Nokia 7088 Operating instructions
Nokia Customer Care
7088 (RM-219)
Mobile Terminal
Antenna Description and
Troubleshooting
Issue 12/2006 Company Confidential ©2006 Nokia Corporation
7088 (RM-219)
Antenna Description and Troubleshooting
Contents Page
Introduction................................................................................................................3
Visual Quality Requirements.............................................................................3
Failures and Corrective Measures............................................................................3
Internal Antenna................................................................................................4
Damage of the antenna feeding pins.................................................................4
Obstruction of the RF signal path..............................................................................5
RF Connector Failure........................................................................................6
Page 2 ©2006 Nokia Corporation Company Confidential Issue 12/2006
7088 (RM-219)
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, and it is embedded
invisibly in a mechanical part.
Visual Quality Requirements
Followings are the minimum acceptable visual quality requirements of the internal
antenna assembly:
No visual cracks or mechanical defects.
No oil, dirt, or particles on the parts.
No paint drops on the mechanical appearance.
Good elasticity for two feeding pins (signal and ground pins).
Invisibility for the antenna at any condition.
Failures and Corrective Measures
Figure 1 shows the D Cover antenna assembly. The internal antenna is a sticker
type flex film mounted on the D Cover, and there is an antenna decoration on top of
it. D Cover, antenna, and antenna decoration are with the same color (shown in
Figure 1 are all black). Thus, ideally the antenna is invisible.
If the appearance of the antenna decoration looks damaged or peeled off,
replace it with a new antenna decoration.
Antenna zone
If the antenna can be seen at some condition, remove the current antenna
decoration, and stick a new one on its proper position.
Antenna decoration
D Cover
Figure 1: D Cover Assembly
Issue 12/2006 ©2006 Nokia Corporation Company Confidential Page 3
7088 (RM-219)
Antenna Description and Troubleshooting
Internal Antenna
The internal antenna receives and transmits the signal by the contact between two
feeding pins of the D Cover and the feeding pads on the PWB. Figure 2 shows the
feeding pins (signal and ground pins) and their corresponding feeding pads. Two
feeding pins must contact fully with their corresponding pads on the PWB. If one of
the connections is malfunction, the antenna performance could be degraded by
more than 20dB.
Signal pin Ground pin Ground pad Signal pad
Figure 2: The connection structure for D Cover assembly and PWB
Damage of the antenna feeding pins
The two feeding pins must properly connect to their corresponding pads on the
PWB.
If one of the connections is malfunction, the antenna performance could
be degraded by more than 20dB.
If one of these two pins lacks for elasticity, change the D Cover assembly.
If the DC resistance between these two pins is more than 0.5 ohm,
change the D Cover assembly.
If one of these two feeding pins is broken or bent, change the D Cover
assembly.
Page 4 ©2006 Nokia Corporation Company Confidential Issue 12/2006
7088 (RM-219)
Nokia Customer Care Antenna Description and Troubleshooting
Obstruction of the RF signal path
If the RF signal path is obstructed, broken, damaged, the cellular antenna
performance degrades.
If the obstruction, damage of signal path happens, replace the PWB.
If one of the components at the matching circuit is missing, broken,
replace proper component according to the latest reference document.
If the DC resistance between signal pad and the output port of RF switch
is more than 1 ohm, replace the PWB.
Figure 3: PWB layout of RF feeding path
Signal pad Output port of RF switch
Matching circuit
Issue 12/2006 ©2006 Nokia Corporation Company Confidential Page 5
7088 (RM-219)
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 ports 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
matching circuit.
RF connector terminal – connect to a RF coaxial cable.
RF output terminal RF input terminal
RF input terminal
Figure 4: RF input / output terminal
Note:
• MSM6025 is underfilled and cannot be replaced.
• Memory IC is underfilled and cannot be replaced.
• The Baseband Shielding Cover Assy and RF Shielding Cover cannot be
reused after removal.
• After using the heatgun, replace the domesheet
Page 6 ©2006 Nokia Corporation Company Confidential Issue 12/2006
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