Siemens Servo Screen 390 Service Manual page 14

2. Description of functions
ON/OFF switch
The O /O S
N FF WITCH
to the Servo Screen 390 on or off. This is the
only device for turning the unit on or off. No
other action is needed, e. g. when shutting
down the Servo Screen 390.
Display connection cables
2
The two D C
ISPLAY
the A B
DAPTER OARD
One flat cable connects S
signals from P20 on PC 1662/PC 1835 to
display connector J1.
One cable connects B
signals from P19 on PC 1662/PC 1835 to
display connectors J2 and J3.
Fan
The Servo Screen 390 is equipped with a
F . The fan is controlled by the block F
AN
C .
ONTROL
The purpose of this fan is to provide forced
air cooling inside the unit. The air stream
enters through the ventilation holes in the
lower part of the unit and exits through the
ventilation holes in the upper part of the unit.
14
turns the power supply
C connect
ONNECTION ABLES
to the D .
ISPLAY
A
IGNAL DAPTION
C
RIGHTNESS ONTROL
Computer board
General
There are two different versions of the
C B
OMPUTER
• PC 1662. Factory mounted on Servo
Screen 390 with Serial No. 10000 or lower.
Software memory card of PC Card™-type
is used.
• PC 1835. Factory mounted on Servo
Screen 390 with Serial No. 10001 or higher.
Software memory card of CompactFlash™-
type is used.
The two PC boards are interchangable. Refer
to further information in the Spare Parts List
when replacing a PC 1662 with a PC 1835.
The functional blocks on the C
PC 1662/PC 1835 are:
• M
ICROPROCESSOR
– 80486SX, 25 MHz on PC 1662
AN
– Pentium, 166 MHz on PC 1835.
• VGA C
ONTROLLER
• B I
US NTERFACE
– Diskette drive interface (not used)
– Hard disk interface (for test purposes
only)
– Two serial ports
– One parallel port
– Keyboard controller
• P G
ULSE ENERATOR
• V & F
OLTAGE
• I M
NTERNAL
memory is optimized for the software
version. The internal memory is mounted
on a standard socket and can be replaced
if required by future software upgrades.
• V M
IDEO EMORY
Siemens-Elema AB
Servo Screen 390
:
OARD
OMPUTER
including:
I
NTERFACE
M
UNCTION ONITORING
. The size of the internal
EMORY
E382 E394E 061 01 02 02
B
OARD