Below is information on how to trouble shoot issues that may happen, with your knitting machine, and you always do have issues. That way you can try to figure it out what is going on yourself before sending it in for repairs. I found this information on line at the Knitting Closet. With that said, I would discourage you from taking apart the knitting carriage unless you know what you are doing, I did this and created a mess.
"Make your Knitting Machine Sing"
One book that is a must have for all machine knitters is Make your Knitting Machine Sing. It is the best book out on the market to make sure your knitting machine runs like a dream. Just google it as many places sell it like DK Knits for around $23 and AMAZON for about $26.
In addition to the information below, I have information on how to properly align your knitting machine with your ribber which is one of the most important things you can do for successful double bed knitting. If this is not done correctly, even if everything else is ok, you will get dropped stitches or other issues. The pamphlet shows both Brother/KnitKing and Silver Reed/Studio knitting machine main bed and ribber alignment.
How to Align your Ribber Properly
(both Silver Reed/Studio and Brother KM.'s)
Brother Chunky Ribber Adjustment
Brother Standard Ribber Adjustment
In addition here is an article from Machine-Knitting.net that explains how to trouble shoot your Brother KH930 Knitting Machine that will not turn on or has a no power fault issue:
Brother KH930 won't turn on white paper
What you can do on a Regular Basis
What you should not do to your Knitting Machine
• First check your needle retainer bar(sponge bar to most of us) to make sure it is not compressed or damaged. Replace if foam is not at least 3/8 inch above metal backing.
• Every row - same spot
• Random Locations
• Now and Then
Carriage hanging up or hard to push
Drops work off in lap while knitting
A Place for Knitting Machine Enthusiasts
Machine Damage - common problems
• Main Bed - look for the following
• Main Carriage
• Lace Carriage
Trouble Shooting Simple Issues
Faulty Pattern Selection
• Same place every row
• One side only
• Both sides