Nokia 2366i - Cell Phone - Verizon Wireless Leitfaden

Nokia Customer Care

2366i (RM-155)

Mobile Terminals

Issue 2 - February 2007 Company Confidential

Antenna Description and

Troubleshooting

2366i (RM-155)

Antenna Description and Troubleshooting Nokia Customer Care

Page 2 Company Confidential Issue 2 - February 2007

Contents Page

Introduction ..................................................................................................................................................... 3

CDMA Antenna Assembly............................................................................................................................. 4

Remove the CDMA Antenna Assembly ..................................................................................................5

Circuit Description ......................................................................................................................................6

Damaged RF Feed Contact ........................................................................................................................6

Damaged RF Connector .............................................................................................................................7

GPS Antenna .................................................................................................................................................... 8

Expose the GPS Antenna Circuits ...........................................................................................................8

Malfunctions .................................................................................................................................................8

GPS Matching Components ......................................................................................................................9

Bluetooth Antenna...................................................................................................................................... 11

Nokia Customer Care Antenna Description and Troubleshooting

2366i (RM-155)

Issue 2 - February 2007 Company Confidential Page 3

Introduction

This chapter addresses potential failures that affect antenna performance of the 2366i

mobile terminals and discusses methods for correction of these failures. There are three

serviceable antennas used in the 2366i mobile terminal:

• CDMA antenna (a dual-band stub antenna)

• GPS antenna (mounted to the main PWB)

• Bluetooth antenna (a printed trace on the main PWB)

The following sections describe these antennas and their connections to the mobile

terminal components.

2366i (RM-155)

Antenna Description and Troubleshooting Nokia Customer Care

Page 4 Company Confidential Issue 2 - February 2007

CDMA Antenna Assembly

You can disconnect the dual-band CDMA antenna assembly. Partial disassembly of the

mobile terminal is required to remove and replace the CDMA antenna assembly. (See the

Disassembly and Assembly chapters for instructions.) When installed, a T-shaped locking

tab on the antenna assembly engages two locking ramps molded into the D-cover and an

electrical spring clip contact connects to a pad on the main PWB. Figure 1 shows the

antenna assembly and its mounting arrangement.

Figure 1: CDMA Antenna Assembly and mounting arrangement

Figure 2: Antenna Contact Pad

Antenna pogo pins

Locking

ramps Spring Clip Contact

Locking Tab CDMA Antenna

Assembly

Antenna Contact Pad

Nokia Customer Care Antenna Description and Troubleshooting

2366i (RM-155)

Issue 2 - February 2007 Company Confidential Page 5

Remove the CDMA Antenna Assembly

Perform the following steps to remove the CDMA Antenna Assembly:

1. Remove the battery cover. Press down on the cover while sliding it away from the

body of the mobile terminal.

Figure 3: Removal of the Battery Cover

2. If installed, remove the battery.

3. Remove the RF grommet.

Figure 4: Antenna Grommet

2366i (RM-155)

Antenna Description and Troubleshooting Nokia Customer Care

Page 6 Company Confidential Issue 2 - February 2007

4. Remove the antenna. Use a dental pick to lift the retaining latch. Do not cause

damage to the contacts.

Figure 5: Disconnection of the Antenna (1)

Figure 6: Disconnection of the Antenna (2)

Circuit Description

Refer to Figure 7. The output of the diplexer is fed through RF connector X7300 and

through a zero-ohm resistor R7358 to the antenna contact pad on the main PWB. The

RF choke L7303 drains static charges to ground, protecting the preceding circuitry from

electrostatic damage (ESD). If a test cable is inserted into RF connector X7300, a

mechanical switch is opened, disconnecting diplexer Z7302 from the antenna contact

pad.

Damaged RF Feed Contact

The CDMA antenna assembly has a metal spring clip that makes contact with an antenna

contact pad on the main PWB. If the spring clip is damaged such that it does not make

contact with the pad, then replace the CDMA antenna assembly. If the pad is damaged,

replace the main PWB. If the contact does not make good contact with the pad, then the

antenna gain is reduced by -25 dB.

Nokia Customer Care Antenna Description and Troubleshooting

2366i (RM-155)

Issue 2 - February 2007 Company Confidential Page 7

Damaged RF Connector

• The RF connector contains a switch. If this switch fails, there is a loss of

continuity between the input to the diplexer and the CDMA antenna, resulting in

a gain reduction of approximately -25 dB.

• Measure the DC continuity through the CDMA RF connector with no cable

connected. See Figure 7 and Figure 8 for the location of this connector. If there is

no DC continuity, replace CDMA RF connector X7300.

Figure 7: CDMA Antenna Circuit

Figure 8: D-cover Removed

CDMA RF Connector

Antenna Contact Pad

2366i (RM-155)

Antenna Description and Troubleshooting Nokia Customer Care

Page 8 Company Confidential Issue 2 - February 2007

GPS Antenna

The GPS Antenna is a ceramic chip soldered onto the Main PWB. The antenna must be

mounted exactly as shown in the figure, or the antenna does not operate correctly. RF

choke L6253 acts as an ESD protection, draining static charges to ground. C6256 tunes

the antenna. When a test connector is inserted into RF Connector X6250, an internal

switch disconnects the filter from the GPS antenna circuits.

Figure 9: GPS Antenna Circuit

Expose the GPS Antenna Circuits

Refer to the Disassembly chapter to remove the D-cover and expose the GPS antenna

circuits for troubleshooting.

Malfunctions

Figure 10 shows the mounting orientation of the GPS antenna and the matching circuits.

Check the following items to troubleshoot the GPS antenna circuits:

• If the GPS antenna looks damaged, or is missing, install a new antenna.

• Check the orientation of the antenna against that shown in Figure 10, and

correctly install a new antenna if the orientation is not correct.

• The RF connector contains a switch. If this switch fails, there is a loss of

continuity between the input to the Filter and the GPS antenna, resulting in a

gain reduction of approximately -20 dB. Measure the DC continuity through the

GPS RF Connector with no cable connected. See Figure 11 for the location of this

connector. If there is no DC continuity, replace GPS RF connector X6250.

GPS RF Connector

RF ChokeTuning Capacitor

Filter

Nokia Customer Care Antenna Description and Troubleshooting

2366i (RM-155)

Issue 2 - February 2007 Company Confidential Page 9

Figure 10: GPS Antenna and mounting arrangement

Figure 11: GPS RF Connector (GPS Antenna removed)

GPS Matching Components

Figure 12 shows the impedance-matching components for the GPS antenna circuit.

Ensure that these components are properly installed and that the correct part number is

used, as value and size are critical.

GPS Antenna

Ground Feed Ground

GPS RF Connector

2366i (RM-155)

Antenna Description and Troubleshooting Nokia Customer Care

Page 10 Company Confidential Issue 2 - February 2007

Figure 12: Matching components—GPS Antenna circuit

6,2 nH, NMP code

3649051

2.2 pF

NMP code

2320523

Front Side Rear Side

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