LMK2+/USB 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) or is powered via USB. 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 case
labeled
9V DC
•
or connecting the the USB connector of the LMK2+ via a suitable cable (A-B type) to a computer with USB
interface. The computer has to be able to deliver at least 200 mA current at the USB socket.
There is no separate ON/OFF switch. The following remarks are valid only if an external power supply is used
(i.e. the LMK2+ is not powered via USB):
One reason for the usage of an external power supply 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.
If an external power supply is used it 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+ if is purchased in Germany. Any other type of power supply and must be purchased
locally by the user. The pinout of the LMK2+ power jack is shown in the appendix B.
2. Midi-INTERFACE
The
Midi Out
socket is located at the rear panel. If the sound generation unit has to be controlled via Midi (e.g.
Midi Expander, Synthesizer, Sampler) this socket has to be connected to Midi In of the sound generation unit
via a suitable Midi cable. If only USB is used this socket remains unconnected.
3. USB Connector
The
USB
socket is located at the rear panel. If the sound generation unit has to be controlled via USB (e.g. a
computer with USB interface and suitable software) this socket is connected to the USB host via a suitable USB
cable (type A-B). As soon as the LMK2+ is connected to a powered computer via USB the power supply takes
place via USB and the external power supply (see 1.) is no longer required. The computer has to be able to
deliver at least 200 mA current at the USB socket. The USB interface transfers the same data as the Midi output
socket (see 2.).
4. 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 are labeled
Foot Switch
and
Foot Control
. 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
Foot Control
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
Foot Switch
and
Foot Control
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 6.3.7 CONTROLLERS in this manual.
Do not connect the foot switch 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.
