Cebora SPOT 3500 Service Manual page 13

CEBORA S.p.A.
AUTOMATIC SINGLE STROKE OPERATING MODE TEST.
Switch (1) in automatic mode (lever to the left), switch (11) in single stroke mode (lever up),
q
power source output terminals = waveform as in fig. 5.2.5, each time the start button is
pressed.
Press the start button several times, turning the potentiometer (2) to a different position each
q
time, and make sure that the length of the pulse packet changes to the maximum duration of
1 second (a single pulse packet for each time the start button is pressed).
♦ Check the wiring between connector CN4 on the control board (27) and static
switch (14).
♦ Check the wiring between switches (1), (11) and connectors CN3 and CN5 on the
control board (27).
CN3, terminals 1 and 2 = > kohm (contact open), terminals 3 and 4 = 0 ohm
(contact closed) = automatic mode.
CN5, terminals 1 and 2 = 0 ohm, contact closed = pulse train mode.
CN5, terminals 1 and 2 = > kohm, contact open = single-stroke mode.
If incorrect, check the status of the switches (1) and (11), and replace if defective.
♦ Check the wiring between connector CN2 on control board (27) and current
transducer (28).
♦ With power source powered, check voltage on CN2 of control board (27),
terminals 3 – 2 (gnd) = fig. 5.2.6, during the current output time, with start button
pressed (+12 Vdc, with start button released). If incorrect, check the status and
proper assembly of the current transducer (28). If in doubt, replace.
♦ Check the connections between the secondary transformer circuit (26) and output
terminals of the power source. If you find loose or burnt connections, clean
thoroughly and tighten, or replace any damaged terminals or components.
♦ Replace static switch (14).
♦ Replace control board (27).
♦ Correct operation.
3.302.047
Correct?
YES
NO
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