Nokia 6255 Service Manual 08rm19ant
Nokia Customer Care
6255/6255i/6256/6256i (RM-19)
Mobile Terminal
Antenna Description and
Troubleshooting
Issue 2 05/2005 Company Confidential ©2005 Nokia Corporation
6255/6255i/6256/6256i (RM-19)
Antenna Description and Troubleshooting Nokia Customer Care
Contents Page
Introduction ..................................................................................................................................................... 3
Whip Antenna ..............................................................................................................................................3
Failures and Corrective Measures.............................................................................................................. 5
Damaged Whips ........................................................................................................................................ 5
Antenna Position into D-cover ............................................................................................................. 6
Damaged RF Feed Pin.............................................................................................................................. 6
Obstructed RF Feed Pad or Missing Matching Circuit ................................................................... 6
Broken or Missing Bottom Antenna Clip or Matching Circuit..................................................... 7
Obstructed Whip Stopper....................................................................................................................... 8
GPS Antenna .............................................................................................................................................. 9
Bluetooth Antenna................................................................................................................................ 10
Page 2 ©2005 Nokia Corporation Company Confidential Issue 2 05/2005
6255/6255i/6256/6256i (RM-19)
Nokia Customer Care Antenna Description and Troubleshooting
Introduction
This troubleshooting guide addresses potential failures that affect antenna performance
of the 6255/6255i/6256/6256i, and discusses methods for correction of these failures.
Whip Antenna
Check the following minimum visual quality standards of the whip assembly:
• No physical cracks or mechanical defects.
• No excess oil, dirt, or particles appear on the parts.
• Whip cap and sheath over the mold parting line (flash or offset) is less
than 0.1 mm.
• NiTi extrusion must completely cover the NiTi wire. No uncovered NiTi wire can
be seen from the tube side.
• Proper printing is present (found on the plastic connector).
• Whip cap must be perpendicular to the NiTi wire (maximum of 5°).
• Antenna straw must not appear twisted, cracked, bent, or discolored.
• No gate flash greater than 0.1 mm anywhere on the assembly.
• Feed contact must appear at a 45-degree angle and must be free from damage,
deformation, or unusual bending.
• Straw must be approximately 5.0mm from the end of the split bottom stop.
Cap.
Stubby tower
Feed contact
Connector
Bottom stopper
Straw.
Telescopic tube
Figure 1: Whip antenna assembly
Issue 2 05/2005 ©2005 Nokia Corporation Company Confidential Page 3
Loading...