HF Series Generators
T roubleshooting
TR-1005R4
40
11. Select the maximum kVp allowed (depending of the tube type) and maximum Exposure Time
allowed but NEVER
go over than 110--130 kVp. Make several Exposures and check that
waveforms are correct. If the waveforms are not symmetric within ± 10% at any point, replace
the HV Transformer .
12. Repeat the above procedure for the X-ray Tube-2 if the installation has two tubes.
13. If everything is OK, it means that HV Transformer is OK and the problem could be in X-ray Tube
or in the HV Cables. To know when the Tube begins to arc follow procedure in parragraph D.
In any case, X-ray Tube must be replaced.
14. Set in the HT Controller Dip-switch SW2 position 4 in OFF and remove jumper between FIL (TP8)
and + 5 V (TP2).
D. X -RAY TUBE TEST
Although after the performance of the above referred test everything is found OK, the Service
Engineer may want to know the actual status of the tube. Perform the following procedure in order to
determine the point in which the X-ray Tube begins to arc, it is strongly recommended to replace the
tube as soon as possible to prevent potential damage to the Generator.
1. Select minimum kVp and minimum mA and 100 ms.
2. Make an exposure.
3. Increment kVp in 10 kVp steps, select same mA and time. Make an exposure.
G If “E09” or “Generator Overload” appears follow procedure in step C.1 (HV Transformer
Tes t) .
G If not, keep on incrementing the kVp in steps of 10 kVp (60, 70, 80, 90, 100, 110, 120 and
125 kVp for 125 kVp HV Transformers; and 130, 140, 150 kVp HV Transformers) making
exposures at each kVp selected.
-- If “E09” or “Generator Overload” appears at any kVp selected it means that the tube
has dielectric problems above the selected kVp.
• If “E09” or “Generator Overload” does not appear up to maximum kVp, it means that arcing may
be due to mA or kW, follow procedure in step-4.
4. Select minimum kVp and minimum mA. Increment the mA one station and make an Exposure.
Keep on incrementing the mA station (making exposures) until “E09” or “Generator Overload”
appears. This will give an idea of the maximum mA allowed by the tube without arcing. If “E09”
or “Generator Overload” does not appear follow step-5.
5. If still the tube does not arc, the problem is related to kW=KV*mA. Make selections on the
Console at 100 ms incrementing kV and mA. A point will be reached in which “E09” or “Generator
Overload” will appear. This will give an idea on the approximate value of kVp and mA that can
be handled by the X-ray Tube. Anyway , this value may change when the tube heats up.
E. RANDOM “E09” OR “GENERATOR OVERLOAD”
If everything is OK and random “E09” or “Generator Overload” appears, check:
1. That the signal IGBT F AULT on pin 3 of P5 on the HT Controller Board is not low (logic 0) in
stand-by and during the exposure. If there is noise, check loose connection between pin 3 of
P5 on HT Controller Board, and pin 4 of J2 in both IPM Driver Boards
2. If IGBT FAULT is active during an exposure, try to isolate when it occurs. It may be due to noise
coming from any device outside the Generator (Bucky, Fluoro devices, etc.). Or it may occur
when selecting a high power Exposure and the voltage of the main line goes down more than
10% (in this case check the part number of the IPM Driver Board, it must be A3063-03 or greater).
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