How to fix error code E020 in Canon iR Content IR 2520 2525 2530 2535 2545

Error code: E020-0000

The path between the sub hopper and the developing assembly is
clogged with toner. The Developing Assembly Toner Sensor (TS1) detects the absence of toner,while the Sub Hopper Toner Sensor (TS2) detects the presence of toner. With the Developing Cylinder Clutch (CL3) turned on, the hopper feedscrew motor (M7) is rotated for 1 sec intermittently 194 times still, theDeveloping Assembly Toner Sensor (TS1) does not detect the presence of toner.
Error occurs after the delivery if a paper in passage exists.

1. Check the rotation of hopper motor gear. (If rotating, false detection by the sensor is doubted. Feed the toner to the developing unit in
service mode: CLEAR-ENGIN-TNRINST.)
2. Replace the Developing Assembly Toner Sensor (TS1)
3. Replace the Sub Hopper Toner Sensor (TS2).
4. Replace the DC Controller PCB (PCB4)

All Error codes

E000-0001

E001-0000

E001-0001

E001-0002

E002-0000

E003-0000

E004-0000

E010-0001

E010-0002

E014-0001

E014-0002

E019-0000

E020-0000

E024-0000

E024-0001

E025-0000

E025-0001

E110-0001

E110-0002

E110-0003

E196-0000

E197-0000

E197-0001

E202-0000

E240-0000

E240-0001

E246-0000

E247-0000

E261-0000

E350-0000

E354-0000

E355-0000

E355-0004

E355-0005

E500-0000

E505-0001

E520-0001

E520-0002

E531-8001

E531-8002

E532-0001

E532-0002

E540-0001

E540-0005

E542-0001

E542-0005

E567-0001

E567-0002

E571-0001

E571-0002

E575-0001

E575-0002

E602-0001

E602-1105

E711-0001

E713-0000

E716-0000

E716-0010

E719-0000

E719-0002

E736-0000

E744-0001

E744-0002

E744-0003

E744-0004

E804-0000

E804-0001

E805-0000

E805-0001

E805-0002

E805-0003

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