Chapter 5 Service Instructions
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC
5-73
High Voltage (H.V.) A17 Tank Removal
When removing H.V. Tank A17, keep tank upright at all times. Refer to
Figure 2-11 and proceed as follows:
1. Set the power on/standby switch on the Operator Control Panel
(OCP) to the standby ( ) position.
2. Set the ON/OFF circuit breaker CB1 on the generator cabinet to
OFF position.
3. Loosen nine (9) screws that secure the Generator Cabinet Cover
to the Generator Chassis.
4. Wait two minutes before removing the Generator Cabinet Cover
to allow the Capacitor Bank to discharge.
5. Carefully slide the Generator Cabinet Cover up and away from the
generator to prevent damaging the circuit boards on the genera-
tor front door.
6. Connect a DVM across the positive and negative terminals of the
DC Capacitor Bank(s) (C9-C11 on Models QG-20-SE, QG-32-SE,
QG-40-SE and QG-50-SE; C9-C16 on all other models) to check
that the capacitors are fully discharged. If they are fully dis-
charged, it is safe to work on the generator.
7. When capacitors are fully discharged, remove the Plexiglas shield
above the High Voltage Tank.
8. Loosen four (4) screws securing the clear plastic high-voltage
acrylic protection panel from the generator chassis and remove
panel.
9. Disconnect the anode and cathode high-voltage cables from the
High Voltage Tank.
10. Disconnect the Feedback Connector A17P1 from High Voltage
Tank connector A17J1.
11. Disconnect H.V. Tank cable PC1 from Power Module A19 lower
right IGBT terminal.
12. Disconnect H.V. Tank cable PC2 from the right terminal on Capac-
itor C7.
13. Disconnect H.V. Tank cable PA1 from the left terminal on Capaci-
tor C4.
14. Disconnect H.V. Tank cable PA2 from Power Module A18 lower left
IGBT terminal.
15. Disconnect the yellow/green ground wires from the High Voltage
Tank ground stud.
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