Nokia RH-34 Series Guide

CCS Technical Documentation
RH-34 Series Transceivers
Issue 1 11/2003 Confidential ©2003 Nokia Corporation
Troubleshooting - Antennas

RH-34
Troubleshooting - Antennas CCS Technical Documentation
Page 2 ©2003 Nokia Corporation Confidential Issue 1 11/2003
Contents
Page No
Troubleshooting - Antennas........................................................................................... 3
Failures and Corrective Measures ...............................................................................3
Appearance of phone................................................................................................. 3
Missing internal antenna or antenna radiator............................................................ 3
Missing GPS antenna................................................................................................ 4
RF feed pin/ground pin, IHF speaker pins in C-cover missing or damaged............. 5
Damaged GPS feed or ground pin............................................................................. 5
Wrong internal antenna installed............................................................................... 5
Obstructed RF feed and ground pads, GPS feed and ground pads, IHF speaker pads.. 6
CDMA or GPS RF connector failure........................................................................ 6
RH-34 Display Assembly.......................................................................................... 8
Missing or damaged baseband shield...................................................................... 10

CCS Technical Documentation Troubleshooting - Antennas
RH-34
Issue 1 11/2003 Confidential ©2003 Nokia Corporation Page 3
Troubleshooting - Antennas
This troubleshooting guide addresses potential failures that will affect the antenna per-
formance of the RH-34 phone, and discusses methods for correction of these failures.
Failures and Corrective Measures
Appearance of phone
Figure 1: Front and back views of the RH-34 (6585) phone
Missing internal antenna or antenna radiator
Figure 2: RH-34 (6585) phone with and without antenna cap
Antenna cap
Antenna cap
is missing

RH-34
Troubleshooting - Antennas CCS Technical Documentation
Page 4 ©2003 Nokia Corporation Confidential Issue 1 11/2003
Figure 3: RH-34 (6585) antenna cap with and without radiator
If the antenna cap is missing or there is a cap but it has no radiator, install a new
antenna cap with radiator. If the radiator looks obviously damaged (dents, corrosion) or
the slot in the radiator has a significantly different shape, then install a new antenna cap
with correct radiator.
If no antenna or no radiator is installed, the antenna gain will be degraded by more than
25 dB.
Missing GPS antenna
Figure 4: Back view of RH-34 (6585) C-cover with GPS antenna assembled
If GPS antenna is missing, install a new GPS antenna. If the GPS antenna looks obviously
damaged, replace the antenna with a new one.
Antenna
radiato
r
GPS antenna
RF ground
p
o
g
o
p
in
RF feed
p
o
g
o
p
i
n

CCS Technical Documentation Troubleshooting - Antennas
RH-34
Issue 1 11/2003 Confidential ©2003 Nokia Corporation Page 5
RF feed pin/ground pin, IHF speaker pins in C-cover missing or damaged
Figure 5: Inside view of the C-cover
Two pogo pins are inserted in the C-cover. One end of the pogo pin (in Figure 4) touches
the antenna, the other end (in Figure 5) touches the pad on the PWB. If either of the
pogo pins is missing, or either of the pogo pins is obviously damaged (stuck in the
C-cover plastic tube, lose the inside spring force), the antenna will lose the contact to
the PWB. Replace the whole C-cover assembly with a correct new one.
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 PW,B then the antenna gain may degrade
about 5 to 10 dB.
If either of the IHF speaker pins is damaged or missing, the speaker will not connect to
PWB. Antenna PCS gain will drop 2 dB. The C-cover assembly should be replaced.
Damaged GPS feed or ground pin
As shown in Figure 5, if either the GPS antenna feed or the ground leg is broken, or bent
such that either pin will not touch the PWB, then the GPS antenna should be replaced
with a new one.
Wrong internal antenna installed
Figure 6: Top view of RH-34 (6585) antenna vs. Jacqueline antenna
GPS antenna
ground leg
GPS antenna
feed leg
IHF speaker
p
o
g
o
p
ins
RF ground
p
o
g
o
p
in
RF feed
p
o
g
o
p
i
n
Jacqueline
antenna

RH-34
Troubleshooting - Antennas CCS Technical Documentation
Page 6 ©2003 Nokia Corporation Confidential Issue 1 11/2003
The RH-34 (6585) antenna and the Jacqueline antenna caps are similar in appearance.
The radiators are totally different.
If the wrong antenna is installed, install the correct one.
Obstructed RF feed and ground pads, GPS feed and ground pads, IHF speaker pads
Figure 7: PWB layout of RF feed/ground pads, GPS feed/ground pads, and IHF speaker pads
If the RF feed pad is obstructed, removed, or covered, then the internal antenna feed
pogo 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 pogo pin
will not touch the PWB and the antenna gain will degrade more than 5dB. If corrosion is
present or the pad is missing, then most likely the PWB and phone needs to be replaced.
If either pad is obstructed or covered, the pad should be cleared and/or cleaned.
If the GPS feed pad is obstructed, removed, or covered, then the GPS antenna feed leg
will not touch the PWB. If the ground pad is obstructed, removed, or covered, then the
ground spring clip will not touch the PWB.
If the Internal Hands Free (IHF) speaker pads are obstructed, removed, or covered, then
the IHF speaker will not produce sound. The antenna PCS gain will be degraded by about
2 dB. If corrosion is present or the pad is missing, then most likely the PWB and phone
needs to be replaced. If either pad is obstructed or covered, the pad should be cleared
and/or cleaned.
CDMA or GPS RF connector failure
CDMA and GPS use the same type of RF connector. The RF connector could fail by not
connecting the RF input to the RF output of the RF connector. If this happens to the
CDMA RF connector, then the antenna gain will degrade by about 25 dB. If this happens
to GPS RF connector, the GPS antenna gain will degrade by about 20 dB. This can be
checked by testing for DC conductivity between the RF input and RF output of the RF
connector. Note the DC conductivity test must be done without any cable attached to
Internal Feed
p
ad
Internal
g
round
p
ad
CDMA RF
connector
GPS RF
connector
GPS Feed
p
ad
GPS ground
p
ad
IHF speaker
p
ads

CCS Technical Documentation Troubleshooting - Antennas
RH-34
Issue 1 11/2003 Confidential ©2003 Nokia Corporation Page 7
the RF connector. Since the RF connector is also a switch, the RF output will be discon-
nected from the RF input when a cable is inserted into the RF connector. When a cable
is not inserted, the RF input is connected to the RF connector. The locations of both RF
connectors are shown in Figure 7.
• CDMA RF input — connects to duplexor
• CDMA RF output — connects to antenna pad through vias
• GPS RF input — connects to GPS ceramic filter output
• GPS RF output — connects to GPS antenna-matching circuits
• RF connector — connects to coaxial cable
If the RF input is not connected properly to the RF output, then the RF connector must
be replaced.

RH-34
Troubleshooting - Antennas CCS Technical Documentation
Page 8 ©2003 Nokia Corporation Confidential Issue 1 11/2003
RH-34 Display Assembly
Grounding of the display shield and frame
Figure 8: RH-34 phone display assembly
Figure 9: Side view of RH-34 display assembly
The display shield is connected to the display frame plated area (screw boss area) and
then to the PWB through the two top screws. The grounding of the display shield and
frame will impact the radiation performace of the phone. If the screws are loose, then
tighten them. If the screw bosses are stripped, then the chassis will need to be replaced.
If the screws are missing, install new ones.
If the display frame plated area is cracked or the metal plating has peeled off, then the
gounding of the display shield and frame will not be guaranteed. Replace the frame.
Grounded
p
ositio
n
Display
shiel
d
Display
shiel
d
Display Frame
p
lated are
a
Display
Frame

CCS Technical Documentation Troubleshooting - Antennas
RH-34
Issue 1 11/2003 Confidential ©2003 Nokia Corporation Page 9
Wrong display assembly installed
Figure 10: Side view of RH-34 and RH-27 display assembly
Figure 11: Back view of RH-34 and RH-27 display assembly
Display assemblies of RH-34 (6585) and RH-27 (6225) are very similar. However, the
RH-27 display shield is different on the side from the RH-34 shield, as shown in
Figure 10 inside the blue dashed line. Second, the metal plating at the top area of the
RH-27 frame is different from the top of the RH-34 frame, as shown in Figure 11 inside
the blue dashed line. For RH-34 frame, the screw boss area is plated but isolated from
the rest of the frame, and also there is no plating in the area inside the green dashed line
in Figure 11. For the RH-27 frame, the whole top area is fully plated.
If the wrong display shield or frame is installed, replace it with a correct one.
RH-34
Display
s
hi
e
l
d
RH-27
Display
shield
RH-27 Display
frame plating
N
o plating
RH-34 Display
frame plating

RH-34
Troubleshooting - Antennas CCS Technical Documentation
Page 10 ©2003 Nokia Corporation Confidential Issue 1 11/2003
Missing or damaged baseband shield
Figure 12: RH-34 baseband shield assembly
Baseband shield is part of the display assembly. If the baseband shield is missing or is
obviously damaged, the radiated phone performace will be impacted. Install a new base-
band shield.
without
baseband
shield
RH-34
baseband
s
hi
e
l
d