Clavia Nord C1, Service Manual

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Clavia DMI Service manual Nord C1 Combo Organ rev. 1.0 Page 7
Hardware
Hardware structure
The hardware structure consists of:
One power supply unit, one main board and one panel board.
Power supply
The Nord C1 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 schematic for the power supply. There are also three voltages
supplied from the main board.
U12
(23340)
supplies the Host and DSP´s with +1.8V,
U14
(21540)
supplies the audio D/A with +5V and U37
(25820)
wich supplies the high level
output with +30V. The Power supply is connected to the main board with a 10 pole
connector
P2 (
22480).
Main Board
The main board is equipped with two DSP´s U8-U9
(23280) ,
which is controlled by a host
processor U7
(23180)
with one DRAM circuits U4
(23170)
(1M*16 bits).
Boot code for the host processor is stored in the BootPROM U32
(23892)
(512k*8 bits).
OS is stored in a FLASH memory U33
(23420)
(512k*8 bits).
Various other information, e.g. user settings is stored in an EEPROM U17
(24147)
Audio D/A conversion is performed by U21
(23430)
.
A/D conversion of the control pedal takes place on the panel board U23
(23370)
.
All output jacks are filtered from radio signals with an EMI-filter
(23110)
(component designator prefix F). External connectors are one 26 pole connector for the
panel board
P5
(22520)
,
a 10 pole connector for the power supply unit P6
(22480)
,
a 10 pole straight connector P8
(25551)
for the 11 pin Leslie connector and four keyboard
connectors P1-P4
(22670)
.
Panel Board
On the panel board you will find all control functions of the Nord C1. This panel also
holds the LED
(3x20780)
,
t
he panel board is connected to the main board with a 26 pole
connector P1
(22520).