Siemens S75 - Main Keypad Illumination Problems

Release 1.0
Technical Documentation
10/2005
TD_Repair_L2.5L_S75_R1.0.pdf Page 15 of 15
12 Main keypad illumination Problems
Fault Symptoms
Customer: GRT:
Main keypad illumination does not work Current measured failed
Led’s Problems
Watch for oxidation and
damaged pads of the
LED’s
caused by customer
SCRAP - has to be send
separately to WSC
not
oka
y
okay
Check the status of the
battery connector
visuall
y
Use the diode test
function of a multimete
r
to check the status of
the diode. The typical
voltage drop on the
diode is 1.7 V when
testing the diode
function with the
multimeter.
Exchange
keypad LED’s
Continue with
higher repair level
okay
not
oka
y
not
oka
y
- check for twisted or
bent contacts
- check for dry joints
Back to customer
without repair
LED WHITE TOP
Use soldering iron to remove defective component. Avoid excessive heat! Watch surrounding
components! Resolder new component afterwards.
Attention: Remove Metal Dome Sheet before!!!
E-commerce order number: L36840-L2099-D670
E-commerce order name: LED WHITE TOP
Soldering temperature: ~ 360°C TIP Temp.
IRIS Diagnose Code: 36000 Keys/Illumination
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