Nokia 1265 Leitfaden

Nokia Customer Care

1265 (RH-103)

Mobile Terminal

Antenna Description and

Troubleshooting

1265 (RH-103)

Antenna Description and Troubleshooting

Contents Page

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

Visual Quality Requirements.............................................................................3

Failures and Corrective Measures........................................................................... 3

PIFAAntenna.....................................................................................................4

Damaged RF feed point or Ground Pad............................................................4

Damaged IHF Speaker Spring Pins...................................................................5

Obstructed Speaker, RF feed point, and Ground pads ........................................... 5

Grounding of Display Frame..............................................................................6

RF Connector Failure........................................................................................7

1265 (RH-103)

Nokia Customer Care Antenna Description and Troubleshooting

Introduction

The mobile terminal incorporates an internal antenna. This antenna arrangement is

used for Cellular frequency bands. The internal antenna assembly adopts Planar

Inverted-F Antenna (PIFA) structure used for the cellular engine.

Visual Quality Requirements

Following are the minimum acceptable visual quality requirements of the internal

antenna assembly:

zWear gloves to assemble the antenna. Don’t touch the antenna radiator

with bare hands.

zNo visual cracks or mechanical defects.

zNo oil, dirt, or particles are found on the parts.

zRadiator must be aligned with the plastic housing.

zRadiator must be flat with no warping.

zThe length of all pins must be identical and the pins align.

Failures and Corrective Measures

The internal antenna is assembled into the D Cover Assembly as shown in Figure 1.

If no internal antenna is installed, the antenna gain is degraded by more than 20

dB.

zIf the internal antenna is missing, install SAM Module.

zIf the radiator looks damaged obviously, replace it with a new SAM

Module.

Internal Antenna Holder / Carrie

The back of Speaker

Figure 1: D Cover Assembly

1265 (RH-103)

Antenna Description and Troubleshooting

PIFA Antenna

The internal antenna has a planar-inverted F antenna (PIFA) radiator attached to the

plastic carrier. An integrated hand-free (IHF) mini speaker is integrated inside the plastic

carrier.

Figure 2: The top view of internal antenna

Damaged RF feed point or Ground Pad

The two pads of the antenna must properly connect the PWB.

zIf the main antenna’s RF feed pad does not touch the PWB, the antenna

gain degrades by more than 17 dB.

zIf the ground pad of the main antenna does not touch the PWB, the

antenna gain degrades from 0.5 to 1 dB.

zIf either the RF feed pad or ground pad are broken, covered or removed,

such that either pin does not touch the PWB, replace the SAM Module.

zIf either the RF pin or ground pin springs appear damaged, replace the

SAM Module.

RF feed pad

Ground pad

The back of

Speaker

Figure 3: The back view of internal antenna

1265 (RH-103)

Nokia Customer Care Antenna Description and Troubleshooting

Damaged IHF Speaker Spring Pins

In Figure 3, the two contact points on the back of the internal antenna must properly

touch the PWB. If not, no audio signal will emit from the speaker.

Obstructed Speaker, RF feed point, and Ground pads

If any of the RF feed point pad or ground pad is obstructed, removed, or covered,

the antenna pin does not touch the PWB and the antenna performance degrades. If

any of the speaker pads are obstructed, removed, or covered, the speaker’s spring

pins does not touch the PWB and the cellular antenna performance could degrade.

zIf corrosion is present or the pad is missing, replace the PWB.

zIf a pad is obstructed or covered by something, clear and/or clean the

pad.

Speaker pads

Ground pin

RF feed point pin

Figure 4: PWB layout of IHF speaker, RF feed point, and ground pads

1265 (RH-103)

Antenna Description and Troubleshooting

Grounding of Display Frame

The display frame is grounded to the PWB through 2 ground panels. The display

frame grounding needs to touch the PWB. If not, the radio performance will be

impacted.

zIf the clips/tabs do not touch the ground of the PWB, or are corroded, or

are obstructed, replace the LCD Module Shielding Assembly.

Display frame grounding through screw

Display frame grounding tabs

Figure 5: Display assembly ground points

1265 (RH-103)

Nokia Customer Care Antenna Description and Troubleshooting

RF Connector Failure

The RF connector fails when it does not properly connect the RF input terminal to

the RF output terminal during the SMT. If this happens, the antenna gain degrades

by 25 dB. Check this by testing the resistance value between the RF input and RF

output of the RF connector and see if the value is close to zero. If the RF input is

not connected properly to the RF output, replace the RF connector.

Note: Perform the resistance value test without a RF cable attached to the RF

connector. Because the RF connector is also a switch, the RF output is

disconnected from the RF input when a RF cable is inserted into the RF connector.

zRF input terminal – connect to duplexer.

zRF output terminal – connect to the antenna pad through antenna match

circuit.

zRF connector terminal – connect to a RF coaxial cable.

RF output terminal

Figure 6: RF input / output terminal

RF input terminal

Note:

• QSC6010 is underfilled and cannot be replaced.

• Memory IC is underfilled and cannot be replaced.

• The Shielding Cover cannot be reused after removal.

• After using the heatgun, the domesheet is recommended to be replaced.

1265 (RH-103)

Antenna Description and Troubleshooting

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