Cebora SOUND MIG 3840/T Pulse Service Manual page 22

CEBORA S.p.A.
motor control board (232). If >Mohm in both directions, (circuit broken) replace
the connector board (225).
♦ Replace the connector board (225) and/or motor control board (232).
START COMMAND TEST.
Connector board (225), terminal J4-1 (-) and J4-2 (+) = 0 Vdc with start button pressed, +12
Vdc with button released (either with button connected to the central adapter (BA), or with
button connected to the connector (BB)).
♦ If the start command comes from the central adapter (BA), check the wiring
between J4 connector board (225), central adapter (BA), torch central adapter, and
torch button. Replace the entire torch if necessary.
♦ If the start command comes from the connector (BB), make sure the connector J5
is properly welded (especially pins 1 and 9) on connector board (225), and check
the wiring between the patch connector of the torch and the torch start button.
Replace the entire torch if necessary.
♦ Replace connector board (225).
START SIGNAL TEST.
Motor control board (232), OP6 optocoupler (near J7), pins 1 (+) – 2 (-) = +1 Vdc with start
button pressed (0 Vdc with button released).
♦ Replace motor control board (232).
♦ Check the wiring between connector J7 motor control board (232) and connector J3 connector
board (225).
♦ With power source off, temporarily disconnect the flat cable from connector J7 on motor
control board (232), and check the resistance between terminals 8 and 10 of J7 on motor
control board (232). Correct value = junction of two diodes in both probes senses. If a short-
circuit or broken circuit is detected, replace the motor control board (232).
♦ Replace connector board (225).
3.302.191
Correct?
YES
Correct?
NO
NO
YES
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15/02/05