By Don Clark and John Kell 

Qualcomm Inc. is facing some short-term turbulence as it waits for faster cellphone service to take off in China.

The San Diego-based chip maker reported Wednesday that second-quarter profit grew 5%. But its projections about the current quarter were less rosy than some analysts had expected amid signs that royalty payments associated with sales in China may be delayed.

Qualcomm's shares slid 5% in after-hours trading on the news.

Separately, Qualcomm disclosed that it may face Securities and Exchange Commission enforcement proceedings stemming from a bribery investigation into its dealings in China. The company said it doesn't believe it violated anti-bribery laws.

Qualcomm makes both processors and wireless communication chips used in smartphones, but it gets much of its profit from charging patent royalties to handset makers. The company has a commanding lead in products that communicate using speedy networks known by the designation LTE, a technology being rolled out this year by China Mobile Ltd., the nation's largest carrier.

Steve Mollenkopf, Qualcomm's chief executive, said he is optimistic about sales of LTE chips and additional royalty revenue from China. But he said proceeds from the licensing business--which Qualcomm records one quarter later--may come late in the 2014 second half.

"You are seeing some change in the shape of the year," he said in an interview.

Bill Kreher, an analyst at Edward Jones, agreed that Qualcomm should ultimately reap substantial rewards in China. But he added that the fact its revenue is "back-end loaded may cause some skepticism."

For the quarter ended March 30, Qualcomm posted a profit of $1.96 billion, or $1.14 a share, up from $1.87 billion, or $1.06 a share, a year ago. Revenue climbed 4% to $6.37 billion.

The company projected current-quarter adjusted profit of $1.15 to $1.25 a share on revenue of $6.2 billion to $6.8 billion. Analysts surveyed by Thomson Reuters expected $1.25 and $6.59 billion, respectively.

Qualcomm also raised its fiscal-year profit target, now seeing per-share earnings between $5.05 and $5.25, five cents above the earlier view. It reaffirmed its revenue outlook for the year.

In January 2012 the company disclosed a federal investigation into the company's compliance with the Foreign Corrupt Practices Act. It later said an internal investigation discovered instances in which special hiring consideration, gifts or other benefits were provided to several individuals associated with Chinese state-owned companies or agencies.

Qualcomm disclosed Wednesday that it received a Wells Notice in March from the SEC's Los Angeles regional office that indicates the staff has made a preliminary determination to recommend that the SEC file an enforcement action against the company.

A Wells Notice is not a formal allegation or finding by the SEC of wrongdoing or violation of the law, Qualcomm said, but it offers a chance for a company to offer reasons why no enforcement action is warranted. The company said it made such a submission to the SEC April 4.

Qualcomm, meanwhile, also faces an investigation in China for potential violations of anti-monopoly laws. The company, which disclosed that investigation in November, said it continues to cooperate with government authorities there conducting the probe.

Qualcomm has faced antitrust scrutiny before in countries that include South Korea and Japan. It is appealing adverse rulings in both countries.

In its regulatory filing Wednesday, Qualcomm said it understands that the investigation in China primarily concerns its licensing business and that unit's interactions with Qualcomm's chip business.

The company said the China National Development and Reform Commission, which is heading the investigation, could impose a broad range of remedies with respect to any business practices deemed to violate laws in China. Among other things, the agency could impose a fine in the range of 1% to 10% of the company's prior year's revenue, Qualcomm said.

Write to Don Clark at don.clark@wsj.com and John Kell at john.kell@wsj.com

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