Chapter 5 Service Instructions
Revision W HF Series X-ray Generators - Service Manual
5-76 Quantum Medical Imaging, LLC
4. Wait two minutes before removing the Generator 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 DC Capacitor Bank (C9-C16) and verify
the capacitors are fully discharged.
7. When capacitors are fully discharged, loosen four (4) screws
securing the clear plastic high-voltage acrylic protection panel
from the generator chassis and remove panel.
8. Disconnect anode and cathode high-voltage cables from High
Voltage Tank.
9. To remove Power Module A18:
a. Disconnect IGBT Driver Cable (P/N AY51-015) plug A18A3P5
from IGBT Drive Board A18A3 (P/N AY40-010T) connector J5.
b. Disconnect H.V. Tank cable terminal PA2 from Power Module
A18 IGBT lower left IGBT terminal.
c. Disconnect the two black jumper wires from Power Module
A18 lower right IGBT terminal.
d. Tag and disconnect the red and black cables from Power
Module A18 IGBT (+) and (-) bus bars.
e. Remove the six (6) 8-32 x 1/4" screws that hold Power Mod-
ule A18 to the rear wall of the Generator Chassis and remove
Power Module.
10. To remove Power Module A19:
a. Disconnect IGBT Driver Cable (P/N AY51-023) plug A19A3P5
from IGBT Drive Board A19A3 (P/N AY40-010T) connector J5.
b. Disconnect H.V. Tank cable terminal PC1 from Power Module
A19 lower right IGBT terminal.
c. Disconnect the two black jumper wires from Power Module
A19 lower left IGBT terminal.
d. Tag and disconnect the red and black cables from Power
Module A18 IGBT (+) and (-) bus bars.
e. Remove the six (6) 8-32 x 1/4" screws that hold Power Mod-
ule A19 to the back of the Generator Chassis and remove
Power Module.
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