Acteon X-MIND prime 3D ceph - Page 188

Service Manual – Troubleshooting
SERVICE MANUAL • X-MIND prime 3D • (19) • 11/2019 • NXMPEN080A
186
9.2.7.2 E751: kV over voltage
This message is displayed when a value higher than expected has been detected
on the Generator board (A2).
With the unit switched OFF (at least for 4 minutes), perform the following tests:
1. Check that connector X57 is well connected: connect it and verify if the error is
still present.
2. With the connector X57 CONNECTED, using a multimeter, perform the
measures listed in the following table:
Parameter
Connection
Value
Feedback kV +
X57-4(GND) and X57-2
13.3k Ω ± 2%
Feedback kV -
X57-4(GND) and X57-3
14.3k Ω ± 2%
3. With the connector X57 DISCONNECTED perform the measures (connector
side) listed in the following table:
Parameter
Connection
Value
Insulation between the
PINs of the power tube
filament
X57-5/6 and X57-4
Infinite
Insulation between
primary H.V. winding
and GND
X56-1/2 and GND
(Tubehead shell)
Infinite
Feedback kV +
X57-4 and X57-2
19.8 ÷ 20.2 k Ω
Feedback kV -
X57-4 and X57-3
19.8 ÷ 20.2 k Ω
IF values measured at point 3 are incorrect, replace the tubehead (see paragraph
11.3.9).
IF values measured at point 2 are incorrect, while values measured at point 3 are
correct, replace the Generator board.
IF values measured at point 2 and 3 are correct, the X57 connector is well inserted
and its connections to the tubehead are OK, replace the Generator board and then
the tubehead.