CC Technical Documentation RM-11 Series Transceivers Troubleshooting - Antennas Issue 1 02/2004 Confidential ©2004 Nokia Corporation
RM-11 Troubleshooting - Antennas CC Technical Documentation Contents Page Troubleshooting - Antennas........................................................................................... 3 Failures and Corrective Measures ...............................................................................3 Missing Internal Antenna Cap .....................................................................................4 Missing Antenna Radiator............................................................
CC Technical Documentation RM-11 Troubleshooting - Antennas Troubleshooting - Antennas This troubleshooting guide addresses potential failures that can affect the antenna performance of the RM-11 phone, and discusses methods for correction of these failures.
RM-11 Troubleshooting - Antennas CC Technical Documentation Missing Internal Antenna Cap Internal antenna Antenna slot Antenna cap is missing Antenna cap Figure 2: RM-11 phone with a missing internal antenna cap Missing Antenna Radiator Antenna radiator Figure 3: RM-11 phone with a missing antenna radiator If the antenna cap is missing or if there is a cap without a radiator, install a new antenna cap with a radiator. If the radiator looks obviously damaged (i.e.
RM-11 Troubleshooting - Antennas CC Technical Documentation Missing GPS Antenna, Damaged GPS Feed/Ground Pin, or Damaged Heat Stake GPS ground pin GPS antenna GPS feed pin Heat stake of GPS antenna Figure 4: Back view of RM-11 (3205) C-cover with GPS antenna assembled The RM-11 GPS antenna is heat-staked to the C-cover.
RM-11 Troubleshooting - Antennas CC Technical Documentation Two pogo pins are inserted in the C-cover. One end of the pogo pin touches the antenna, the other end touches the pad on the PWB (see Figure 5). If either of the pogo pins is missing or obviously damaged (i.e., stuck in the C-cover plastic tube, loose the inside spring force), the antenna will lose the contact to the PWB. In this case, replace the C-cover assembly with a new one.
RM-11 Troubleshooting - Antennas CC Technical Documentation If the Internal Hands Free (IHF) speaker pads are obstructed, removed, or covered, then the IHF speaker will not produce sound. The antenna PCS gain will be degraded by about 2 dB. If corrosion is present or the pad is missing, replace the PWB and phone. If either pad is obstructed or covered, clear or clean the pad. CDMA or GPS RF Connector Failure CDMA and GPS use the same type of RF connector.
RM-11 Troubleshooting - Antennas CC Technical Documentation Display Assembly Grounded position Display frame plated area Display frame Display shield Figure 7: RM-11 display assembly (top) and side view (bottom) First, the display shield is connected to the display frame plated area (screw boss area), and then to the PWB through the two top screws. The grounding of the display shield and frame impact the radiation performance of the phone. If the screws are loose, tighten them.
CC Technical Documentation RM-11 Troubleshooting - Antennas Wrong Display Assembly Installed RM-11 display shield RH-34 display shield Figure 8: Side view of RH-34 and RM-11 display assembly No plating RM-11 display frame plating RH-34 display frame plating Figure 9: Back view of RH-34 and RM-11 display assembly The RH-34 (6585) and RM-11 (3205) display assemblies are very similar. However, the side of the RM-11 display shield is different than the side of the RH-34 display shield (see Figure 8).
RM-11 Troubleshooting - Antennas CC Technical Documentation Missing or Damaged Baseband Shield RM-11 baseband shield RM-11 without baseband shield Figure 10: Baseband shield for the RM-11 The baseband shield is part of the display assembly. If the baseband shield is missing or is obviously damaged, the radiated phone performance will be impacted. Check the spring fingers on the baseband shield to ensure that they are raised up so that they make contact with the PWB when installed.
