Siemens 4010 Wartungshandbuch PDF herunterladen (Seite 32)

Information and Communication Products

Confidential 32 ICM D CC ST

J. Junggebauer

Version 2.1 05/01

6.8.7 Mobile unit faulty due to humidity

Note: Due to some measures in order to reduce humidity damages (coating on the

board (keypad side), keypad optimised...) the scrap criteria for humidity damages

changes.

- Boards with oxidation on the keypad side do not have to be scrapped any more

because a coating on the board prevents that humidity gets to the other layer.

- Boards with humidity damages on the component side still have to be scrapped.

Look at all electronic components on the back side. Do not open the RF-Part.

Remaining flux on the component side could look similar to a humidity damage (white

deposits) but it will disappear when heating it up with a hot air blower.

Recommendation:

When you are not sure whether deposit is humidity or flux, heat the area concerned

with a hot air blower and scrap the unit only when deposit doesn’t disappear.

No scrap

Flux

No scrap

Flux

Humidity

--> scrap

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Siemens 4010 Wartungshandbuch Seite 32