Cebora PLASMA PROF 80 Service Manual page 14

CEBORA S.p.A.
CURRENT TRANSDUCER (34) POWER SUPPLY TEST.
Setting board (19), connector J2, terminals 3(+) and 2(-) = +15 Vdc; terminals 1(+) and 2(-) =
-15 Vdc.
♦ Check the wiring between the current transducer (34) and connector J2 on setting
board (19).
♦ With the power source off, temporarily disconnect connector J2 on setting board
(19). Power up the power source again, keeping the cable of the current transducer
(34) disconnected, and check the supply voltages again. If correct, replace the
current transducer (34). If incorrect replace the setting board (19).
FOR THE FOLLOWING TESTS RE-CONNECT THE CONNECTOR J1 ON HF BOARD
(25) TO ENABLE GENERATING HIGH FREQUENCY.
PILOT ARC CURRENT TEST.
Setting board (19), connector J2, terminals 4 and 2 (gnd) = fig. 5.2.3 (pilot arc current signal)
with start button pressed and pilot arc lit.
♦ Regular pilot arc operation.
♦ Check the wiring between the current transducer (34) and connector J2 on setting board (19).
♦ With the power source off, temporarily disconnect connector J2 on setting board (19), and
make sure resistance on J2 terminals 4 and 2 = approximately 10 Kohm (load resistance of the
current transducer (34)). If incorrect replace the setting board (19).
♦ Check wiring between terminals 5 and 6 of the central adapter (12) and J1 on HF-filter board
(22) (nozzle potential), between J2 of HF-filter board (22) and J2 of relay board (27), between
J1 of relay board (27), resistor (38) and J2 power board (20).
♦ With the power source off, check the resistance of the resistor (38). Correct value = 1.3 ohm.
If incorrect, replace the resistor (38).
♦ Check the continuity between terminals TP4 and J2 on the power board (20). Reset the
connection on the board if necessary, considering that the solenoid with reed bulb (26) must
be inserted.
♦ Check the continuity between terminals J1 and J2 on HF-filter board (22). Reset the
connection on the board if necessary.
♦ Replace current transducer (34).
♦ Replace the setting (19) and/or control (9) and/or power (20) boards.
3.302.167
Correct?
YES
WARNING
Correct?
NO
NO
YES
14
25/06/04