Grounding Of Display Frame; Rf Connector Failure - Nokia 2125 Troubleshooting Manual

2125/2125i/2126/2126i/2128i (RH-71)
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.
Display frame
grounding
through screws
Display frame
grounding tabs
• If the clips do not touch the PWB, are corroded, or are obstructed, replace the
display frame.

RF Connector Failure

The RF connector fails when it does not properly connect the RF input to the RF output.
If this happens the antenna gain degrades by 25 dB. Check this by testing for DC
conductivity between the RF input and RF output of the RF connector.
Note: Perform the DC conductivity test without a cable attached to the RF
connector. Because the RF connector is also a switch, the RF output is disconnected
from the RF input when a cable is inserted into the RF connector.
• RF input - Connector to the duplexer
• RF output - Connects to the antenna pad through vias
• RF connector - Connects to a coaxial cable
If the RF input is not connected properly to the RF output, replace the RF connector.
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Figure 6: Display assembly ground points
©2005 Nokia Corporation
Company Confidential ISSUE 1 08/2005