The NCAA postseason football committee has ordered the Cherry Bowl to pay the University of Maryland the rest of its $494,000 by June 30 or lose its certification, according to Maryland Athletic Director Dick Dull.

The Cherry Bowl, played in Pontiac, Mich., was expected to pay Maryland and Syracuse, opponents in last December's game, about $1.2 million each. Low ticket sales cut that to the $494,000 figure, on which the bowl and Maryland had agreed to a deferred payment schedule under which Dull said the university would have received about $130,000 next month and $70,000 annually for four years starting in 1987, besides what it already has received. But the NCAA committee ordered the payment in full by June 30 and ordered bowl officials to post a $1 million letter of credit, Dull said.

Dull said Cherry Bowl officials told him they expect to make the deadline . . .

Memphis State will accept a two-year probation from the NCAA and return almost $1 million in 1985 and '86 basketball tournament proceeds, school officials announced. "We don't really blame the NCAA," said Thomas Carpenter, university president. "We just had a difference of opinion." FOOTBALL

The NFL is investigating allegations that Irving Fryar of the New England Patriots, and possibly some teammates, bet on football games last season, according to The Boston Globe.

The newspaper's NFL sources said information on the alleged gambling was presented to Coach Raymond Berry a month ago, including evidence that Fryar had bet on games, and Berry forwarded what he had learned to Warren Welch, director of NFL security.

Welch confirmed there was an investigation, "but we [the NFL] never comment one way or another about any ongoing investigation." Berry would not comment. Fryar was unavailable.

No one would say it had been established without doubt that Fryar or any teammates had bet on any Patriots games.

Patriots General Manager Patrick Sullivan acknowledged the team had reported an "unsubstantiated rumor" to the league, "nothing more than that." . . .

In the USFL's antitrust suit against the NFL in New York, NFL Management Council executive Jack Donlan reiterated that he believes a Harvard Business School seminar in 1984 on "How to Conquer the USFL" was set up solely to deal with escalating player salaries -- not aimed at putting the USFL out of business.

He also was asked by USFL counsel about an August 1983 memo he circulated to his staff, entitled "How to Spend the USFL Dollar." It encouraged the NFL to go after low-salaried players and offer more lucrative future contracts as a way to escalate USFL payrolls.

"Each dollar spent on a current player is one they cannot spend on a draft choice," Donlan said in the memo. According to the NFL, the tactics suggested in the memo were never put into effect. Donlan said the NFL tactics might even have benefited the rival league, in effect, creating a salary cap . . .

Clinton Manges has agreed to pay nearly $700,000 in salary owed his former USFL San Antonio Gunslingers players, within 60 days, with 15 percent interest and $500 extra. BASKETBALL

Mike Schuler has succeeded Jack Ramsay as coach of the Portland Trail Blazers. Schuler, 45, assistant to Don Nelson at Milwaukee the past three years, once was VMI head coach and also served under Bob Knight at Army, Terry Holland at Virginia and Larry Brown with the New Jersey Nets . . .

Detroit Pistons guard Isiah Thomas underwent the first part of two-step surgery to repair damage to his left thumb . . . Seattle Supersonics center Jack Sikma has asked anew to be traded, to a more likely contender . . . The Miami City Commission is to vote today on whether to continue preparations to build a 16,000-seat downtown arena, which would set up a bid for an NBA expansion franchise . . . Danny Ferry led with 20 points as the U.S. entry weathered 49 by Lee Chung-hee and beat South Korea, 92-81, to lock up the William Jones Cup tournament in Taipei, Taiwan. The Americans went unbeaten in seven-team competition . . . Coach Denny Crum of NCAA champion Louisville reportedly has agreed to coach the U.S. team in the 1987 Pan American Games. COLLEGES

Trustees of the State University of New York have voted to allow campuses to grant athletic scholarships and upgrade their sports programs to major-college levels. For now, the move applies only to the University of Buffalo. But it might prompt other SUNY schools, all currently in NCAA Division III, to go for the big time, too. Of 64 campuses in the SUNY system, 29 are four-year centers. BASEBALL

Tom Gorman, Ed Vargo, Jim Honochick and Marty Springstead will umpire the fifth National Old Timers Classic June 23 at RFK Stadium. A National League roster change: Johnny Callison out, heart problem; Ed Kranepool in.