PK88 User's Guide V2 - Page 3
• Never use the instrument in the immediate proximity of interfering electronic devices (e.g. monitors,
power supplies, computers) since this could create disturbances within the instrument.
• The exchange of electronic parts (e.g. EPROMs for software update) is allowed only if the instrument is
disconnected from power supply.
• The instrument should only be shipped in the original packaging. Any instruments shipped to us for return,
exchange, warranty repair, update or examination must be in their original packaging! Any other deliveries
will be rejected. Therefore, you should keep the original packaging and the technical documentation.
• When using the instrument in Germany, the appropriate VDE standards must be followed. The following
standards are of special importance: DIN VDE 0100 (Teil 300/11.85, Teil 410/11.83, Teil 481/10.87), DIN
VDE 0532 (Teil 1/03.82), DIN VDE 0550 (Teil 1/12.69), DIN VDE 0551 (05.72), DIN VDE 0551e (06.75),
DIN VDE 0700 (Teil 1/02.81, Teil 207/10.82), DIN VDE 0711 (Teil 500/10.89), DIN VDE 0860 (05.89), DIN
VDE 0869 (01.85). VDE papers can be obtained from the VDE-Verlag GmbH, Berlin.
3. Power Supply
The PK88 does not have a built-in power supply. Instead it uses a plug-in type external power supply (DC
adapter). The connector is labeled „9V DC„ and is located next to the two MIDI sockets. The primary reason
for this feature is the fact that line voltages and plug types vary considerably from country to country. Using a
plug-in external supply the PK88 can be used anywhere with a locally purchased power supply, thus keeping
the retail price down.The PK88 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. There is no separate ON/OFF switch. PK88 sold in
Germany do include an AC adapter for 230V mains supply.
In other countries the power supply is NOT included with the PK88 and must be purchased locally by the
user. The power supply must be able to deliver a voltage of 7-12 VDC (unstabilized), as well as a minimum
current of 100mA.
4. MIDI Connectors
Next to the power supply connector you will find the two MIDI connectors labelled "MIDI-Out". On both
connectors the same MIDI data are available. Connect one of both outputs with MIDI-IN of the device to be
controlled (Expander, Synthesizer, Sampler) via a suitable MIDI-cable. If you want to control a second device
with the same MIDI data you may use the second MIDI output or you link the devices via MIDI THRU/MIDI IN.
5. Connection of the Foot Switch
Located on the rear of the keyboard case is a jack for connecting a single or double foot switch. Do not
connect the footswitch unless the PK88 is switched OFF. The two foot switches have SUSTAIN (MIDI
controller #64) and SOFT PEDAL function (MIDI controller #67). If a single foot switch is used only the
SUSTAIN function is available. A suitable double foot switch is e.g. the DOEPFER VFP2.
There are two types of foot switches available: "contacts open at rest" or "contacts closed at rest". The
factory setting of the PK88 is for "closed at rest" (suitable for our VFP2). If you want to use a single or double
foot switch "open at rest" you have to modify the setting for the foot switch type (see appendix:
modifications).
Please pay attention that some MIDI expanders do not support the MIDI controller #67 (Soft pedal). Sustain
(#64) is recognized by nearly all expanders. Please refer to the user's guide of the expander used if both
controllers are supported.
The double foot switch is not included with the PK88 and has to be ordered separately if required. The PK88
will work without the double foot switch, although the functions SUSTAIN and SOFT PEDAL will not be
available to the user in that case.
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