P/N 9-500-0255 6-13
Service Manual
Chapter 6: Maintenance—Remove and Replace Procedures
Gantry Components—Remove and Replace
J. While maintaining a secure hold on the HV Generator Assembly mounting
plate, remove the 6 bolts securing the upper portion of the mounting plate
to the Gantry frame. Set the assembly aside.
K. Using the hardware removed in Steps 1.G and 1.H above, replace the HV
Control Filament and Inverter boards previously removed.
L. Replace the ribbon cable removed in Step 1.E above between the HV
Inverter board and HV Control Filament board.
M. Place the HV Generator Assembly (with boards and ribbon cable re-
installed) aside for packaging prior to shipping to L
ORAD for repair.
2. Replace the new HV Generator Assembly as follows:
A. Unpack the new HV Generator Assembly and place on level work surface.
B. On the HV Control Filament board, disconnect MJ1 and MJ2.
C. On the HV Inverter board, disconnect GJ2.
D. Remove the Ribbon Cable between the HV Inverter board and the HV Con-
trol Filament board. Set aside for re-installation later.
E. Remove the 6 screws securing the HV Control Filament board to the stand-
offs on the mounting plate. Remove board from standoffs and set aside.
F. Remove the 13 screws securing the HV Inverter board to the standoffs on
the mounting plate. Remove board from standoffs and set aside.
G. While maintaining a secure hold, position the HV Generator Assembly
mounting plate flush against the Gantry frame. Secure upper portion of the
mounting plate in position using 6 bolts previously removed in Step 1.J
above.
H. Secure lower portion of the mounting plate to the Gantry frame using 5
phillips screws previously removed in Step 1.I above.
I. Using the hardware removed in Steps 2.E and 2.F above, replace the HV
Control Filament and Inverter boards previously removed.
J. Replace the ribbon cable removed in Step 2.D above between the HV
Inverter board and HV Control Filament board.
K. On the HV Control Filament board, connect MJ1, MJ2, MJ4, MJ5, MJ6, MJ7,
and MJ8.
L. On the HV Inverter board, connect GJ1, GJ2, GJ3, and GJ5. Dress wires
using cable ties as necessary.
M. On top of the HV Multiplier, connect the HV cable to the receptacle.
N. Perform the following procedures before returning unit to service:
• Chapter 4, Section 4.1, Tube Voltage Calibration
• Chapter 4, Section 4.3, Filament Current (mA) Calibration
• Chapter 4, Section 9.1,kV Control Offset Calibration, p. 59
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