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P T E L T D
ST55 Level 2 Service Manual
Copyright © Siemens Pte Ltd.
Siemens Technical Support Centre
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ICM MP CCQ SLI RHQ
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Internal Use Only
6
Disassembly of ST55
Note:
ESD concept; the internal circuits will be more susceptible to ESD because of the use of exchangeable
housing. The construction of the internal block must be/is designed, in the best possible way, to protect the circuit
against sparks.
Attention: Do not touch the screen of the display module when the upper case is removed! The module is damaged
after finger contact! Use a protection foil during disassembly and do not forget to remove this foil during reassembly.
The keypad must be completely closed to prevent any occurrence of an ESD disruptive discharge.
The SIM contacts may be open, thus reachable for ESD contact discharge. This could lead to damage or destruction of
the IC pins.
It is a requirement for the service personnel to observe ESD protection rules while performing servicing the ST55.
For assembly a torque T5 screw driver adjusted to 7Ncm is required.
Step 1
Remove BATTERY, CARKIT RUBBER and 2 SCREWS
(M1.6*6.5) located on BASE CASE ASSY.
Step 2
Detach the TOP CASE ASSY. by sliding the upper gap
from bottom to both sides.
Step 3
Remove the KEYSET from TOP CASE ASSY.
Step 4
Add a protect membrane on LCD. Remove 2 SCREWS
(M1.6*6.5) on top.
