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Tuner preset amnesia

qpagoda

qpagoda

Super Member
For the last three or four months my Denon TU-400 has been forgetting preset stations. I use a surge protector strip to turn the power on and off. From searching AK, I've read that some tuners use batteries to maintain memory. Somewhere in the past someone told me about dealing with a tuner or receiver that used a capacitor to maintain memory. I'm guessing that the amnesia results from a battery or capacitor problem.

As long as I turn the tuner on every day, it works fine. But, if I leave it off for a couple of days, it forgets everything.

Anyone know anything about the TU-400? Battery? Capacitor? Something else? Anyone know where to find the battery or capacitor in this unit?

Jon
 
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Try using the power switch on the unit. There may be a standby power supply that keeps the memory. If that isn't the answer, perhaps a battery needs replacing.

There is no substitute for a service manual; you should get one.
 
Gpagoda:

Had similar problem with a McIntosh tuner after it was taken out of long term storage.
Remove cover, you should see and recognize some form of battery(s). Mine had three
AA size rechargeable batteries in an aluminum clip. Mine popped out of the holder, ordered replacements,spent time cleaning corrosion from a couple of the terminals,installed new batteries, plugged tuner in.McIntosh suggest to charge with
tuner on for 24 hours. Will not charge with tuner turned off. Works like new. Hope this helps.
 
I'll open it up and look for a battery.

The tuner has been on the power strip for more than three years without any amnesia. This is a fairly recent problem. Even though I haven't turned the tuner on that often, the power strip it's plugged into is turned on several time a week.

I know I'll need a service manual for it sooner or later, but haven't had any problems with the tuner until now.

qpagoda
 
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