Leica M500 N Service Manual page 15

Service manual M500 N, M520, M525
Doc Code 10 665 751
Control unit
Blockdiagram
Hand-/Footswitch 1 and 2
5V
J2
CAN-
Bus
CAN-
Bus
J3
P7
Service,
2
Download
J8
Relay
contact
J9
Relay
contact
Powering
Control units before 03/2005 had a power inlet for 230VAC ad the built-in power supply could feed the system with
+24VDC. This was required in stand systems having no own power supply like the MC1.
Since 03/2005 all stand systems have their own power supply. So the power supply was removed from control unit,
now it is supplied via the CAN bus cable with 24VDC.
Processor
An Intel 386EX Processor is used. It is clocked with 20MHz. The memory consists of 256kByte RAM, 256kByte Flash-
EPROM and 4kByte EEPROM. The
A watch-dog is integrated, it observes the running of the main program. Diagnosis LED's might help with trouble
shooting, refer to chapter 4 – fault finding / diagnosis
J5 J6
5V
RS232
DUART
CAN-
CAN-
Controller
Trans.
82527
24V
5V 40MHz
5V
CLK2
Watchdog
Processor
Timer
386EX CPU,
2
PLD Glue Logic,
RS232
Bus Transceivers
J10
LCD - Graphic Controller
Function
keys
software can be updated/downloaded
1-11
RAM
256kByte
Flash-
EPROM
256KByte
Power-off
Timer
EEPROM
4 kByte
+24V
max 230V AC
J11
LCD - Display
240 x 128 Dots
with VF-backlight
through the RS232 service-interface.
LED's.
Description
08/2007 Gahe
"Gold"-
capacitor
Power supply
DC
AC
removed since
03/2005
steuerge.ds4