41 - Connector Board (225) Missing Or Disconnected; 42 - Error In The Signal Of The Motor (404) Encoder; 43 - Communication Error With Connector Board (225) - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.

3.7.11 - 41 - Connector board (225) missing or disconnected.

CONNECTOR BOARD (225) CONNECTED TEST.
Motor control board (232), terminals 1(+) and 2(-) of OP4 = approximately +1.2 Vdc, with
power source powered.
♦ Check flat cable between J3 connector board (225) and J7 of motor control board
(232).
♦ With power source off, temporarily disconnect J7 from motor control board (232)
and check the resistance on terminals 4 and 6 of J7 on motor control board (232).
Correct value = junction of two diodes in both directions measured. If incorrect,
replace the motor control board (232).
♦ With the power source off, temporarily disconnect J7 from the motor control
board (232) and power up the power source again. Make sure that on terminals
6(+) and 4(-) of the patch connector disconnected from J7 of motor control board
(232) the voltage = approximately +12 Vdc. If incorrect replace the connector
board (225).
♦ Replace motor control board (232).

3.7.12 - 42 - Error in the signal of the motor (404) encoder.

The signal provided by the encoder built into the motor (404) is used as a speed feedback
signal to adjust the motor speed. "Error 42" indicates that the signal provided by the encoder is
not suited to the reference signal generated by the motor control board (232), and thus the motor
(404) speed is out of control.
Perform the "wire feeder motor operation" test in par. 3.5.7.

3.7.13 - 43 - Communication error with connector board (225).

The communication error may be due to incorrect communication line supply voltages, or to
an actual failure to recognize the data exchanged between the boards.
In the latter instance, check flat cable between J3 connector board (225) and J7 of motor
control board (232), especially terminals 14 (RX signal) and 13 (TX signal), and proceed by trial
and error, replacing the connector board (225) and/or the motor control board (232).
SERIAL COMMUNICATION LINE POWER SUPPLY TEST.
Motor control board (232), terminals 6(+) and 5(-) of OP8 = approximately +5 Vdc, with
power source powered.
♦ Check flat cable between J3 connector board (225) and J7 of motor control board
(232).
♦ With power source off, temporarily disconnect the flat cable from J7 on motor
control board (232) and check the resistance on terminals 9 and 11 of J7 on motor
control board (232). If a short-circuit is detected, replace the motor control (232)
and connector (225) boards.
♦ With power source off, temporarily disconnect flat cable from J7 on motor control
board (232) and check resistance on terminals 12 and 14 of J7 on motor control
3.302.191
Correct?
YES
Correct?
YES
NO
NO
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15/02/05