Standard Frequency Series Generators
Maintenance
12
M-2008-7-15
7.6 TROUBLESHOOTING THE TIMING-HIGH TENSION-AND FILAMENT CIRCUITS
SYMPTOM
MOST COMMON PROBLEM
HOW AND WHERE TO TEST
Rotor Runs READY lamp
lights BACKUP CONTACTOR
contacts close and
EXPOSURE lamp lights
during exposure, but no X-
rays are emitted from the X-
Ray Tube.
NO MA.
P1 and P2 not Energized.
SCR’s Did Not turn ON. You
must confirm that the SCR’s
are operating properly. Check
ERROR MESSAGE.
Run a SIMULATED LOAD TEST.
The X-ray Tube Filament
selected is not lit.
The Cathode High Voltage
Cable has an open lead. It
is not providing solid contact
between the x-ray tube and
the high voltage transformer’s
cathode receptacle.
X-ray Tube Filament is open.
VISUAL INSPECTION
Remove Collimator. Select large and then small X-ray filaments.
See if each filament lights up during PREP.
If both filaments
light up properly, the problem is in another area. Disregard
the rest of this section.
If the filaments do not light, continue.
SELECT ALTERNATE MA STATIONS AND SEE IF X-RAY
EXPOSURES ARE POSSIBLE.
If x-rays are possible on either the small or large focal setting
but not both, the problem may be in the following areas.
1. Arc Suppression Insulator on ends of Cathode Cable.
Remove them and with a thin knife blade, carefully
spread the cable pins. Clean cable ends, apply
insulating compound, insert into receptacles, tighten and
test. If problem remains ohm out cathode cable leads.
Install new cathode cable.
2. X-ray tube filament is open. Replace X-ray Tube.
3. Filament Circuit is open or shorted. Continue with next
test and for additional troubleshooting,
See LOW MA-NO MA Section.
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