The jury in the trial of John W. Hinckley Jr. deliberated 4 1/2 hours yesterday and again failed to reach a verdict.

The jurors, who must decide the issue of Hinckley's sanity on the day he shot President Ronald Reagan, convened at the U.S. courthouse at mid-morning, after four of them had been escorted to a Protestant church service.

Meeting in the same courtroom where Hinckley's six-week trial was concluded Friday, the jury of seven women and five men worked through the lunch hour, eating sandwiches, potato salad and chocolate cake supplied by deputy U.S. Marshals.

Deliberations adjourned at 3 p.m., are scheduled to resume at 9 a.m. today. The jury has deliberated for a total of 16 hours.

Judge Barrington D. Parker issued an order allowing the jurors to have a 90-minute Father's Day dinner last evening with members of their immediate family or acquaintances. He ordered that all conversations be monitored by deputy marshals to ensure that there was no discussion of the Hinckley case.

The 12 jurors and six alternates have been sequestered at an Alexandria hotel for the course of their deliberations. The jury sent four notes to Parker on Saturday requesting a list of trial exhibits and other materials. No notes were sent yesterday.

The jury must consider 13 separate charges against Hinckley. The jurors must find Hinckley either guilty, innocent, or not guilty by reason of insanity.

Hinckley is charged with attempting to assassinate the president, assault with intent to kill Reagan while armed with a dangerous weapon, assault with a dangerous weapon and the use of a firearm in an attempt to kill the president.

Charges based on Hinckley's shooting White House press secretary James Brady are assault with intent to kill while armed and assault with a dangerous weapon.

Three charges involve Hinckley's shooting now-retired D.C. Police Officer Thomas K. Delahanty: assault with intent to kill while armed, assault with a dangerous weapon, and assault with a dangerous weapon on a police officer while on duty.

Hinckley, who used a .22 caliber pistol -- a classic Saturday Night Special -- in the shootings, also is charged with carrying a pistol without a license.

If convicted of the most serious charges against him, Hinckley would face five life sentences, one for attempting to assassinate the president and four for assault with intent to kill Reagan, Brady, Delahanty and McCarthy.

The jury has been instructed that if they decide to convict Hinckley on the four assault charges, they should not consider four less serious offenses included in the 13-count indictment against Hinckley.

Hinckley also would be subject to one to 10 years for use of a firearm in his attack on the president and up to 10 years for firing on a police officer while on duty. He faces 10 years, a $10,000 fine or both for assaulting federal officer McCarthy and one year or $1,000 or both for illegally carrying a weapon.

If Hinckley were convicted of the attempted on the president and sentenced to life in prison he would be eligible for parole review after 10 years. The parole date for a life term on the charges of assault with intent to kill is 15 years.

If Hinckley were convicted of all charges against him, his parole eligibility date could be significantly extended depending on Parker's sentencing decisions.

If Hinckley were found not guilty by reason of insanity he would be committed by the court to St. Elizabeths Hospital and confined there at the John Howard Pavillion for the criminally insane.

Within 50 days, the court would have to hold a hearing to determine whether Hinckley is no longer a danger to himself or others. If the court determined Hinckley still was dangerous, he would remain in the hospital but would have the right to ask for a rehearing every six months.

If Hinckley is found guilty on some counts but not guilty by reason of insanity on others, he would go to St. Elizabeths. If the court subsequently determined that he was no longer dangerous, Hinckley would then be sentenced on the guilty verdicts and sent to prison to serve out those terms.