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My roland discover 5 wont tune - not to default 440Hz or any others - wont stabilize - and the bottom corner of touchscreen where it says"440 -Do it" for resseting to default concert pitch dowant work/ respond- and I havent been able to find a schematic( Besides playing, I'm also an Electronic tech- if had schematic could fix myself- Lee

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  • Roland Master
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The unit may have the problem that befalls the Palm Pilots where something gets under the escutcheon and presses on the touch screen at the edge which overrides any other inputs.

Another possibility is a stuck button. The buttons are usually scanned as a matrix and at startup if a button is stuck that can make unit unresponsive.

Without a logic analyzer and the firmware listing you likely would not get far if one of the logic chips has gone bad unless it can be found using freeze mist and heat gun..

Stuck buttons or touch screen is usually easily found without schematic.

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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The number stamped on the back of my piano is 57866 don't know the maker? any clue?


Jacob Brothers from 1921 according to the link shown:


https://www.mypianofriends.com/i-have-a-jacob-brothers-piano-model-number-57866-but-i-cant-find-any-infor...-107545.html

Quoting:

I have a Jacob Brothers piano model number 57866 but I can't find any infor... by Guest 5 days ago
9
I have a Jacob Brothers piano model number 57866 but I can't find any infor... I have a Jacob Brothers piano model number 57866 but I can't find any information on it? Anyone know anything regarding this model?
Posted on Questions & Answers
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4 days ago C. Anthony
Guru
Blogs: 48
Forum: 16,526
Votes: 420 What type of information do you want? you have the piano in front of you!
specifically what do you want to know?
the SN shows 1921 date.
Have you tuned it this year? If the piano will not hold tune to A=440hz, the value would be 0. However, I would think it would hold 440...but I may not.
Call your local piano technician to check it fully.
CAPReply

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My korg N364 is out of tune. how do i fix it?


hello sir,
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1 Answer

Pa 800 touchscreen keyboard problem. suddenly quit when playing. what's the solution ?


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1 Answer

I tune my guitars at 400 using a clip on tuner,which I believe is concert pitch I've recently bought a 5 string blue grass banjo .I set tuner to c mode to tune banjo is this correct


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Roland FP-8 replacement hammers do not match the original hammers


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HI, I have a Roland Juno GI, (5 months old), have not programmed anything into it or changed any settings. However, when I started it today it was flat by 50 cents. I was sure of this by checking a D or G...


It sounds like it is transposed. Look for the transpose function in your user manual. It shifts the keys by half notes either up or down. I would be surprised that factory reset would not clear the transpose setting. First, realize that these keyboards are controlled by a crystal oscillator and they just don't drift enough to shift even one cent worth.

IF the unit is NOT transposed, then the other problem is LIKELY with the pitch bend wheel. Try the action of the wheel and make sure it responds by moving up and down about 50 cents. If it doesn't go both ways, it is possible the mechanism has slipped or been damaged.

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1 Answer

HOW TO CALIBRATE KORG DT-10 TUNER TO 440 TUNING


From the user manual:

While the setting is shown in the display, press the CALIB key to

set the calibration.

Each time you press the key you will cycle through the following

settings.

0: 440 Hz 2: 442 Hz 4: 444 Hz 8: 438 Hz

1: 441 Hz 3: 443 Hz 5: 445 Hz 9: 439 Hz

When you have made the desired setting, wait approximately two

seconds without pressing the key.

The indication in the note display will blink three times, and the

calibration setting will be completed. You will then return to tuning
mode.

Just do it and stop on the 440 one.

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1 Answer

Roland E-20 tuning problems...


keyboard has internal battery. change it and it will retain memory of all settings + tuning. should'nt be too hard to dissasemble and get inside.

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