Calibrating The Dacs - Clavia nord lead 2X Service Manual

Simple knob test
It is possible to perform a more simple test of the knobs than the one described in the
previous section. To perform the simple knob test, first make sure the power is turned
on, and then press [ SHIFT + LFO1WAVEFORM SELECT ]. This test does not keep
track on if all knobs have been tested, instead any knob can be turned in no particular
order. The knob position is shown on the LED display. This test can also be used to
display the position of the pitch stick and modulation wheel.
Checking the outputs
The Nord Lead 2X has the possibility to output a clean sine wave on each of the
outputs. This is not possible on the Nord Lead 2. To check the function of a single
output, first make sure the synth is on.
Enter performance mode by pressing [ PERF. MODE ]
and then press [ SHIFT + OSC KBD TRACK ].
This should output a clean sine wave on output A when pressing a key.
Toggle outputs by pressing the same button combination.
Exit the test by pressing [ PERF. MODE ].

Calibrating the DACs

The Nord Lead 2 is equipped with two stereo D/A converters running at 18 bits 44,1kHz
(U39 and U42). The DACs are calibrated with trim potentiometers (trimmers) at the
factory for lowest possible distortion. In some rare cases, it might be necessary to
perform a new calibration of the DACs.
First, read section "Opening the synth". Locate trimmers VR1-VR4 on the main board
(index corresponding to the respective output).
Play a program consisting of a single sine wave and trim until you hear no distortion.
The Nord Lead 2X is equipped with D/A converters that does not need to be calibrated.
Clavia DMI Service manual Nord Lead 2x rev. 1.1 Page 5