Cebora PLASMA PROF 80 Service Manual page 9

CEBORA S.p.A.
SERVICES POWER SUPPLY TEST.
Fuse board (18):
all with switch (8) closed and rated mains voltage.
♦ Make sure the wiring and the fuses on the fuse board (18) are intact, based on the
diagram and fuse table in par. 5.3.
♦ With the power source off, temporarily disconnect the connectors J1, J2, J3 and J5
on fuse board (18), and check the voltages on the above connectors again. If the
values are not correct, replace transformer (50). If correct, seek out which of the
disconnected connectors is the cause of the operating error and replace the
component to which it is connected.
CONTROL BOARD (9) POWER SUPPLY TEST.
Control board (9), potentiometer P1, terminals 3(+) and 1(-) = +5 Vdc; terminal 1 of
potentiometer P1(-) and cathode of diode Z1(+) = approx. +22 Vdc, with switch (8) closed.
♦ Check the wiring between connectors J1 control board (9) and J7 setting board
(19), and between J1 setting board (19) and J3 fuse board (18).
♦ With the power source off, temporarily disconnect the connector J1 on control
board (9). Power up the power source again and check on the patch connector
disconnected from J1, on the terminals 3(+) and 1(-) voltage = approximately +22
Vdc, and on terminals 4(+) and 2(-) voltage = +5 Vdc. If correct, replace control
board (9). If incorrect replace the setting board (19).
♦ Replace the control (9) and/or setting (19) boards.
♦ Replace control board (9).
3.302.167
terminals J4 = approx. 230 Vac;
terminals J5 = approx. 230 Vac;
connector J1, terminals 1 and 2 = approx. 24 Vac;
connector J2, terminals 1 and 2 = approx. 27 Vac;
connector J3, terminals 3 and 4 = terminals 2 and 3
YES
YES
Correct?
NO
Correct?
NO
9
= approx. 16 Vac,
25/06/04