Siemens Servo i, Service Manual, Page: 18 / 70

Siemens-Elema AB
Description of functions Servo …
E382 E407E 061 01 01 02
3 - 2
3
About this chapter
This text refers to the Functional Main Blocks diagram
in chapter ”Diagrams”. Text written in S
MALL
C
APS
refers to block names in the Main Blocks diagram.
Memory types used in the Servo …
There are four different types of memories used in
the Servo
… :
• Flash memory. For software storage. Can be
upgraded / updated via Option card or S/W version
update card. Present on PC 1771, PC 1772,
PC 1777 and PC 1784.
• RAM. For temporary storage of software and data.
Present on PC 1772 and PC 1777.
• Non-volatile memory. RAM with battery back-up.
For settings, trends and logs. Present on PC 1771
and PC 1772.
• EEPROM. For PC board information, configuration,
calibration data, etc. Present on almost all PC boards
and in the O
2
cell.
User Interface
Functional Main Blocks diagram marking: “
U
”
User Interface controls
Setting of different parameter input values is made
with the help of the following different interface
devices:
• Main Rotary Dial (rotary encoder with switch).
• Direct Access Control, 4 each (rotary encoders).
• Membrane buttons. Integrated parts of the Touch
screen assembly.
• Touch screen.
PC 1777 Panel
Some features included on PC 1777 P
ANEL
are:
• SIMM (Single In-line Memory Module) mounted on
its connector P77. Memory type: SDRAM
• PC C
ARD
S
LOT
intended for connection/insert of a PC
Card. PC Cards are used to:
– Download software into the different flash
memories situated on PC-boards marked m P and
into the EEPROM on PC 1770 M
AIN
B
ACK
-
PLANE
.
– Transfer patient and system data for further
transfer to a computer.
– Service purpose.
• Microprocessor on this board includes control of the
functions of the U
SER
I
NTERFACE
.
• ID-PROM: The ID information can be read by the
Servo … System.
• On/Off switch: Switch to Power up or Power down
the Servo … System. Refer to section ”Power supply”.
• Connection for PC (P86): Ethernet port intended for
test and service purpose. Connected via a service
cable. For future options.
• Microphone used to monitor of sounds from the
Loudspeaker.
Loudspeaker
For generation of sound, e.g. alarm. Connected to
P72 on PC 1777 P
ANEL
.
The loudspeaker generates different tones with
overtones, at different sound volume. The
loudspeaker is continuously supervised by the
microphone on PC 1777 P
ANEL
.
Backlight Inverter
PC board with driving stage for backlight (lamps)
mounted behind the TFT Display. The supply voltage
delivered by the Backlight Inverter is 660 V.
The Backlight Inverter is connected to P73 on
PC 1777 P
ANEL
.
Front panel screen
The front panel screen comprises:
• Touch screen assembly
• TFT Display
• Backlight.
The Touch screen implies the touch function of the
front panel screen and is interactive with information
displayed on the TFT Display. The front panel frame
with the touch screen, membrane buttons and DIM
sensor forms the Touch screen assembly and must
be handled as one complete part. The DIM sensor
measures the ambient light and the screen brightness
is automatically adjusted.
The TFT Display is a Thin Film Transistor Screen for
color display of picture- and alphanumeric data.
The Backlight consists of two fluorescent tubes
(lamps) mounted behind the TFT Screen. They are
driven from the B
ACKLIGHT
I
NVERTER
. Estimated lifetime
(with acceptable brightness level) for the lamps is
30.000 hours.