The city council of the city of Pawtucket is authorized to provide, by ordinance, for the issuing and revocation in its discretion of licenses to all persons, partnerships, corporations, or establishments doing any repairs or repair work to any type of motor vehicle or motor vehicle parts, exclusive of auto body repairs, within the city of Pawtucket, subject to the listed conditions and restrictions contained in this chapter and for a term not exceeding one year; and also for charging and collecting fees for those licenses; provided, that the prescribed fees do not exceed the sum of one hundred dollars ($100) for any qualified licensee; and also to fix a penalty for doing motor vehicle repairs without a license or in violation of any ordinance or regulation made as authorized by this section, not exceeding for any one offense a fine of five hundred dollars ($500), or imprisonment not exceeding six (6) months.