Canon imageRUNNER ADVANCE C2000 Series Technical Workbook page 66

- E020-0360: Low density for the Bk target at patch detection.
- E020-0391: The average Bk value of detected ATR sampling value is equal to or higher than the specified
value.
- E020-03b1: The Bk T/D ratio detected by the ATR Sensor is equal to or lower than the specified value (light
density)
[Reference] Output may become available by turning the main power switch off/on when E020-03b1 occurs.
Cause
The Toner Level LED (light emitting section) and the Toner Level PT PCB (light receiving section) on the
Toner Level Detection Area took charge resulting in toner adhering to the light emitting section and the light
receiving section. Therefore, the presence of toner was detected despite the hopper being out of toner.
Then toner was not supplied resulting in this symptom.
[1] Toner Feed Assembly, Black
[2] Toner Level Detection Area (light receiving section)
TP11 168c.pdf
Service work
1) In Service Mode > COPIER > Counter > MISC > T-SPLY-K, write down the numerical value. Let this
numerical value as "a".
2) Add up all the numerical values in Service Mode > COPIER > Counter > PICKUP >
C1/C2/C3/C4/MF/2-SIDE and write down the obtained numerical value. Let this numerical value as "b".
3) In Service Mode > COPIER > Counter > MISC > SUC-A-K, write down the numerical value. Let this
numerical value as "c".
4) Calculate the numerical values "b" and "c" as shown below and obtain the numerical value "d". d= (b x
c)/100
pg. 64