Cebora PLASMA PROF 80 Service Manual page 16

CEBORA S.p.A.
♦ With the power source off, temporarily disconnect the wires from terminals TP1, TP2, TP3,
TP4 and TP5 on the power board (20) and check the integrity of the scr rectifier bridge,
making sure that resistance on the aforementioned terminals of power board (20) = >Mohm
for all measurements. If incorrect replace the scr rectifier bridge on the power board (20) or
the entire power board (20) (between TP4 and TP5 you will find a resistance of 280 ohm due
to the resistor (39) connected between J2 and J3. To exclude it, also disconnect J5 on the
power board (20)).
♦ With the power source off, temporarily disconnect connector J1 on the power board (20) and
check the integrity of the scr rectifier bridge, checking the gate junction of each scr on the
following terminals of J1: terminals 1 and 2 = terminals 3 and 4 = terminals 5 and 6 =
terminals 7 and 8 = terminals 9 and 10 = terminals 11 and 12 = approximately 25 ohm. If
incorrect replace the scr rectifier bridge on the power board (20) or the entire power board
(20).
♦ Replace the setting (19) and/or power (20) boards.
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25/06/04