Antenna Position Into D-Cover; Damaged Rf Feed Pin; Obstructed Rf Feed Pad Or Missing Matching Circuit - Nokia 6255 Description And Troubleshooting

6255/6255i/6256/6256i (RM-19)
Antenna Description and Troubleshooting

Antenna Position into D-cover

The internal antenna and whip are assembled into the D-cover as shown in Figure 5. If
no internal antenna is installed, the antenna gain will be degraded by more than 25 dB.
• If the whip antenna is missing, install one.
• If any part of the whip/stub antenna looks obviously damaged, then replace the
whip/stub antenna.
Note: To take the whip/stub antenna out of the D-cover, slightly twist the antenna to release locking
mechanism and take it out.

Damaged RF Feed Pin

The whip antenna has a spring clip feed contact that must properly touch the PWB. If the
RF feed pin of the whip antenna does not touch the PWB, the antenna gain will degrade
by more than 25 dB.
• If the RF feed pin is broken, or bent such that the pin does not touch the PWB,
replace the whip antenna.
• If the spring for the RF feed pin damaged, replace the whip antenna.

Obstructed RF Feed Pad or Missing Matching Circuit

If any portion of the RF feed or ground pin is obstructed, removed, or covered, the RF pin
will not touch the PWB and the antenna performance will degrade. If the RF feed pin of
the whip antenna does not touch the PWB, the antenna gain will degrade by more than
25 dB.
Page 6
Whip antenna
Figure 5: D-cover assembly
Figure 6: Spring clip feed contact on the whip antenna
©2005 Nokia Corporation
Nokia Customer Care
Company Confidential Issue 2 05/2005