Siemens Servo Screen 390, Руководство по обслуживанию, Страница: 14 / 49

Servo Screen 390
14 E382 E394E 061 01 02 02
Siemens-Elema AB
2. Description of functions
2
Computer board
General
There are two different versions of the
C
OMPUTER
B
OARD
:
• 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
OMPUTER
B
OARD
PC 1662/PC 1835 are:
• M
ICROPROCESSOR
– 80486SX, 25 MHz on PC 1662
– Pentium, 166 MHz on PC 1835.
• VGA C
ONTROLLER
• B
US
I
NTERFACE
including:
– Diskette drive interface (not used)
– Hard disk interface (for test purposes
only)
– Two serial ports
– One parallel port
– Keyboard controller
• P
ULSE
G
ENERATOR
I
NTERFACE
• V
OLTAGE
& F
UNCTION
M
ONITORING
• I
NTERNAL
M
EMORY
. The size of the internal
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
IDEO
M
EMORY
ON/OFF switch
The O
N
/O
FF
S
WITCH
turns the power supply
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
The two D
ISPLAY
C
ONNECTION
C
ABLES
connect
the A
DAPTER
B
OARD
to the D
ISPLAY
.
One flat cable connects S
IGNAL
A
DAPTION
signals from P20 on PC 1662/PC 1835 to
display connector J1.
One cable connects B
RIGHTNESS
C
ONTROL
signals from P19 on PC 1662/PC 1835 to
display connectors J2 and J3.
Fan
The Servo Screen 390 is equipped with a
F
AN
. 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.