A Montgomery County Circuit Court judge has sentenced a Gaithersburg woman to 60 weekend days in jail and 2,000 hours of community service for embezzling about $733,000 from her employer, Woodlawn Mechanical Contractors Inc.

Marian Margaret Donnelly, 33, was also placed on a five-year supervised probation, during which she must repay about $618,000 to Woodlawn. The other $115,000 that Donnelly owed the Gaithersburg company was recovered by seizing some of her property, said Suzanne Schneider, spokeswoman for the Montgomery County state's attorney's office.

Montgomery County Circuit Judge David L. Cahoon yesterday sentenced Donnelly, who was the controller at Woodlawn, to the maximum of 15 years, but suspended the sentence to all but 60 days, which she will be allowed to serve on weekends. Donnelly pleaded guilty in January to one count of theft over $300, according to Glen Ballenger, an assistant state's attorney involved with the case.

According to court documents, Donnelly converted company checks to her own use between December 1983 and March 1985 by making the checks payable to her father, R.M. Martin, and depositing them into an account held jointly with him.

Donnelly's father, who is in a nursing home, is believed to be unaware of the improper use of his name, according to court records.

Woodlawn's attorney, Robert A. Rorbaugh, said company President William L. Ray Jr. discovered the embezzlement after the Internal Revenue Service said Woodlawn owed taxes. The attorney said the company's checks to the IRS were diverted by Donnelly for her own use during the nearly two years she worked there.