Doepfer LMK2+ Midi Master Keyboard (old version without USB, no longer available) - Manual (Page 3)

LMK2+ User's Guide Page 3
1. POWER SUPPLY
The LMK2+ does not have a built-in power supply. Instead it uses a plug-in type external power supply (AC
adapter). One reason for this feature is electrical safety. Keeping danger voltages (main) out of the keyboard
increases the electrical safety. Therefore a external power supply of high quality and safety should be used. If
the keyboard is used in Germany the external power supply must be VDE approved.
Another reason for the external power supply is the fact that line voltages and plug types vary considerably from
country to country. Using a plug-in external supply the LMK2+ can be used any where with a locally purchased
power supply, thus keeping the retail price down.
The power supply must be able to deliver 7-12 VDC unstabilized voltage, as well as a minimum current of
200mA. The LMK2+ is switched ON by plugging the AC adapter into a wall outlet and connecting it to the
appropriate jack on the back of the keyboard case. There is no separate ON/OFF switch.
If the polarity of the power supply is incorrect, the LMK2+ will not function. However, there is no danger of
damage to the circuitry since it is protected by a diode. A power supply for 230V AC and European type plug is
included with the LMK2+. Any other type of power supply and must be purchased locally by the user.
If you are using the power supply shipped with LMK2+ you may find the pinout of the LMK2+ power jack in the
appendix B.
2. MIDI-INTERFACE
Connect the MIDI-OUT jack(s) of the LMK2+ with MIDI-IN of the device(s) to be controlled (i.e. Expander,
Sequencer, Synthesizer, etc.) via a suitable MIDI-cable. Both MIDI-OUTs are sending the same MIDI-signal. If
you want to control more than 2 MIDI devices you have to use daisy chain MIDI THRU/MIDI IN connection of
the devices ore use a external MIDI THRU BOX.
3. CONNECTION OF EXTERNAL PEDAL AND FOOT CONTROLLER
Located on the rear of the keyboard case are 2 jacks for connecting a single or double foot switch and a foot
controller. The jack for the switches is labeled SUSTAIN, the jack for the foot controller VOLUME. The two foot
switches have SUSTAIN (MIDI controller #64) and SOSTENUTO pedal function (MIDI controller #66). If a single
foot switch is used only the SUSTAIN function is available. A suitable foot switch is the DOEPFER VFP2.
If a foot controller is connected to the VOLUME jack it has volume function (MIDI controller #7). A suitable foot
controller is the DOEPFER FP5.
If you are not using VFP2 or FP5 you may find the pinout of the SUSTAIN and VOLUME jacks in the appendix B
as well as the type of potentiometer required for the foot controller.
The activity of the foot switches and the foot controller can be turned on or off for each keyboard zone
independently. For details see chapter 5.3.7 CONTROLLERS in this manual.
Do not connect the footswitches or the foot controller unless the LMK2+ is switched OFF. While power on the
LMK2+ electronics checks the levels of the foot switches and assumes that these levels are the "off" states. So
do not operate the foot switches while turning power on. This feature allows the use of foot switches with
contacts open at rest as well as those closed at rest. The foot switches and the foot controller are not included
with the LMK2+ and have to be ordered separately if required. The LMK2+ will work without the foot switches
and the foot controller, although the functions SUSTAIN, SOSTENUTO and VOLUME will not be available to the
user in that case.