Human remains were also discovered at the seabed location, Mr Djamaluddin said.
The two-month-old boeing 737 MAX 8 jet plunged into waters 100ft deep just minutes after taking off from Indonesia's capital, killing all 189 people on board.
"We have our own laboratory and personnel team to do it", Haryo Satmiko, deputy chief of the transportation safety committee, told Reuters.
Indonesian officials have located the flight recorder from Lion Air flight JT610.
The flight data recorder gathers information about the speed, altitude and direction of the plane with enough storage for 25 hours of data, while the cockpit voice recorder keeps track of pilots' conversations and other sounds in the cockpit.
Relatives of those who had died questioned why the plane had been cleared to fly after suffering problems on its Bali to Jakarta flight on October 28 that included a rapid descent after take-off that terrified passengers.
The L3 Technologies Inc CVR was created to send acoustic pings for 90 days after a crash in water, according to an online brochure from the manufacturer.
A final crash report is not likely to be filed until later this year.
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They're built to survive at vast depths and in extreme heat, and are fitted with a beacon which can emit a signal for one month.
Investigators have now said that the plane was not airworthy, and should have been grounded.
Black box data help explain almost 90% of all crashes, according to aviation experts.
The main body of the aircraft has never been found.
It has now become Southeast Asia's biggest airline group by fleet.
The pilots appeared to struggle with an automated system created to keep the plane from stalling - a new feature of the Boeing 737 Max.
The plane's flight data recorder showed that pilots had repeatedly tried to correct its nose from pointing down, possibly after erroneous data from AoA sensors was fed into a system that automatically adjusts some of its movements.