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Disassembling and assembling
SERVO-s Ventilator System
4
General
Disassembling of the SERVO-s is described in this
chapter. If not stated otherwise, the assembling
procedure is the reverse of the described
disassembling procedure.
The illustrations in the SERVO-s Spare Parts List are
very useful as a guide when disassembling and
assembling the SERVO-s.
Preparations
Before disassembling or assembling the SERVO-s:
. Set the On / Off switch on the User Interface to
Off.
. Disconnect the mains power cable
.
. Disconnect the gas supplies (wall and/or
cylinder).
. Make sure that all gas conveying parts are
cleaned according to instructions in the
'
SERVO-s Ventilator System - User's manual'.
After any service intervention in the SERVO-s,
perform a
'
Pre-use check' according to
instructions in the 'SERVO-s Ventilator System -
User's manual1.
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 electronic device.
PC boards must not be inserted or removed while
the mains power or battery power is applied to the
PC boards.
Remove and insert the PC boards very carefully to
avoid damage to the connectors.
Replacing PC boards
The SERVO-s System SW is distributed on different
subsystems, located on the following PC boards:
. PC 1771 Control
. PC 1772 Monitoring
. PC 1784 Expiratory Channel
. PC 1777 Panel
.
When delivered as spare parts, these PC boards are
equipped with a
'
System SW version1 that may differ
from the version on the unit to be repaired.
To keep the 'System SW version' used prior to the
PC board replacement, the applicable 'System SW
version
'
must be available on a PC Card for re-
installation purposes.
For functionality enhancement, the latest released
'
System SW version' is always recommended.
Before installing a new 'System SW version' on a unit,
ensure that the software is fully compatible with all
HW-, SW- and mechanical components in the unit.
If any compatibility conflicts are apparent this will be
noted on the
'
MAQUET Critical Care SW download'
web site.
Assembling guidelines
All parts of the unit assembled with screws and nuts
are tightened with a specified torque. In the User
Interface, some of the screws are also secured with
threadlocking adhesives as noticed during
disassembling.
In order to maintain these specifications over time, it
must be ensured that after any service intervention
removed parts are re-assembled and secured
according to instructions. Make sure to follow the
guidelines stated below.
Tightening torque
. Thread size M3:
0
.
95 ±0.05 Nm
. Thread size M4-M6:
3
.
1 ±0.1 Nm.
Threadlocking adhesives
. Electrolube Bloc
'
Lube BLV15ML® on threads in
contact with PC boards.
. Loctite 243® on all other threads
.
4-2
Service Manual
Revision 01
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