2
2
2-21
2-21
Technical Overview > Image Formation System > Service Works > Notes on service works
Technical Overview > Image Formation System > Service Works > Notes on service works
■
Toner Cartridge Absence/Presence Detection
The engine controller detects the position of the Toner cartridge detection flag to judge the
absence/presence of the Toner cartridge.
At the time of turning on the power or closing the upper cover, the engine controller judges
the position of the Toner cartridge flag based on the output result of the leading edge sensor
(PS751).
When the output result of the leading edge sensor (PS751) is L, it is judged that the Toner
cartridge is absent; If being H, it is judged that the Toner cartridge is present.
Engine controller
PS751="H"
Toner cartridge
detection flag
Leading edge
sensor detection flag
PS751
PS751="L"
Toner
cartridge=Yes
Toner
cartridge=No
The leading edge sensor performs both this detection and paper feed detection. Therefore,
the engine controller cannot make a judgment of ‘Toner cartridge absent’ or ‘jam occurrence’
when jam occurs.
The engine controller judges this case as ‘Toner cartridge absent’ and notices it to the main
controller.
F-2-28
If jam occurs when ‘Toner cartridge absent’ is detected, check if there is a fault in the leading
edge sensor and the detection flag.
Service Works
■
At parts replacement
No work is required for this product at parts replacement.
■
Maintenance
No periodically replaced parts, durable parts or periodical service is set for this product.
■
Notes on service works
None.
Summary of Contents for MF4500 Series
Page 222: ...5 5 Adjustment Adjustment Mechanical Adjustment ...
Page 224: ...6 6 Trouble Shooting Trouble Shooting Test Print Trouble Shooting Items Version Upgrade ...
Page 230: ...7 7 Error Codes Error Codes Overview Error Codes ...
Page 234: ...8 8 Service Mode Service Mode Overview COPIER FEEDER FAX TESTMODE ...
Page 251: ... Service Tools Solvent Oil List General Circuit Diagram General Timing Chart Appendix ...
