東芝2051c復印機開機報CE20知識問答,服務技術資料 ，CE20 Image quality sensor abnormality (no pattern level):
The output value of this sensor is out of a specified
range when the image quality control test pattern is
not formed.
P. 26-95
蘇州東芝報修電話696l6769，維修，售后服務