Nokia RH-17 Series Guía

CCS Technical Documentation

RH-17 Series Transceivers

Issue 1 04/2003 Confidential Nokia Corporation

Troubleshooting — Antennas

RH-17

Troubleshooting — Antennas CCS Technical Documentation

Page 2 Nokia Corporation Confidential Issue 1 04/2003

CCS Technical Documentation Troubleshooting — Antennas

RH-17

Issue 1 04/2003 Nokia Corporation Confidential Page 3

Contents Page No

Troubleshooting - Antennas........................................................................................... 5

Appearance of the Phone .............................................................................................5

Failures and Corrective Measures ...............................................................................6

Missing Internal Antenna or Whip Antenna ............................................................. 6

Damaged RF Feed Pin or Ground Pin....................................................................... 6

Wrong Internal Antenna Installed............................................................................. 7

Obstructed RF Feed and Ground Pads for the Internal Antenna............................... 8

Broken or Missing Antenna Clip .............................................................................. 8

Obstructed Whip Stopper.......................................................................................... 9

Grounding of Display Frame..................................................................................... 9

Misinstalled Whip................................................................................................... 12

Damaged Whips...................................................................................................... 12

Detuning Circuit for Bottom Antenna Clip............................................................. 12

RF Connector Failure.............................................................................................. 13

RH-17

Troubleshooting — Antennas CCS Technical Documentation

Page 4 Nokia Corporation Confidential Issue 1 04/2003

CCS Technical Documentation Troubleshooting — Antennas

RH-17

Issue 1 04/2003 Nokia Corporation Confidential Page 5

Troubleshooting - Antennas

This troubleshooting guide addresses potential failures that will affect the antenna per-

formance of the RH-17 phone, and how to correct these failures.

For additional information, refer to Haukka Antenna RF Specifications and Plan

(DHS02290-EN-1.0)

Appearance of the Phone

Figure 1: Front of RH-17

Figure 2: Back of RH-17

Figure 3: Back and Top of RH-17

Note in Figure 3 that when the whip antenna is properly installed, the cap “clicks” into

the D-cover when the whip is fully retracted.

RH-17

Troubleshooting — Antennas CCS Technical Documentation

Page 6 Nokia Corporation Confidential Issue 1 04/2003

Failures and Corrective Measures

Missing Internal Antenna or Whip Antenna

Figure 4: RH-17 D-cover assembly

Note that the whip antenna must be inserted prior to inserting the internal antenna.

If the internal antenna is missing, install one. If the radiator looks obviously damaged,

then replace the internal antenna.

If no antenna is installed, the antenna gain will be degraded by more than 25 dB.

If the whip antenna is missing, then remove the internal antenna, install a whip, and

reinstall the internal antenna.

Damaged RF Feed Pin or Ground Pin

Figure 5: Top and Bottom View of the RH-17 Internal Antenna

If either the RF feed pin or ground pin are broken, or bent such that either pin will not

touch the PWB, then the internal antenna must be replaced. If the springs for the RF or

ground pin appear damaged, then the internal antenna must be replaced. If the slot in

CCS Technical Documentation Troubleshooting — Antennas

RH-17

Issue 1 04/2003 Nokia Corporation Confidential Page 7

the radiator has a significantly different shape, then the correct internal antenna must

be installed. Be aware that the shape of the slot can vary slightly. The length of the hor-

izontal slot can vary by a few millimeters, because the antennas are tuned for each batch

of plastic frames. If there is any other obvious damage to the radiator (dents, corrosion),

then the antenna should be replaced. If the pin gets stuck or has excessive friction in the

plastic tube/guiding feature, then the spring will not work properly, and the antenna

should be replaced.

If the RF feed doesn’t touch the PWB, then the antenna gain will degrade by more than

25 dB. If the ground pin doesn’t touch the PWB, then the antenna gain may degrade

about 5 dB to 10 dB.

Wrong Internal Antenna Installed

Figure 6: Top and bottom view of RH-3 antenna

The RH-17 and RH-3 antennas share the same mechanical interface with the D-cover. As

a result, either antenna may be installed in either phone. The important differences visu-

ally in the antennas are that the slot pattern is very different, and there also is a GPS

antenna present in the RH-3 which is absent in the RH-17.

If the wrong antenna is installed, install the correct one.

Installing an RH-3 antenna in the RH-17 phone will change the antenna gain by a few

dB at 850 MHz, and the phone will not be compliant with FCC submission. Installing a

RH-17 antenna in a RH-3 phone will degrade the PCS performance by at least 6 dB, as

the RH-17 antenna is not tuned for PCS. In addition, if an RH-17 antenna is installed in

the RH-3, GPS will degrade by about 25 dB as the RH-17 doesn’t have a GPS antenna.

RH-17

Troubleshooting — Antennas CCS Technical Documentation

Page 8 Nokia Corporation Confidential Issue 1 04/2003

Obstructed RF Feed and Ground Pads for the Internal Antenna

Figure 7: PWB layout of RF feed and ground pads, and bottom antenna clip

If the RF feed pad is obstructed, removed, or covered, then the RF feed pin will not touch

the PWB and then the antenna gain will degrade by more than 25 dB. If the ground pad

is obstructed, removed, or covered, then the ground pin will not touch the PWB, and then

the antenna gain may degrade about 5 to 10 dB. If corrosion is present or the pad is

missing, then most likely the PWB and phone needs to be replaced. In either pad is

obstructed or covered, the pad should be cleared and/or cleaned.

Broken or Missing Antenna Clip

Figure 8: Bottom antenna clip

If the bottom antenna clip does not contact the whip stopper, when the whip is fully

retracted, then the internal antenna gain will degrade by about 4-5 dB in the RX portion

of CELL band. If the antenna clip is installed backwards, is damaged, or is missing, then

install a new bottom antenna clip in the correct position.

CCS Technical Documentation Troubleshooting — Antennas

RH-17

Issue 1 04/2003 Nokia Corporation Confidential Page 9

Obstructed Whip Stopper

Figure 9: Whip stopper as shown when the whip is fully retracted

If the whip stopper is corroded or blocked by the whip straw, then the whip assembly

needs to be replaced. If the whip stopper is obstructed or dirty, then the obstruction

and/or dirt needs to be removed. If the whip stopper doesn't properly contact the bot-

tom antenna clip, then the internal antenna gain will degrade by about 4-5 dB in the RX

portion of CELL band.

Grounding of Display Frame

Figure 10: Display assembly

Note that the display frame is grounded to the PWB through the two ground clips. The

grounding of the display frame will impact the radiation performance of the phone. If

the clips are not touching the PWB, or are corroded, or obstructed, then the display

frame should be replaced.

RH-17

Troubleshooting — Antennas CCS Technical Documentation

Page 10 Nokia Corporation Confidential Issue 1 04/2003

The following figures show the contact between the display frame ground clips and the

PWB in greater detail.

Figure 11: Ground clip on the left side of the display frame

Figure 12: Ground clip on the right side of the display frame

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