APX 525/625 Generator Revision C Diagnostics
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 169
2. Place the mA/Rotor card on an extender card
3. Check outgoing filament reference signal by connecting a voltmeter or
oscilloscope at U23, pin 1 to ground
4. Turn ON generator and prep the unit. The voltage should be approximately 5
VDC. If the output voltage is not present, check for the input reference voltage at
Pin K on the edge connector of the board. If the input reference voltage is greatly
different from the output voltage, there may be a problem on the mA/Rotor
Board. A missing input reference voltage could indicate a problem on the Data
Board
Category II - Intermittent kV Fault
For any re-installations of this equipment: Verify that the primary cable between the
high-tension transformer and power module has not been altered so that it is longer
than the standard 8-foot length.
Check for a faulty Exposure switch
Note: Be sure the exposure button is always fully depressed until the audible
exposure indicator terminates! (Bouncing exposure switch contacts may also result
in faults.)
1. Turn generator OFF
2. Place the logic PCB on an extender card
3. Connect an oscilloscope to R30 closest to the “M” pin and logic ground
4. Set the amplitude to measure 12 volts DC
5. Make an exposure to observe the active low pulse. It should be one single low
pulse. A multitude of pulses with a single press of this switch is the indication of a
bouncing switch
Check if filament pre-heat adjustments for small or large and/or mA level
adjustment on the mA Rotor Board are set too high or too low
1. Turn off the generator
2. Place the mA/Rotor board on an extender card
3. Connect an oscilloscope probe to the MA+ test point on the mother board
4. Set SW1-1 to the off position on the Control CPU board to see indicated mA on
the screen
5. Turn on the generator and select manual mode, large filament, 60 kV and 10
mAs with an exposure time of at least 60 milliseconds
6. Make an exposure
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