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Marantz 3250 no headphone output

Hi folks,
I recently purchased a Marantz DC170 power amp and 3250 preamp. Everything seems to work well except that there is no headphone output. The speaker switching features may be the culprit as I have no user manual and may not have made the proper connections. Does anyone have familiarity with this unit? Thanks.

Re: Marantz 3250 no headphone output

The switching arrangement is shown on page 13 of the service manual. The switches for the main speakers have no effect on the headphone output. If there is no sound when you plug headphones in then it's either a problem with poor connections/faulty resistors on this board, or more likely the socket?