Grounding Of Display Frame; Testing The Cdma Antenna; Calibration Factors - Nokia 6235 Antenna Description And Troubleshooting

6235/6235i/6236i (RM-60)
Antenna Description and Troubleshooting

Grounding of Display Frame

The display frame is grounded to the PWB through two ground panels. The display frame
grounding impacts the radiation performance of the mobile terminal.
Check for the following problems:
• If the clips are not touching the PWB, or are corroded, obstructed, then the
display frame should be replaced.
• If the screws are loose then tighten them.
• If the screws are missing, install new ones.
the display frame ground clips and the PWB in greater detail.
• If any portion of the metal display frame is damaged, or if the metal display
frame is not properly attached to the rest of the display assembly, then this
display assembly must be replaced with a good one.

Testing the CDMA Antenna

Calibration Factors

Define the AMS RF coupler CPL-8 calibration numbers using the test adapter DA-54.
Obtain the calibration numbers by utilizing a mobile terminal with known RF and
antenna performance. Each test adapter should only require a single calibration on
PCS1900 and GPS bands at used test frequencies. Additional calibrations should only be
needed if the test adapter is substantially modified (reassembled, changed parts,
dropped, etc.).
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Display frame grounding
through screws
Figure 6: Display assembly ground points
©2005 Nokia Corporation
Display frame
grounding tabs
Figure 6 shows the contact between
Company Confidential Issue 1 04/2005