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MB6582 Control Surface Troubleshooting
MIDIbox - http://www.midibox.org/dokuwiki/
MB6582 Control Surface Troubleshooting
This section is about the MB6582 control surface trouble shooting based on the PCB version 2.0.
Please note that inappropriate working control surfaces may have a fault on the control surface PCB
as well as on the Base PCB. Therefore it is important to disconnect the CS PCB from the base PCB in
order to separate the root causes of the various possible faults.
It is also recommended to use this guide to verify the function of your control surface during the build
process. This will help you to identify faults early during the assembly process and will make you live
easier while testing the completed synthesizer.
The following acronyms are used in this section:
CS = Control Surface PCB = Printed Circuit Board
There are different root causes on the CS PCB leading to an inaccurately working control surface.
Please find an overview of the most common faults:
Shorts → caused by the midiboxer
Bad solder joints → caused by the midiboxer
Defective components (switchsed, LED, diods, encoders) → component manufacturing issue
Broken interconnection points (between the bottom and top side) → PCB manufacturing issue
Shorts or breaks on the boards → PCB manufacturing issue
The first step to do a successful trouble shooting is to understand the design of the CS PCB. Attached
you will find an overview of the usage of the connection pads between the CS and the Base PCB:
Please note that the all switches and all LED’s are sharing the same GND pad JD8 ! This is important
to understand because if you have shorts between JD8 tracks you will find that a series of switches or
LED’s are not working properly. In this case the MB6582 firmware will not be able to distinguish
between switches connected to the faulty tracks. Also all the LED’s connected to the faulty tracks may
light up together. It is also very helpful to understand that the encoders are using exclusively the
pads JD1 to JD4 as well as JD9 ! If you find encoders working inappropriately you just need to check
the rails on these pads.
The following steps are recommended to be carried out during the trouble shooting. Please make sure
that the CS PCB is NOT connected to the Base PCB !
Check of the single components:
