C
)
4
7-2.6 F12 (KV UNDER)
The measured tube voltage is lower by 50% or more than the preset value (
detected by software, at 20ms
after exposure and at each 100ms )
NOTE) Most probabily that glow discharge has occurred in the X-ray tube.
When checking the IGBT gate waveform, take proper action such as short-circuiting to prevent generation of
high voltage in accordance with Appendix C in the Installation Manual.
Check CP9 (TKV)
and CP12 (RKV) on
X CONT.
RKV abnormal?
Or both normal?
Perform adjustment
related to tube voltage
shown in Appendix C in
Installation Manual.
Readjust FVR
YES
NO
Waveform
at CP29 (F), CP33
(A/D) or CP34 (B/C)
normal?
X CONT is abnormal.
→Replace it.
X CONT or NEXSC is
abnormal.
→Replace them in turn.
Only either
KVFB+ or KVFB-
output?
YES
NO
One side of high voltage
transformer is defective.
→Replace high voltage
transformer.
IGBT
gate waveform on
INVERTER UNIT
normal?
INVERTER UNIT is
abnormal.
→Replace it.
①Xraytube
② High voltage transformer
③High voltage cable
may be defective.
If FVR does not become normal, proceed to next step.
If does not become normal, proceed to next step.
Abnormal
Normal
Normal
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