TTM Technologies (TTMI) - Get Report was down 17.5% in late morning after Thomas Weisel Partners downgraded it to market perform from strong buy and cut its fiscal 2002 earnings estimate for the maker of printed circuit boards to 47 cents per share from 55 cents. Weisel cited increasing competitive pressures.

Weisel also lowered its rating on another circuit board maker,

Merix

(MERX)

, to buy from strong buy and sliced its 2002 EPS estimate to 40 cents from 60 cents, citing valuation. Merix was down 11.2%.