Rev. 1.0 2005-06-10 Page 1/5 Nord Electro 2 Service Manual Revision history Rev. 1.0 First release. Overview There are three different Nord Electro 2 models: - 61 note keyboard version - 73 note keyboard version - rack version Uploading OS and sounds The operating system and sampled sounds are stored in FLASH circuits on the main board. For information on how to update the OS and uploading sounds, visit www.clavia.se. Click on Products/Nord Electro 2 and then choose either ”free software” or ”free sounds”. Returning to factory settings It is not possible to return to factory settings without connecting the Nord Electro to a computer. Once connected, you can dump the factory settings and the latest OS. Visit http://www.clavia.se for details. Running the test program The test program is stored in an EPROM located in position U17. If the version is older than 0.20, there is no test program is available. To find out which EPROM version that is installed, the Nord Electro 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. However, any user can access the test program by holding down certain buttons at power up. The functions provided by the test program allow a quick and easy search for possible errors in the hardware. Test results are shown on the Electro’s display. If a test is successful, the display reads ”rd”. If errors are detected, en error code is shown in the display. The error codes are listed under the section ”Error codes” at the end of this document. Rack version 63 note keyboard version 73 note keyboard version
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Rev. 1.0 2005-06-10
Page 1/5
Nord Electro 2 Service Manual
Revision history
Rev. 1.0
First release.
Overview
There are three different Nord Electro 2 models: - 61 note keyboard version - 73 note keyboard version - rack version
Uploading OS and sounds
The operating system and sampled sounds are stored in FLASH circuits on the main board. For information on how to update the OS and uploading sounds, visit www.clavia.se. Click on Products/Nord Electro 2 and then choose either ”free software” or ”free sounds”.
Returning to factory settings
It is not possible to return to factory settings without connecting the Nord Electro to a computer. Once connected, you can dump the factory settings and the latest OS. Visit http://www.clavia.se for details.
Running the test program
The test program is stored in an EPROM located in position U17. If the version is older than 0.20, there is no test program is available. To find out which EPROM version that is installed, the Nord Electro 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. However, any user can access the test program by holding down certain buttons at power up. The functions provided by the test program allow a quick and easy search for possible errors in the hardware. Test results are shown on the Electro’s display. If a test is successful, the display reads ”rd”. If errors are detected, en error code is shown in the display. The error codes are listed under the section ”Error codes” at the end of this document.
Rack version
63 note keyboard version
73 note keyboard version
Rev. 1.0 2005-06-10
Page 2/5
WARNING: Improper use of the test program can result in malfunctioning of the synth. It 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 Electro 2, press and hold <program 1+3+5> at power up. All LEDs and the display should now be lit. After finishing each test successfully, the test program jumps forward to the next step. The active test is shown in the display. To toggle manually between tests, press <shift + up> or <shift + down>.
Checking the LEDs and buttons
Press all buttons to switch off the LEDs. Once switched off, they can not be switched on again without restarting the test. Switching off all LEDs makes the test jump forward to the next stage.
Checking the knobs
Turning a knob from fully counter clockwise to fully clockwise should generate a value between 0 and 7F, respectively. The value is shown in the display. It should change linearly with the potentiometer travel. Turning each knob fully counter clockwise to fully clockwise makes the test jump forward to the next stage.
Checking the keyboard
Press one key at a time to check its function. If a ”note on” message from that key is detected, the display counts up one step. When all keys are pressed, the test jumps forward to the next stage. This test does not report velocity response.
Checking the pedal inputs
Connect a sustain pedal to the sustain pedal input, a switch pedal to the Rotor speed input and a control or volume pedal to the Control pedal input. Pressing and releasing the sustain pedal should generate values 0 and 7F, shown in the display. This applies to the Rotor speed input as well. Rocking the control pedal back and forth should generate values
between 0 and 7F, shown in the display. For Yamaha control pedals, you have to switch the tip and ring signals for the pedal to work properly with the Electro 2. See this document: http://www.clavia.se/nordelectro/fc7_modification.htm. To make the test jump forward to the next stage, unplug all pedals and then reconnect and unplug the control pedal.
Checking the DAC
This test should output a clean sine wave on the left (d1) and right (d2) outputs. Toggle the output with <STORE>. Adjust the volume with the volume knob. If the output is distorted, try adjusting the trim pots found in the lower left corner of the main board (VR2 for left output, VR1 for right) with a non conductive (ceramic) screwdriver.
Rev. 1.0 2005-06-10
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Hardware structure
The hardware is common for all three products; one power supply unit, one main board and one panel board.
Power Supply
The Nord Electro is supplied internally with several different voltages. These are +3.3 V, ±5 V and ±12 V. For more information on where to measure these voltages, see the schematic for the power supply. The fuse should be 300 mA for a 115 V and a 100 V supply, and 125 mA for a 230 V supply.
Main board
The main board is equipped with four DSPs (U16-U19), which are controlled by a host processor (U14) with two RAM circuits (U9-U10, 128k*8 bits each). The code for the host processor is stored in an EPROM (U17). OS and sampled sounds (all sounds except organ) are stored in four FLASH circuits (U1-U4, 4M*16 bits each). Audio D/A conversion is done by U20. A/D conversion of the control pedal takes place on the panel board (see schematic for details). All input and output jacks are filtered from radio signals with an EMI-filter. External jacks are a 26 pole connector for the panel board, a 10 pole connector for the power supply unit and two keyboard connectors.
Panel Board
On the panel board you will find all control functions of the Nord Electro. It is also on the panel board that the model of the Nord Electro is hardware configured. See section ”How to configure keyboard or rack version” for details. The panel board is connected to the main board with a 26 pole ribbon cable. It is through this cable the panel board gets its current supply.
How to detach the circuit boards
WARNING: Take necessary precautions against ESD before handling the circuit boards.
Opening the synth
Keyboard version: Loosen the screws as shown in the figure below. Lift the front of the wooden ends to open the top.
The picture shows which screws that should be removed on a Nord Electro 73 key version. For the 63 key version, the two screws close to each other at the top of the picture does not exist.
Rev. 1.0 2005-06-10
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Rack version Loosen the two screws on the back side and the two screws on the front side that holds the top to the chassis. You can now lift off the top.
Removing the Power Supply Unit
Loosen the five screws holding the PSU to the chassis. Loosen the two screws on the back panel next to the AC inlet. Finally remove the 10 pole ribbon cable connector and lift out the PSU.
Removing the Main Board
Loosen the four screws 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 four screws holding the MIDI IN and OUT jacks to the chassis. Remove the 26 pole ribbon cable connector to the panel board, the 10 pole ribbon cable connector to the PSU and the two ribbon cable connectors to the keyboard. You can now lift out the main board.
Removing the Panel Board
Pull off all knobs on the front panel (not the buttons). Remove the ribbon cable connector from the panel board. Loosen the last two screws holding the top to the chassis. Loosen the nine screws holding the panel board to the top. You can now lift out the panel board.
How to configure keyboard or rack version
The model of a Nord Electro (61, 73, rack) is decided by two 0 (zero) ohm resistors (R50, R51) found in the lower left corner of the panel board. In order to reach the resistors, the panel board needs to be detached. If the panel board is not properly configured, you get problems like: - High notes trig low notes or notes are trigged randomly. - Keyboard not working at all. - Buttons affect other parameters. The configuration scheme is: Zero ohm resistor in position R50 R51
Electro 61 No No Electro 73 Yes No Electro rack No Yes
The picture to the right shows how a panel board for a Nord Electro 73 key version should be configured.
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Updating the software
The software version is briefly shown in the display when you power on the Nord Electro/Electro 2. For more information on how to update the software, visit http://www.clavia.se.
Known or common errors
Many of the errors that occur can be related to the improper use of the synthesizer. Before it can be established that a hardware error has occurred, check the manual and the FAQ on www.clavia.se for information. In some cases an error can be cured by updating the software. See www.clavia.se for more information on how to update the software. If the possibility of a software error can be excluded, check the following: - Is the fuse blown? Many times the problem can be as simple as that. Also check the power rating on the back panel to make sure that it complies with your country. - Does all voltages appear on the power supply unit/main board? For information on where to measure the different voltages, see the schematic. - Is there a bad connection? Check all ribbon cables and connectors to see that they are fixed in their respective positions. - Is there a bad solder joint? A bad solder joint might be difficult to discover on surface mount components, but should be easy to find on hole mount components like jacks and connectors. - Are all components and connectors in good condition? Inspect the card to see if the problem can be detected visually. - In general, some types of errors that are hard to trace might be cured by cleaning the board with an electronic cleaning solvent. Sometimes this can remove conductive debris that shorts out tightly spaced component pins. It might also help to gently scratch the surface between component pins with a scalpel or a similar fine tipped instrument in order to remove debris.
The above list is by no means complete, but it can give an indication on where the problem might be located.
Input or output jacks not working
The Nord Electro is built with high quality components and the circuit boards are well protected in a steel chassis to withstand physical strain. However, input and output jacks are exposed to possible damage, for example when dropping the synth. If a jack is not working, check the EMI-filter for that jack too see that it conducts. Use a multimeter or other appropriate equipment to measure conductance. Measure at the outer ends of the EMI-filter. See the schematic for details on where to find the EMI-filter for each jack. Also check for bad solder joints or cracks in the PCB.
Display shows ’E7’
This error code indicates that there are errors on the software in FLASH. The problem can be cured by updating the software to the latest version. The software is uploaded via MIDI with an update program that can be downloaded at www.clavia.se. Follow the instructions as displayed by the program. In some cases, this might not cure the problem.
Some keys not working or one key trigs several notes
This problem is most likely to occur if circuits U5, U12 and U29 on the main board are faulty. Inspect them visually to see if any of them seem to be in bad condition.
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
RESET 1
ROTORPEDAL
Plottscale:0.665 stående
silent gnd
DSP clk
MIDIIN
silent gnd
silent gnd
MIDIOUT
SUSTAINPEDAL
silent gnd
CONTROLPEDALINPUT
mountingholes 4.8mm plated
CONNECTORPOWER
JTAG con
silent gnd
silent gnd
silent gnd
RESET 0
Connector
Connector
Panel
KeyboardConnector
Keyboard
PCB=2R-J1399-020125
Rev.history: v0.99->v1.00:delete R65Y2 changed to MA505/506
Design regler:-Separat +5V matning från kontakt till AD omv-Separat jord till alla pottar från AD omv
AD Ref 4.504 V
PCB=2R-J1398-020213
Ej fylld lysdiod är grön.
Fylld lysdiod är röd.
Electro 73
Electro Rack
Rev.history:v.0.91->v.0.92:Ld125=green, fixed in assy.dwg.Bot.peelable mask added.v.0.92->v.1.00:2 resistors added (0R) for version handling,R50,51. Old R100 and R101renamed to R48 and R49. LD130,red,added.P2 deleted.
_
nord electro panel board vers 1.00A3
1 1Thursday, February 14, 2002
Title
Size Document Number Rev
Date: Sheet of
S2
S3S2
S3
S0
S0
WD8WD9
WD13
WD11
WD12
WD12
WD15
WD13
WD10
WD10
WD14
WD11
WD14
WD10
WD15
WD15
WD12
WD14
WD14
WD12
S1
WD8
WD8
S1
WD8
WD13
WD11
WD8
WD15
WD13
WD9
WD9
WD11
WD10
WD12
WD13
WD14
WD15
WD11
WD10
WD9
WD9
D12
D10
D8
CS3CS2
A2
D14
D11
A0A1
A0
D13
D11
CS2
D15
A1
D13
D11
D9
D13
D15
D9
D9
D14
D8
D12
D14
D8
D15
CS3
D10
D12
D10
A2
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
LD46LD44
S44
LD10
S27
U4
74HC374 TSSOP
347813141718
111
2569
12151619
D0D1D2D3D4D5D6D7
OCCLK
Q0Q1Q2Q3Q4Q5Q6Q7
LD53
LD30
U10A
74HC32 soic 1
23
C12 0.1u
S31
R2 100
LD120
LD54
U10B
74HC32 soic 4
56
S35
LD121
LD55
C13 0.1u
LD26
U10C
74HC32 soic 9
108
S39
LD122
LD56
S37
S48
R3 100
U10D
74HC32 soic 12
1311
C14 0.1u
R3810k
S43
D4 BAV70
13
2
LD123
LD57
GS7
LD114
D12BAV70
13
2
LD41
LD19
LD58
S3
S47
M4
R4 100
C15 0.1u
S40
LD105
LD5
S4
M6
LD59
S50
R3410k
Q1BCX53
LD87
R261k
S1
R5 100
M8
LD60
P1
CON26pol
123456789
1011121314151617181920212223242526
Q2BCX53
LD69
R251k
C16 0.1u
LD13
S2
U8
74HC374 TSSOP
347813141718
111
2569
12151619
D0D1D2D3D4D5D6D7
OCCLK
Q0Q1Q2Q3Q4Q5Q6Q7
LD68
C1 0.1u
LD32
LD78
LD51
D1 BAV70
13
2
LD67
R51 0R
C17 0.1u
S33
R3910k
S49
R6 100
LD66
LD23
LD8
LD96
GS17
C18 0.1u
LD65
S36
R271k
C19 0.1u
LD29
cwVR1010k Lin panelpot
cwVR810k Lin panelpot
R7 100
LD64
D10 BAV70
13
2
Q3BCX53
C20 0.1u
LD125
cwVR910k Lin panelpot
U9MAX1112 CAP 20SSOP
1234
11
12
13
18
16
15
14
10
9
1719
20
5678
CH0CH1CH2CH3
RefIn
RefOut
Agnd
CS
SStrb
Dout
Dgnd
SHDN
COM
DinSCLK
+5V
CH4CH5CH6CH7
LD63
GS8
LD28
M9
cwVR1110k Lin panelpot
LD62
LD130
R8 100
R4010k
S23
LD77
LD49
S46
S29
LD70
D11 BAV70
13
2
LD76
LD40
LD17
cwVR610k Lin panelpot
S42
R281k
S15
M2
LD75
LD3
S32
D16BAV70
13
2
S38
Q4BCX53
LD80
C7
0.1u
S16
R15
100
LD71
S34
LD81
C6
0.1u
LD47LD45
S13
LD72
LD11
S30
LD82
LD37
S14
U5
74AC138 soic
123
456
1514
12111097
13
ABC
EN1EN2EN3
Y0Y1
Y3Y4Y5Y6Y7
Y2
LD74
R4110k
S26
LD61
LD83
D8 BAV70
13
2
LD73
GS18
S25
S22
LD106
LD84
R291k
R480R
LD25
D5 BAV70
13
2
LD52
Q5BCX53
LD85
LD97
S28
U7
MAX1113CEE 16QSOP
1234
7
8
9
14
12
11
10
6
5
1315
16
CH0CH1CH2CH3
RefIn
RefOut
Agnd
CS
SStrb
Dout
Dgnd
SHDN
COM
DinSCLK
+5V
ab
cd
e
f
LD128LEDdisplay
109854237
1 6
ABCDEFGDP C
AC
A
LD88
LD86
GS11
R46
10k
LD127
LD35
LD20
LD79
S9
LD6
R45
10k
R17
150
LD89
R301k
C5
0.1u
S10
C9
0.1u
Q6BCX53
LD90
R18
150
U1
74HC245 TSSOP
23456789
191
1817161514131211
A1A2A3A4A5A6A7A8
GDIR
B1B2B3B4B5B6B7B8
D2 BAV70
13
2
LD14
cwVR110k Lin panelpot
S21
R19
150
LD91
LD39
LD15
cwVR310k Lin panelpot
cwVR210k Lin panelpot
R20
150LD92
LD1
cwVR410k Lin panelpot
S24
M1
R21
150
LD93
LD22
cwVR510k Lin panelpot
LD43
M3
LD94
LD113
R22
150
R311k
LD9
D15BAV70
13
2
LD36
Q7BCX53
M5
LD112
LD95
R23
150
LD124
M7
LD111
R
S51
U2
74HC374 TSSOP
347813141718
111
2569
12151619
D0D1D2D3D4D5D6D7
OCCLK
Q0Q1Q2Q3Q4Q5Q6Q7
LD27
LD98
LD110
U3 74HC374 TSSOP
347813141718
111
2569
12151619
D0D1D2D3D4D5D6D7
OCCLK
Q0Q1Q2Q3Q4Q5Q6Q7
R1 100
GS12
LD115
LD99
LD109
ab
cd
e
f
LD129LEDdisplay
109854237
1 6
ABCDEFGDP C
AC
A
+C4
10u
C11 0.1u
S20
LD116
LD100
R321k
LD34
LD18
Q8BCX53
R10
100
LD117
LD101
LD108
GS5
LD4
R16
100
R11
100
LD107
LD102
R3510k
C8
0.1u
R12
100
LD103
LD118
LD12
LD31R13
100
LD119
LD104R43 1k
LD50
D14BAV70
13
2
R44 1k
R331k
D7 BAV70
13
2
R14
100
C100.1u
LD24
Q9BCX53
S45
D3 BAV70
13
2
R3610k
LD126
LD42
R49
100k
R9
100
LD21
LD7
U6
74HC245 TSSOP
23456789
191
1817161514131211
A1A2A3A4A5A6A7A8
GDIR
B1B2B3B4B5B6B7B8
+C310u
R47 100
GS6
LD48
LD33
LD16
R24
150
R50 0R
cwVR710k Lin panelpot
S41
D6 BAV70
13
2
D9BAV70
13
2
LD2
R3710k
S19
D13BAV70
13
2
+C2
10u
R4210
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1Printerscale=0.92PCB=2R-J1443-010110
Revision History:Rev.0.x to 1.00: maindevelopement.1.10: Fuseholder modified.