Villa Rotograph EVO, Service Manual

Page: 109 / 223

SERVICE MANUAL
Troubleshooting
Rotograph EVO (Rev. 1) 8-18
8.2.4.1. E750: No power to the HF board
This message is signalling that the Generator board (A10) is not powered.
Check that if LED H3 of the Generator board is ON; in affirmative case,
check connector X53 insertion and insert it correctly. Check the voltage
between TP21 and TP22; it should be 10 V DC
± 2V; if the value is inside
the range, replace the Generator CPU board (A9). If the value is zero (or
very low), replace the Generator board.
If LED H3 is off, perform the appropriate operations as described in the
previous chapter.
8.2.4.2. E751: Over voltage kV
This message is displayed when a value higher than expected has been
detected on the Generator board (A10).
Check that connector X57 is well inserted. With the connector inserted,
measure the resistance between pins 2 and 4 of connector (harness to
tubehead) that should be 13.3k ± 2% while is 14.3k ± 2% between pins 4
and 3 of the same connector; if correct values are measured, replace
before the tubehead and, eventually, the Generator board.
If incorrect values are measured, replace the tubehead and then the
Generator board.