Replacement of Green Contact Strip and Keys on the Roland JD-800

Replacement of green contact strip and keys on the Roland JD-800

A full video with all the procedures to disassembly the keybed and replace the contact strip.

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Roland JD800 - Red Glue - Key Weights Removal

Roland JD800 - Red Glue - Key Weights Removal


Tom Szakaly from the Noddys Puncture presents a short video he made of the removal of the weights from JD800 keys.
Basically it involves dissolving the red glue with Caustic Soda solution.
Please be careful though - if you do try this yourself, make sure to use goggles and gloves...!

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Great news! JD-800 flex circuit replacement!

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JD-800 and JD-990 DAC Calibration

This is my JD-800. The DAC board is at left.

JD-800 and JD-990 DAC Calibration

Calibration for the JDs Digital to Analog Converters (DAC).

Just to remember, the DAC is that circuit where the digital signal is converted to analog. This is a very important part of the JD, because the quality of the result it does.

From Analog.com:

In principle, you give a digital input to a DAC and it provides an accurate output voltage. In reality, the accuracy of the output voltage is subject to gain and offset errors from the DAC and other components in the signal chain. The system designer must compensate for these errors in order to get an accurate output voltage. This can be implemented with external components and post-manufacture trimming. Digital calibration modifies the input sent to the DAC such that the gain and offset errors are taken into account thus removing the need for external components and trimming.

Thanks to Don Solaris, a JD-Master for posting this at his site. Click the links to be redirected.

• JD-800 DAC Calibration

• JD-990 DAC Calibration

If you already does not have the JD Service Manual get it here: JD Manuals.


Note: Please, if the links does not work, notify me at comments to update it. 

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