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RM-839; RM-840; RM-841
Cellular RF troubleshooting
Where can you find the PWB design version for different BOMs
Figure 19 The version of the PWB layout
Antenna
Antenna overview
The device has two internal antennas:
• The main antenna which is integrated to the bottom of the phone
• Bluetooth antenna which is integrated to the top of the phone
The main antenna covers GSM and WCDMA bands. Connection from the phone PWB to the antenna pattern is
implemented by C-Clips.
The main antenna consists of a PIFA antenna and a parasitic part in the bottom of the phone. The main
antenna consists of an antenna carrier, which is called Cellular Antenna Module and assembles in the D-cover.
Main antenna functionality
The main antenna consists of a PIFA antenna and a parasitic part which cover all the frequency ranges. The
radiator contains three pads, one is the parasitic grounding, the middle one is the antenna feed, and the
other one is the PIFA grounding pad which connects in series with an inductor. All the pads are connected
by the C-Clips on the PWB.
Antenna troubleshooting
Cellular antenna
Check that the GND and feed pads take proper contact to the C-Clips on the main PWB. Also check visually that
all the matching components are soldered properly. In case of damage, the damage component needs to be
replaced.
If the low band or WCDMA band1 is not working properly, it may indicate the antenna crack in the corner.
Cracks in the antenna can be checked by the multi-meter. In this case, the antenna module must be replaced.
Issue 1
NOKIA INTERNAL USE ONLY
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