Note these setting are for the HP 8920 on a duplex test screen.
Tune Mode – ManualAF generator 1KHz Tone - 8Khz deviation
Frequency – 836.52MhzFM Coupling – AC
Input Port – RF INAudio Out – AC
IF Filter – 230kHzAF Anl In – Audio In
Ext. TX Key – OFFFilter 1 CCIT or Cmessage / Filter 2 15Khz LPF
RF signal gen. to 881.52 MHzDe-emphasis – OFF
Amplitude at -116dBmAtten Hold – OFF
Detector – PK+ - / 2Output Port – RF Out
Power Meter Avg. = 10SINAD Avg. = 10
Introduction
The purpose of this section is to define module faults down to component level. The flow charts allow simple
navigation by following YES /NO routes.
Note; Some flow charts have callout boxes referring to appropriate oscilloscope readouts. If you are reading the
PDF version of this document these are hypertext links.
Required Service Equipment
NHA-9 WinTesla Service Software (product code: 8400597)
Variable Power Supply Unit
Digital Multimeter
Oscilloscope
NHA-9 Service Accessories (H700PI, 282)
MJS-7 Test Frame (PN 0775095)
When the phone is in the Module Repair JIG, the probe must be connected to the test equipment.
RS232/MBUS adapter
CMT/Marconi HP8920...
Setup the cable loss:
With the HP8920, Configure > RF level offset on/off = on > RF in/out = loss of the cable.
Note these setting are for the HP 8920 on a TX test screen.
Tune mode – ManualFilter 1 - Cmessage
Set phone to Local mode. Go to Testing Menu enter Quick Testing.
Quicktest set up as follows:
Ex. Audio – ONChannel 384
Compressor – ONSelect RX TX PA
Expander – ONPower Level 7
Volume – MIDAFC – OFF
TX Frequency - 836.52MhzFilter 2 – 15kHz
TX Pwr Meas. – PeakDe-Emphasis - OFF
Input Port – RF INDetector – PK+ - /2
IF Filter – 230kHzAF Gen. 1 – Freq. 1kHz
Ext. TX Key – OFFAF Gen. 1 – 50mV
AF Anl in – FM DemodPower Meter Avg. = 10
Wintesla Setup
Set phone to Local mode. Go to Tunings Menu enter TX Power.
Expected results with the above settings:
TX Power ≅ 26 to 27.3dBm
Expected results with the above settings:
Assembled Sinad between14 to 50dBNominal ≅ 19 to 30dB
In test fixture Sinad between14 to 50dBNominal ≅ 19 to 30dB
Connect Xear & Xmic to 8920.
Ensure phone audio level is set correctly. (4 on an 8920)
Select 'Any carrier' in phone settings.
On 8920 select TESTS, PARAMETRIC.
Select RUN TEST
X360 right hand mic
Pin?
Check R913 & D400.
Check R405 &C406
OK?
OK?
Check for shorts/damaged PCB tracks.
Replace component & retest.
Replace R409 & retest.
register?
NO
level?
NO
response?
NO
YES
YES
YES
and control channel on 8920.
correct?
YES
Consider faulty D400
Goto Txfault1.
Goto BB6 and BB7.
NO
to match phone and
re-run test.
Issue 2 03/00Page8
SAT/DSAT?
NO
TX/RX?
NO
compressor /
expander?
NO
Return to front page checks.
YES
YES
YES
Check headset socket and circuitry.
Replace D400 and re-run test.
Goto BB6 and BB7.
Page 9
PAMSNHA-9
1A
*Duplex
Sens.
pwr level 2 to7?
Repeat
Retest
Remove RF screen lids
OK?
Check AF @ R63
Go to earphone
ExamineN5, R51
, C105,
Increase RX signal
Open phone
,
Check LNA Boost
Inspect R59, D400
Check LO @ J12
>-14dBm?
C61 to
Check 2
nd
IF @ C75 ref.
Check p. 5 N5
Check N4, C72, Z22,
OK?
Check 14.85 ref.
Check G1 14.84MHz
Check 2
nd
LO@
-48dBm OK?
Check mixer output
Check RX freq.
Check LO
Check R44,
R55 & Z18
Check 2nd IF 450KHz
Check L6, C84 & N5 solder
joints replace if necessary
N5 solder joints replace if
No
Yes
See Readout
See Readout Page 13
See Readout
Check LNA output @
Yes
Check V10
,R47,R48,R49,R50
Replace V10 if necessary
See Readout
See Readout
See Readout
*Refer to software
* Note Due to possible differences in equipment all RF levels should be referenced to a known good product*
Technical DocumentationTroubleshooting
RX Fault 1
* Measure taken with a 10:1 probe*
Receiver Fault
& equipment setup.
Test AnalyzerSetup
RX & Wintesla
Setup RX.
* Simplex
Sens. RX Only
Ref. Rx fig.1&
No
Yes*yes sensitivity fail
Ref. RX Fig.
1&1A Sinad=14to
50 dBm across
Yes Yes
for High
& Low
Bands
Yes
Yes
Possible
False failure
No
No
Yes
No
inspect Ant. block
& duplexer for
replacement or
damage. OK?
A1, A5 & A6. Inspect
for dry solder joints,
missing, misplaced or
damaged components.
only Yes No
NoYes
800mVdc OK?
No
R59/ D400 p.83 ≅
&D401 for dry solder or
lifted pins. OK?
YesNo
YesYes
>300mV pk-pk ref.
RX fig 3
No
C99, C87, C93 & L5 for dry
solder joints, missing,
misplaced or damaged
components. OK?
level fault.
Replace D400
Page 13
See Readout Page 13
> -30dBm Ref RXfig 14
amplitude to –50dBm.Check
1st IF @ J10 ref.RX fig 2
45 MHz > -50dBm?
No
@ C90 45Mhz >
-48dBm?
ref.RX fig. 9
869.04 to 893.97MHz
@C90 >-89dBm?
ref.RXfig.10
Yes
914 to 939MHz
@C90 -60dBm?
ref.RXfig.11
914 to 939MHz
ref.RXfig4
No
Is R42 2.8Vdc?
No
See Readout Page 13
Check R44R55 &Z18
See Readout Page 13
Yes
Yes
Check C865, C82, C83, V9, L7, C96 &
Grnd ˜
1.1KO?
R52,R53,R59. C85 and C86
No
C80 ref RX fig 6 > - 60
dBm
See Readout Page 13
No
Check Z17 solder joints, V9, C83, L7, C96, & V11
Go to RX Fault 2
No No Yes
C81 44.55MHz
ref.RXfig.13
Yes No
@R46 >-30dBm
ref.RXfig.12 OK?
Yes
necessary
Page 14
Page 14
Issue 1 03/99Page 9
C76 >-60dBm
Ref RX fig 16
Yes
Check VRX
Page 14
G2 possibly short check C64
RX fig. 5 =450KHz
>350 mv pk-pk?
Z11, C73 & C76.
If Amps R68 & R68
Yes
See Readout Page 13
Replace if necessary
Page 10
PAMSNHA-9
Transmitter Fault 1
No TX Power
TX (no or low) output
Set
pwr level 2
Measure RF level @ C23 N1's
not probe N1 pins 12&13
*
Open
phone inspect ant.
block
and solder joints for
damage.
Measure RF level @ ant.
Inspect C11, C23, C20, R3, R12, R5, R65,
Remove RF screens A1, A5
Check L2, C33, C39, C45 & R19
Check frequencies & levels @ J5
ref.
TXfig. 3
Rx Fault 2
Check J3
ref.
TXfig. 4
- 26dBm
Measure N2 p. 5
Measure gain across
Check V4p.2
>
2vd.c. If
Measure PAEN @ C9
Measure RF level
Measure RF level @
ref. TX fig.9
Check V5, C16 &
Check N1
Check DC level
Check N1
Return to & check J3 decision if coming
Check all components in the
See Readout Page 14
See Readout Page 14
* Note Due to possible differences in equipment all RF levels should be referenced to a known good product*
Technical DocumentationTroubleshooting
TX Fault 1
* Measure taken with a 10:1 probe*
Put Phone into Local mode & enter the TX Power screen under
the Tunings menu
See Readout
Page 14
See Readout Page 14
high current
>650mA?
Yes
No Yes Yes NoYesYes
duplexer for damage If OK remove RF
screen A2 & inspect all components
& A3 inspect all competent
& solderjoints.
824 MHz to 849 MHz
>
No
>2.5vd.c.?
Yes Yes
No
Pwr Frequency &
Current OK?
pac to 800
Decimal output
pwr increases?
ref.TX fig.s 5&6
Yes
90MHz >-40 dBm?
ref. TX fig2
@ J12 914 to 939 MHz > -17dBm?
No
output ref TX fig.6 > 9dBm? *DO
Yes No No
No
Yes Yes
Yes
N1 >15
NoNo
V1 & V2. Replace Duplexer if necessary.
See Readout Page 14
90 & 900 MHz signal paths.
Replace N2 if necessary.
probe ref TX fig.10
>10dBm?
See Readout Page 14
Retest
Possible
false
Failure
p. 5 >-17dBM
ref.TX fig. 5
p. 8>2vdc?
@ p. 5 V4 >1.6vdc
No
Check R991
& D400 pin 1
See Readout Page 14
Check N1 solder joints
replace if necessary.
no check V1, R18, R3,
R7 & R 27
Yes
900 MHz OK?
No
90 MHz OK?
No
No
TX Fault 2
Issue 1 03/99Page 10
>2.5vd.c.< 3vd.c.
YesYes Yes
NoNoNo
Check C9 if ok Check
D400 & D401 solder
@ C16 > -15dBm
ref. TX fig 8
C17 OK?
Z7 output -20dBm
Check saw filter
replace if necessary
joints
Yes
from measuring N1's gain ref.TX fig.4 > 30dBm. If OK trace signal to V5.
See Readout Page 14
Check N1 Solder
Joints replace if
necessary
Page 11
PAMSNHA-9
Receiver fault 2
Check N3
Transmitter Fault 2
Measure the voltage @ N3
Check VTX @ C871
Check N3 VDD1
Measure
Is LO present @
Check loop filter C30
320kHz 3Vpk-pk @ C108
Inspect the following pins on N3 & D400 for dry solder and
Check 14.85Ref.
ref.RXfig.15
Check RF level
8
No
Set Phone to local mode enter the TX
Check loop
Yes
No
Technical DocumentationTroubleshooting
RX / Tx Faults 2
Pin 18 ≅
5.2 Vd.c.
OK?
Yes
Check N3 Cntl Lines
&VDD2 ≅
2.7vd.c.
Yes
R16 = 5.6k Ω
OK?
No
No
No
* Note Due to possible differences in equipment all RF levels should be referenced to a known good product*
* Measure taken with a 10:1 probe*