Nokia 6088 Leitfaden

Nokia Customer Care

6088 (RM-218)

Mobile Terminal

Antenna Description and

Troubleshooting

6088 (RM-218)

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 Pins...........................................................4

Damaged IHF Speaker Spring Pins...................................................................4

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

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

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

6088 (RM-218)

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:

 Wear gloves to assemble the antenna. Don’t touch the antenna radiator

with bare hands.

 No visual cracks or mechanical defects.

 No oil, dirt, or particles are found on the parts.

 Radiator must be aligned with the plastic housing.

 Radiator must be flat with no warping.

 The 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.

 If the internal antenna is missing, install SAM Module.

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

Module.

Internal Antenna Holder / Carrie

The back of earphone jack

The back of Speaker

Figure 1: D Cover Assembly

6088 (RM-218)

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 to the pogo-pin on PWB.

 If the main antenna’s RF feed pad does not touch the pogo-pin on PWB,

the antenna gain degrades by more than 17 dB.

 If the ground pad of the main antenna does not touch pogo-pin on PWB,

the antenna gain degrades from 0.5 to 1 dB.

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

such that either pad does not touch the pogo-pin on PWB, replace the

SAM Module.

Earphone jack holder

speaker contact pins

Ground pad RF feed pad

Figure 3: The back view of internal antenna

Damaged IHF Speaker Spring Pins

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

6088 (RM-218)

Nokia Customer Care Antenna Description and Troubleshooting

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

Obstructed Speaker, Pogo-pin

If any of the pogo-pin is obstructed, removed, or covered, the pin does not touch

the pad of SAM module 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.

 If speaker pad is corrosion or the pad is missing, replace the PWB.

 If speaker pad is obstructed or covered by something, clear and/or clean

the pad.

 If the pogo-pin appears damaged or the spring of pogo-pin does not work,

replace the pogo-pin.

Speaker pads

RF feed point pin

Ground pin

Pogo-pin

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

6088 (RM-218)

Antenna Description and Troubleshooting

Grounding of Display Frame

The display frame is grounded to the PWB through 4 ground panels. The display

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

impacted.

 If 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

Figure 5: Display assembly ground points

6088 (RM-218)

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.

 RF input terminal – connect to duplexer.

 RF output terminal – connect to the antenna pad through antenna match

circuit.

 RF connector terminal – connect to a RF coaxial cable.

RF input terminal

RF output terminal

Figure 6: RF input / output terminal

Note:

• MSM6025 is underfilled and cannot be replaced.

• Memory IC is underfilled and cannot be replaced.

• The Shielding Case Assy cannot be reused after removal.

• After using the heatgun, the domesheet needs to be replaced.

6088 (RM-218)

Antenna Description and Troubleshooting

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