Nokia 3105 Servicehandbuch
RH-48
Troubleshooting — Antenna
CCS Technical Documentation
Page 8
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
Grounding of RUIM Card Flap
Figure 9: Conductive sticker grounding RUIM card flap to RF shield
The RUIM card flap needs to be grounded to the RF shield with a conductive sticker. The
shape and location of the conductive sticker is shown in the figure above. If the conduc-
tive sticker is missing or ripped, it needs to be replaced.
shape and location of the conductive sticker is shown in the figure above. If the conduc-
tive sticker is missing or ripped, it needs to be replaced.
If the sticker is damaged or missing, then the radiated sensitivity could be reduced
by 4-8dB.
by 4-8dB.
RF Connector Failure
The RF connector could fail by not connecting the RF input to the RF output of the RF
connector. If this happens, then the antenna gain will degrade by about 25dB. This can
be checked by testing for DC conductivity between the RF input and RF output of the RF
connector. Note the DC conductivity test must be done without any cable attached to
the RF connector. Since the RF connector is also a switch, the RF output will be discon-
nected from the RF input when a cable is inserted into the RF connector. When a cable is
inserted, the RF input is connected to the RF connector. The location is shown in
Figure 6.
connector. If this happens, then the antenna gain will degrade by about 25dB. This can
be checked by testing for DC conductivity between the RF input and RF output of the RF
connector. Note the DC conductivity test must be done without any cable attached to
the RF connector. Since the RF connector is also a switch, the RF output will be discon-
nected from the RF input when a cable is inserted into the RF connector. When a cable is
inserted, the RF input is connected to the RF connector. The location is shown in
Figure 6.
RF input — connector to duplexor
RF output — connects to antenna pad through vias
RF connector — connects to coaxial cable
If the RF input is not connected properly to the RF output, the RF connector must be
replaced.
replaced.