Sedecal SHF-310 - Page 279

HF Series Generators
T roubleshooting
TR-1005R4
39
C. HV TRANSFORMER TEST
1. Connect the scope as follows:
G CH.1 on + mA (TP14) on HT Controller Board.
G CH.2 on - mA (TP13) on HT Controller Board.
G Base Time in 10 ms per division and 1 V per division
2. Turn ON mains and Generator. Set Dip-switch 3000SW2-4 in ON position at the HV Controller
Board. Select 50 kVp, 25 mA and 50 ms.
3. Make an exposure and check that both waveforms are almost symmetric (a difference of ±10%
is normal).
G If it is OK, follow procedure in step-4.
G If it is not OK, check:
-- that in the mA test point of the HV Transformer the jumper is securely placed and
tighten.
-- that connector J1 is well placed and tighten in the HV Transformer.
-- continuity between J1-D and P4-7, J1-E and P4-6, J1-B and P4-2, and J1-C and P4-1.
Check that they are well connected and tighten.
-- if after these actions the waveform is not OK, replace HV Transformer.
4. Turn OFF Generator and mains.
5. Remove HV Cables from the HV Transformer (anode and cathode) and fill the HV Receptacles
with oil.
6. On the HT Controller Board, make a jumper FIL (TP8) and + 5 V (TP2).
7. Turn ON mains and Generator. Select 50 kVp, 50 mA and 50 ms.
8. Connect the scope as following:
G CH.1 on + kV (TP11) on HT Controller Board.
G CH.2 on --kV (TP12) on HT Controller Board.
G Base time in 10 msec. per division and 2 V per division.
9. Make an Exposure and check that both waveforms are symmetric.
10. Make exposures from 50 kVp to 110 kVp with the same Exposure Time and check that all kVp
waveform are symmetric and the values are similar according the table below.
Select
TP11 & TP12
on the HT Controller
(Compact Generators)
50 kVp 2.1 V
70 kVp 2.9 V
90 kVp 3.7 V
110 kVp 4.5 V
130 kVp (only for 150 kVp HV Transf.) 5.3 V