AR-155 (serv.man3). AR150N 155N Service Manual (Update for N version product) - Sharp Copying Equipment Service Manual (repair manual). Page 3

The memory device is used to monitor the life of the developer cartridge in the way that the machine reads and writes information (e.g.page count)
to the memory device equipped in the developer cartridge.
When the life is reached, the memory device becomes nonfunctional to prevent the deterioration of image/text quality and machine damages.

Remaining print quantity 

≥ 8K

Remaining print quantity 

< 8K

Remaining print quantity

= 0

Maintenance

lamp

Toner lamp

Error code

Maintenance

lamp

Toner lamp

Error code

Toner lamp

Error code

During
maintenance 
period

Start

OFF

OFF

–

OFF

OFF

–

OFF

–

Toner Near

OFF

ON

–

OFF

ON

–

ON

–

Toner End

OFF

BLINK

–

OFF

BLINK

F2

BLINK

F2

After
maintenance 
period

Start

ON

OFF

–

ON

OFF

–

OFF

–

Toner Near

ON

ON

–

ON

ON

–

ON

–

Toner End

ON

BLINK

–

ON

BLINK

F2

BLINK

F2

Note: When the memory device is faulty, “U2” will be displayed.

(Error code " F2 ")

Is 18K copy/print
reached ?

Is toner empty
detected ?

Is toner empty
detected ?

End of life

Copying

Copying

Add toner

(2) Copy/print Volume = 18K

Conditions for End of life

(1) Copy/print Volume > 10K

and Toner empty occurs or

Is 10K copy/print reached ?

10K is set to be a threshold 
value (A value to allow / forbid
toner add).

Yes

Yes

Yes

Yes

No

No

No

No

Handshake

New developer cartridge
(Initial value of print count   : 18K)

Machine

The initial value of page count
is set to 18K according to the
developer life.

Initial Count 18K

Machine counts down
 from 18K

AR-155N

1  –  2