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Nad 7240 Tuner Alignment

S

seabass23

New Member
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 aligning the tuner to the display?
 
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You probably only need to adjust the discriminator zero. Probably, two test points, you would need a multimeter to adjust the transformer of 0 volts as described in the manual.
 
I don't see the word "descriminator" in the manual. I'm looking at the list of adjustments and here's what they have:
-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

I do have a good quality multimeter but still not sure which adjustment I need to be making.

When the manual suggest using an FM generator, can I just tune to a known strong FM station?
 
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