Canon imagePRESS C1 Service Manual - page 370
Chapter 7
7-21
E020-xx83 Dark current measurement is 90 or greater in patch detection
E020-xx84 Difference between the background measurement and the dark current measurement is 30 or less in patch detection
E020-xx85 Difference between the patch measurement and the dark current measurement is 30 or less in patch detection
E020-xx86 Difference between the patch measurement and the background measurement is 30 or less in patch detection
E020-xx87 Dark current measurement is 930 or greater in patch detection
E020-xx88 Dark current measurement detected by the front sensor is 30 or less in patch detection
E020-xx89 Dark current measurement detected by the rear sensor is 30 or less in patch detection
E020-xx8A Dark current measurement detected by the front sensor is 90 or greater in patch detection
E020-xx8B Dark current measurement detected by the rear sensor is 90 or greater in patch detection
E020-xx90 Calculation result of the patch scans with the patch sensor (analogue) is less than 16
E020-xx91 Calculation result of the patch scans with the patch sensor (analogue) is 880 or greater
E020-xx92 Value obtained from calculation results of the patch scans with the patch sensor is - 5.0 % or less in three consecutive times
E020-xx93 Value obtained from calculation results of the patch scans with the patch sensor is + 5.0 % in three consecutive times
E020-xxA0 Sig value is less than 62 in the ATR control
E020-xxA1 Ref value is less than 62 in the ATR control
E020-xxA2 Sig value is 960 or greater in the ATR control
E020-xxA3 Ref value is 960 or greater in the ATR control
E020-xxA8 Detected T/D ratio in the ATR control exceeds the maximum value (14%) in three consecutive times
E020-xxA9 Detected T/D ratio in the ATR control falls below the minimum value (3%) in three consecutive times
E020-xxC0 Standard deviation in light Sig values of 8 samples is 100 or greater
E020-xxC1 Ref standard deviation is 100 or greater in the ATR control
E020-xxC2 Standard deviation of Sig (average data) is 400 or more in default patch detection
E020-xxDA Standard deviation of Sig (initial data) is 100 or more in default patch detection
E020-xxDB Standard deviation of Ref (initial data) is 100 or more in default patch detection
xx refers to the numbers assigned to each color developing assembly.
01=Y
02=M
03=C
04=Bk
7.4.8 ATR Control
0020-4148
imagePRESS C1+ (Printer) / imagePRESS C1+
The ATR control is executed to supply the toner to the developing assembly by calculating the supply amount from the toner consumption.
1. Description
a. Toner Supply Calculation
The amount of toner supplied to each developing assembly is determined.
This equipment calculates the necessary volume of toner supply based on data collected in three different ways.
- Video Count (counts each document output when printing)
Estimates the amount of toner consumption from video counts data, and thus calculates the amount actually consumed.
- Data from the Patch Image Scan Sensor (PS3) (performed sheet-to-sheet)
The patch image scan sensor measures toner image formed in the drum, and based on the data collected the amount of toner supply is adjusted so that the
over all density will get close to the target density.
- Data from the ATR Sensor (PS7) (detects every 8 document output of color print on A4 paper)
The ATR sensor detects the patch image density and the developer (toner and carrier) in the developing assembly cylinder of each color. If the results fall
outside of the target density range, toner supply target will be either increased or decreased.