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Replace the Daisy wheel cartridge, pull back on the small red top lever and it should rotate the print hammer back exposing the Daisy wheel cartridge, lift out and replace with new one, push the print hammer back forward till it latches and captures the new daisywheel. Turn unit on and let it initialize, try typing, it should be OK. Examine old daisy wheel you will find the G and H segments are probably missing.
Solenoid pad is worn out. Look below left of the printwheel down inside the carriage and you should see a little white or opaque rubber pad. It needs to be replaced. You have to take it to a shop for proper repair. I have in the past, replaced it by digging the old one out with tweezers and hook. Then fish the new one in there.
If the characters are showing up different than the ones you pushed then your wheel is probably bent. First, open the clear cover on your ml100. Second there is a black lever that you pull towards you. Next, you pull the wheel out and if any of the arms on it are bent than straighten them out, and make sure none of the arms are over lapping. Next, return the wheel, push the black lever back into place, close the clear cover and then hold down the code button and press the reset key (the "q" key). If that does not work then you need a new wheel. This is what just worked for me, I hope it helps.
I downloaded the manual from http://www.devicemanuals.com/downloadguide.php and then, following the instructions there, I removed then re-inserted the daisy wheel. This solved my problem. Perhaps it had somehow gotten out of adjustment. At least, it is something to try if you haven't tried it already.
I was just playing with a WW 1500 and the only way i got anything close to what you described was to stop the carrier on tab and return it so it slammed at the l. margin. Check and see if the carrier moves fairly freely from side to side with power off. If so check the circut board over and under for debris.
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.