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Take the cover off and look at the cable that connects the tuner to the main board. Make sure it is connected straight and tight. Make sure all screws in the back are tight, just in case it is a grounding issue. Iff all checks out and you still have issues, replace your tuner.
If "CHECK SR TUNER" or "ANTENNA ERROR" appears in
the front panel display, the connection of the SiriusConnect
tuner or antenna is incorrect. In such cases, check the
connection of the SiriusConnect tuner and the antenna (see
• If "NOT SUPPORTED" appears in the front panel display, this
unit does not support the connected SiriusConnect tuner.
Or the SR Tuner is fluky. Refer to its manual and start over with IT as the product, not the Yamaha.
It's sounds like a chip gave up the ghost. You may want to try
turning in on and off a few times to see if you can get the culprit
to function properly again. Electronics are strange creatures in that you can at times just shake them and they will begin to function properly again. A loose wire here or there, instead of any real problem.
However, if the problem's more serious, given the cost of servicing these products, you may be better off just going to Ebay and buying a used one.
I recently purchased a nice used NAD 402 with original box
for $58. Upon arrival I found that the backlight to the digital display was not functioning, however the display itself was, and the sound of the tuner is amazing. It is nearly the equal of many tuners which I have owned in the past at as much as 50 times the price.
i have the same unit and a similar problem, after a fall of the tuner on the floor while i was cleaning my room, first times the st-x302l was powering fine but after some minuts it quit alone.. now (i dont know why) it remains on but if there is an interruption of electricity it dont turn on anymore, it turn on only by removing the metal chassis and moving random the electronics.. i think it has some electronic contact or circuit break.. i brought it to a specialist in electronics and he told me the reparation would be too expensive so i prefer to try fix it by myself.