Nokia 2140 TROUBLESHOOTING 06

TROUBLESHOOTING

NHE–1

Contents

Troubleshooting 6–2–2 General 6–2–2 Flash Programming OK; part 1 6–2–3 Flash Programming OK; part 2 6–2–4 Flash Programming OK; part 3 6–2–5 Flash Programming OK; part 4 6–2–6 PWR Button Fault 6–2–7 Display Selftest Failed 6–2–8 No Registration to the System (no svc) 6–2–9 Audio Fault 6–2–10 Power Up Sequence 6–2–11 Repairing Instructions for Flash Faulty Units 6–2–12 RF Tuning Fails 6–2–14 Synthesizer Fails; part 1 6–2–16 Synthesizer Fails; part 2 6–2–17 RX Signal levels 6–2–18

9711OJ Technical Documentation

6–2–1

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ORIGINAL 1 1/97

TROUBLESHOOTING

NHE–1

Troubleshooting

General

The purpose is to define fault block of the module and then find out the broken component. The trouble shooting diagram has been planned so that the fault, whatever it is, can be found by as simple measurements as possible.

The flow diagrams give you the overview of the blocks. The purpose is that you proceed through the flow diagram so that, if your answer is YES for the asked question, go straight to the next level, but if your answer is NO, you have to go the subbranch.

Required servicing equipment: – PC for Service Software – Power supply (2.0 A) – Digital multimeter

9711OJ Technical Documentation

6–2–2

Copyright  Nokia Mobile Phones

– Oscilloscope – Spectrum analyzer – RF cables – Modular cable – RS232/MBUS adapter – CMT/Marconi – RF measuring chassis

ORIGINAL 1 1/97

TROUBLESHOOTING

NHE–1

9711OJ Technical Documentation

Flash Programming OK; part 1

FLASH programming OK

YES

Check X100

C113 OK?

YES

R110 OK?

YES

MBUS

registration

OK?

Power

stays on? NO

NO

VBATT

pins 5, 20?

YES

N271/pin 8/XRESET

+5 V after pwr on?

Display:

selftest failed

YES

3

Display:

selftest failed

YES

MBUS line X100/5 +5 V after pwr on?

YES

NO

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D231/MCU/pin 3

D230/ASIC/pin 97

rstrobe

Short circuits in data

data lines. data line

disconnected, VREF

unconnected

NO

R166

+ 5 V?

YES

V160 base

∼1 V

YES

Check R163,

V160, R161,

R160, C160

If D231 at

NO

pin 66/TXD

doesn’t apply

+5 V change

NO

R165, R166 V161, R164

6–2–3

D231

Check

Change N271

ORIGINAL 1 1/97

Power supp. to the logic

circuits +5 V after pwr on?

NO

Change N271

MCU/D231/PIN67/RDX

+5 V after pwr on (J109)?

NO

If R162 is OK change D231

YES

2

YES

Change first

D231

TROUBLESHOOTING

NHE–1

9711OJ Technical Documentation

Flash Programming OK; part 2

NO

RESETX +5 V after

YES

Change D230

26 MHz clock

D230/pin 119?

NO

26 MHz/1 Vpp in

testpoint J113

2

MCU/D231/pin 10

power on?

/pin 8/MD2, MCU/D230

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YES

26 MHz at MCU

/D230 pin 69

/MCUCLK?

YES

MCU/D230

/pin 9/STNDBY?

NO

Change D230

NO

6–2–4

Check joints

and foils

YES

Check components

D191, D192, R231 R246, R247, C234

YES

MCU/D231/pin 43

/XPWROFF pulses up to

+5 V after pwr on?

YES

MCU/D231/pin 77

/IRQ0 +5 V after

power on?

YES

MCU/D231/pin 4

/WSTROBEX +5 V

after pwr on?

YES

Check all soldered joints

The data and address signals must

a clear difference between low (0 V)

and high (+5 V)

NO

Change D231

Change D230

Check D230

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TROUBLESHOOTING

NHE–1

9711OJ Technical Documentation

Flash Programming OK; part 3

MBUS registration OK?

Display: selftest failed?

3

YES

EEPROM

initialization OK?

(FLASH8N.MES)

NO

6–2–5

Copyright  Nokia Mobile Phones

YES

4

Check D230

Check D231

(D230)

Check D231

(D230)

NO

D184/EEPROM

/pin 27/EROMSELX pulses

+5 to 0 V during r/w

action?

YES

D184/EEPROM

/pin 1/RSTROBEX pulses

+5 to 0 V during r/w

action?

YES

D184/EEPROM

/pin 1/WSTROBEX pulses

+5 to 0 V during r/w

action?

YES

Change D184

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TROUBLESHOOTING

NHE–1

9711OJ Technical Documentation

Flash Programming OK; part 4

/pin 11 +12 V during

/pin 64/HOOK/RXD2

pulses during prog?

/PHFS/TXD2 pulses

during programming?

4

D185/FLASH

programming?

YES

D231/MCU

YES

X100/pin 7

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NO

Check X100/pin 14 C182, R175, R169

Check X100/pin 6 R177, R178, C176

Check D231/pin63 R184, R185, C186

6–2–6

Check D185/FLASH/ ADDRESS/DATA LINES /no shortcircuits or unconnected pins allowed

OK

YES

D185/FLASH

/pin 12/PWD +5 V

after power on?

YES

D185/FLASH

/pin 9/ROMSELX pulses

from +5 to 0 V after

power on?

YES

/pin 37/RSTROBEX pulses

YES

/pin 38/WSTROBEX pulses

D185/FLASH

from +5 to 0 V after

power on?

D185/FLASH

from +5 to 0 V after

power on?

NO

Check D230

Check D231 (D230)

Change D185

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