Antenna Troubleshooting - Nokia RM-824 Service Manual

RM-824; RM-825; RM-826
Cellular RF troubleshooting

Antenna troubleshooting

All antennas are glued into the unibody and the radiators are visible only around contact areas. Check the
areas where the C-clips touch the radiator for mechanical damage. If the antenna, LDS radiator of the feed
pad on antenna looks obviously damaged, replace the entire unibody. If replacing the unibody does not
correct the problem, check for further mechanical damage and repair. Any damage to the groundings can
impact antenna performance and should be repaired. The following diagram describes the antenna related
mechanical grounding connections that may need repair.
Figure 13 Antennas
Check all ground connections for mechanical damage. Determine if they can be repaired.
The antennas and IHF speaker are connected to the PWB with C-clips. Inspect the PWB for damage to any of
the antenna and IHF C-clips. If the C-clips are missing or are obviously damaged (i.e. deformed), the clips must
be replaced with new ones.
If corrosion is present on the PWB or the antenna contact areas are corroded, most likely the PWB and/or the
phone need to be replaced. If the antenna contact areas are obstructed or covered, the contact areas should
be cleaned or the entire unibody replaced.
Issue 2 NOKIA INTERNAL USE ONLY Page 4 – 11
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