Where is the drum & fuser rolls located on a sharp sf-2022 copier

developing unit malfunction

Most likely if you replace the toner cartridge it will resolve the problem.

No( There are no Sharp SF 2200 Ethernet and USB- ports, There is no a jet-lan type card. sorry. For you any help((
Sharp 2020 Code Description CC Original detection problem CH Lit Steadily: Sorter not installed, or not turned on CH Flashing: DV unit not installed, not connected properly, or not latched in place properly F1 Sub code 00: Communication error between main board and sorter. Sub code 02: Sorter transport motor drive. F2 Sub code 31: Image density sensor. Could be a problem with light level. Sub code 32: Drum mark sensor problem. . Does not see mark on drum or sensor not working properly. H2 Sub code 00: Fuser thermistor open. H3 Sub code 00: Fuser temperature too high. H4 Sub code 00: Fuser temperature too low. Lamp, thermal switch, connections. L1 Scan forward problem. Motor, sensor, board L3 Scan forward problem. Motor, sensor, board. L4 Drive problem; main motor, gear, sensor, bind. L5 Lens problem. Motor sensor board. L8 Sub code 01: Zero cross. P Paper feed problem or no paper PC Card counter not installed U2 Sub code 01: Memory loss. U4 Sub code 00: Communication problem between copier and duplex unit. U5 Sub code 00: Communication problem between main board and ADF.

could be multiple things.
Does it do it when you print a counter page?
No>
mirrors or glass are dirty.

Yes>
Charge roller
drum
drum cleaning blade
or fuser rollers
difficult to tell which one without looking at it.
Good luck

Open front cover, you will see yellow knob, pull it down and pullout. Wipe the side with mesh with clean cloth and insert back. That's the main charge unit.
Pull the green lever to the left and pullout the transfer charger . Wipe the two wires carefully not to break them and insert back.

Do not try to remove the drum if you have no skills otherwise this should solve your problem.

This means the machine is over-toning ie using more toner than required caused by either improper toner or different brand of toner. The correct toner is sf 222T1. Replace developer and use the right toner and clean the drum and its blade. You may need to clean fuser rollers for cleaner copies.

Check the copy lamp and its thermal fuse if they are okay, then clean optics, check drum and blade and clean or replace and finally clean or replace fuser rollers. If the above is ok and still black copies, check the copy lamp wire harness for continuity or the copy control board located underneath the display panel and check for bad component like triac and replace. If OK replace the main control board.

clean the paper feed rollers with soap and water damp cloth take paper tray out use flashlight to locate rollers also clean registration roller under the drum check and see if u have any broken gear teeth on your fusing assemby also if after cleaning it works i recommend u replace feed rollers

Potential causes: dirty rollers, dirty glass, bad fuser, or even a bad drum.

I'd start with making sure all of the rollers and paper feeders are clean. You can use a damp cloth, or even a cloth with a little bit of rubbing alcohol and clean the rollers really good. I'd also make sure the glass is clean. Use windex and clean real good.

If problem persists, then it could be a fuser or drum. Try replacing the fuser first.

Hope this helps.

mr engineer please check the drum mark sensor and clean it and also check the check the toner motor connector and do this program    c interrupt 0 interrupt ,44 copy key 07 copy key after stoping the machine off and then on but first clean drum unit maintenance code is 20 then copy key and then three times ca ca ca