Doepfer Wheel Electronic - Manual (Page 14)

Page 14 Wheel Electronic V1.0 User's Guide
Check list
In case that your WE installation does not work at the first go please check the following points:
• Does the power supply work correctly ?
• After power on the LED has to turn on ! Otherwise the AC adapter used is not suitable, has
the wrong polarity, voltage or current, or does not work. The correct polarity is: outside ring =
GND, inside lead = +7...12V.
• Are the controls connected correctly as described in this manual ?
• Is the right Midi channel selected with the jumpers 1…4 of JP1 ?
• Is the right preset number selected with the jumpers 5…8 of JP1 ?
• Is the right voltage range selected with the jumpers jumpers of 1...4 JP2 ?
• Are unused analog inputs connected to GND or +5V (or jumpered correspondingly directly at
the pin headers ST1…ST4) ? When the LED is flickering permanently without operating one
of the controls probably one of the four analog inputs is left open !
• If inputs jumpered for the reduced voltage range seem to work not as they should (e.g.
permanent data transmission or no data transmission) check if the voltage V+ adjusted with
P1 is more than +3V. With reference voltages below +3V the a/d converters do not work
properly.
• Is the LED flickering if incoming Midi messages appear at the Midi In of WE (e.g. from a
keyboard)?
• Was no short circuit made (neither in the wiring nor mounting) ?
• If the diode D3 and the voltage regulator IC3 become hot probably a short circuit between
GND and +5V was made !
• If momentary or toggle switches are used at the analog inputs ST1…ST4: are the 10k
(4k7...100k) resistors soldered accordingly?
• Are the Midi connections between WE and the other Midi devices installed correctly ? Midi
Out of WE has to be connected to Midi In of the Midi device controlled by WE. Especially
when computers are used Midi In and Out are very often mixed up by the user. Once again:
Midi Out
→ Midi In (not Midi Out → Midi Out nor Midi In → Midi In).
• Please use only cables that are suitable for Midi.
• When a PC with sound card is used only high quality multimedia cables should be used. Low
cost multimedia cables without optocouplers for Midi In and without drivers for Midi Out very
often cause Midi data problems.