Siemens Servo Screen 390 User manual

ServoScreen390
Service Manual
E382E394E061010202

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General
The documentation for the Servo Screen 390
consists of:
• Operating Manual
• Service Manual
• Spare Parts List
The Operating Manual is an indispensable
complement to the Service Manual for proper
servicing.
As the Servo Screen 390 is a part of the Servo
Ventilator system, there are also other
documents that can be useful when servicing
the Servo Screen 390:
• Servo Ventilator 300/300A
– Operating Manual
– Service Manual
– Circuit Diagram
– Reference Manual, Computer Interface
• Servo Ventilator 900C/E
– Operating Manual
– Service Manual
– Circuit Diagram
– Reference Manual, SCM 990
Text inside a box is used to highlight
important information.
In addition to the Important information given
here and in the related documents (e. g. in the
Operating Manual), always pay attention to
applicable local and national regulations.
Responsibility for the safe functioning of the
equipment reverts to the owner or user in all
cases in which service or repair has been done
by a non-professional or by persons who are
not employed by or authorized by Siemens,
and when the equipment is used for other than
its intended purpose.
There are two different versions of the Servo
Screen 390:
• Serial No. 10000 or lower – Equipped with
Computer board PC 1662 and a software
memory card of PC Card™-type.
• Serial No. 10001 or higher – Equipped with
Computer board PC 1835 and a software
memory card of CompactFlash™-type.
All information in this Service Manual is valid
for both versions unless stated otherwise.
Hazard notices
Make sure that all cables are disconnected
from the connection ports when disassembling
or assembling the Servo Screen 390.
Service
When working with ESD sensitive compo-
nents, always use a grounded wrist band and
grounded work surface. Adequate service tools
must also be used.
Worn-out batteries must be returned
to the place of purchase or to a place
where they can be safely disposed
of. Batteries must not be disposed
of with ordinary waste. All other
parts shall be discarded according to
hospital rules and in an environ-
mentally safe way.
Functional check
After any service intervention in the Servo
Screen 390, perform a Functional check
according to the instructions in the Operating
Manual.
To responsible service personnel
The contents of this document are not binding.
If any significant difference is found between
the product and this document, please contact
Siemens for further information.
We reserve the right to modify products
without amending this document or advising
the user.
Only personnel authorized by Siemens shall be
permitted to service or repair the Servo Screen
390. Only Siemens-Elema genuine spare parts
must be used. PC boards (spare parts) must
always be kept in a package for sensitive
electronic devices. Siemens will not otherwise
assume responsibility for the materials used,
the work performed, or any possible
consequences of same.
Important
Pb
Important

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Contents
1. Introduction....................................................................... 5
2. Description of functions................................................... 11
3. Disassembly and assembly.............................................. 17
4. Service procedures ........................................................... 25
5. Troubleshooting ................................................................ 37
6. Index .................................................................................. 41
7.Diagrams............................................................................ 45
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4
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Contents

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Notes
Notes

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1.Introduction
1
1. Introduction
General .................................................... 6
Hardware overview ................................. 7
Main sections ..................................... 8
Display section ................................... 8
Computer section............................... 9
Firmware/softwareoverview................... 9
Firmware ............................................ 9
Software............................................. 9

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1.Introduction
General
Servo Screen 390 is a computer unit that
reads information from a ventilator, makes
calculations, and presents the information to
the operator in a clear, logically organized
manner.
The primary purpose of Servo Screen 390 is
to provide a central location for the display of
all parameter information from the ventilator.
It provides information on system and
patient conditions, logically assembled in a
way that presumes presentations including
curves.
Servo Screen 390 does not control the
ventilator or any other medical equipment.
Servo Screen 390 is compatible with the
following ventilator systems:
• Servo Ventilator 300/300A
• Servo Ventilator 900C/E systems that use
Servo Computer Module 990 (SCM 990)
More information about the compatible
ventilators can be found in the chapter
“Technical specifications” in the Operating
Manual.
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1.Introduction
1
Hardware overview
Servo Screen 390 unit is a small, compact,
ergonomically-designed computer unit. It is
manufactured from materials suitable for
use in a clinical environment and is designed
specifically for integration with existing
ventilator equipment.
The primary features of the Servo Screen
390 are:
• Anelectro-luminescent,mono-chromatic
screen (1) which provides displays that are
clearly visible within the bedside working
area.
• A power on/off switch (2).
• A single operator control including a pulse
generator in the form of an easy-to-use
knob (3), which can be only turned or
pressed.
• A removable software memory card under
the protective cover (4) for easy software
updates. More information about software
upgrading can be found in the chapter 4,
“Service procedures”.
• Connection ports as follows:
– KBDport(5) forconnection of a keyboard.
For service use only.
– PRINTER port (6) for connection of a
printer.
– COM port (7) for serial communication
with other equipment. For future appli-
cations. Dependent on the software
version.
– VENT port (8) for serial communication
with the ventilator.
– CRT port (9) for connection of an external
monitor.
– PWR port (10) for connection to a power
source.
More information about the connection ports
can be found in the chapter 7, “Diagrams”.
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Main sections
Servo Screen 390 can be separated into two
main sections:
• Display section (1)
• Computer section (2)
The support arm (3) is always used to mount
the Servo Screen 390 on a ventilator cart or
wall rail.
Display section
The anti-reflex coated front panel filter (4)
protects the display (5) and makes it easy to
keep the display clean.
To reduce EMC radiation to the environ-
ment, a cover plate (6) is mounted at the
rear of the display.
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1.Introduction
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Computer section
The two PC boards mounted in the computer
section are:
• Computer board (7), containing micro-
processor, SS390-BIOS, internal memory
and an interface for the software memory
card. All connection ports except thepower
port are mounted on the computer board.
There are two different versions of the
Computer board (7), PC1662 and PC1835.
• Adapter board PC 1663 (8), containing
voltage distribution and display interface.
A fan (9) inside the computer unit provides
forced air cooling for the PC boards. The fan
has a rubber suspension to reduce noise.
Firmware/software overview
Firmware
The SS390-BIOS on the computer board
initializes the system and starts the
applicationsoftware.
The SS390-BIOS can be upgraded if
required.
Software
The operating system and the Servo Screen
application software is supplied on a remov-
able software memory card. The user
interface provided by this software is
described in the Operating Manual.
The software memory card is very easy to
replace in case of future software upgrades.
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1.Introduction
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Notes
1.Introduction
1

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2. Description of functions
2.Description of functions
General .................................................... 12
Power supply........................................... 12
With Servo Ventilator 300/300A ......... 12
With Servo Ventilator 900C/E ............. 12
Adapter board.......................................... 13
General............................................... 13
Voltage distribution............................. 13
Signaladaption ................................... 13
Brightness control .............................. 13
Fan control.......................................... 13
Board identity ..................................... 13
Internal power cable ........................... 13
ON/OFF switch .................................. 14
Display connection cable .................... 14
Fan ..................................................... 14
Computer board ...................................... 14
General............................................... 14
Software memory card....................... 15
Battery................................................ 15
Pulse generator .................................. 16
Connection ports ................................ 16
Display..................................................... 16

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2. Description of functions
2
General
The text in this chapter refers to the block
diagram in chapter 7, “Diagrams” (on the
inside of the back cover).
Power supply
With Servo Ventilator 300/300A
The power supply is connected to the power
inlet port PWR (P21) on Servo Screen 390.
The internal power cable connects the
power inlet port to the ADAPTER BOARD at P18.
The PWR port is described in chapter
7, “Diagrams”.
Power to the Servo Screen 390 is supplied
from the Servo Ventilator 300/300A auxiliary
equipment output N78.
Connector N78 is described (output signals
and limitations) in the Servo Ventilator 300/
300A – Service Manual.
With Servo Ventilator 900C/E
The power supply is connected to the power
inlet port PWR (P21) on Servo Screen 390.
The internal power cable connects the
power inlet port to the ADAPTER BOARD at P18.
The PWR port is described in chapter
7, “Diagrams”.
Power to the Servo Screen 390 is supplied
from an AC Power Adapter 124 when used
with a Servo Ventilator 900C/E.
Technical specifications for the AC Power
Adapter 124:
Mains power supply ...........100 – 240 V
Mains frequency.................50 – 60 Hz
ON/OFF-indication ..............Green LED indi-
cates power on
Output voltage range..........24 V DC ±10%
Output power.....................max. 50 W
Earth leakage current,
normalcondition
(IEC 601-1-1) .......................30A
Fuse (internal).....................2.4 A slow

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2. Description of functions
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Adapter board
General
The functional blocks on the ADAPTER BOARD
PC 1663 are:
•V
OLTAGE DISTRIBUTION
•SIGNAL ADAPTION
•BRIGHTNESS CONTROL
•FAN CONTROL
•BOARD IDENTITY
Further functional blocks connected to the
ADAPTER BOARD are:
•I
NTERNAL POWER CABLE
•ON/OFF SWITCH
•DISPLAY CONNECTION CABLES
•FAN
The ADAPTER BOARD is connected directly to
the COMPUTER BOARD via N5.
Voltage distribution
The inlet power is fused at F1 (3.15 A fast).
Replacing the fuse is described in chapter 4,
“Service procedures”.
The different voltage levels used in the
Servo Screen 390 are regulated by and
distributed from this block.
The distributed voltage levels are:
1. +12 V (±5%), max. 2.6 A. An overvoltage
protection cuts the voltage distribution at
typ. 14.6 V.
2. +5 V (±3%), max. 3.0 A. An overvoltage
protection cuts the voltage distribution at
typ. 6.2 V.
Signal adaption
The control signals from the COMPUTER BOARD
PC 1662/PC 1835 to the display are adapted
in this block and furthered to the main block
DISPLAY via P20.
Brightness control
The brightness in the displaycanbeselected
using the SYSTEM MENU in the application
software. The selected brightness is then
controlled via this block and furthered to the
main block DISPLAY via P19.
When exchanging PC 1663, a setting of the
brightness level may be required, refer to
chapter "3. Disassembly and assembly",
section "Assembling the computer section".
Fan control
An NTC-resistor on PC 1663 senses the air
temperature inside the Servo Screen 390.
Ifthe airtemperature inside the unit exceeds
approx.53°C (127°F),thefan is switched on.
When the temperature drops below approx.
45°C (113°F), the fan is switched off.
Board identity
PC 1663 is equipped with a BOARD IDENTITY
function that makes it possible for the
COMPUTER BOARD PC 1662/PC 1835 to
recognize the PC 1663 version. This function
is intended for possible future versions, e.g.
new types of displays.
Internal power cable
The internal power cable connects the
PC 1663 (P18) with the power inlet port
PWR (P21).

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2. Description of functions
2
Computer board
General
There are two different versions of the
COMPUTER BOARD:
• 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 SerialNo. 10001 or higher.
SoftwarememorycardofCompactFlash™-
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 COMPUTER BOARD
PC 1662/PC 1835 are:
•M
ICROPROCESSOR
– 80486SX, 25 MHz on PC 1662
– Pentium, 166 MHz on PC 1835.
• VGA CONTROLLER
•BUS INTERFACE including:
– Diskette drive interface (not used)
– Hard disk interface (for test purposes
only)
– Two serial ports
– One parallel port
– Keyboard controller
•P
ULSE GENERATOR INTERFACE
•VOLTAGE & FUNCTION MONITORING
•INTERNAL MEMORY. 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 MEMORY
ON/OFF switch
The ON/OFF SWITCH 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 DISPLAY CONNECTION CABLES connect
the ADAPTER BOARD to the DISPLAY.
One flat cable connects SIGNAL ADAPTION
signals from P20 on PC 1662/PC 1835 to
display connector J1.
One cable connects BRIGHTNESS CONTROL
signals from P19 on PC 1662/PC 1835 to
display connectors J2 and J3.
Fan
The Servo Screen 390 is equipped with a
FAN. The fan is controlled by the block FAN
CONTROL.
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.

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2. Description of functions
2
• SRAM (only on PC 1662). This battery
backed up memory contains software
settings (e.g. battery replacement date),
TRENDS and the EVENT LIST.
Note – On PC 1835, TRENDS and EVENT LIST
are stored on the CompactFlash™ card
and thusnotdependentonthebattery.
•S
OFTWARE MEMORY CARD INTERFACE
• SS390-BIOS. Contains low-level software
(BIOS, drivers, start-up screen including
software loading messages and initial
program load of the application software).
There are two different versions of the
SS390-BIOS:
– SS390-PROM mounted on PC 1662.
This PROM is mounted on a PROM
socket and can be upgraded (replaced) if
required.
– SS390-FLASH mounted on PC 1835.
This FLASH memory can be upgraded
(new software downloaded) if required.
Referto chapter 4, “Service procedures” for
furher information regarding upgrades.
The computer is equipped with procedures
for self-testing and the self-test result can be
displayed in the SERVICE MENU. See chapter
4, “Service procedures”.
Further functional blocks connected to the
COMPUTER BOARD are:
•S
OFTWARE MEMORY CARD
•BATTERY
•PULSE GENERATOR
•CONNECTION PORTS
The COMPUTER BOARD is connected directly to
the ADAPTER BOARD via P5.
Software memory card
The SOFTWARE MEMORY CARD contains the
operating system and the Servo Screen 390
application software. Loading of the soft-
ware into the INTERNAL MEMORY is initialized
by the SS390-BIOS during start-up.
There are two different versions of the
SOFTWARE MEMORY CARD:
• PC Card™ used on PC 1662.
• CompactFlash™-card used on PC 1835.
Note – As patient related TRENDS and unit
related EVENT LIST are stored on the
CompactFlash-card, it is notrecommended
to move a CompactFlash-cardbetween
different units.
The software on the memory card is
specifically designed for Servo Screen 390,
and cannot be used on a standard PC.
The software memory card is easy to
replace in case of future software upgrades.
See chapter 4, “Service procedures”.
Battery
The lithium BATTERY (3.6 V) is used to back up
the computer setup stored in the CMOS-
RAM and, for PC 1662, also to back up the
SRAM. If the battery is disconnected,
factory default settings will be used next
time the Servo Screen 390 is started.
The battery must be replaced every three
years. The message ”Replace Servo Screen
390 battery” in the message window
indicates when the battery should be
replaced. A new three-year period will start
when the battery replacement has been
confirmed with the BATTERY CHANGE icon in
the SERVICE MENU.
Replacing the battery and Battery change
confirmation is described in chapter
4, “Service procedures”.

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2
2. Description of functions
Display
A monochrome electro-illuminating DISPLAY is
used in this version of Servo Screen 390.
Display connection cables connect the
display to the block SIGNAL ADAPTION via
connector J1 and to the block BRIGHTNESS
CONTROL via connectors J2 and J3.
The unit is prepared for possible future
versions with other display types.
Pulse generator
The PULSE GENERATOR with its CONTROL KNOB
(physically mounted as a part of the display
section) is the only necessary device
available to a clinical user for operating the
application software. The pulse generator
itself does not include any functions other
than interaction with the software.
Connection ports
All CONNECTION PORTS except the power port
are mounted on the COMPUTER BOARD. More
information about the connection ports can
be found in chapter 7, “Diagrams”.

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3. Disassembly and assembly
3
Disassembly and assembly
General .................................................... 18
Handling PC boards ................................. 18
Separating the display section
from the computer section...................... 19
Assembling the display section
with the computer section....................... 19
Disassembling the display section........... 20
Pulse generator .................................. 20
Display................................................ 20
Front panel filter ................................. 21
Assembling the display section ............... 21
Disassembling the computer section ...... 22
Computer board PC 1662/PC 1835
and Adapter board PC 1663................ 22
Fan ..................................................... 23
Assembling the computer section........... 23

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3. Disassembly and assembly
3
General
This chapter describes disassembly and
assembly of some of the main parts of the
Servo Screen 390. The drawings in the
Spare parts list are also very useful as a
guide when disassembling and assembling
the Servo Screen 390.
Before disassembling or assembling the
Servo Screen 390, make sure that all
connection cables are disconnected from
the connection ports of Servo Screen
390.
After any service intervention in the
Servo Screen 390, perform a Functional
check according to instructions in the
Operatingmanual.
Handling PC boards
The PC boards contain components that are
highly sensitive to static electricity.
Those who come into contact with circuit
boards containing sensitive components
must take certain precautions to avoid
damaging the components (ESD protection).
When working with ESD sensitive
components, always use a grounded wrist
band and grounded work surface. Adequate
service tools must also be used.
PC boards (spare parts) must always be kept
in protective packaging for sensitive
electronicdevices.
PC boards must not be
inserted or removed while
power is applied to the PC
boards.
Remove and insert the
PC boards very
carefully to avoid
damage to the
connectors.

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3. Disassembly and assembly
3
Separatingthedisplay section
from the computer section
• Remove the six screws (1).
• Carefully separate the display section (2)
from the computer section (3) as much as
is needed to make the pulse generator
connector N12 on PC 1662 and connectors
N1, N2 and N3 at the rear of the display
accessible.
• Disconnect the connectors mentioned
above.
• The display section is now separated from
the computer section.
Assembling the display sec-
tion with the computer section
The procedure for assembling the display
section with the computer section is the
reverse of the separation procedure
described above.
Make sure that the rubber sealing strips are
mounted on the display section to obtain a
good seal between the sections.
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3. Disassembly and assembly
3
Disassembling the display
section
Pulse generator
• Separate the display section from the
computer section as previously described.
• Pull off the control knob (1) from the pulse
generator shaft.
• Remove the nut (2) and the washer (3) and
lift off the pulse generator (4).
Display
• Separate the display section from the
computer section as previously described.
• Remove the four nuts (1) and the eight
washers (2 and 3).
• Lift off the complete display (4).
• Note the four spacers (5). Make sure that
they are mounted when assembling the
display.
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