Behringer D A-440 Installation instructions

Synthesizers and Samplers

MODEL D

Authentic Analog Synthesizer with 3 VCOs,

Ladder Filter, LFO and Eurorack Format

985-40000-01103 Rev.A

2021-02-03 page 1 of 23

Condential, for internal use only. Not to be reproduced.

1. Small insulated trimpot screwdriver

2. Small Phillips screwdriver

3. A at sheet of cardboard or other insulator as wide as the MODEL D. (This will help prevent damage to the top panel when it is

inverted and resting on the bottom chassis)

The following equipment is required for the Oscillator adjustment and Octave Range adjustment:

1. An external MIDI keyboard of at least 3 octaves including A2 and C6

2. MIDI cable

3. Pair of headphones or a sound system to monitor the main output

The following equipment is required for the Pitch CV adjustment:

1. Digital DC Voltmeter with a scale that can display accurately to 0.001 V

2. Laptop or desktop computer previously loaded with and running a MIDI utility that can send SysEx commands

to the MODEL D

3. USB type A to USB type B connection cable

User Support Bulletin

Introduction

The unit is carefully calibrated at the factory. The performance may change over time or due to environmental changes,

and the following recalibration procedures will help bring it back to its factory settings. If you do not feel comfortable doing

these calibrations, then we recommend they are done by an experienced audio service technician. This is especially true for

those units that need to be opened to gain access to voltage test points and calibration potentiometers.

CAUTION: Incorrect calibration or damage to the delicate adjustment potentiometers may lead to the unit

becoming inoperable.

Note: Although re-calibration will not invalidate the warranty, any damage caused during re-calibration may invalidate

the warranty.

Equipment required

Synthesizers and Samplers

MODEL D

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Calibration Procedure

The main printed circuit board (PCB) of the MODEL D has various test points and miniature potentiometers (trimpots) that allow

the various calibration and adjustment procedures to be carried out. This involves lifting up the front panel to allow access to the

bottom side of the PCB.

Three main calibrations can be carried out:

1. The PITCH CV can be calibrated using a computer to send a SysEx command, an external keyboard, and a digital DC voltmeter.

See PITCH CV Calibration.

2. The oscillators can be calibrated using a guitar tuner or the internally-generated A-440 concert pitch, and an external

keyboard. See Oscillator Calibration.

3. The Octave RANGE can be calibrated using an external keyboard. See Octave Range Calibration.

A-440 Reference

The MODEL D A-440 pitch is generated and regulated by the MCU and there is no adjustment required. This set frequency is

used as a reference in the following procedure to calibrate OSC1.

Important Note about Reset

If you have previously adjusted the MIDI IN Transpose or MIDI Note Zero Volts, you MUST reset the MODEL D to its factory

settings before doing the following procedures.

Preparation

Before doing the PITCH CV calibrations, become familiar with, and practice the procedures for sending SysEx

commands to the MODEL D. In this way, you will spend less time with the calibrations.

Synthesizers and Samplers

MODEL D

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Connect the MIDI output of an external keyboard to the MIDI IN connector of the MODEL D.

Connect the external power supply adapter to the rear power input of the MODEL D.

Connect a laptop or desktop computer to the MODEL D USB input. (This is only required if you are doing the

PITCH CV calibration, or doing a Reset.)

Connections

Follow all steps in the order in which they are presented.

The diagram below shows the typical connections for this procedure.

Preliminary Procedure

*Headphones

Power

Adapter

MOTŌR49 MIDI Keyboard/Controller

MIDI OUT

*Active Loudspeaker

*Use Headphones or a Loudspeaker

to listen to the output during

the Oscillator calibration

MIDI IN

Laptop or desktop computer

running a MIDI Utility

to send SysEx messages

(for PITCH CV calibration)

USB B

USB A

Synthesizers and Samplers

MODEL D

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MODEL D Control Settings for Calibration

KNOBS

TUNE 0

GLIDE 0

MOD MIX *

MOD DEPTH 0

LFO RATE 0

SWITCHES

OSC3/FILTER EG *

NOISE/LFO *

SQR/TRNG *

* NO PREFERENCE

KNOBS

OSC1 RANGE 8’

OSC2 RANGE 8’

OSC3 RANGE 8’

OSC1 WAVEFORM SAWTOOTH

OSC2 WAVEFORM SAWTOOTH

OSC3 WAVEFORM SAWTOOTH

OSC2 TUNE 0

OSC3 TUNE 0

SWITCHES

OSCILLATOR MOD OFF

OSC3 CONTROL ON

KNOBS

OSC1 VOLUME 10

OSC2 VOLUME 10

OSC3 VOLUME 10

EXT IN VOLUME 0

NOISE VOLUME 0

OSC1 SELECT ON

OSC2 SELECT OFF

OSC3 SELECT OFF

EXT IN SELECT OFF

NOISE SELECT OFF

SWITCHES

WHITE/PINK *

* NO PREFERENCE

KNOBS

MAIN VOLUME *

PHONES VOLUME *

SWITCHES

MAIN OUT *

A-440 ON

* VOLUME AS NEEDED

KNOBS

CUTOFF FREQ 5

FILTER EMPHASIS 0

AMOUNT CONTOUR 0

FILTER ATTACK 0

FILTER DECAY 0

FILTER SUSTAIN 0

LOUDNESS ATTACK 0

LOUDNESS DECAY SEC

LOUDNESS SUSTAIN 10

SWITCHES

FILTER MODE LO

FLTR MODULATION OFF

KEYBRD CONTROL1 OFF

KEYBRD CONTROL2 OFF

FILTER DECAY OFF

LOUD DECAY OFF

EXTERNAL KEYBOARD

MOD WHEEL DOWN

PITCH WHEEL CENTERED

Turn o the MODEL D power.

Try and do the following steps quickly and carefully to keep any cooling down to a minimum.

Lifting o the top panel

Turn on the MODEL D rear panel power switch and check that its Power LED comes on.

Important: Leave the MODEL D turned on for approximately 30 minutes. This will allow the circuits time to warm up

and the components and performance to stabilise with temperature. Without this warm-up time, the calibrations will

be inaccurate.

Set the MODEL D controls as shown below.

Turn down the MODEL D headphone volume knob, and connect your headphones to the MODEL D headphones

output connector. Alternatively, you can monitor the MODEL D output using the main outputs and a suitable sound

system and speakers.

Synthesizers and Samplers

MODEL D

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Carefully lift the top panel assembly and turn it over so the PCB is facing upwards. Be careful not to pull on the two

cables from the lower side of the main PCB. As your connections to other equipment are still in place, take care not to

pull out any cables or damage them.

Place a piece of cardboard or similar insulator between the controls and the main chassis. This will help prevent

damage to the controls as you lay the top assembly onto the main chassis. To protect the wooden side panels from

being scratched, you can add some protective tape over the top edge of each side panel.

Make sure that the top panel is in a secure position and that it is not liable to be dropped or damaged, or become

disconnected with its internal cables or the MIDI cables or headphone cable.

Double check that the MODEL D controls are still as shown on the previous page, in case they were moved during the

top panel removal.

Because the main PCB is exposed, make sure you are not touching it, and that it is not touching any metal work that

may cause a short-circuit.

Turn on the MODEL D rear panel power switch and check that its Power LED comes on.

Do not turn o the MODEL D or let it cool down, until all the calibrations are completed.

Take care not to

pull on these cables

Carefully undo the 8 screws on the top panel as shown. There is no need to undo any other screws.

Synthesizers and Samplers

MODEL D

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If the A-440 switch is in the ON position, you should hear the tone in your heaphones or main system if you carefully

bring the headphone volume or main volume up.

Now that everything is ready, inspect the bottom surface of the PCB as shown on the next page.

The diagram below shows the Test Points TP1 and TP2 used in the PITCH/CV calibration. Take a look at the PCB and locate these

two test points.

The diagram below shows the adjustment trimpots that are used in the Oscillator and Octave range calibration procedures. Take

a look at your PCB and locate these various trimpots. (The later version of the PCB uses dierent multi-turn trimpots.

DC Voltmeter

Voltmeter

0.001

Synthesizers and Samplers

MODEL D

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OSC3 Scale Adjustment

OSC3 Range Adjustment

Octave Adjustment

OSC1 Scale Adjustment

OSC1 Range Adjustment

OSC2 Range Adjustment

OSC2 Scale Adjustment

Highest A5

Lowest A2

Highest C6

PITCH CV Calibration

The PITCH CV calibration procedure uses a computer MIDI utility to send a SysEx command to the MODEL D to put it into

calibration mode.

Once in calibration mode, a digital DC Voltmeter is used to measure the voltage at a test point while test notes are played using

the external keyboard.

The meter should have a resolution of 3 or more decimal places, for example 0.001 V.

Synthesizers and Samplers

MODEL D

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Run MIDI OX on your computer, and go to OPTIONS/MIDI DEVICES.

Select the MODEL D as the MIDI IN and MIDI OUT.

The following example shows the use of the popular MIDI Utility “MIDI OX” to send a SysEx message from your computer to

the MODEL D to put it into PITCH CV Calibration mode. (This same procedure can be used to send any SysEx message to the

MODEL D.)

Putting the MODEL D into Pitch CV Calibration Mode

Synthesizers and Samplers

MODEL D

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Select "Pass SysEx" at the bottom of the Options pull down menu. (It might already be ticked, which is ne.)

In the VIEW Menu, select SysEx..

Synthesizers and Samplers

MODEL D

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In the Command Window, enter the SysEx command to be sent to the MODEL D. For PITCH Calibration, the

command is:

F0 00 20 32 00 7F 0E 00 00 00 F7

In the Command Window drop-down menu, select Send SysEx.

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