UM353-1B Maintenance
April 2012
10-3
Ethernet Connector
MultiMedia Card Socket
Display Assembly with
Operator Faceplate
Communications
Port on Underside
Display Assembly Cable
* = Case Assembly
RJ-45 Ethernet Connector*
O-Ring, Display
Assembly
Warning Label
Flip-Down Door with Loop ID Card
MPU Controller Board
Voltage Input, Approvals, and
Warning Label*
Nameplate*
Warning and I/O
Capacity Label*
Case with Flange*
Connector Socket
Assembly*
Ground Screw*
Connector Cover*
Removable
Portions of
Connectors*
I/O Expander
Board
Mounting Clip,
Top and Bottom*
MG00500a
Figure 10-1 Siemens 353 Exploded View, Design Level B
10.2.4 Circuit Board Handling
ELECTROSTATIC DISCHARGE, ALL ELECTRONIC ASSEMBLIES
Semiconductor devices must be protected from electrostatic discharge. A properly grounded conductive wrist strap
must be worn whenever a circuit board assembly is handled or touched. A service kit with a wrist strap and static
dissipative work mat is available from mail order and local electronic supply companies.
LITHIUM BATTERY PRECAUTIONS
Each MPU Controller board has a lithium battery that is not field replaceable. Note the following when handling or
disposing of either board.
• Properly dispose of an un-repairable circuit board with a lithium battery
• Do not burn the battery
• Do not place the circuit board on a metal surface or otherwise short circuit battery terminals
• Do not attempt to charge the battery
• If electrolyte is exposed, wear safety glasses and rubber gloves when handling the battery
• For details contact the battery manufacturer
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