9
7-2.11 F31 (IF OVER) and F32 (IF UNDER)
(Detected by the software at each 800ms when prep. and at each 400ms when ready up)
F31: The measured filament current is higher by 50% or more than the preset value .
F32: The measured filament current is lower by 50% or more than the preset value .
Check FVR(CP15) and
IFV(CP7) on X CONT.
Both
normal? Or only FVR
abnormal?
X CONT or NEXSC is
abnormal.
→Replace it.
YES
①X CONT,
② INVERTER UNIT or
③High voltage (filament)
transformer
may be defective.
In case of F31, ②
and ③ rarely occur.
C0 and CL
waveforms normal?
INVERTER UNIT or X
CONT is abnormal.
→Replace it.
YES
NO
Only IFV is abnormal.
In the last item, ① and ② means defect in the detection system. Actually, the possibility of ③ is high.
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