Cebora PLASMA PROF 123 ACC Service Manual page 12

CEBORA S.p.A.
CONTROL BOARD (47) POWER SUPPLY TEST.
Control board (47), connector J1, terminals 1 - 2 = 24 Vac (start button, torch recognition,
central adapter protection circuits power supply).
Control board (47), connector J10, terminals 7 - 14 = 27 Vac (solenoid valves, contactors,
pre-charge relay on pre-charge board (3) power supply).
Control board (47), connector J8, terminals 1(+) and 2(-) = +15 Vdc.
Control board (47), connector J8, terminals 3(+) and 2(-) = -15 Vdc.
Control board (47), connector J8, terminals 4(+) and 2(-) = -15 Vdc.
Control board (47), connector J8, terminals 5(+) and 6(-) = +8 Vdc.
with switch (49) closed.
♦ Check the wiring between J1 control board (47) and J2 fuse board (53).
♦ Check fuse F1 on fuse board (53). Replace if broken after having checked, with
Power Source off and J1 disconnected from control board (47), the resistance
between terminals 1 and 2 of J1 on control board (47). Correct value = >Mohm in
both directions (7 Kohm approximately, with CP161 torch inserted in the central
adapter (41)). If incorrect, replace control board (47).
♦ Check 24 Vac voltage on terminals 0V-24V on fuse board (53); if lacking check
the wiring between services transformer (53) and fuse board (53) and replace
services transformer (53), if necessary.
♦ Check the wiring between J10 control board (47) and J4 fuse board (53).
♦ Check fuse F4 on fuse board (53). Replace if broken after having checked, with
Power Source off and J4 disconnected from fuse board (53), the resistance
between terminals disconnected from J4 of fuse board (53). Correct value =
>Mohm in both directions. If incorrect, replace control board (47).
♦ Check 27 Vac voltage on terminals 0V-27V on fuse board (53); if lacking check
the wiring between services transformer (53) and fuse board (53) and replace
services transformer (53), if necessary.
♦ Check the wiring between J8 control board (47) and J1 supply board (51).
♦ With Power Source off, temporarily disconnect J8 on control board (47) and
check on J1 of supply board (51):
- terminals 1(+) and 2(-) = +15 Vdc;
- terminals 3(+) and 2(-) = -15 Vdc;
- terminals 4(+) and 2(-) = -15 Vdc;
- terminals 5(+) and 6(-) = +8 Vdc.
If correct, replace control board (47).
If incorrect, replace the supply board (51), first making sure that terminals 1-2, 3-
2, 4-2 and 5-6 of J8 on control board (47) are not short-circuited. Also replace
control board (47), if necessary.
♦ Replace control board (47).
3.302.269
Correct?
YES
NO
12
12/04/2012