CCS Technical Documentation RH-48 Series Transceivers Troubleshooting — Antenna Issue 1 11/2003 Confidential © 2003 Nokia Corporation
RH-48 Troubleshooting — Antenna CCS Technical Documentation Contents Page No Troubleshooting - Antenna ............................................................................................ 3 Relevant Documents ....................................................................................................3 Failures and Corrective Measures ...............................................................................3 Appearance of phone.........................................................
CCS Technical Documentation RH-48 Troubleshooting — Antenna Troubleshooting - Antenna This troubleshooting guide addresses potential failures that will affect antenna performance of the RH-48 phone, and discusses methods for correction of these failures. Relevant Documents C-Max Antenna RF Specifications and Plan (DHS02726-EN-1.
RH-48 Troubleshooting — Antenna CCS Technical Documentation Internal Antenna Missing Figure 3: RH-48 chassis assembly If the internal antenna is missing, install one. If the radiator looks obviously damaged, then replace the internal antenna. If no internal antenna is installed, the antenna gain will be degraded by more than 25dB.
RH-48 Troubleshooting — Antenna CCS Technical Documentation If the RF feed doesn’t touch the PWB, then the antenna gain will degrade by more than 25dB. If the ground pin doesn’t touch the PWB, then the antenna gain may degrade about 5 to 10dB. If either of the IHF speaker pins is damaged or if the IHF speaker is nonfunctioning, then the antenna module should be replaced.
RH-48 Troubleshooting — Antenna CCS Technical Documentation Obstructed RF Feed or Ground Pads for Internal Antenna, or IHF Speaker Pads Pad for ground pin Pad for RF pin IHF speaker pads Figure 7: PWB layout of RF feed and ground pads and IHF speaker pads If the RF feed pad is obstructed, removed, or covered, then the RF feed pin will not touch the PWB and the antenna gain will degrade by more than 25dB.
RH-48 Troubleshooting — Antenna CCS Technical Documentation Grounding of Display Frame Figure 8: Display assembly Note that the display frame is grounded to the PWB through the two top screws. The grounding of the display frame will impact the radiation performance of the phone. If the screws are loose, then tighten them. If the screw bosses are stripped, then the chassis will need to be replaced. If the screws are missing, install new ones.
RH-48 Troubleshooting — Antenna CCS Technical Documentation Grounding of RUIM Card Flap Figure 9: Conductive sticker grounding RUIM card flap to RF shield The RUIM card flap needs to be grounded to the RF shield with a conductive sticker. The shape and location of the conductive sticker is shown in the figure above. If the conductive sticker is missing or ripped, it needs to be replaced. If the sticker is damaged or missing, then the radiated sensitivity could be reduced by 4-8dB.
