Carriage Makes a grinding noise when it is returned. A sears Brother from about 1980

Turn the printer on, and replace the cartridges if possible. If the carriage moves, but there is still a grinding noise, there may be a paper feed issue. If the carriage will not move, then it is a carriage stall issue.

The Printer Makes a Grinding Noise When It is Turned On or ...

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Can my anything.
Check the bearings, this makes often such a noise especially in certain curves while driving.

Remove the cover from the motor housing and check the drive gear.

GEARS ARE NOT MOVING FREELY. CHECK GEARS

Brother GX8250 typewriter; my problem is with the carriage. The return key returns the carriage to the original left-side position, but fails to advance to the next line.

yes, that is a carriage jam and not paper, the grinding is from the clean station that gets blocked with dried ink and cant move. you need to open the printer and clean the ink off of the clean station so it can clean properly and not cause a carriage jam.

Your printers carriage belt has gone loose you are required to change it. I'd advise you to send it to an expert because changing of a belt in your ink jet is not feasible with guidence through text messages.
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make it sure the cover of typewriter was lock ,self lock no movement of cover means good operation of typewriter.

Problem The Resume light continues to blink after the paper jam is cleared.
OR
The carriage is stuck or making a grinding noise. Solution 1. Lift the top cover to the printer. 2. Turn the printer off and then on again. 3. Unplug the power cable from the back of the printer when the grinding noise starts. 4. Move the carriage towards the middle of the printer (this procedure may take a couple of tries to get the timing correct). 5. Take out the cartridges and close the top cover. Turn the printer back on! 6. Reconnect the power cord. 7. Open the top cover, reinstall the cartridges, and then close the top cover

Try new toner cartridge, or even the old one if you still have it. Check if the grinding noises go away.