The memory function for the FM tuner on my older Onkyo TX-28 is not working. It will hold the stations in memory while turned on and even if you turn it off and turn it back on. However, if you leave it off for a while it will loose the stored stations. Can I fix this fairly easily?
Replace super capacitor in the front board (C712) with part # 598-EDLF473A5R5C .47F 5.5V form Mouser Electronics. I did. It worked.
Thanks for the tips. My Onkyo TX-27 lost its memory years ago. The Super Capacitor was at the bottom. Had to remove the bottom cover, and also the front face plate (and a small circuit board containing a bunch of push button switches) in order to gain access. Then, it was easy to de-solder the Memory Backup Cap. I ordered the replacement. Fingers crossed. P.S. There were some typos in the previous posts. The capacitance is 0.047F (i.e. 47 millifarads, or 47,000 microfarads), and the number on the schematic is C712, not C172. I tried to upload a picture, but Fixya wouldn't let me. It was easy to find & download the Service Manual, which also helped.
FOUND IT!! Memory problems on a TX28 (and others I guess). There is no battery in these units (unlike computers). The guilty part is a capacitor called a Memory Backup Capacitor. I have a Onkyo TX28 and a Yamaha tuner with the same problems. As previously pointed out in earlier postings, it is part C172 in the TX28. It is a black polarized Cap that looks like a small drum, (like a button battery actually). The refs are 0.047 farads, 5.5 volts SUPER CAPACITOR. I took mine out of the TX 28 and it shows some leakage. It is on the top part of the front-end board. Is can be de-solded from the top (no need to remove circuit board, just the top cover). It costs about a buck fifty. Order online, replace and resolder.....VOILA......
regards
SKYFROG
My TX-28 has same problem. I will fix it by tossing it and getting a much better replacement .. not an Onkyo ... I've issues with two diff Onkyo products .. not again
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Same problem. When I program the radio tuner presets, they disappear when the power is turned off. The presets used to work. Unit was in storage for 4 years and now presets don't stay programmed after power is recycled.
The same problem is in my Onkyo TX-V940, it does not keep the preset stations, in both cases, AM and FM. It was working normaly but suddenly that function got lost.
I have the same problem with my Onkyo TX-28. I think it might be a battery somewhere in the unit - I took the cover off and looked but I couldn't find it. I thought it might be using a battery like a watch battery. Worked for years and in the last year or so stopped. Thanks
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