Clavia Nord Lead 3, Service Manual

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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).