Clavia Nord Lead 3 User manual

SERVICE MANUAL

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 1
Table of contents
Overview....................................................................................... 3
Test program................................................................................ 4
Running the test program ........................................................... 4
Error Codes ................................................................................ 6
Hardware ...................................................................................... 7
Hardware structure ..................................................................... 7
Opening the synth....................................................................... 8
Hardware configuration............................................................... 9
Calibrating the DACs .................................................................. 9
Software ..................................................................................... 10
Spare Parts................................................................................. 11

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 2
The Nord Lead 3 Service manual is arranged to help our service centers in the best way
possible. However the Nord Lead 3 user manual is a very useful guide, use it as a
reference in addition to this service manual. If you have access to internet you’ll find the
user manual available for download and also a lot of useful information on our website
www.clavia.se
I The information in this service manual is intended for service centers that repair
Clavia products. It may not be copied, reposted, modified, served from other web
pages, made into derivative works or distributed to other sources such as end users or
retailers that do not repair Clavia products.
h Important safety information
Dangerous voltage levels are present within the unit.
- Unit should be opened exclusively by qualified service personnel.
- Always disconnect the power supply cord before opening to avoid
electrical shock.
- Components and complete circuitboards may only be put into service when they
are securely fixed in the instrument casing.
Take necessary precautions against ESD before opening the unit.
Revision history
rev. 1.0 - First release.
rev. 1.1 - Added pictures.
- Layout changes
- Updated Hw / Sw section, overview section
- Added part list and error codes.

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 3
Overview
Product line
There are two different
Nord 3 Models:
- 4 octave keyboard version
- Rack version
Internal memory
The internal sound memory of Nord Lead/Rack 3 consists of 8 Banks (1-8) holding 128
programs each for a total of 1024 programs plus 2 Banks (1-2) holding 128
performances each for a total of 256 performances.
Fuse ratings
Voltage 115 V 230 V
Fuse 300 mA 125 mA
Physical Dimensions
Lead 3
W: 870 mm
D: 278 mm
H: 100 mm
Weight: 6,3Kg
Rack 3
W: 19”
D: 100 mm (incl feet and knobs)
H: 5 rack units
Weight: 3,3 Kg

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 4
Test program
Running the test program
The test program is stored in the BootPROM position U36. Test program version is
shown on the Lead / Rack 3 display when the test program is initiated.
If BootPROM version is older than 0.20, there is no test program available.
To find out which version that is installed, the Nord needs to be opened.
In order to trace a hardware error easier, each Nord synthesizer has a test program.
This program is primarily used in production in order to test all functions.
The functions provided by the test program allow a quick and easy search for possible
errors on the hardware. On the Nord Lead/Rack 3, the display guides the user through
the test program.
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I WARNING: Improper use of the test program or powering off the synth during a test
can result in malfunction of the synth. The test program may only be used by qualified
service personnel and is not intended for end users.
In order to execute the different tests on a Nord Lead/Rack 3, press and hold buttons
[ Synth + Store + Performance Mode ] at power up.
When test mode is entered a DRAM test is performed. The test progress is indicated by
the two middle segments of the pitch LED display.
After the DRAM test has finished successfully, the test program will start.
If any RAM error is found, 'Er' is shown on the LED display
Navigating through the test program
- Press the designated slot button [ A ] to [ D ] to enter a test group.
- Press slot button [ D ] When a test has finished, to exit the test.
- Press [ Navigator Up ] or [ Navigator Down ] to toggle between tests in a test group.
- Press [ Navigator Left ] or [ Navigator Right ] to toggle within a test.
- Press [ Active Device ] to start or reset a test.
A text guiding through the different tests should appear on the LCDs.

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 5
Available tests are:
MNB: Mainboard
1. RAM: Not applicable
2. Flash: Tests the Flash memory.
3. DAC: Outputs a clean sine wave on the outputs. Select output with the slot buttons.
Adjust volume with the dial encoder or the Master Level knob.
See section ”Calibrating the DACs” for more information.
4. MIDI: Tests MIDI communication. Connect a cable between MIDI in and MIDI out.
5. Pedal: Connect a sustain pedal to the sustain pedal jack to test its function.
6. Keyboard: Press one key at a time. Tests velocity response and counts the number
of keys pressed.
7. Serial: Displays the serial number.
LCD: LCD Board
1. Display: Test the LCD panel. Press [ Navigator Down ] to show all segments in LCD
2. Buttons: Press the buttons as indicated to verify their function.
3. Knobs: Turn the knobs as indicated. << indicates turning a knob fully
counter clockwise, >> indicates turning a knob fully clockwise.
Turning a knob too quickly requires restarting the test.
4. Dial: Turn the dial encoder in order to verify its function.
5. LED: Lights the LEDs in sections. Verify that each LED is lit.
6. Pitch Bend: Calibrates the pitch stick. After running the test, the display should show
a center value for the pitch stick.
PNL: Panel board
1. Buttons: Press the buttons as indicated to verify their function.
2. Encoder 1: Not applicable.
3. LED: Lights the LEDs in sections. Verify that each LED is lit.
4. Encoder 2: Turn the encoders as indicated. << indicates turning an encoder fully
counter clockwise, >> indicates turning an encoder fully clockwise.
Turning an encoder too quickly requires restarting the test.

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 6
Error Codes
Boot error codes:
E.0 Recv SysEx error (overflow or other low level error)
E.1 Recv begin error (SysEx begin message error)
E.2 Recv data error (SysEx data message error)
E.3 Recv end error (SysEx end message error)
E.4 OS erase error (can't erase OS in Flash)
E.5 OS write error (can't write OS to Flash)
E.6 No OS detected (no OS in Flash)
E.7 OS load error (OS with errors in Flash)
E.8 Flash init error (can't init Flash chip(s))
E.9 Flash unknown (unknown Flash chip(s))

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 7
Hardware
Hardware structure
The hardware structure differs in the rack and the keyboard version. Common for both
products are one power supply unit, one main board and one panel board.
The keyboard version has one type of LCD board (69072) with the pitch stick and
modulation wheel, while the rack version has another type of LCD board (69076) with no
pitch stick or modulation wheel. They also differ in size.
Power supply
The Nord Lead 3 is supplied with several different voltages from the power board.
These are +3.3V, ±5V and ±12V. For more information on where to measure these
voltages see the appropriate schematic. The Power supply is connected to the
main board with a 10 pole connector P2 (22480).
Main Board
The main board is equipped with six DSP´s U24, U27-U31 (21360),which is controlled by
a host processor U26 (213200) with two SRAM circuits U33 and U34 (21410) (128k*8 bits).
Boot code for the host processor and test program is stored in the BootPROM
U36 (23690). OS, user patches and performances are stored in a Flash memory U32
(21290) (8M*8 bits).
Audio D/A conversion is performed by U39 and U42 (21600).
A/D conversion of the control pedal takes place on the LCD board U8 (21580).
All input and output jacks are filtered from radio signals with an EMI-filter (23110)
(component designator prefix F). External connectors are a 26 pole connector for the
LCD board P3 (22520),a 20 pole connector for the panel board P4 (22500),a 10 pole
connector for the power supply unit P5 (22480),two keyboard connectors P1 and P2
(22670),one four pole connector for the after touch strip P6 (22550).
LCD Board
Main functions on the LCD board are the Lcd (20810), main encoder (22890), pitch stick
(10190) and connector for the modulation wheel P3 (22710). The LCD board is connected
to the main board with a 26pole connector P1 (22520)
Panel Board
On the panel board you will find 26 encoders (24010) and a number of status LEDs.
The panel board is connected to the main board with a 20 pole connector P1 (22500).

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 8
Opening the synth
WARNING: Take necessary precautions against ESD before opening the synth.
Nord Lead 3
Loosen the screws as shown in
the figure. (8x40018)
The two screws on the sides
work as hinges. Lift in the front
to open the top.
Nord Rack 3
Unscrew the 4 panel screws
(40018) Gently slide the top
forward and lift it of.
Picture shows Nord Lead 3
Removing the Power Supply Unit
Loosen the five screws (40262) holding the PSU to the chassis. Loosen the two screws
(40013) on the back panel next to the AC socket. Finally remove the 10 pole ribbon cable
(NL3 - 22390 NR3 - 22430) and lift out the PSU.
Removing the Main Board
Loosen the three screws (40262) holding the main board to the chassis. Loosen the nuts
and remove the washers around the ¼" jacks on the back panel. Also loosen the six
screws (40010) holding the MIDI jacks to the chassis. Remove the 26 pole ribbon cable
(22410) to the LCD board, the 20 pole ribbon cable (22400) to the panel board, the 10 pole
ribbon cable (Lead 22390 Rack 22430) to the PSU, the two ribbon cables (22290) to the
keyboard and the 4 pole after touch connector.
You can now lift out the main board.
Removing the Panel Board
Pull off all knobs (22900) on the front panel (not the buttons). Remove the ribbon cable
(22400) from the panel board. Loosen the last two screws (40018) holding the top to the
chassis. Loosen the nine screws (40262) holding the panel board to the upper lid.
You can now lift out the panel board.
Removing the LCD Board
Loosen the last two screws (40018) holding the top the chassis. Remove the LCD board
ribbon cable (22410). Disconnect the three pole modulation wheel connector. Loosen the
screws holding the pitch stick to the top. Loosen the screws (40262 Lead x6 / Rack x7)
holding the LCD board to the upper lid. You can now lift out the LCD board.

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 9
Hardware configuration
The N3 model (Lead, Rack) is decided by the LCD board. The keyboard version has
one type of LCD board (69072) with the pitch stick and modulation wheel, while the rack
version has another type of LCD board (69076) with no pitch stick or modulation wheel.
They also differ in size.
Hardware versions
Main board BootPROM Notes
ver. 1.10 v0.24c
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I Important notes
-The latest available OS version will work on all officially released main board versions.
However old OS versions might NOT work on newer main boards.
Always use the latest OS version!
Calibrating the DACs
The Nord Lead 3 is equipped with two stereo D/A converters U39 and U42 running at
18 bits 44,1 kHz. The DACs are calibrated with external 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.
To perform calibration first read section ”Opening the synth”.
- Start test Mnb/DAC as described in the “Test Program” section.
- Locate trimmers VR1-VR4 on the main board.
(index corresponding to respective output).
- Calibrate each DAC to lowest possible distortion.

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 10
Software
Uploading OS and sounds
The latest OS version for the Nord Lead/Rack 3 is available at
www.clavia.se
The software version is briefly shown on the LCD when you power up the Nord 3.
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I Important Update Note
To make sure you don’t accidentally overwrite Sounds or performances you want to
keep, it’s a good idea to back up the sounds. For information on how to back up
programs and Performances, please refer to the Nord Lead 3 User Manual
Factory presets
All factory programs and performance Banks are available as MIDI SysEx files for
download at www.clavia.se Please refer to the Nord Lead 3 User Manual for
information on how to restore the factory presets

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 11
Spare Parts
Mechanical:
Part no.
Item
22090 Cable 3pol mod.wheel
22460 Cable clip, adhesive
40081 Display window, red N3/N2X
40005 Keyboard 4 Oct. NL3
22290 Keyboard cable
22900 Knob D-form with grey line
40111 Lower lid Nord Lead 3
40113 Lower lid Nord Rack 3
40008 Modulation wheel
40056 Nut M3
40068 Pop rivet 3,2x8
23040 Pot. mod wheel N2/3/NM2
22390 Ribbon cable 10 pol NL3/NE61/73
22430 Ribbon cable 10 pol NR3/NER
22400 Ribbon cable 20 pol N2/3/dd4
22410 Ribbon cable 26 pol N3/NE/NM/NER
40070 Rubber foot 19mm
50172 Rubber pipe Mod wheeel
40262 Screw M4x6
40010 Screw, midi
40013 Screw, AC input
40040 Screw, keyboard NL3/Wood NE61/73
40025 Screw, modulation wheel
40026 Screw, pitch stick/upper lid
40018 Screw, upper/lower lid
40110 Upper lid Nord Lead 3
40112 Upper lid Nord Rack 3
40046 Washer BRB 4,3*9*0,8
Panel Board:
Part no. Item
69071 Panelboard Nord 3
20960 10uF/35V 5,0x6,0 Ellyt SMD
20980 100uF/16V 6,3x6,0 Ellyt SMD
20700 Diod Bav70 Sot23
20720 Diod Bav 56 sot23
21950 Transistor BCX53 Sot89 PNP
21940 74HC374 TSSOP
21930 74HC245 TSSOP
21920 74AC138 So16
21830 74HC138 So16
21810 74HC138 So16
20780 LED Eight
22500 Connector 20 pole
22030 Button black Nord/ddrum
22050 Button grey NE
24010 Encoder N3/NMG2 (Bourns)
20820 LED lens 15, N3/NM2
20830 LED lens shield 15, N3/NM2
22950 Knob neutral for N3/NMG2
20840 LED lens 6, N3/NE
20860 LED lens single, N2X/N3/NE/NM2
20850 LED lens shield 6, N3/NE

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 12
LCD board:
Part no.
Item
69072 LCD board Nord Lead 3
69076 LCD board Nord Rack 3
20960 10uF/35V 5,0x6,0 Ellyt SMD
20700 Diod Bav70 Sot23
20060 350ohm 0,1% 5ppm MK2
20200 Trim resistor, pitchstick
21930 74HC245 TSSOP
21940 74HC374 TSSOP
21810 74HC32 So14
21920 74AC138 So16
21580 Max1112 Cap 20ssop
21460 LF412CD SO8
21490 Op amp LMC662CM
20660 Pot.Cermettrim 10kohm SMD
10190 Pitch stick complete, short cable
22080 Cable pitch stick, short red + blue
40014 Screw, pitch stick/wood
40056 Nut M3
40088 Woodknob for Pitchstick
40159 Pitchbleck inkl.limning
20810 Display LCD NM/N3
40012 Screw, LCD display
40055 Nut M2,5
40059 Spacer 1mm nylon
20860 LED lens single, N2X/N3/NE/NM2
22520 Connector 26 pole
22740 Pin header 2x7pol
22710 Connector 3 pole, 90 deg.
22890 Rotary encoder
22880 Knob 21mm black N3/NM2
22940 Cover for 21mm knob
22030 Button black Nord/ddrum
22040 Button red Nord
Main board:
Part no. Item
69073 Main board Nord 3
20980 100uF/16V 6,3x6,0 Ellyt SMD
20960 10uF/35V 5,0x6,0 Ellyt SMD
20960 10uF/35V 5,0x6,0 Ellyt SMD
20970 47uF/35V 6,3x6,0 Ellyt SMD
20700 Diod Bav70 Sot23
23110 EMI-Filter 2,2nF,+50/-20% 100V
23100 EMI-Filter 470pF,+50/-20% 100V
21960 Transistor BCX54 Sot89 NPN
21970 Transistor BC847B Sot23 NPN
21950 Transistor BCX53 Sot89 PNP
21980 Transistor BC857B Sot23 PNP
23690 BootPROM N3, programmed
21520 Op amp LM833M
21480 LF353D So 8
21810 74HC32 So14
21360 DSP N3/NE/N2X
21940 74HC374 TSSOP
21320 Host N3/NE/N2X
21290 Flash NM/N3/dd4
21410 SRAM 1Mb N3/NE/N2X
21900 74LV08 So14
21730 74HCT32 So14
21600 DAC N/NM/Ne/dd4
21480 LF353D So 8
21570 PC 400TSo
21500 Resetcircuit N3/NE
20670 Pot.Cermettrim 50kohm SMD
23080 Crystal 32,768 KHz SMD
22600 Connector 1/4" Stereo
22590 Connector 1/4" Mono
22640 Connector din 5pol Midi
22610 Connector 1/4" Stereo/switch
22670 Connector 16 pole, micromatch
22520 Connector 26 pole
22500 Connector 20 pole
22480 Connector 10pol
22550 Connector 4 pole, after touch 90 deg.

Clavia DMI Service manual Nord Lead 3 rev. 1.1 Page 13
Power board:
Part no.
Item
69074 Power board N3/NE/N2X
69075 Power board N3 Jpn 100V
20910 Capacitor 4700pF X2
20950 10uF/63V 2m Elektrolyt
21020 3300uF/25V 85gr Ellyt axiell
20990 1000uF/40V 85gr Ellyt axiell
50061 Plastic strip black 200mm
20930 100nF/63V/10% 2m Polyester
20730 Diod 1N5404 3A
22840 Fuse house nord/dd4/mod
40076 Heatsink
23120 Drossel RN112-0,8/02
22620 Socket AC N3/NE
22480 Connector 10pol
22000 Powerswitch On/off
22020 Button grey power on/off
22630 AC-Switch
22780 Trafo N2X/N3/NE Eur/Usa
40017 Screw, keyboardNL2/transformer
21650 Regulator -3,3 BT
22960 Insulating insert TO-220
40042 Screw, regulator powerboard
40056 Nut M3
21660 Regulator -5Low
21680 Regulator +12V
21700 Regulator -12V
21690 Regulator -5V
40176 Plastic isolator
40180 Spacer 2mm Nylon
22790 Trafo N3 Jpn