Test Mode - Korg POLYSIX M Owner's Manual

12) PROGRAMMABLE NOISE GENERATOR
A WHITE NOISE noise generator is built on the MIDI pcb. Control is fully memorized with patches. It is switched
on when waveform sawtooth or pulse is selected and PWM SPEED is greater than "1". PWM SPEED acts also as
NOISE VOLUME control. The noise signal is AC coupled and fed to the VCO saw/pulse/sub osc. summing node of
each voice on KLM-366 via a 33k resistor. The noise is generated digitally by means of a looped shift register.
13) PROGRAMMABLE BEND WHEEL (optional, see modifications section)
When doing this modification, the BEND wheel can be switched to either bend the VCO (as with the original
Polysix) or to bend the VCF. This setting is stored along with each patch. The BEND INTENSITY pot is only active
in VCO mode. VCF bending mode is always full range.
14) PROGRAMMABLE MOD WHEEL
The MOD Wheel (and also MIDI Modulation IN) will follow the programmed LFO MODE switch. This means you
can select LFO MODE 'VCA' and MG LEVEL '0'. You then may add tremolo manually with the MOD wheel.
15) MODULATION PEDAL IN
You may modify the VCF fcM IN for an input for a modulation pedal (10k log):
• tip is -5V (via 1k safety resistor)
• ring is CV input
• sleeve is GND
Note: - The modulation pedal follows - like the modulation wheel - the programmed LFO MODE.
- The effect achieved by the mod pedal is available only locally; there is no control change command sent via
MIDI.

16) TEST MODE

(ONLY FOR SERVICE TECHNICIANS OR THE TECHNICALLY INTERESTED)
In the original Polysix there are two different test modes.
One is started by setting the switch on the KLM-367 circuit board in the TEST position and switching the front
panel TAPE ENABLE switch to the ENABLE position and then back to the DISABLE position. This is used to adjust
the programmer DAC.
The other test mode is started by jumpering pins DB7 and P17 using a diode (cathode towards DB7) on the
8049 processor on the KLM-366 circuit board (this can be done on the keyboard connector CN04). In this mode the
CV DAC is set to generate 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16' results in 0V, etc.).
This mode is used to check the CV DAC and is not described in the service manual.
In the Polysix M both these modes have been merged into one which performs both tasks. The test mode is
started in the following manner:
(1) Enter tape mode by switching the TAPE switch to the ENABLE position.
(2) Press 5, 6, 7, and 8 at the same time.
(3) Hold these four buttons and exit tape mode (TAPE DISABLE).
(4) The machine is now in the test mode and cannot be operated in the normal manner.
To adjust the programmer DAC it is still necessary to switch the KLM-367 switch to the TEST position.
To exit the test mode press A (or cycle power).
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