Cebora SPOT 3500 Service Manual download pdf (Page 8)

CEBORA S.p.A. 8

3.302.047 21/12/00

Correct?

3.3 - Troubleshooting.

WARNINGS

ANY INTERNAL INSPECTIONS OR REPAIRS MUST BE CARRIED OUT BY QUALIFIED

PERSONNEL.

BEFORE REMOVING THE PROTECTIVE GUARDS AND ACCESSING INTERNAL

PARTS, DISCONNECT THE POWER SOURCE FROM THE MAINS.

NOTE

Items in boldface describe problems that may occur on the machine (symptoms).

q Operations preceded by this symbol refer to situations the operator must determine (causes).

♦ Operations preceded by this symbol refer to actions the operator must perform in order to

solve the problems (solutions).

3.3.1 - The power source does not start, lamp (6) off.

MAINS SUITABILITY TEST.

q No voltage for mains protection.

YES

♦ Eliminate any short-circuits on the connections between power cable, switch (5),

transformer (26) and static switch (14).

♦ Check the wiring between terminals 8 - 9, 11 - 12 of CN4 on the control board

(27) and static switch (14).

♦ Make sure that the static switch (14) is not short-circuited. Replace if necessary.

♦ Make sure the windings of the transformer (26) are isolated from one another and

from earth. If insulation leaks, replace the transformer (26).

♦ Make sure that the static switch (14) is properly engaged. For this test, insert the

oscilloscope (with memory if possible) on the power source output terminals, set

the power source to automatic mode, switch lever (11) to the left, and press the

gun start button while holding it free in the air (open circuit operation). In this

condition, the static switch (14) must be engaged simultaneously with the peak of

the sine curve of the mains voltage (fig. 5.2.1), thus approximately 90° - 100°

before it crosses 0. If necessary, set the trimmer RV2 on the control board (27).

More accurate adjustment is possible by measuring the current at the primary

circuit of the transformer (26), using a TA and oscilloscope, and adjusting the

trimmer RV2 until the first current peak is as high as subsequent peaks. For this

test, we recommend making several attempts, moving the trimmer RV2 each time

to seek out the ideal position.

♦ Replace control board (27).

♦ Mains not suitable to power the power source (ex.: insufficient installed power).

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IBRAHIM KONATE 09 Jun 2024 | 01:14:14

IBRAHIM KONATE 09 Jun 2024 | 01:14:51

Cebora SPOT 3500 Service Manual Page 8