Nokia NHM-7 series Guide

PAMS Technical Documentation
NHM–7 Series Transceivers
Issue 1 10/2001 Nokia Corporation
Troubleshooting
Instructions

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 2 Issue 1 10/2001
Nokia Corporation
CONTENTS
Transceiver Troubleshooting 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Troubleshooting 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB Test Points 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Points 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting steps 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main troubleshooting tree 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is dead 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming doesn’t work 8. . . . . . . . . . . . . . . . . . . . .
Phone is jammed 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging fault 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SIM card is out of order (insert SIM card) 13. . . . . . . . . . . . . .
Audio fault 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display fault 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keypad fault 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Troubleshooting 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Key Components 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB Test Points 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter troubleshooting diagram 28. . . . . . . . . . . . . . . . . .
Transmitter signals 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizer 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizer troubleshooting diagram 35. . . . . . . . . . . . . . . . .
Synthesizer signals 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FM Radio troubleshooting 38. . . . . . . . . . . . . . . . . . . . . . . . . . .
FM Radio troubleshooting diagram 39. . . . . . . . . . . . . . . . . . .
FM Radio signals 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 3
Issue 1 10/2001 Nokia Corporation
Transceiver Troubleshooting
Baseband Troubleshooting
PCB Test Points
PURX
UEMINT
DBUSDA
DBUSCLK
FBUSRX
MBUSTX
FBUSTX
MBUSRX
CBUSDA
SLEEPCLK
CBUSCLK
DBUSENX1
CBUSENX
SLEEPX
EXTRDX
FMCLK
FMCTRLDA
FMTUNEX
FMCTRLCLK
FMWREN
FBUSRX
FBUSTX
MBUS VPP
GND
FM RADIO FPS–8
BLACK colored test points are connected to the lines between UEM and
UPP where the logic level is 1.8 V.
RED colored test points are connected to the lines from FPS–8 and have
2.7 V logic level.
BLUE test points are connected to FM radio lines and have 1.8 V logic
level.

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 4 Issue 1 10/2001
Nokia Corporation
Measurement Points
VANA 2.78 V VFLASH1 2.78 V
VCORE 1.8VVIO 1.8V
VFLASH2 2.78 V
VR1A 4.75 V
VR1B 4.75 V
VR2 2.78 V
VR3 2.78 V
VR4 2.78 V
VR5 2.78 V
VR6 2.78 V
VR7 2.78 V
XRES
XCS
GND
SDA
SCLK
VDDI 1.8 V
VDD 2.78 V
VOUT
Troubleshooting steps
The following hints help to find the problem if the circuitry seems to be
faulty. The instructions are divided into following sections:
1. Phone is totally dead
2. Flash programming doesn’t work
3. Power doesn‘t stay on or the phone is jammed
4. Charging fault
5. Plug in SIM card is out of order (insert SIM card).
6. Audio fault
7. Display is not working
8. Keypad fault
The first thing to do is carry out a through visual check of the module. En-
sure in particular that:
a) there are not any mechanical damages
b) soldered joints are OK

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 5
Issue 1 10/2001 Nokia Corporation
Main troubleshooting tree
TOP
Phone totally
dead Phone is dead
Yes
Phone doesn’t
start up or the phone is
jammed Phone is
jammed
Yes
Flash programming
doesn’t work Flash
faults
Yes
No
No
Charging
doesn’t work
No
Charger
Yes
TOP 2
No

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 6 Issue 1 10/2001
Nokia Corporation
TOP 2
Phone doesn’t read
SIM card SIM card
Yes
Audio faults
No
Audio
faults
Yes
Display or LED’s
doesn’t work
No
Display
faults
Yes
Keypad
doesn’t work
No
Keypad
faults
Yes
END
No

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 7
Issue 1 10/2001 Nokia Corporation
Phone is dead
Phone current
is zero ?
Phone current is < 50mA
No
Is phone
flash programing OK ?
Yes
Phone current is ~ 54 mA
No
Is phone in LOCAL
MODE ?
Yes
OK retest
Yes
Check BSI line
X101, C241, R203, C109,
R202
Are they OK ?
No
No
Check X101
solder and
VBATT lines
Yes
Change UEM
Yes
Repair
No
Phone is
jammed
Yes
Flash
faults
No
Phone is
dead

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 8 Issue 1 10/2001
Nokia Corporation
Flash programming doesn’t work
Flash
faults
The Phone does
not set Flashbus TXD line
high after the startup.
Measure BSI pulse
during Flash
programming.
Is it OK ?
Yes Check BSI line
X101, C241,
R203, C109,
R202
No
Measure FBUSTX
line during Flash
programming
from testpoint J411
Is it High (1.8V) ?
Yes
Check R102
If OK –>
Change UEM
No
Change UPP
Yes
The Phone does not set
Flashbus TXD line low after
the line has been high.
No
Yes Change UPP
Flash faults
page 2
No

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 9
Issue 1 10/2001 Nokia Corporation
Wrong manufactor ID
and Device ID
Flash faults
page 2
Change
FLASH
Yes
Is the phone totally dead ?
No
Phone is
dead
Yes
Phone
doesn’t start up
or the phone
is jammed ?
No
Phone is
jammed
Yes
Retest
No

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 10 Issue 1 10/2001
Nokia Corporation
Phone is jammed
Measure
32.6kHz Sleep Clk
from testpoint J404
Is it OK ?
Measure
32.6kHz Sleep Clk
from B200.
Is it OK ?
No
Measure
13MHz RFClk from R420.
Is it OK ?
Yes
Measure PURX
signal from testpoint J402
Is it high (1.8V)?
Yes
Measure
VIO, VCORE, FLASH1,
VANA, VR3 voltages.
Are they OK ?
Check VBATT1–6
VIO, VCORE,
FLASH1, VANA,
VR3 lines. Are
they OK?
No
Yes
Check BSI /
BTEMP lines. If
OK –>
UEM regulators
are not working
Change UEM
Measure 26MHz RFClk
from C660.
Is it OK ?
No Check R661,
C661, R660,
C660 if OK
change G660
No
Check R420,
C420 if OK
change N600
Yes
Change UEM
No
Yes
Check
Z260 – Z265
C260 – C265
BSI / BTEMP
lines and
VBATT lines
No
Check B200,
C209, C210
No
Change UEM
Yes
Jammed
Page 2
Yes
Phone is
jammed

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 11
Issue 1 10/2001 Nokia Corporation
Change UPP
Phone shutdown after
30s
Jammed
Page 2
Measure watchdog
signal CBUSDA from
testpoint J414
Is it OK ?
Yes No
Measure DBUSClk
1MHz signal
from testpoint J413
Is it OK ?
No
No
Read phone info.
Is it OK ?
Yes
Measure FBUSRX
signal during phone info read
from testpoint J412
Is it OK ?
Change UEM
Measure FBUSTX
signal during phone info read
from testpoint J411
Is it OK ?
Yes
Change UPP
Change UEM
Yes
Change LA5
module Retest
Yes
No No
No

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 12 Issue 1 10/2001
Nokia Corporation
Charging fault
Charger
Battery bar
doesn‘t work (scroll)
Connect
(ACP–7)
charger
Retest
No
Measure voltage
over (TVS) V100.
Is it > 3.0 Vdc ?
Yes
Check X100,
V100, C103,
C100, F100,
L100
and line
No
Read BTEMP value.
(Compare it to ambient
temperature)
Is it ~ 25 C (0319) ?
Yes
Check
X101,C109
R202, C240,
R203 and line.
Remove (fuse) F100
and measure current.
Is it ~350...390 mA ?
Yes
Change UEM
No
Retest
Yes
No

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 13
Issue 1 10/2001 Nokia Corporation
SIM card is out of order (insert SIM card)
SIM card
Insert SIM card
faults Set phone LOCAL mode
Is it OK ?
Yes
Check BSI line
X101, C241,
R203, C109,
R202.
If OK –>
Change UEM
No
Measure VSIM voltge
from X386
Is it 3V ?
Check VSIM line,X386,
C203, C389.
If OK –> Change R388.
If still wrong VSIM
voltage –> Change UEM
No
Check SIM
power UP sequency
(Page 35 figure 19)
Is it OK ?
Yes
Check SIM lines.
If OK –> Change R388.
If still fail –> Change UEM
No
Change UPP
Yes
END
No
Check X386
Yes

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 14 Issue 1 10/2001
Nokia Corporation
Audio fault
Audio
faults
Is earpiece working? Try change earpiece.
Is it working now ?
No Retest
Yes
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set EXT IN, HP OUT, LOOP ON.
No
Measure DC
offset voltage
from Earpiece pads.
Is it ~1.38V ?
Check L151, C160,
R164 and line.
If OK
–> Change UEM
No
Audio
faults 2
Yes
Measure MICB2
voltage from XMICP pads
(L106) .
Is it ~2.2V ?
Yes
Check L106, C112,
R161, C163, R166,
C165, R167 and
line.
If OK
–> Change UEM
No
Earpiece
2
Yes

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 15
Issue 1 10/2001 Nokia Corporation
Connect EXT audio signal 1kHz
(sine) (¨200mVp–p) in XMICP pads
and Ground in XMICN
Measure sine signal
from earpiece pads.
Is it ~880mVp–p ?
Earpiece
2
Measure sine signal
from UEM (R156)
Is it ~130mVp–p ?
No
Retest
Yes
Change UEM.
Yes
Check R156, C153,
C155, R166, R167,
C163, R161 and
line.
No

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 16 Issue 1 10/2001
Nokia Corporation
Audio
faults 2
Is microphone working? Try change bottom
connector X100.
Is it working now ? Retest
No Yes
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set HP IN, EXT OUT, LOOP ON.
No
Measure MICB1
voltage from MICP pads.
Is it ~2.1V ?
Check L105,
C105, C152,
C156, R152,
C168, C166,
C215 and line.
If OK –>
Change UEM
No
Check C151,
R157, C105,
C154 and line.
If OK –>
Change UEM
Yes
Audio
faults 3
Yes

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 17
Issue 1 10/2001 Nokia Corporation
Audio
faults 3
Is BUZZER working? Measure VBATT
voltage from B301.
Is it OK?
No Check VBATT
line
No
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set Buzzer volume ON.
Yes
Measure Buzzer
control signal
from BUZZER (C307).
Is it 1kHz pulses ?
Change
BUZZER
(B301)
Yes
Check C306,
C307, C308
and line.
IF OK –>
Change UEM
No
END
Yes

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 18 Issue 1 10/2001
Nokia Corporation
Display fault
Display
faults
Set phone into local mode.
Start Display test with Phenix
Are the UI–module
led’s turned on ?
Try change UI module
Is it working now ?
No
Retest
Yes
Measure signal
from X303 pin. 2.
Is it 128 Hz
~3.3Vp–p ? Check X303
Yes
Check R306 If OK.
Measure VBATT
from V300 pin. 4
Is it OK?
No
Check R304
and VBATT
line
No
Measure
PWM LED‘s
control signal from UEM
Is it 128 Hz
~3.8Vp–p ?
Yes Check control
signal line if OK
Change UEM
No Check R305,
V300, V329
and line
Yes
Display
faults 2
Yes
Check X303
No

NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 19
Issue 1 10/2001 Nokia Corporation
Display
faults 2
Are the display
led’s turned on ?
Measure signal
fromV301 pin. 3.
Is it 128 Hz
~3.3Vp–p ?
Check LED‘s
and line
Measure VBATT
from V301 pin. 4
It is OK?
Check R307
and VBATT
line
Measure
PWM LED‘s
control signal from UEM
Is it 128 Hz
~3.8Vp–p ?
Check control
signal line.
If OK,
Change UEM
Check R305,
V301, V329
and line
No
Yes
No
No
Yes
No
Yes
Display
faults 3
Yes

NHM–7
Troubleshooting Instructions PAMS Technical Documentation
Page 20 Issue 1 10/2001
Nokia Corporation
Display
faults 3
Does the display start ?
Try change UI module
Is it working now ?
No
Retest
Yes
Measure
VDD (2.78V) and
VDDI (1.8V).
Is it OK?
Check C303
and lines.
If OK,
Change UEM
No
Measure
VOUT voltage.
Is it ~8.1V?
Yes
Check C302,
X300 and lines.
No
Measure
XRES, XCS.
Is it ~1.8 V?
Yes
Check X300
and lines.
If OK, change
UPP
No
END
Yes
Yes Check X300
No