Power Source Powered, Control Panel On, Fan (512) Stopped - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.

3.5.2 - Power source powered, control panel on, fan (512) stopped.

The fan (512) on the power source is controlled by the interface board (543), and its operation
depends on the power source conditions, as shown in the par. 2.4, Description of MIG3840/T
Pulse power source. For this reason, the following tests may be verified only during the first 15
seconds of power supply or during a blocked situation. For this purpose it is possible to
simulate the error 41, by disconnecting the connector J3 on connector board (225).
FAN (512) TEST.
With the power source off, temporarily disconnect connector J3 on connector board (225) to
cause continuous operation of the fan (512).
Control board (543), connector J4, terminals 1 (+) – 2 (-) = +24 Vdc.
♦ Check the wiring between fan (512) and connector J4 on interface board (543).
♦ Make sure there are no mechanical impediments blocking the fan.
♦ Replace the fan (512).
CONTROL BOARD (543) POWER SUPPLY TEST.
Micro board (543), connector J3, terminals 2 (+) – 1 (-) = +8 Vdc.
Micro board (543), connector J3, terminals 4 (+) – 3 (-) = +15 Vdc.
Micro board (543), connector J12, terminals 1 (+) – 6 (-) = +5 Vdc.
Micro board (543), connector J1, terminals 1 (+) – 5 (-) = -15 Vdc.
♦ Check the wiring between J3 micro board (543), and J10 flyback board (539).
♦ With the power source off, temporarily disconnect connector J3 on control board
(543) and check the resistance between terminals 2 and 1 and between terminals 4
and 3 of J3 on micro board (543). If short-circuited, replace control board (543)
and flyback board (539).
♦ Make sure the micro board (543) and the interface board (543) is properly
mounted, especially that there are no bent pins or short-circuits between the pins
of the connectors J10 and J11 of the interface board with J10 and J11 of micro
board, on the control board (543).
♦ Replace the flyback (539) and/or control board (543).
♦ Replace the control board (543) and/or fan (512).
3.302.191
NOTE
Correct?
NO
Correct?
YES
YES
NO
19
15/02/05