* BOJ announces tweaks to fixed rate fund supply scheme
* Central bank keeps rates on hold, no rise in bond purchases
* Forex and stock markets disappointed by BOJ decision
* U.S. seen easing more aggressively, weighing on dollar
By Masayuki Kitano
TOKYO, Aug 30 (Reuters) - The yen pared broad losses on Monday as the Bank of Japan's decision at an emergency meeting to expand a fixed-rate fund supply scheme disappointed investors looking for more aggressive easing measures to weaken the yen.
Market players expect the yen to rise to a new 15-year high against the dollar if expectations mount that the Federal Reserve will act to spur growth down the road, as the U.S. central bank stands ready to take more easing steps.
Fed Chairman Ben Bernanke said just that in a speech on Friday, although he downplayed concerns that the U.S. economy might slip back into recession. [
]"Bernanke's speech has clearly demonstrated that the U.S. now has an easing bias. Their easing could be more aggressive than the BOJ's," said Minori Uchida, a senior analyst at Bank of Tokyo-Mitsubishi UFJ.
"I think the yen will strengthen to around 80 yen by the end of year," he said.
Following an emergency policy meeting, the BOJ said it would increase the volume of funds to be offered in its fixed-rate fund supply operation to 30 trillion yen ($351.4 billion) from 20 trillion yen.
It also said it would offer fixed-rate loans to banks with a maturity of six months, and would keep its overnight call rate target unchanged at 0.1 percent. The central bank refrained from increasing its purchases of Japanese government bonds. [
] [ ]"The additional easing measures announced by the BOJ were only in line with market expectations and fuelled dollar-selling due to disappointment," said Masafumi Yamamoto, chief FX strategist for Japan at Barclays Capital.
If BOJ Governor Masaaki Shirakawa, in a news conference later on Monday, points to the possibility of shifting toward quantitative easing via steps such as increasing the amount of banks' current account balances at the BOJ, the market reaction could change, but that seems extremely unlikely at this point, Yamamoto said.
The dollar pared its gains against the yen to 85.38 yen <JPY=>, up 0.2 percent on the day but down from around 85.90 yen just before the BOJ's decision was announced.
The dollar slid last week to a 15-year low of 83.58 yen on trading platform EBS, hurt by worries that the U.S. economy may fall into a double-dip recession and falls in U.S. Treasury yields, as well as market perceptions that the Fed is more willing to take aggressive monetary easing steps than the BOJ.
Option-related yen-selling is also likely to keep the yen's advance slow beyond 85 yen, some traders also said.
Prime Minister Naoto Kan has also warned against the yen's rise, saying Japan monetary authorities could take all possible measures to tackle the soaring yen, making traders cautious about pushing up the yen too rapidly.
Still, many players believe Tokyo is likely to wait for the yen to rise around 80 per dollar before intervening in the market.
Any intervention is likely to be a unilateral action given the perception that neither the United States not Europe would be keen to help boost the value of their own currencies in light of weakness in their economies.
Japanese cabinet ministers were due to decide the basic thrust of additional measures to help the slowing economy at a meeting later in the day, though dealers expect little in the way of surprises to the markets.
With the BOJ and the government coming up with their responses, "this battle between the authorities and markets on the yen is entering its final stage, in which the market will test the authorities' resolve to intervene", said a dealer at a European bank.
The euro, which had risen to as high as 109.56 yen earlier, shed its gains and was little changed on the day at 108.78 yen <EURJPY=R>.
Against the dollar, the euro dipped 0.2 percent to $1.2739 <EUR=>.
The Australian dollar also slipped 0.4 percent on the day to 76.60 yen, dropping nearly a full yen from the day's high around 77.51 yen. (Additional reporting by Yoshiko Mori and Hideyuki Sano; Editing by Michael Watson)