEBORA S.p.A.
CURRENT ANALOG REFERENCE SIGNAL TEST.
Control board (27), connector J12, terminal 23(+) (or C86 left side) and connector J14 (-) =
0 / +5 Vdc adjustable with knob (I).
♦ Check the wiring between connectors J12 on control board (27) and J1 on panel
board (41), and make sure the push-pull board (43) is properly mounted on panel
board (41).
♦ Replace the control (27) and/or panel (41) and/or push-pull (43) boards.
CURRENT TRANSDUCER (33) POWER SUPPLY TEST.
Current transducer (33), terminals +(red wire)(+) and –(black wire)(-) = +27 Vdc.
♦ Check the wiring between J4 control board (27) and current transducer (33).
♦ With the power source off, temporarily disconnect the connector J4 from the
control board (27) and make sure that the + and - terminals of the current
transducer (33) are not short-circuited. If necessary, replace both the current
transducer (33) and control board (27).
♦ Replace the current transducer (33) and/or control board (27).
POWER SOURCE OUTPUT CURRENT FEEDBACK SIGNAL TEST.
Control board (27), connector J4, terminals 7(+) – 8(-) = approximately +6 Vdc, with power
source powered and start button not pressed; approximately +13 Vdc, with start button
pressed and power source loaded (table conditions).
♦ Check the wiring between diode group (56), and the central torch adapter (38),
and between choke (29) and power source output terminal (F). If you find short-
circuits or loose connections, restore the original connections and replace any
damaged components.
♦ Make sure the current transducer (33) is correctly mounted on the cable between
transformer (30) central socket and choke (29).
♦ Replace the control board (27) and/or current transducer (33).
♦ Make sure that the control board (27) is correctly set by carrying out the MINIMUM
CURRENT THRESHOLD SETTING TEST in par. 3.4.7.
♦ Replace the control (27) and/or power (26) boards.
♦ Replace the transformer (30) and/or diode group (56) and/or choke (29).
3.302.161
Correct?
YES
Correct?
YES
Correct?
YES
NO
NO
NO
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24/03/2004