CCS Technical Documentation RH-27 Series Transceivers Troubleshooting - Antennas Issue 1 11/2003 Confidential ©2003 Nokia Corporation
RH-27 Troubleshooting - Antennas CCS Technical Documentation Contents Page No Troubleshooting - Antennas........................................................................................... 3 Failures and Corrective Measures ...............................................................................3 Appearance of phone................................................................................................. 3 Missing internal antenna or antenna radiator ..................................
RH-27 Troubleshooting - Antennas CCS Technical Documentation Troubleshooting - Antennas This troubleshooting guide addresses potential failures that will affect the antenna performance of the RH-27 phone, and discusses methods for correction of these failures.
RH-27 Troubleshooting - Antennas CCS Technical Documentation Antenna radiator Figure 3: RH-27 (6225) antenna cap with and without radiator If the antenna cap is missing or there is a cap but it has no radiator, install a new antenna cap with radiator. If the radiator looks obviously damaged (dents, corrosion) or the slot in the radiator has a significantly different shape, then install a new antenna cap with correct radiator.
RH-27 Troubleshooting - Antennas CCS Technical Documentation RF feed pin/ground pin, IHF speaker pins in C-cover missing or damaged GPS antenna IHF speaker pogo pins RF ground pogo pin RF feed pogo pin Figure 5: Inside view of the C-cover Two pogo pins are inserted in the C-cover. One end of the pogo pin touches the antenna, the other end (in Figure 5) touches the pad on the PWB.
RH-27 Troubleshooting - Antennas CCS Technical Documentation Obstructed RF feed and ground pads, GPS feed and ground pads, IHF speaker pads GPS ground GPS Feed IHF speaker pad pad pads GPS RF connector Internal ground pad Internal Feed pad CDMA RF connector Figure 6: PWB layout of RF feed/ground pads, GPS feed/ground pads, and IHF speaker pads If the RF feed pad is obstructed, removed, or covered, then the internal antenna feed pogo pin will not touch the PWB and the antenna gain will degrade by more
RH-27 Troubleshooting - Antennas CCS Technical Documentation connectors are shown in Figure 6. CDMA RF input — connects to duplexer CDMA RF output — connects to antenna pad through vias GPS RF input — connects to GPS ceramic filter output GPS RF output — connects to GPS antenna matching circuits RF connector — connects to coaxial cable If the RF input is not connected properly to the RF output, then the RF connector must be replaced.
RH-27 Troubleshooting - Antennas CCS Technical Documentation If the display frame plated area is cracked or the metal plating is peeled off, then the grounding of the display shield and frame will not be guaranteed. Replace the frame.
RH-27 Troubleshooting - Antennas CCS Technical Documentation For the RH-27 frame, the whole top area is fully plated. If the wrong display shield or frame is installed, replace it with a correct one. Missing or damaged baseband shield without baseband shield RH-27 base band shield Figure 10: RH-27 baseband shield assembly Baseband shield is part of the display assembly. If the baseband shield is missing or is obviously damaged, the radiated phone performace will be impacted.
RH-27 Troubleshooting - Antennas Page 10 ©2003 Nokia Corporation CCS Technical Documentation Confidential Issue 1 11/2003
