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Maintenance/Upkeep
18.3
Replacing the Back–Lighting (TP37 only)
Note on TP27
The back–lighting of the TP27 cannot be replaced by the user. Please contact
your Siemens representative if the back–lighting is defective.
Service life
The brightness of the LCD back–lighting decreases during the course of time
for technological reasons. The difference in brightness between a new fluores-
cent tube and an old one is clearly noticeable on the screen. Therefore, replace
both tubes simultaneously if one fails. This saves having to open up the TP a
second time when the second tube fails.
The way to increase the service life of the two fluorescent tubes by blanking
the screen is described in Section 11.2.
Before replacing
The unit must be opened up in order to replace the back–lighting. Observe the
following notes on safety with reagrd to opening the TP:
Warning
!
18-4
Repairs to the TP must be performed by suitably qualified, authorized
technical personnel.
The user may be exposed to exteme risk as a result of unauthorized open-
ing of the TP and inexpert repairs.
The display back–lighting operates at voltages > 1000 V. Ensure that the
TP37 is disconnected from the power supply before the TP is opened.
Crystal liquid may leak from a damaged display.
Do not allow liquid to come incontact with the skin; do not inhale vapors.
If crystal liquid does come into contact with the skin, wash the affected
area skin immediately with alcohol.
Consult a doctor without delay.
Before working on a open unit, observe the ESD guidelines in the
Appendix E of this manual.
TP27, TP37 Equipment Manual
Release 01/00
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