Question about Yamaha Dtxpress Iv Special Electronic Drum Set

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Problem with the Yamaha AW 4416: My AW 4416 is warning "LOW BATTERY", i want replace battery but i don't see it (I opened the board AW 4416). Please help me! Thank very much.

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  • taikhoanfree Apr 06, 2011

    Thanks a lot for your great comment "fredy2",

    Here is the detail of problem happen on my Yamaha mixer AW4416:
    Firstly, On the LCD screen always shows warning message "LOW BATTERY", it makes me confusing when working with this mixer.
    Secondly, all customization preset cannot save to memory: when I turn off and turn on the mixer, these values were reset to default values (not expected values)

    I want to confirm the sympton happened in your mixer,
    If the sympton is similar, I can order this chip and repair this mixer by myself,

    Looking forward to receive your reply soon,

    Thanks again,

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The "battery" MAY be a soldered in type.

Here is your service manual:

http://elektrotanya.com/yamaha_aw4416.pdf/download.html

Scroll down on the web page to "Get Manual" and download the manual.

The battery is on page 153 in the manual at grid N-10... you are NOT going to like this... it is in a Dallas Semiconductor real time clock chip... You have to replace the chip. It is IC709 which is a DS12887 chip.

The physical location can be found on page 58 about half way down the "A" sectioning line on the right side of the page. It is a 24 pin chip... It MAY be in a socket, or maybe not... PRAY !

Wow... $11.12 each from digikey.com

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=DS12887A%2B-ND

This info took me about 1 hour to dig out...searching for a battery was futile until I found the battery was related to the real time clock. If this isi soldered in, you need to have proper tools as the board is likely multilayer and takes care in solder removal... especially the new ROHS hi temp solders. You should take this to a board repair house if it is not socketed.

Posted on Apr 05, 2011

Testimonial: "Solution of fredy2 has 100% solved the problem I'd encountered, Highly appreciate his very quick support,"

  • 2 more comments 
  • taikhoanfree Apr 06, 2011

    Thanks a lot for your great comment "fredy2",
    Before replace IC709 in my mixer, I want to confirm the problem happened in your mixer is the same with my mixer first,

    Here is the detail problem happens on my mixer:
    On the bottom line of LCD always shows message "LOW BATTERY!!",
    Moreover, somtimes all customization preset values (in Automation Fader) cannot save after reboot mixer,

    If the problem is the same, I can order this chip and can repair this mixer by myself,
    Looking forward to receive your great comment/ solution soon,

    Thanks again,

  • Fred Yearian Apr 06, 2011

    I do not have the mixer myself, however I am an electrical engineer and have used the Dallas Semiconductor chips with embedded battery before. The chips, upon power being applied, first go into a mode that allows the firmware of the device they are used in to sample a bit of data that signals if the battery is becoming low. This sampling is ONLY done when power is first applied each time. I have used and programmed a product myself using these devices. This is the only battery in the mixer unit and is the cause of the message you are getting. Make sure you get fresh device so battery life is near full. The devices drain from the time they are made. The expected life at normal tempeatures should be 5 to 10 years. At higher temps they drain faster. Replace the chip and the message will disappear !!! Now about the customization values... The real time clock chip has some storage and they may time tag it with the RTC which could cause the loss of the values. MANY of the devices that store customized values do so in flash memory and those memories can develop problems, especially if power sequences down incorrectely. Changing the flash memory, IF it has a problem is not DIY as it requires specialized tooling. Following the procedure for shutdown is important and completing it each time is crucial to maintaining the values. Replace the IC709 chip and see if that will cure all the symptoms... I know it will fix the battery problem UNLESS there are major problems which I doubt are there if you can use the unit at all. Feel free to contact me email when you get the part replaced... the source I gave you usually has parts delivered to anyplace in the USA within 5 working days. Use care in handling the product and if in socket, make sure all the leads go in straight. The chips usually have the leads SLIGHTLY bent out for retentionwhen used as solder in, so CAREFULLY make the leads parallel before putting into a socket.

  • taikhoanfree Apr 10, 2011

    I'd ordered the similar chip (DS12C887+ instead of DS12887) and replace by myself,

    It worked like a champ,
    Great thanks for your quick support,

  • taikhoanfree Apr 10, 2011

    My email address is taikhoanfree@yahoo.com,
    Would you please send to me the contact info via this email?
    This will help me easier when I need your support if you don't mind,

    Thanks,

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You can replace the battery yourself in about 20 minutes. It is not soldered. You will need a replacement battery, which is a CR2032 watch battery, a small Philips screwdriver, and needle or thin-nosed pliers.
1. Remove all cables from the dtxplorer unit, and remove it from the drum kit rack.
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7. Just reverse the steps to reassemble, hook it up and you're ready to go. Easier to do than this makes it seem. Greg

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