It doesn't print
I've seen this exact error a few times on the 4101s & turned out to be a bad EIO hard drive.If you replace the drive, you'll most likely have to download the newest firmware & load it to get every feature back.
You can try & initialize the drive first though:
- Turn off printer
- Press & hold [Start] button
- Turn printer on, wait for all 3 LEDs to stay solid then release button
- Press & release [Left] arrow button (should read "Initialize Disks" on display
- Press & release [Select], then wait for printer to warm up
Listen also to the drive & if you hear it clicking over & over then it's bad & will need replaced.
SOURCE: HP laserjet 4650; displaying error 49, FF81 Service Error
Unplug the power cord for 10 seconds
SOURCE: 49 FF81 error on HP Laserjet 3035xs MFP
49.XXXXX ERROR To continue turn off then on A critical firmware error has occurred.1. Turn the device off, and then turn the device on. 2. Go to www.hp.com/support/ LJM3027mfp or www.hp.com/support/ LJM3035mfp to check the latest firmware image version. If the latest firmware image version is newer than the one installed on the device, upgrade the device. 3. Try printing a job from a different software program. If the job prints, go back to the first program and try printing a different file. If the message appears only with a certain software program or print job, then the error is in the software program and not in the device. If the job fails to print using a different software program, then turn off the device and disconnect all cables that connect the device to the network or to a computer. 4. Remove any DIMMs and EIO cards, and then turn the device on. 5. If, after removing DIMMs and EIO cards, the device behaves normally, turn off the device and reinstall DIMMs and EIO cards one-by-one, turning off the device off and then on again each time you reinstall a DIMM or EIO card. If a certain DIMM or EIO card causes the message to reappear, replace the DIMM or EIO card. 6. Reconnect all cables that connect the device to the network or to a computer. 7. If the message persists, replace the
formatter (see Formatter on page 116).
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