Ericsson R250s Pro Guía

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D Approved according to 1776-2/FEA 209 544

Standard Trouble Shooting Instructions

Applicable for R250s PRO

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 2(35)

Contents

1 Explanations........................................................................................................................3

2 Network problems...............................................................................................................6

3 On/Off problems.................................................................................................................9

4 Audio problems.................................................................................................................13

5 Display/ Illumination problems.......................................................................................18

6 Capacity/ Charging problems..........................................................................................22

7 Sim Problems.....................................................................................................................24

8 Key problems.....................................................................................................................27

9 Alert problems...................................................................................................................32

10 Data communication problems........................................................................................33

11 Other problems.................................................................................................................34

12 Revision History................................................................................................................35

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 3(35)

1 Explanations

1.1 Component placement reference

For component placement see doc.1078-2/FEA 209 544/18

1.2 Pin placement

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 4(35)

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 5(35)

1.3 Abbreviations

B: Crystal.

C: Capacitor.

D: Digital circuit.

F: Over voltage protection.

H: Buzzer, LED, pads for display.

J: Connector.

L: Coil.

N: Analogue circuit, power amplifier at some phones.

R: Resistor.

S: Keyboard pads.

V: Transistor, diode.

X: Contact surface at the circuit board.

Z: Filter.

DCIO: DC voltage through the system connector for charging.

GND: Ground.

LED: Light emitting diode e.g. the background illumination.

LO: Local oscillator.

RTC: Real Time Clock, the clock that keeps track of time.

SIMCONCLK: Signal from the processor used for communication to SIM, clock signal.

SIMCONDAT: Signal from the processor used for communication to SIM, data signal.

SIMCONRST: Signal from the processor used for communication to SIM, reset signal.

SIMVCC: Feed voltage for SIM.

VBATT: Battery voltage.

VDIG: DC voltage for the processor and memory.

VDSP: DC voltage for the DSP (Digital Signal Processor).

VLCD: DC voltage for the display that controls the contrast.

VRAD: DC voltage for the radio part except the synthesizer.

VVCO: DC voltage for the synthesizer.

I2C: Two line serial communications standard using one clock and one data

line.

PWM: Pulse Width Modulation

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 6(35)

2 Network problems

2.1 Find out if the fault is RX or TX related

Connect the phone, with the signalling program, to a GSM test instrument and try to get serv at -

68,5 dbm signal strength.

If the phone gets serv, go to the section 2.1.2.

If the phone does not get serv, the fault probably is dependent on the LO part,

or the losses in the signal path are too great, go to section 2.1.1.

2.1.1 The phone does not get SERV

Disassemble the phone and check for liquid damage.

No further action should be taken for a liquid damaged telephone.

Check visually the antenna connector X101, checks if it is damaged, bad soldered or dirty.

If necessary, replace X101.

Check for bad soldering at C314, C318, C319, N301, N302 and N303.

Measure the resistance and replace the faulty component of C530, C531, C532, C533, C534 and

C535, all >200 kohms.

Measure the resistance and replace the faulty component of

C850>100 kohms, C851>1kohm, C833>1kohm, C853>100kohms.

Check for bad soldering at Z250, Z500, Z201 GSM900, Z202 GSM1800 and Z205.

Give the board power and start it up.

• Measure VRAD (3,8V) at C433.

If the voltage is incorrect, go to the section On/ Off problems.

• Measure the DC voltage at N303 pin4 and pin6.

Pin 4 = variable control voltage between 0,8-2,8V (usually 1,7V at the start).

Pin 6 = variable feed voltage (3,3V usually at the start of the board).

If N303 pin 6, the feed voltage is too low or missing.

Check the soldering at D105, D103 and D600 pin8 and pin102.

Measure VVCO 3,8VDC at N410 pin5.

If not, replace N410.

If yes 3,8V at N410 pin 5, measure the level 3,8V at V305 pin 2.

If yes 3,8V at pin 2, replace V305 and C321.

If no 3,8V at pin 2, replace R301.

If N303 pin4, the control voltage is too high (3,6V).

Replace N301.

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 7(35)

If pin4, the control voltage is too low or missing.

Measure the resistance of R312~22 kohms.

If R312 is ok, measure the control- voltage 1,7V at N301 pin5, at the start of

the board.

If the control voltage is too low or missing, replace N301 and C317.

If the control voltage is ok at N301pin5 and too low at N303 pin4,

replace C319 and C314.

If the fault still remains, send the unit on according to the local company directives.

2.1.2 The phone gets serv

Set the GSM test instrument at power level 5 and the signal strength -68,5dBm,

for GSM900.

To try GSM1800, set the power level 0 and the signal strength of -68,5dBm

Set up a call to a GSM test instrument.

If it works.

Go to the section 2.1.3,read the RX level from the GSM instrument while the call is connected.

If it does not work.

Probably the fault is located at the TX.

If calls cannot be connected at the lower channels only, then the fault is N570,

and the phone can not be repaired at this level, send the unit on according to the local company

directives.

Disassemble the phone and check for liquid damage.

No further action should be taken for a liquid damaged telephone.

Check visually the antenna connector X101, if it is damaged, bad soldered or dirty.

If necessary, replace X101.

Measure the resistance from the P401 test point, to ground >10 kohms.

If the resistance is too low, usually 200 ohms, then N401 is damaged, and the phone can not be

repaired at this level, send the unit on according to the local company directives.

Check that L403 not is burned.

Check the soldering at Z205, Z203, GSM900 and Z204 GSM1800.

Check the soldering at N560 and N570.

Measure the resistance at C853 >100 kohms, L560 and L223~0 ohm.

If the fault still remains send the unit on according to the local company directives.

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 8(35)

2.1.3 Read the RX level value from the GSM instrument while the call

is connected

If the RX-level is at 40-46 steps, make sure the output power is 31-35 dBm for GSM 900(power

level 5) or 28-32dBm for GSM1800 (power level 0).

If it is correct, lower the signal strength to -102dBm for GSM 900 and make sure the RX-level

is 6-12 steps and that the RX-quality value is at 0-2steps.

For GSM 1800 the signal strength should be -100,5dBm,the RX-level value 7-13 steps and the

RX-quality value 0-2 steps

Make a call to the public net and check the audio part.

If it is ok, the phone has passed the test.

If the phone can not connect a call to the public net:

Check if the phone is locked out of the system due to theft.

If it not is locked out, replace D600.

• If the phone can’t connect a call at any of the lower channels (GSM900) but at other higher

channels, or if it can not switch from another high channel to channel 1 (or several lower

channels) it means that N570 is faulty and the phone can not be repaired at this level, send

the unit on according to the local company directives.

Disassemble the phone and check for liquid damage.

No further action should be taken for a liquid damaged telephone.

Make sure the antenna connector X101 is not damaged, badly soldered or dirty.

If the RX-level value is below 40 steps at -68.5dBm signal strength there is an RX-related fault.

Measure the resistance of C530-C535 >200 kohms.

Check the soldering at Z250, Z500, Z201 GSM900, Z202 GSM1800 and Z205.

If the fault remains send the unit on according to the local company directives.

If the RX level value is above 45 steps at input signal -68,5 dBm or the RX quality is high, the

phone needs to be calibrated. Send the unit on according to the local company directives.

If the output power is too low, check the soldering at N560, N570, Z205, Z203 and Z204.

If the fault remains, send the unit on according to the local company directives.

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 9(35)

3 On/Off problems

3.1 Starting the phone pressing the On/Off key

1. Remove the battery and make a visual check of the battery connectors,

make sure they are intact.

2. Insert a dummy battery into the phone, start it up by pressing the On/Off key and check the

current consumption.

3. If the phone starts, check the charging function by connecting a charger at the system

connector. If it does not charge go to chapter Charging problems.

4. If the phone does not consume any current when the On/Off key is pressed, go to 3.2.

5. If the phone consumes 1-200 mA, starts (and request for SIM, seeks net, etc....) and works

as long as you keep the On/Off key pressed, go to 3.3.

6. If the phone starts but consumes more than 200mA go to 3.4.

7. If the phone does not start try to reprogram it in the flash programmer.

8. If the phone does not start in the flash programmer go to 3.5.

9. If the phone is programmable but not start afterwards go to 3.6.

3.2 The phone does not consume any current when the

On/Off key is pressed

Disassemble the phone and check for liquid damage.

No further action should be taken for a liquid damaged telephone.

Make sure the battery screws are correctly tightened.

Make sure the system connector pads-J602, not are damaged or burned.

Remove the domefoil, according to mechanical Instructions, and make sure that the keypads are

not broken, liquid damaged or dirty especially the On/Off key.

No further action should be taken for a liquid damaged telephone.

Give the board power.

• Make sure there is VBATT voltage at the pad of the On/Off keypads.

If VBATT is missing there is a foil damage, send the unit on according to the local

company directives.

If VBATT is correct, measure the resistance from the other pad, ONSRQ, to V702 pin

1~0ohms.

If the resistance is incorrect there is a foil damage, send the unit on according

to the local company directives.

If the resistance is correct, replace V702.

If the fault remains, send the unit on according to the local company directives.

Standard Trouble Shooting Instructions

4/00021-2/FEA 209 544/18 D 10(35)

3.3 The phone runs as long as the On/Off key is pressed

Disassemble the phone and check for liquid damage.

No further action should be taken for a liquid damaged telephone.

Make sure the system connector pads-J602 not are damaged or burned.

Mount the board in the fixture. Start it up and keep it running by keeping DCIO high.

• Measure the voltage at C692 >3V.

If it is correct, check the soldering at D600 pin 119, measure the resistance of C692

>200 kohms

If the resistance is incorrect replace the capacitor.

If the resistance is correct, measure the input voltage at N706 pin 2 (VBATT),

and the output voltage at pin 3 ~3.5V. Make sure that there is ground at N706

pin 1.

If VBATT or ground is missing there is a foil damage, send the unit on

according to the local company directives.

If VBATT and ground are correct but not the output voltage, replace

N706.

If they are all correct, measure the voltage at the positive side of the

backup capacitor, C720 ~3.2V.

If it is incorrect, measure the resistance of R720 ~180 kohms,

and R719 ~47kohms.

If they are correct, replace V711.

If the voltage is correct, measure the resistance from the

positive side of C720 to C692 ~0 ohms.

If it is incorrect then there is a foil damage, send the unit on

according to the local company directives.

3.4 The phone consumes more than 200 mA

Disassemble the phone and check for liquid damage.

No further action should be taken for a liquid damaged telephone.

Make sure the system connector pads not are damaged or burned.

Mount the board in the fixture. Start it up and keep it running by keeping DCIO high.

• Check the current consumption again.

If it is more than 200mA, replace the display and the elastomer and try again.

• Check the resistance from VBATT to ground >1 Mohms.

If it is less, send the unit on according to the local company directives

• Check VDIG on N702 pin5 and VDSP-N701 pin5 voltage ~3.2V.

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