User Guide

Nokia Customer Care Antenna Description and Troubleshooting

6255/6255i/6256/6256i (RM-19)

Figure 7: PWB layout of the RF feed pad and the matching circuit

The matching circuit is right next to the RF feed pad. The matching circuit consists of a

shunt inductor of 27nH, a series cap of 1.2pF, and a series inductor of 5.6nH. If the

matching circuit is not installed properly or any of the components are missing, the

extended antenna gain will be degraded by about 25dB and the retracted antenna gain

will degrade by about 15dB.

• If corrosion is present or the pad is missing, replace the PWB and the mobile

terminal.

• If either pad is obstructed or covered, clear and/or clean the pad.

Broken or Missing Bottom Antenna Clip or Matching Circuit

If the bottom antenna clip does not contact the whip stopper when the whip is fully

retracted, the internal antenna gain will degrade by about 4-5dB at Cell band and

3-10dB at PCS band when the whip is retracted.

The bottom matching circuit is right next to the bottom antenna clip and consists of a

series cap of 3.3pF and series inductor of 1.5nH. If the bottom matching circuit is not

installed properly or any of the two components are missing, then the retracted antenna

gain will degrade by about 15dB.

Matching circuit

RF feed pad