RUN XT: Service & Maintenance Manual - rev. 2.0
Page 6.5
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
WARNING: Carry out these checks with the machine powered up.
(1) Slightly lift connector CN1 on the power supply. Place the tester probes between pins 4 and 6
on that connector. The measured voltage should be approximately 220 Vac or 110 Vac
depending on the type of mains electricity supply.
(2) Slightly lift connector CN2 on the power supply in order to access the pins with the tester
probes. Check that all the output voltages of the power supply are correct by referring to
paragraph 2.5.2. “Wiring”.
(3) As for point (2) but on connector CN1 of the display CPU board.
(4) As for point (2) but on connector CN4 of the inverter interface board.
(5) As for point (2) but on connector CN2 of the inverter interface board.
(6) Slightly lift the Fastons on the machine power inlet socket. Place the tester probes between the
live and neutral terminals of the connector. The measured voltage should be approximately 220
Vac or 110 Vac depending on the type of mains electricity supply.
(7) As for point (6) but on the input of the automatic circuit breaker.
(8) As for point (6) but on the output of the automatic circuit breaker.
(9) As for point (6) but on the input of the filter.
(10) As for point (6) but on the output of the filter.
(11) Using the tester probes, check the continuity of the fuse holder by measuring its resistance.
This is correct if the measured value is less than a few Ohms.
On certain machines, it has been found that the display turns off after the “Clear” key is
pressed. To solve this problem, mount a 15 Ohm 5 W resistor between pins 3 and 4 of
connector CN4 of the inverter interface board. This modification is standard on
machines starting from SN D241U 50000010 (USA), D240 50003665 (ITA) and D240
50003649 (UK) (production date 13/02/98).
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