Cebora PLASMA PROF 164 HQC Service Manual page 17

CEBORA S.p.A.
♦ Check power cable and plug and replace if necessary.
♦ Check the mains voltage conditions.
SERVICE TRANSFORMER (50) POWER SUPPLY TEST.
Fuse board (50), connector J6, terminals 0 - 230 = 230 Vac; connector J6 – 0 and connector J7
– 400 = 400 Vac; connector J6 – 0 and connector J7 – 440 = 440 Vac.
♦ Check the wiring between mains input terminal board (55) and connector J5 pre-
charge board (45), and between connector J6 pre-charge board (45), switch (39)
and connectors J6 and J7 of fuse board (50).
♦ Make sure the service voltage change is correctly positioned, on the voltage
change terminal board of the transformer (27).
♦ Check fuse F2 on pre-charge board (45); replace if broken, and make sure there is
no short-circuit in the service transformer (50) or corresponding wiring.
♦ Make sure the primary service transformer winding (50) is not interrupted.
♦ Check switch (39); replace if defective.
♦ Replace pre-charge board (45).
SETTINGS BOARD (54) POWER SUPPLY TEST.
Settings board (54), connector J6, terminals 1 and 2 = 18 Vac; terminals 5 and 6 = 20 Vac.
♦ Check the wiring between J6 settings board (54) and J4 fuse board (50).
♦ Check fuses F2 and F3 on fuse board (50); if broken, replace and make sure that
terminals 1 - 2 and 5 - 6 of J6 on board (54) are not short-circuited.
♦ Check 18 Vac voltage on terminals TP3–18V and 20 Vac on terminals TP4-20V1
of fuse board (50); if missing, check the wiring between the service transformer
and fuse board (50), and if necessary replace the service transformer (50).
CONTROL BOARD (38) POWER SUPPLY TEST.
Control board (38), connector J4, terminals 1(+) and 2(-) = +8 Vdc.
Control board (38), connector J13, terminals 5 - 10 = 27 Vac.
♦ Check the wiring between J4 control board (38) and J5 settings board (54).
♦ With Power Source off, temporarily disconnect J4 on control board (38) and
check on J5 of settings board (54), terminals 1(+) and 2(-) voltage = +8 Vdc. If
correct, replace control board (38). If incorrect replace the settings board (54),
also making sure that terminals 1 and 2 of J4 on control board (38) are not short-
circuited. If necessary, also replace the control board (38).
♦ Check the wiring between J13 control board (38) and J5 fuse board (50).
♦ Check fuse F7 on fuse board (50); if broken, replace and make sure that terminals
5 - 10 of J13 on control board (38) are not short-circuited.
3.302.218
Correct?
YES
Correct?
YES
Correct?
YES
NO
NO
NO
17
9/8/2006