Nokia 6088 Guide

Nokia Customer Care
6088 (RM-218)
Mobile Terminal
Antenna Description and
Troubleshooting
Issue 1 10/2006 Company Confidential ©2006 Nokia Corporation

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
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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
r
The back of earphone jack
The back of Speaker
Figure 1: D Cover Assembly
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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
Page 4 ©2006 Nokia Corporation Company Confidential Issue 1 10/2006

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
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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
Display frame grounding through screw
Figure 5: Display assembly ground points
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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.
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6088 (RM-218)
Antenna Description and Troubleshooting
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