Like any other type of equipment, some dental equipment can be repaired on your own and some will need to be repaired by someone with experience. You can find many resources online to help you with either the repair or with finding someone to do the repair. There are even kits and classes available for you.

Find a Kit
You can find Dental Equipment Repair Kits for a reasonable price online which come with everything you need for specific repairs. This can help you do more of the repairs and maintenance on your equipment yourself instead of finding a professional. You could also take classes to help you learn how to do harder fixes or even when to know that it is cheaper to replace the equipment than to repair it. Unfortunately, because of how specialized and well-used this equipment is, it is usually better to repair it or to replace it with a used model.
Find a Professional
Finding a professional to repair your equipment can be an easier route than doing it yourself, but it can seem expensive. This is because the parts and education for dental equipment repair can also be pricy and you are paying for that level of experience over doing it yourself. Most of the time these repair personnel will have mentored under another pro or even taken classes to learn how the systems work and what common signs of needed repair are. It is a good idea to look for references for the pros you hire to see what kind of experience you are likely to have.
Repairing the equipment in your dental office can be easier than you think. You can either find kits or parts for common repairs and do the work yourself or you can find a professional in your area to do the job for you. Either way, it is a good idea to do a bit of internet research into the symptoms your equipment is showing before spending money on the problem.