Nokia 2180 Service Manual faultps
Programme’s After Market Services
NHD–4 Series Transceivers
Disassembly &
Troubleshooting
Original 11/97
NHD–4
PAMS
Disassembly & Troubleshooting
Technical Documentation
CONTENTS
Disassembly Instructions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Troubleshooting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Diagram; Flash Programming OK, part 1 10. . . . . . . . . .
Troubleshooting Diagram; Flash Programming OK, part 2 11. . . . . . . . . .
Troubleshooting Diagram; Flash Programming OK, part 3 12. . . . . . . . . .
Troubleshooting Diagram; Flash Programming OK, part 4 13. . . . . . . . . .
Troubleshooting Diagram; PWR Button Fault 14. . . . . . . . . . . . . . . . . . . . .
Troubleshooting Diagram; Audio Fault 15. . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Up Sequence Diagram 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repairing Instructions for Flash Faulty Units 17. . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Diagram; Power Up and MCU Self tests Malfunctions 18
Power Up Malfunction 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Diagram; Power Up Malfunction 24. . . . . . . . . . . . . . . . . .
Important Information 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Troubleshooting 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Software Quick Checks 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Output Power Control 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detector DC Voltage Check – AMPS 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Node Voltage Checks 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Node Power Levels 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Gains and Losses 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing CDMA TX Gain Limiting 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Dynamic TXB 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing CDAGCT IC (N100) Gain Control 32. . . . . . . . . . . . . . . . . . . . . . . . .
Testing Auxiliary AGC 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Spurious Emissions of the CDMA TX Output 33. . . . . . . . . . . .
Hints and Suggestions 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS Receiver Troubleshooting 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
Introduction 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tests and Quick Checks 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Up the AMPS Receiver Test 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RSSI Check 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Voltage Checks 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chart of AMPS RX DC Node Voltages 38. . . . . . . . . . . . . . . . . . . . . . . . . . .
Demodulation Test 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Original 11/97
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NHD–4
Technical Documentation
RF Node Power Checks – AMPS Mode 38. . . . . . . . . . . . . . . . . . . . . . . . . .
CDMA Receiver Troubleshooting 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CDMA RX Quick Test with Service Software 40. . . . . . . . . . . . . . . . . . . . . .
Set Up CDMA RX Test 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RX Gain Control Test 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Voltage Checks 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chart of CDMA RX DC Node Voltages 43. . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Demodulation Check 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Node Powers – CDMA RX Mode 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hints and Suggestions 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizer Troubleshooting 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Check with Service Software – Transmitter Approach 46. . . . . . . .
DC Voltage Checks – AMPS Troubleshooting Mode 47. . . . . . . . . . . . . . .
Disassembly & Troubleshooting
Chart of Synth DC Node Voltages – AMPS Troubleshooting Mode 49. . .
RF Node Power Levels 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hints and Suggestions 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Original 11/97
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Disassembly & Troubleshooting
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Technical Documentation
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Original 11/97
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NHD–4
Technical Documentation
Disassembly Instructions
Remove the battery.
Disassembly & Troubleshooting
Now remove two back
cover screws and re-
move the back cover
by lifting it away.
2
1
4
3
6
Then remove six
chassis screws.
Original 11/97
5
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NHD–4
PAMS
Disassembly & Troubleshooting
Technical Documentation
Remove the chassis by lifting.
Turn around the chassis and open
the display module a little.
Open the display module connector
by pressing both sides of connector
and slide off the display module
cable.
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Original 11/97
PAMS
NHD–4
Technical Documentation
Turn chassis again and remove
four chassis screws.
Disassembly & Troubleshooting
1
4
3
2
Remove the plastic shield and
throw it away (it is disposable).
Now you can separate the system module from the bottom
shield by lifting it away.
Original 11/97
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NHD–4
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Disassembly & Troubleshooting
Baseband Troubleshooting
Overview
Baseband oriented failures are usually found out during Flash updating of
the phone, the phone should be started to minimum mode and current
consumption measured. If current consumption is within acceptable limits
and MBUS registration is OK, flash is programmed. If flash programming
fails, service software can be used to activate MCU self tests. During the
MCU self tests all the major components of the baseband are tested.
Every test returns number of the test and result ( OK / failed ).
If phone can be flashed and all self tests performed, the baseband is
mainly OK.
In case of current consumption/MBUS registration failure, the phone must
be taken to more specific measurements of voltages, clocking signals and
states of reset signals.
Technical Documentation
The flow diagrams give the overview of the blocks. The purpose is to
proceed through the flow diagram so that, if answer is YES for the asked
question, go straight to the next level, but if answer is NO, take the
sub–branch.
Required servicing equipment:
Service software
Power supply (1.0 A)
Digital multimeter
Oscilloscope
Modular cable
RS232/MBUS adapter
Soldering iron and related tools.
Current consumption failures in flash station
Current consumption can fail in three ways. Typical to all these failures is
that phone can not be programmed or tested via MBUS. The most
common failure is that phone takes normal current during startup and
after a few seconds all circuits are powered down. The reason for this
could be in power, clock or reset distribution of the phone. In cases where
phone does not take current at all or phone takes all available current the
reason could be defective PSL_+3V(N500) or bad soldering (short or
open) around PSL_+3V(N500).
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Original 11/97
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NHD–4
Technical Documentation
Phone takes all available current
If phone takes all available current, the problem can be caused by bad
solder joints in PSL_+3V(N500), components around it and bottom
connector(X701).
Phone does not take current at all
If phone does not take current at all, check the following things:
– solder joints in PSL_+3V(N500)
– VBATT voltage should be available in pins 5 and 20 of PSL_+3V(N500),
if connections of PSL_+3V(N500) are OK and VBATT in pins 5 and 20 are
OK, change PSL_+3V(N500).
Current consumption OK during power–up, then fail
If the phone starts almost normally, but after few seconds all circuits are
powered down, the power–down, could be caused by lack of watchdog
signal from MCU(D706) to PSL_+3V(N500) . There are three major things
to be checked in this type of situation. First, check power distribution to all
baseband–main components. Then check that clocks are delivered to
CDRFI(N700), ASIC(D704), DSP(D705) and MCU(D706). If everything is
OK, check RESET status of circuitry mentioned above.
Disassembly & Troubleshooting
Checking the baseband power distribution
Before voltage measurements, power–down of PSL_+3V(N500) must be
prevented. This is done by shorting the watch–dog timing capacitor C507
with a wire soldered from one end of the capacitor to the other.
1.Check PSL_+3V(N500) output voltages pins 4, 21,16, 2, 24 and 1.
Expected value is around 3.15V. Also, check voltage in pin 12 (DETIN) to
be between 1.46V and 1.72V.
2.Check MCU(D706) supply voltage VL1(3.15V) on pins 5 and 42. Check
VREF (3.15V) voltage on MCU(D706) pin 60. Check voltages of
MCU(D706) related memory components: FLASH(D709) pins 30, 31 and
11; RAM(D700) pin 28; and EEPROM(D703) pin 7.
3.Check ASIC(D704) supply voltage VL1(3.15V) on pins 13, 22, 27, 44,
60, 65, 74, 88,103, 109, 117, 132, 146, 151, 161, and 176.
4.Check DSP(D705) supply voltage VL2(3.15V) on pins 8, 11, 36, 39, 49,
64, 76, 87 and 90. VL2(3.15V) is also fed to DSP RAM (D707) to pin 11
and 33.
5.Check CDRFI(N700) supply voltage VL3(3.15V) on pins 32, 33, 60, 62,
2, 6, 8 and 19.
6.Check supply voltages of audio CODEC(N600). VA2(3.15V) is fed to
pins 2 and 3. VL1(3.15V) is connected to pin 15.
Original 11/97
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Disassembly & Troubleshooting
Technical Documentation
Troubleshooting Diagram; Flash Programming, part 1
FLASH programming OK
MBUS
registration
OK?
NO
YES
Does LCD
display turns
ON?
YES
NO
Check D706 pins 3,80
ASIC pins 130,86
3
Short circuits in data
data lines. data line
disconnected, VREF
disconnected
Check that pin 4 of D500
NO
is 4.75V. Also check the
control line, it should be
high (3V on Pin 1 of
Check X701
C507 OK?
YES
Power
stays on?
NO
NO
NO
N500 pin 8/XRESET
VBATT
N500 pin 5,20
?
YES
3V after power ON?
YES
display turns
YES
MBUS line X701
pin 5, Is 4.75V after
YES
Does LCD
ON?
pwr ON?
NO
D500).
R500, R503
OK?
YES
Change N500
YES
Power supp. to the logic
circuits +3V after power
ON?
NO
Change N500
D706 pin 67
+3V after power ON?
NO
YES
2
YES
Change D706
Check V703,
R728, R726,
R727, if OK
change D706
Page 10
Original 11/97
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NHD–4
Technical Documentation
Disassembly & Troubleshooting
Troubleshooting Diagram; Flash Programming, part 2
2
NO
Check D704 and D706 for
short/open pins, if pins look
OK change D704 if problem
continues change D706
D706 pin 10
XSYS_RESET +3V after
power on?
YES
15.36MHz at
D706 pin 69
?
YES
D706 pin8/MD2
and pin9/STBY are
+3V ?
YES
NO
NO
Check clock
signal in N700
and D704
Check these
two pins for
shorts and
opens
D706 pin 43/
XPWROFF has 0V to +3V
pulses after power
ON ?
YES
D706 pin 77
/IRQ0 +3V after
power on?
YES
D706 pin 11
/NMI 0V after
power on?
YES
D706 pin 4
/XMCU_WR +3V
after pwr on?
NO
Change D706
Check D704 and
NO
D706 for shorts
and opens. If OK
change D706
Check D704 and
NO
D706 for shorts
and opens. If OK
change D706
NO
Check D706
Original 11/97
YES
Check all soldered joints
The data and address signals must have
a clear difference between low (0 V)
and high (+3V)
Page 11
NHD–4
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Disassembly & Troubleshooting
Technical Documentation
Troubleshooting Diagram; Flash Programming, part 3
3
MBUS registration OK?
YES
Does LCD display turns ON ?
YES
Check D706
and D703
interface
NO
D703 initialization
(Factory Values Set) OK?
NO
D703
pin 18,19/D0,D1
+3V to 0V during r/w
operations ?
YES
Change D703
YES
4
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Original 11/97
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NHD–4
Technical Documentation
Disassembly & Troubleshooting
Troubleshooting Diagram; Flash Programming, part 4
4
D709
/pin 23, 39 +12V while
programming?
YES
D706
/pin 64/HOOK_RXD2
pulses during prog?
YES
NO
NO
Check X701/pin14
L700,C729,R748
R741
Check X701 pin 6
R736,R739,R764
C723
X701 pin 7
/PHFS_TXD2 pulses
during programming?
YES
D709
pin 10/RP +3V after
power ON ?
YES
D709
pin 22/CE pulses
from +3V to 0V after
power ON?
YES
D709
pin 24/OE pulses
from +3V to 0V after
power ON ?
NO
NO
NO
NO
Check D706 pin 63
R725,R735,C721
Check VCO_EN line
at the D709 pin 10 for
shorts and opens
Check XFLASH_CS
line at theD704 pin 107
Check XMCU_RD line
at the D706 pin 3
Check D709 address and
data lines for shortcircuits
or unconnected pins
OK
Change D709
Original 11/97
YES
D709
pin 9/WE pulses
from +3V to 0V after
power ON ?
NO
Check XMCU_WR line
at the D706 pin 4
Page 13
NHD–4
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Disassembly & Troubleshooting
Troubleshooting Diagram; PWR Button Fault
Nothing happens when
PWR button is pressed
N500
pin 10 +3V when
VBATT is connected?
YES
NO
Technical Documentation
Check
X701
NO
N500 pins 5,20
VBATT voltage?
YES
Change
N500
Check
UI–conn. X700
Change
UI
NO
pin 10 goes low when
N500
PWR button is
pressed?
YES
R500,R503
C507 OK
Check component
around N500, if OK
change N500
Page 14
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Technical Documentation
Troubleshooting Diagram; Audio Fault
Audio fault
Microphone or earphone
signal missing
N600 pin 19/CODEC_FS from D704
Microphone and
earphone signal
missing?
NO
YES
N600 pin 20/CODEC_MCLK from D704
D705 pins 29,37/CODEC_FS from D704
D705 pins 27,33/CODEC_MCLK from D704
Disassembly & Troubleshooting
Microphone signal
missing?
NO
Earphone signal
missing?
YES
YES
N600 pin 25,24/MICP,MICN
N600 pin 17/PCMOUT
N600 pin 21/MICENX
corresponding pins of UI–connector
N600 pin 7,8/EARP,EARN
N600 pin 10/PCMIN
corresponding pins of UI–connector
Original 11/97
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NHD–4
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Disassembly & Troubleshooting
Power Up Sequence Diagram
VBAT 5.3....8V
CHRGDET
DETIN
ON
CDCONT
N201
5, 20
11
12
14
XPWROFF
C507
23
N500
9
13
VRXS 4.5V
VCO_EN
VL1 MCU_CLK (15.36MHz)
4
VL2
21
VL3
16
VA1
2
VA2
24
XRESET
82
VREF
1
VCTCXO
G300
CLK 15.36MHz
1
CDRFI N700
63
CLK 15.36MHz
128
147
104
168
ASIC MCUPSL
121
98
D704
Technical Documentation
Square circuitry
XSYS_RESET (3.15V)
MCU_INT0 (3.15V)
MCU_NMI (0V)
ON=3.15V
69
10
77
11
5,42
D706
43
66
TXD
PSL_+3V(N500)
Output voltages must stay high at least 7seconds when power is switched
on.
If no; check C507.
If it is OK; replace PSL_+3V(N500).
If the XRESET line doesn’t rise check DETIN. The voltage value at this
pin should be between 1.46V and 1.72V.
ASIC(D704)
When XRESET and CLK are supplied to the ASIC(D704) but MCUCLK or
XSYS_RESET to the MCU(D706) are not supplied; replace ASIC(D704).
MCU(D706)
If MCU_CLK and XSYS_RESET are supplied from ASIC(D704) but TXD
line (MBUS) doesn’t rise and solder joints of the MCU(D706) are good,
check that MCU_INT0 is high (3.15V) and MCU_NMI is low (0V), if that is
the case then replace MCU(D706).
XPWROFF 7s
Page 16
If TXD pin 66 of the MCU(D706) goes high but doesn’t stay there at least
7seconds.
The power of the phone can be kept ON by:
– Connecting PSL +(N500) pin 14 to the ground.
Now it is possible to use service software for troubleshooting.
Original 11/97
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NHD–4
Technical Documentation
Disassembly & Troubleshooting
Repairing Instructions for Flash Faulty Units
1. When the phone doesn’t start (power off after 7seconds and probably no MBUS
connection) check following things:
VBATT is connected to the PSL_+3V(N500)
XRESET rises to 3.15V
VL1 is 3.15V
32KHz clock is running.
VRXS(4.5V) is connected to the VCTCXO and the crystal frequency is
15.36 MHz
XSYS_RESET signal rises to 3.15V
MCU_CLK signal is 15.36 MHz
MCU_NMI line stays low(0V)
MCU_IRQ0 line stays high(3.15V)
If all these happens, the MCU(D706) will supply power OFF pulses to the
PSL_+3V(N500) and the power will stay on.
In faulty conditions, most likely MCU_IRQ0 stays low(0V), which means
that interrupt is generated all the time.
In this case check data and address lines of ASIC(D704), MCU(D706)
and memory circuits for short circuits or unconnected pins.
2. When FLASH programming is not succeed, check following things:
System connector(X701) pins 6, 7, 14 are soldered and there are no short
circuits.
Flash programming voltage (VF=12V) is connected to the FLASH(D709)
pins 23 and 39.
The data and address lines of the FLASH(D709) are soldered.
EEPROM(D703) should be OK because of the initialization (program pa-
rameters are loaded always when program is loading the first time).
Calibrate Battery Voltage (VBATDET)= 6.0V
a) Check R505, R504
b) Check PSL_+3V(N500) pin 23
c) Check MCU(D706) pin 52
Calibrate Charge Voltage (VC)= 6.0V
a) Check R502, R501, R508
b) Check MCU(D706) pin 53
Original 11/97
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