Nokia RH-77 Troubleshooting Manual
Antenna description and troubleshooting
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Also See for RH-77:
- Manual (12 pages) ,
- Disassembly/assembly (8 pages) ,
- Troubleshooting manual (42 pages)
Related Manuals for Nokia RH-77
Summary of Contents for Nokia RH-77
- Page 1 Nokia Customer Care 2118 (RH-77) Mobile Terminal Antenna Description and Troubleshooting ©2005 Nokia Corporation Issue 01 04/2005 Company Confidential...
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Page 2: Table Of Contents
2118 (RH-77) Antenna Description and Troubleshooting Nokia Customer Care Contents Page Introduction ..............................3 Internal Antenna is Missing ........................3 Damaged RF Feed Pin or Ground Pin ..................... 4 Wrong Internal Antenna is Installed ...................... 4 Obstructed RF Feed or Ground Pads for Internal Antenna or IHF Speaker Pads ....... 5 Grounding of Display Frame ........................ -
Page 3: Introduction
Radiator Figure 2: Top (left) and bottom (right) views of the 2118 (RH-77) internal antenna If the RF feed does not touch the PWB, then the antenna gain will degrade by more than 25dB. If the ground pin does not touch the PWB, then the antenna gain may degrade from 5—10 dB. -
Page 4: Damaged Rf Feed Pin Or Ground Pin
• Either of the IHF speaker pins is damaged or if the IHF speaker is nonfunctioning Wrong Internal Antenna is Installed Figure 3: Top views of the 3100 (RH-19) (left) and 2118 (RH-77) (right) antennas The 2118 and 3100 antennas are similar in appearance. The important visual difference in the antennas is that the slot pattern is very different. -
Page 5: Obstructed Rf Feed Or Ground Pads For Internal Antenna Or Ihf Speaker Pads
2118 (RH-77) Nokia Customer Care Antenna Description and Troubleshooting 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 5: PWB layout of RF feed and ground pads and IHF speaker pads If the RF feed pad is obstructed, removed, or covered, the RF feed pin will not touch the PWB and the antenna gain will degrade by more than 25 dB. -
Page 6: Grounding Of Display Frame
2118 (RH-77) Antenna Description and Troubleshooting Nokia Customer Care Grounding of Display Frame Ungrounded screw Grounded screw RF connector Grounded screw Ungrounded screw Figure 6: Display assembly Note that the display frame is grounded to the PWB through the two top screws. The grounding of the display frame impacts the radiation performance of the mobile terminal. -
Page 7: Ruim Card Flap Grounding
2118 (RH-77) Nokia Customer Care Antenna Description and Troubleshooting RUIM Card Flap Grounding RF shield Conductive sticker RUIM card flap Figure 7: 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... - Page 8 2118 (RH-77) Antenna Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 8 Company Confidential Issue 01 04/2005...