Normaly this would not be a user adjustment, possibly the grub screw hold the wheel hub to the motor has come loose, very small allen key needed, you make be able to shift it back to right place.
Usualy this is done with special alignment jig
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Your ribbon may be stuck check it out, buy the way I bestow the sacred order of thee nomenclatcher Maximus for bestowing the information that is actually need in great detail, you would not beleive how non- descript some people are ie My typewriter doesn't work right? After a good public flogging I may get some information out of them, well done! Bret PS, It's rare but you may have popped a drive gear with power off, and unplugged try and move the print carriage (gently) back and forth it should move with about a Pound of resistance and not catch or sound crunchy, fluid motion will tell, good luck.
Put in a multi-part form, type if the carbon is OK the problem is with the ribbon. Look at the ribbon if there is an impression on the ribbon but no ink transfer the ribbon is very ols, if there is no impression then the ribbon isn't lifting. THere ix a 2" black gear on the right side of the printer it should move easily if not wiggle it back and forth they get tooth for tooth with the drive gear.
First try opening and closing the top cover. If that does not reset the print wheel to the correct characters, check and make sure the correction tape is not interfering with the wheel as it spins. If that is not the case remove the print wheel and make sure non of the spokes are bent. If they are you can try bending them back to the right position or you may have to replace it.
REMOVE & RE-INSTALL THE DAISY WHEEL, MAKING SURE THE HOMING PIN IS IN THE HOLE NEAR THE HUB OF THE WHEEL. IF IT STILL DOESN'T PRINT THE RIGHT CHARACTERS, THE PRINTWHEEL MOTOR OR MAIN BOARD COULD BE BAD. TOSS IT AND BUY ANOTHER MACHINE
CAUSE: my guess would be a stripped gear or a lack of prssure on the "pinch wheel" which would cause a loss of traction on the paper feeder.
SOLUTION: 1- change the stripped gear (if it's stripped)
2- add a layer of adhesive tape on the loose pinch wheel (if it's loose)
both solutions require to open case (to access loose wheel or stripped gear). To determin what the probleme is, try to run a print and try to move or pull gently on the lable ribon while in function. Two possible outcomes are that the gear will only "hook" in some areas if it's stripped. If it's loose the paper will only move while pulling on it.
Assuming that you have the correct print wheel fitted and that the typewriter is on standard key board setting then I would look at anything that might be interfering with the rotation of the print wheel. First, remove the print wheel and check that none of the character arms are distorted,then look at how the correction tape is fitted. If this tape is not fitted correctly it could be interfering with the rotation of the print wheel.
The ML-300 needs to be reset each time the Daisy Wheel is removed or replaced or if the Keyboard Switch changes
position. According to Brother, if this is not done the typewriter will print incorrect characters.
Try these steps:
1) Open the Top Cover. There is a lever directly behind the Daisy Wheel. Pull the lever back towards you. Remove
the Daisy Wheel by pulling it up and out.
2) Verify that it is the Standard Daisy Wheel that came with your machine and not a Symbol or International Daisey
Wheel. Write down the Pitch (10, 12, or dual pitch 1012) printed on the wheel.
3) Reinstall the Daisy Wheel (the plastic top ear goes to your right.) Push the lever (step 1) forward.
4) Press the ALT key plus the PITCH key and the number 1 key simultaneously. Verify the Pitch setting is the same as
is printed on the Daisy Wheel.
5) Press the CODE key plus the RESET key and the letter Q key simultaneously. This will reset the typewriter
mechanism and align (or time, in technical terms) the carriage mechanism.
Check if the typewriter prints correctly now. If still incorrect, perform these additional steps.
6) Verify the three position Keyboard Switch (inside the top cover, on the right side, at the bottom) is in the
I=Standard position. The other positions are: II=International and III=Symbol.
7) If the Keyboard Switch is in the correct position, slide it to position III and then back to I. (This will clean the
switch contacts in case they are dirty and not making good electrical contact.
8) Press the CODE key plus the RESET key and the letter Q key combination again to reset the typewriter mechanism.
Check if the typewriter prints correctly now.
If still incorrect, the only other things I can think of is that:
1) an incorrect Daisy Wheel is installed that does not work in the ML-300. Brother sell a "B type" Daisy Wheel with
two plastic ridges/raised slots below the center of the Daisy Wheel (viewed with the raised top tab on your left.)
The B type are incompatible with your machine.
2) the typewriter has failed and needs repair.
Does it always type the same wrong letter ie
a always prints u or w ? if so the print wheel drive gear is out of position. if not and it get random letters some thing may be interfering with the wheel rotation.