7
7-2.9
F21 (MA OVER) and F22 (MA UNDER)
(detected by software, at 20ms after exposure and at each 100ms )
F21: The measured tube current is higher by approximately 50 mA or more than the preset value
F22: The measured tube current is approximately 50% or less of the preset value .
When these messages are displayed, check the heating system also in accordance with the flow chart for F31
and F32.
Check RMA(CP13) and
TMA(CP11) on X CONT.
RMA abnormal?
Or both normal?
Adjust FVR again.
YES
X CONT or NEXSC is abnormal.
→
Replace them in turn.
X-ray tube may be
defective.
Only TMA is abnormal.
Same error occurs again.
