APX 525/625 Generator Revision C Diagnostics
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 163
DIAGNOSTICS
Troubleshooting Topics for the APX 525/625 Generator
• No Ready Light
• Ready Light is Active, but No Exposure Occurs
• Consistent kV Fault
• Intermittent kV Fault
• Long Exposure Times with Light Films
• Long Exposure Times with Dark Films
• Apparent Small Focus, Open Filament Condition
• No mA Feedback
• No kV Feedback or Improper kV Feedback
Note:
Before beginning troubleshooting check all DC power supply voltages.
NO READY LIGHT
Check the door and collimator interlocks. Lack of a rotor OK signal as well as the
door or collimator interlocks (all Low True) will inhibit the Ready light.
Do you have a valid PREP command?
Do you hear the activation of any relays when the <PREP> button is pressed? The
PREP command activates several heavy relays in the rotor boost and run circuitry
that can be heard from the outside of the power module.
Some pre-existing fault conditions that have already been latched by hardware will
inhibit generation of the PREP request signal by the CPU.
Is the rotor running?
An open X-Ray tube thermal switch will inhibit the rotor boost and run cycle.
1. Is the x-ray tube thermal switch open? Check relay K10 on the I/O Board. Also,
check fuses F2 and F3 on the I/O Board
2. Check CB1 & CB2 on the I/O Board (in series with rotor boost and run voltages)
3. Check for presence of rotor current sense voltages at the current sensing
sampling resistors R1 & R2 on the I/O Board
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