Cebora SPOT 3500 Service Manual download pdf (Page 11)

CEBORA S.p.A. 11

3.302.047 21/12/00

Correct?

3.3.3 - In open circuit operation, the output voltage is not regular.

OPEN CIRCUIT OUTPUT VOLTAGE TEST IN MANUAL MODE.

Potentiometer (3)

position

Output voltage

Vac

Waveform

at minimum 2 Fig. 5.2.2

at maximum 7 Fig. 5.2.3

q Switch (1) in manual mode (lever to the right), power source output terminals = voltage

values and waveforms as in the table, with start button pressed.

q Holding down the start button, turn the potentiometer (3) and make sure the line of the output

voltage waveform changes in a linear, non-abrupt fashion, between the minimum and

maximum values of fig. 5.2.2 and 5.2.3.

YES

♦ Check the wiring between CN4 control board (27) and static switch (14).

♦ Check the wiring between the switch (1) and connector CN3 on board (27):

CN3, terminals 1 and 2 = 0 ohm (contact closed), terminals 3 and 4 = > kohm

(contact open) = manual mode. If incorrect, check the status of the switch (1) and

replace if defective.

♦ 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).

NOTE

Timed operation is not possible in the following test, as timing begins only when the output

current exceeds approximately 100 Aac.

OPEN CIRCUIT OUTPUT VOLTAGE TEST IN AUTOMATIC MODE.

q Switch (1) in automatic mode (lever to the left), power source output terminals = 7 Vac and

waveform per fig. 5.2.3, with start button pressed, regardless of the position of the

potentiometers (2) and (3) and the switch (11).

YES

♦ Check the wiring between CN4 control board (27) and static switch (14).

♦ Check the wiring between the switch (1) and connector CN3 on board (27):

CN3, terminals 1 and 2 = > kohm (contact open), terminals 3 and 4 = 0 ohm

(contact closed) = automatic mode. If incorrect, check the status of the switch (1)

and replace if defective.

♦ 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.

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Cebora SPOT 3500 Service Manual Page 11

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