TOKYO, Jan 30 (Reuters) - Japan's Nikkei share average

reversed early gains on Friday and were on track for a second

straight weekly decline, as investors sold heavyweight

technology stocks to book ‌profit.

The Nikkei fell 0.85% to 52,923.12 by the midday

break after rising ​as much as 0.4% earlier in the session. It

was ‍down 1.7% for the week, but ⁠up 5.1% for ⁠the month.

The broader Topix slipped 0.25% to 3,536.26 on

Friday and was ‌on course for a ​2.6% weekly drop.

"Investors sold technology stocks to book profits today,"

said Takamasa Ikeda, a senior portfolio ⁠manager at GCI Asset

Management.

"The ‍yen ​weakened against the dollar, and that could be

positive for stocks, but these days those two assets' moves ‍are

not correlated."

Chip-testing equipment maker Advantest ( ADTTF ) fell 5.62%

after a seven-session winning run to drag the Nikkei the most.

Advantest ( ADTTF ) shaved 336 points off the Nikkei, which fell by 452

points.

Nomura Research tanked 15.87% to become the ​worst

percentage ‍loser on the Nikkei.

"The market scooped up stocks with strong outlook," said

Shigetoshi Kamada, general manager ​at the research department at

Tachibana Securities.

Casio Computer ( CSIOF ) jumped 14.8% to become the top

percentage gainer on the Nikkei, after the calculator maker said

its annual net profit might double.

Fujitsu ( FJTSF ) gained 3.56% after the computer maker

raised its annual net profit forecast ​by 93%.

Of the more than 1,600 stocks trading on the Tokyo Stock

Exchange's prime market, 47% rose, 47% fell and 4% traded flat.

($1 = ‍153.5500 yen)

(Reporting by Junko Fujita; Editing by Subhranshu Sahu)