Cebora 965, Service Manual, Page: 8 / 24

CEBORA S.p.A.
8
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).
‰
Operations preceded by this symbol refer to situations that the operator must verify (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 (38) off.
MAINS SUITABILITY TEST.
Correct?
‰
Missing voltage at the power source input due to tripped mains protections.
NO
YES
♦
Eliminate any short-circuits on the connections between power cable, switch (29),
transformer (44), contactor TLP (30) and control board (6).
♦
Check the insulation towards earth of the transformer (44) and fan (39). If leaking
or short-circuited towards earth, replace.
♦
Mains not suitable to power the power source (ex.: insufficient installed power).
MAINS CONNECTION TEST.
Correct?
‰
Terminals U, V and W of switch (29) = approximately 3 x 400 Vac (or 3 x 230 Vac,
approximately, according to mains voltage) with switch (29) closed.
YES
NO
♦
Check power cable and plug and replace if necessary.
♦
Check switch (29) and replace if defective.
♦
Check the mains voltage conditions, and especially that none of the three power
supply phases is missing.
CONTROL BOARD (6) POWER SUPPLY TEST.
‰
Control board (6), connector J7, terminals 1 and 7 = 230 Vac approximately.
‰
Control board (6), terminal 1 of J1 and terminals 1 of J2 = 24 Vac approximately.
‰
Control board (6), terminal (-) of bridge rectifier W1 (-) and D5 diode cathode (+) = +16 Vdc
approximately; terminal (-) bridge rectifier W1 (-) and D5 diode anode (+) = +5 Vdc
approximately. All with switch (29) closed and both with mains at 230 and at 400 Vac.
3.302.173 28/07/04