I would tape the top of it in any case. I had a TX81Z that seemed unable to hold its memory despite various fixes to the (somewhat damaged) battery circuit, until I realised that the battery was simply shorting against the metal case lid and dropping the memory for that reason. When it came time to put a holder in my V50, I had to do the same thing – as the bottom of the case ended up pressing on the battery, which I had cheekily mounted on the solder side of the PCB, in order to make hypothetical future replacements a lot easier.id keep the battery in place with elctrical tape if youre putting it in a holder, so it wont get loose or fall out accidentally when moving the instrument
KingVidiot wrote:Also, what is the reset procedure? It's not in the manual.
Re: DX-21 no sound
by Clyde » Sat Dec 11, 2010 3:46 pm
Factory resets can correct issues sometimes. A failed battery will have to be replaced and then a factory reset done after the replacement. The Yamaha support FAQs are currently being updated and many FAQs are not coming up in the search. So here is how to enter the test modes which should do a factory reset. Any voices in RAM should be saved prior to reset and be reloaded after the reset. From "Ghost in the Machine" by Mark Davis from May 1989 Electronic Musician:
"DX21/27:Enter test mode by pressing voice buttons 1 and 2 while turning on the power. This will display the ROM version and date. Before proceeding to the next test, make the following connections: cassette out to the input of an amp, the amp out to the cassette in (set for 10dB gain), and connect Midi in to Midi out. Pressing the Yes button will begin the RAM, Midi, and I/O test. A missing or bad connection will cause an error connection. You can reboot at this point, the RAM will be initialized."
In the two or so years I had a DX21 in the mid '80s, I never did a factory reset (nor replaced the battery), so I have no real experience with this function. I personally think you have either an improper connection, bad cable, volume slider issue, and/or possibly the bad battery issue. Battery replacement is not a major issue, anyone handy with electronics repair can unsolder the old battery and solder in a new CR2032 3v lithium battery. You can purchase one with the solder tags already attached which keep you from having to solder directly on the battery, I pay $3.00-$4.00 US for them.
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