Lanier LD425c scanner memory is full how do you fix?

SOURCE: scanning

Try and switch the machine off and then back on again. This should erase the memory.

SOURCE: Scanner - memory is full

A KM-2550 has 64 MB RAM built in. I believe less than 30 of it is for image storage. You may be able to lower your scan resolution. 
Best solution is to add more memory. Look for a Kyocera compatible 100 pin dimm (don't buy from the manufacturer). It will read 16 MB to 256 MB sticks. You have to take out 6-8 screws holding on the part of the back the sticks out on the upper left. Make sure after installing you print a status page to make sure the memory was recognized.

SOURCE: insufficent memory to send scanned document

What model? If it has a touch screen do what it says: In "scanner mode" touch the "status" button on the screen..all scans show up with the status.Touch the appropriate scan, and touch "delete" (or cancel)

SOURCE: service code 561 error

Hello sir; Just follow my direction, it will reset your machine;
1, press "clear mode", "107", then press and hold down "clear/stop" key.
2, touch "copier SP" on the screen.
3, enter "5810-001" press enter.
4, set value to 0, then turn power off and back on again.

SOURCE: KM 7235 message - File Memory Full

there is a limited amount of memory in the machine but you may be able to improve performance by installing the optional hard drive hd103a