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There are a number of reasons why the paper would jam at registration. First off, if the paper is completely flat & straight it is probably a feed issue or paper detect issue. There are 2 little black photo reflectors before the rollers in the centre of the feed path. These sensors can get covered with paper dust & may need cleaning. Also try feeding paper from the manual feed tray & see if it jams. If you have jams from both cassette's & manual feed then its most likely a sensor of feed issue. If its from one tray only then the sensors in the vertical path may be dusty with paper dust or worn pick up & feed tyres. There is also an issue with the feed clutches in the paper pick up drive unit which can fail & have been upgraded.
Secondly, if the paper is Z folded at the registration rollers but before the fuser then it could be the primary bed drive gear. This gear also drives the secondary belt unit located in the right hand door assembly.
Hope this helps.
The problem is in weakened solenoid's (SD2) spring (10). That solenoid located under metal cover (13) on left side of 1690MF (if look at front of them). Required solenoid has red wires. Remove metal cover with 3 screw, unscrew solenoid and just slightly stretch spring (10). That is all.
F 28-01 High voltage power supply abnormality. Ihe charging ON/OFF operation has been performed five consecutive times since the charging trouble detection signal was detected at start of charging.If there is a paper in copying process when this jam occurs,the machine stops after completion of copied paper ejection.Verify the charge wire,change and the holders.Check the high voltage unit. F - 28 -02 Toner transfer wire malfunction F - 28 -03 Toner separation wire.malfunction
It depends on where it is jammng, if it is in the feed area change paper or clean the feed rollers above the paper tray. If it is crunching the paper look to see what is stopping it and correct it. If it still jams in the machine you need a tech to see why.
Please check the sensors and actuators ,open & close front door to reset nisfeed.Clarification Top feed = Automatic Document Feeder?If YES,please verify misfeed paper beetween coverplaten and feedbelt(Yellow).Is necessary disassembly the ADF.Good luck.You will find a little paper.
You most likely have a "claw" out of place in the fusing section. These are sharp little spring guided teeth that keep the paper off of the heated roller. If you had a paper jam and pulled the paper out forcefully it can flip these claws out of place, causing it to cut your paper. (or jam more often). To find these claws, follow the heat. They rest on the hottest part of the pressure rollers of the fuser.