Nokia 2125 Troubleshooting Manual
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Also See for 2125:
- User manual (169 pages) ,
- Troubleshooting manual (50 pages) ,
- Disassembly/assembly (8 pages)
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Summary of Contents for Nokia 2125
- Page 1 Nokia Customer Care 2125/2125i/2126/2126i/2128i (RH-71) Mobile Terminals Antenna Description and Troubleshooting ©2005 Nokia Corporation ISSUE 1 08/2005 Company Confidential...
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Page 2: Table Of Contents
2125/2125i/2126/2126i/2128i (RH-71) Antenna Description and Troubleshooting Contents Page Introduction ..............................3 Visual Quality Requirements ........................3 Failures and Corrective Measures ......................4 PIFA Antenna ..............................4 Damaged RF Feed or Ground Pins......................5 Damaged IHF Speaker Pogo Pins......................5 Wrong Internal Antenna Installed ....................... 5 Obstructed IHF Speaker, RF Feed, and Ground Pads................ -
Page 3: Introduction
2125/2125i/2126/2126i/2128i (RH-71) Nokia Customer Care Antenna Description and Troubleshooting Introduction The mobile terminal incorporates an internal antenna. This antenna arrangement is used for AMPS/Cell and PCS frequency bands. The internal antenna assembly consists of a Planar Inverted-F Antenna (PIFA) used for the cellular engine and an Inverted-F antenna (IFA) used for the GPS engine, which is placed on the side of internal antenna body. -
Page 4: Failures And Corrective Measures
2125/2125i/2126/2126i/2128i (RH-71) Antenna Description and Troubleshooting Failures and Corrective Measures The internal antenna is assembled into the D-cover as shown in Figure 1. If no internal antenna is installed, the antenna gain is degraded by more than 25 dB. Internal antenna... -
Page 5: Damaged Rf Feed Or Ground Pins
2125/2125i/2126/2126i/2128i (RH-71) Nokia Customer Care Antenna Description and Troubleshooting Damaged RF Feed or Ground Pins The main antenna and the GPS antenna have pins (spring clips) that must properly touch the PWB. • If the main antenna’s RF feed pin does not touch the PWB, the antenna gain degrades by more than 25 dB and the GPS antenna is detuned. - Page 6 2125/2125i/2126/2126i/2128i (RH-71) Antenna Description and Troubleshooting • Models 2125i, 2126i and 2128i include a GPS antenna. Models 2125 and 2126 do not. Note: GPS is functional only in the Models 2125i, 2126i and 2128i. • The main radiators for the 2125i, 2126i and 2128i include markings that begin with an “F”.
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Page 7: Obstructed Ihf Speaker, Rf Feed, And Ground Pads
2125/2125i/2126/2126i/2128i (RH-71) Nokia Customer Care Antenna Description and Troubleshooting Obstructed IHF Speaker, RF Feed, and Ground Pads Ground pad for GPS antenna RF feed pad for GPS antenna IHF speaker pads Ground pad for main antenna RF feed pad for main... -
Page 8: Grounding Of Display Frame
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... -
Page 9: Uim Card Flap Grounding
2125/2125i/2126/2126i/2128i (RH-71) Nokia Customer Care Antenna Description and Troubleshooting UIM Card Flap Grounding The UIM card flap must be grounded to the RF shield with a conductive sticker. Disassembling the RF shield from the chassis damages the sticker. You must remove the sticker to change the antenna module or the UIM card flap. -
Page 10: Testing The Cdma Antenna
2125/2125i/2126/2126i/2128i (RH-71) Antenna Description and Troubleshooting Testing the CDMA Antenna Calibration Factors Use the MJF-28 Docking Station Adapter to define the CPL-8 Antenna Coupler calibration numbers. Obtain the calibration numbers by utilizing a mobile terminal with known RF and antenna performance. Each test adapter should only require a single calibration on PCS1900 and GPS bands at used test frequencies. -
Page 11: Testing The Gps Antenna (Models 2125I, 2126I, 2128I)
2125/2125i/2126/2126i/2128i (RH-71) Nokia Customer Care Antenna Description and Troubleshooting Testing the GPS Antenna (Models 2125i, 2126i, 2128i) Calibration Factor for GPS In GPS test mode 3, the GPS receiver is fed with a CW signal. The GPS receiver should report C/No ratio of 35 dBHz with a -110 dBm signal level on the RF connector (-110 dBm + cable loss) at signal generator output. - Page 12 2125/2125i/2126/2126i/2128i (RH-71) Antenna Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 12 Company Confidential ISSUE 1 08/2005...