Nad 7240 Tuner Alignment - diyAudio
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Old 11th February 2010, 01:27 AM   #1
diyAudio Member
Join Date: Jun 2008
Location: Canada
Default Nad 7240 Tuner Alignment

I have a NAD 7240. I just resurrected the tuner from the dead.

Now I notice a very slight "misalignment" between the tuner and the display. When looking for station 100.3, I find the station at 100.35, when looking for 102.9, I find the station at 102.95. This in itself isn't a huge issue for me but the digital tuner adjust in .05 increments and when tuned to 100.35 or 102.95, it still sounds like I am still slightly off the station. It appears as though the tuner is shifted across it's entire range by 0.03-0.04.

I have a service manual for a similar NAD receiver that appears to have an identical tuner. I (like most) don't have the necessary tools to do a proper FM alignment as described in the manual.

Obviously I don't want to make matters worse by experimenting with all the tuner adjustments. Can someone point me to the proper adjustment for shifting the aligning between the tuner and the display?
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Old 11th February 2010, 09:22 AM   #2
ke9oa is offline ke9oa  United States
diyAudio Member
Join Date: Jan 2010
Most of these tuners don't have a trimmer capacitor to adjust the reference oscillator for the synthesizer. The crystal has probably drifted.
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Old 11th February 2010, 01:51 PM   #3
diyAudio Member
Join Date: Jun 2008
Location: Canada
Here's a list of the adjustments that I can make according to the service manual:

-Tuning Voltage (Oscillator)
-RF Adjustment (Tracking)
-Detector Coarse Adjustment (only needed if detector repaired)
-Detector Final Alignment
-Autosearch Level
-Stereo Decoder, MPX Filter
-Synthesizer Frequency

Do any of them look like what I need?
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