Cebora PLASMA SOUND PC 110/T Manual De Servicio página 56

CEBORA S.p.A.
3.4.7 Err 74: [High temperature of the IGBT group].
This error (high-temperature in output diodes) is generated when the temperature on
heatsink (42) of the IGBT modules reaches a limit value. In this situation, it is
advisable to leave the power source running in order to keep fan (21) in operation
and thus cool the diode heatsinks more rapidly.
Resetting occurs automatically once the temperature returns within the permitted
limits.
Control board (48), terminals FS1 (+) and FS2 (-) = 0 Vdc, contact on thermostat (29)

closed, (temperature correct) (+7 Vdc approximately, contact open, temperature
over the limit).
♦ Check that fan (21) is working correctly (see section 3.3.2).
♦ Check that the air flow is correct and that the ventilation tunnel contains no dust
or obstacles to cooling.
♦ Check that the work conditions comply with the technical specifications values;
in particular respect the "service factor".
♦ Replace control board (48)if working conditions are correct.
Note: with contact open voltage at terminals FS1 (+) and FS2 (-) = 7 V +/- 5 %
3302342
♦ Check terminals FS1 and FS2 of control board (48).
♦ replace control board (48).
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10/07/2019