Damaged Rf Feed Pin Or Ground Pin; Wrong Internal Antenna Is Installed - Nokia RH-57 Series Troubleshooting Manual

2112 (RH-57)
Troubleshooting — Antenna
If no internal antenna is installed, the antenna gain is degraded by more than 25 dB.
• If the internal antenna is missing, install a new one.
• If the radiator looks obviously damaged, replace the internal antenna.

Damaged RF Feed Pin or Ground Pin

RF pin
IHF speaker
pins
Figure 3: Top (left) and bottom (right) views of the 2112 (RH-57) internal antenna
If the RF feed does not touch the PWB, then the antenna gain will degrade by more than
25dB. If the ground pin does not touch the PWB, then the antenna gain may degrade
from 5—10 dB.
Replace the internal antenna if any of the following situations apply:
• Either the RF feed pin or ground pin are broken or bent such that either pin will
not touch the PWB
• The springs for the RF or ground pin appear damaged
• The slot in the radiator has a significantly different shape
• Obvious damage to the radiator (e.g., dents, corrosion)
• The pin is stuck or has excessive friction in the plastic tube/guiding feature
resulting in the spring not working properly
• Either of the IHF speaker pins is damaged or if the IHF speaker is nonfunctioning

Wrong Internal Antenna is Installed

Figure 4: Top views of the 3100 (RH-19) (left) and 2112 (RH-57) (right) antennas
The 2112 and 3100 antennas are similar in appearance. The important visual difference in
the antennas is that the slot pattern is very different. Also, the 2112 antenna is thicker
than the 3100 antenna and also has a spacer on its back side.
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Ground pin
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©2004 Nokia Corporation
Nokia Customer Care
IHF speaker
Ground pin
port
Company Confidential
RF pin
Radiator
Issue 1 07/2004