If the fault remains, send the phone to the next repair level.

5 (42)

Fig. 2.1
2.3 The phone only gets serv at GSM 900.
Open the phone and check for liquid damages. Check the soldering at N330 (class B), N332 (class B) and N202:40,41 (class C)(all in g.2.1). Replace N330.
2.4 The phone only gets serv at GSM 1800
Open the phone and check for liquid damages.
Measure the resistance of N203:5 (class B, g 2.1) to ground. The resistance should be high (>1 Mohm). If it is considerably low (a few ohm), is the fault probably due to Z200 (class B). Check the soldering at N331 (class B), N333 (class B) and N202:43,44 (class C)(all in g.2.1). Replace N331. If the fault remains, send the phone to the next repair level.

6 (42)

The phone gets serv, but cant connect a call.
Check the soldering at the components around N202 (class C) and N550 (class C)(both at g. 2.1).

7 (42)

3 Doesnt start.

3.1 Type of fault.

Attach a dummy battery. If the phone starts automatically, proceed to section 3.2. Press the On/Off button. If: The phone starts (lights up the illumination, asks for SIM or PIN or searching for a network), check the charging function by connecting a charger to the system connector. * If the charging doesnt work, proceed to chapter 6 (Charging-fault). * If the charging works, the phone probably is okay (the fault can be due to problem with the battery). The phone only works as long as the On/Off button is being pressed, proceed to section 3.3. The phone doesnt start, proceed to section 3.1.1 The fault is intermittent, proceed to section 3.4

3.1.1 Doesnt start.

Make an outer visual check and make sure the battery screws (g 3.1) are okay and properly mounted.

Fig. 3.1

Keep the On/Off button pressed. Check the current consumption. If: The phone doesnt consume any current at all, proceed to section 3.5. The phone consumes between 1-200 mA, proceed to section 3.6. The phone consumes more then 200 mA, proceed to section 3.7.

8 (42)

Start immediately when the battery is attached.
Open the phone and check for liquid damages. Make sure there is no dirt making a short circuit at the On/Off pads (No key, g 3.2). Clean if necessary, use alcohol and a brush.

Fig. 3.2

If the fault still remains, send the phone to the next repair level.
The phone works as long as the On/Off button is being pressed.
Check the soldering at D600:116 (g. 3.3). Diode measure V702:2-3 (g. 3.3). Replace if it is faulty.
Measure the resistance between D600:116 V702:2 to verify an eventual foil damage, in that case the board has to be discarded.

Replace D600.

9 (42)

Fig. 3.3

3.4 The fault is intermittent.
Make an outer visual check and make sure the battery screws (g 3.1) are okay and properly mounted. Open the phone and check for liquid damages, also make sure the connection pads for the battery screws are clean. Check the soldering at D600 and D610 (g. 3.3). If the soldering is correct and the fault remains, send the phone to the next repair level.
The phone doesnt consume any current at all.
Open the phone and make a visual check of the board. Check for liquid damages on both sides of the board, dirty or oxidised pads at the system connector and the battery connections, and if there are any obviously damaged components.

10 (42)

Give the board power and make sure VBATT exists at the marked side of the On/Off button (g. 3.5). If VBATT doesnt exist, is there a foil damage and the board has to be discarded.

Fig. 3.5

Make sure R703 (4.7 kOhm) and R704 (0 Ohm, both g. 3.3) is correctly mounted and has got the correct resistance.
Give the board power again. Keep the On/Off button pressed and measure the voltage at V702:3 (~3.5 V when VBATT=5.0 V) Incorrect: Replace V702. Correct: Replace V703 and V704.
Note! The components V703,V704, R703 and R704 are only mounted at the board version 3920/2.
The current consumption is between 1-200 mA.
Try to program the phone again. Make sure the system connector is okay.
Open the phone and check for liquid damages and other damages. Check the soldering at D600 and D610 (g. 3.3).
Measure the voltage at N701:5 (~3.2 V) and N700:5 (~2.5 V) (g. 3.3). Incorrect: Replace the faulty component. If the fault remains, send the phone to the next repair level.

11 (42)

Measure the voltage at the marked side of C710 (~3.1 V). Incorrect: Correct: Replace C710 Replace D610. Try to program the phone again

Replace D600

3.7 The current consumption is >200 mA.

Open the phone and check for liquid damages and other damages.
If one or more class A/B component is mechanically damaged or burned, replace it/ them.
Otherwise, send the phone to the next repair level.

12 (42)

4 Audiofel

4.1 Type of fault.

Make a call from the phone that is to be tested (later called the phone) to a phone that is working correctly (later called the reference phone). Check the function of the microphone and the earphone. Connect a handsfree unit to the system connector of the phone. Check the function of the phones external connections by listening to the external speaker/earphone when talking in the reference phone and by listening to the earphone of the reference phone when talking in the external microphone of the phone. If there is low or no sound in the earphone of the phone, proceed to section 4.2. If both the earphone and the handsfree speaker dont work, send the phone to the next level. If the sensitivity of the microphone is low (low or no sound in the reference phone), proceed to section 4.3. If both the microphone in the phone and the microphone of the handsfree dont work, send the phone to the next level. If both the microphone and the earphone dont work, proceed to section 4.4. If the microphone, the earphone and the handsfree dont work, send the phone to the next level. If the microphone of the handsfree doesnt work, proceed to section 4.5. If the speaker of the handsfree doesnt work, proceed to section 4.6. If both the microphone and the speaker of the handsfree dont work, proceed to section 4.7. If the phone sounds strange (the sound is distorted, scrambled, full of static or chopped), send the phone to the next level. If the phone isnt able to mute a car stereo through a car mounted handsfree (the mute signal doesnt work), proceed to section 4.8.
4.2 Earphone out of order.
Open the phone and check for liquid damages. Most of the earphone faults are mechanical. Therefore you should start with replacing the front (with the earphone) to one you know works and try again.
If the fault remains, make sure the earphone connector (J810, g. 4.1) is intact and correctly soldered. Check the soldering at N800 (g. 4.2). Measure the resistance between the pins of J810 (>1 MOhm). If it is too low, replace C842 (class A, g. 4.1)

13 (42)

Measure the resistance of C840 or C841 (>1 MOhm, class A, g. 4.1) to check if there is a short circuit in any of them.

Fig. 4.1

14 (42)

Fig. 4.2

4.3 The microphone is out of order.
Open the phone and check for liquid damages. Clean the pads to the microphone if necessary. Replace the microphone with one you know is working. Assemble the phone and try again.
Measure the resistance of R817, R819 (both 1 kOhm, class A) and R818 (22 kOhm, class A, all g. 4.2). Check the soldering at N800:14,15,16 (class C, g. 4.2).
If the fault remains, replace C818 and C819 (class A, g. 4.2). Measure the resistance between the pads of X830 (~48 kOhm, g. 4.1). If it is incorrect, replace C815 and C814 (both class A, g. 4.2). Measure the resistance between P800 (g. 4.1) and ground (~47 kOhm). If the resistance is incorrect, measure the resistance of R812 (1.5 kOhm) and R814 (470 Ohm, both class A, g. 4.2).

15 (42)

If both resistances are correct, measure the resistance between P800 (g. 4.1) and N800:14 (g. 4.2) (~2 kOhm). If it is too large, is there a foil damage and the board has to be discarded.
Measure the resistance between P801 (g. 4.1) and ground (1.5 kOhm). If the resistance is too low, replace C820 (class A, g. 4.2). If the resistance is too large, replace R820 (1.5 kOhm, class A, g. 4.2).
Both the earphone and the microphone are out of order.
Check the soldering at N800 (Note! Class C) and D600 (g. 4.2)
Give the board power and start it using the On/Off button. Measure the voltage VDIG at N701:5 (~3.2 V, g. 4.2). Incorrect: Proceed to chapter 3 (Doesnt start-fault).
Measure the voltage (~3.2 V) at both sides of R601 (g. 4.1) and at D600:70 (g. 4.2). Measure the voltage (~3.2 V) at both sides of R605 (g. 4.1) and at D600:67. If the voltage at R601 or R605 (both class A) is too low at only one side, replace the resistor. * If that doesnt make it, replace D600. If the voltage is too low at both sides of R601 or R605, measure the voltage at R635 and R636 (~3.2 V, class A, g. 4.1). * If a resistor is incorrect, replace it. If VDIG (~3.2 V) is missing at R635 and R636, but exists at N701:5, the board has got a foil damage and has to be discarded.

16 (42)

4.5 The handsfree microphone is out of order.
Open the phone and check for liquid damages, especially around the pads of the system connector, J602:1,2,4 (g. 4.3).
Fig. 4.3 Measure the resistance between J602:2 and ground, it should be larger then 30 kOhm. If the resistance is too low (ATMS has a short circuit), try to replace C651 (class A, g 4.1).
Check the soldering at N800 (Note! Class C, g. 4.2).
Check the resistance at: R825 (3,3 kOhm) R814 (470 Ohm) C814 (>20 kOhm) C810 (>50 kOhm) C812 (>1 MOhm) R802 (3.9 kOhm) R805 (15 kOhm) R803 (1 kOhm)
If any component is faulty, replace it (all class A, g. 4.4).

17 (42)

Fig. 4.4
4.6 The handsfree speaker is out of order.
Measure the resistance between the system connector J602:1 and ground (~100 kohm), if it is too low, replace F601 (g. 4.1), C650 and C668 (g. 4.2) (all class A, g. 4.1).
Check the soldering at N800 (g. 4.2).
Check the resistance of : R806 (100 Ohm) R804 (100 kOhm) C813 (>1 MOhm)
If any component is faulty, replace it (all class A, g. 4.2).

18 (42)

Both the handsfree microphone and the handsfree speaker is out of order.
Make sure the system connector is okay and not dirty.
Open the phone and check for liquid damages, especially around the pads of the system connector. If necessary, use alcohol and a brush to clean.
Measure the resistance between J602:3 (g. 4.3) and R635 (~0 Ohm at one side, the resistance of the resistor is 22 kOhm, g. 4.1).
Measure the resistance between J602:5 (g. 4.3) and R636 (~0 Ohm at one side, the resistance of the resistor is 22 kOhm, g. 4.1). If any of R635 or R636 is incorrect, replace them. If the resistance is too high, is there a foil damage and the board has to be discarded. Measure the resistance of R601 and R605 (both 1 kOhm, class A, g. 4.1). If all resistances are correct, check the soldering at N800 and D600:67,70 (g. 4.2).

4.8 Mute fault.

Connect a call and measure the voltage between AGND of the system connector, J602:4 (g. 4.5) and MUTE, J602:6, it should be 3.2 V during a connected call. If the voltage exists, the fault probably is in the handsfree unit. If the voltage doesnt exists, open the phone and check for liquid damages, especially around the pads of the system connector.

19 (42)

Fig. 4.5 Measure the resistance between J602:6 (g. 4.5) and ground, it should be >1 Mohm. If it is incorrect, replace C665 (class A, g. 4.1). * If the resistance still is incorrect, replace D600 (class B, g. 4.2).
Measure the resistance between J602: 6 and D600:92 (g. 4.2), it should be 470 ohm. If it is larger, replace R602 (class A, g. 4.1) and measure again. * If the resistance still is too large, is there probably a foil damage. * If the resistance is correct and the fault still remains, replace D600 (class B, g. 4.2).

20 (42)

5 Display

5.1 Type of fault.

Start the phone, with a fully charged battery attached, using the On/Off button. If: The phone doesnt start, proceed to chapter 3 (Doesnt start-fault). The display misses one or more segments, proceed to section 5.2. The display doesnt show anything at all, proceed to section 5.3. The display is black, proceed to section 5.4
5.2 Segments are missing.

Open the phone and check for liquid damages. Replace the display.
5.3 The display shows nothing at all.
Open the phone and check for liquid damages. Make sure the connection H623 is okay, isnt dirty or oxidised and the soldering is correct. If the connection is faulty, the phone should be send to the next repair level. Otherwise try replacing the display. Give the board power and start it in the xture. Make sure the voltages at the connection H623 are correct (g. 5.1).

21 (42)

Fig. 5.1
1 - VLCD (~ 6.2 V) is incorrect, diode measure V608:1-3, V611:1-3 and V611:2-3 (g. 5.2). Replace if faulty. Measure the voltage at V611:1 (~3.8 V). If the voltage is missing, make sure N580 (g. 5.2) is correctly soldered, if it is replace N580. * If the voltage is still missing, send the phone to the next repair level. Measure the resistance between VLCD and ground. If it is <100 kOhm, replace C633 (g. 5.2) and C673 (g. 5.1). Measure the voltage at D600:95 (~3.0 V) and D600:96 (~0.2 V). If any of the voltages are incorrect, measure the resistances of C634 and C636 (g. 5.2) to make sure there isnt a short circuit. Replace if faulty. If C634 and C636 are correct, replace D600. If the fault remains, send the phone to the next repair level.
2 - VDIG (~ 3.2 V) is incorrect, replace N701 (g. 5.2). If that doesnt work, send the phone to the next repair level.

22 (42)

3 - I2CDAT (~ 3.2V) is incorrect, measure the resistance of R619 (6.8 kOhm, g. 5.2). Check the soldering at D600:3. If all is correct, replace D600. 5 - I2CCLK (~3.2 V) is incorrect, measure the resistance of R620 (6.8 kOhm, g. 5.2). Check the soldering at D600:4. If all is correct, replace D600.

Fig. 5.2

5.4 The display is black.
Open the phone and check for liquid damages. Try again using a display you know is correct. If the fault remains, measure the resistance of R808 (33 kOhm, g. 5.2). If the resistance is very low, replace C824 and C826, otherwise replace R807 and R808 (all in g.5.2).

23 (42)

6 Charging

6.1 Type of fault.

To verify that it is the phone that is faulty, use a charger and a battery you know is working and try to charge the battery. Note! The phone doesnt begin to charge if the charger is connected to a phone without a SIM card inserted (the display shows Insert Card).
Perform a visual check of the battery screws and the system connector, change if necessary. Start the phone using the On/Off-button and a fully charged battery, but without the charger connected. If the phone doesnt start, proceed to chapter 3 (Doesnt start-fault). If the phone starts and shows charging, send the phone to the next repair level.

Connect a charger to the system connector. If the phone shows charging and the red top indicator is lit, the phone is without fault. If the phone doesnt show charging, proceed to section 6.2. If the phone starts and shows charging, but the battery isnt charged, proceed to section 6.3. If the phone shows charging, but the red top indicator isnt lit, proceed to chapter 9 (Illumination and buzzer-fault).
6.1.1 Verication of the charging function.
Attach a normal battery to the phone. The battery voltage must be high enough to start the phone, it will not begin to charge at once otherwise.
Cut a cable from a battery charger to make a charging test cable. Connect the test cable to a power supply that shows the current consumption. Make sure the positive side from the power supply connects to DCIO (the lonely pin at the system connector, pin 12). An alternative solution is to use a battery charger with a ammeter connected in series.
Set the power supply to 7.6 V and the current limit to 700 mA. Connect the test cable to the system connector of the phone and check the current consumption. If the phone starts and shows charging and the current consumption varies between a few mA and 700 mA (the alternative solution gives ~500-800 mA depending on what kind of charger you use) with a few seconds interval, the charging function is okay. You have to verify the charging function after every repair of any part of the charging function

24 (42)

6.2 Doesnt show charging in the display.
Open the phone and check for liquid damages. Make sure the pads of the system connector are not burned or have oxide or dirt on them. Clean them with isopropyl alcohol if necessary. If the gold plating is damaged, the board has to be discarded.
Replace V450 (class A, Fig. 6.1)

Fig. 6.1

Starts and shows charging, but the battery isnt charged.
Open the phone and check for liquid damages, especially at the system connector. Measure the resistance of R553 (0.1 Ohm, class A, Fig. 6.1). Replace if it is incorrect.

25 (42)

7 SIM fault

7.1 What is SIM fault?

Insert a working SIM card and attach a fully charged battery to the phone. If the display shows: Wrong card or Insert correct card, the phone is SIM locked and cant be repaired at this level. Phone lock, the phone is locked by the customer with a personal code. It will be unlocked in the reset program in the normal repair ow. PIN: or Enter PIN, the SIM card is locked with a personal code. Insert card, (and only Insert card !!) is it a SIM fault.

7.2 Insert card is shown in the display.
Remove the SIM card. Make sure the connection plates of the SIM connection, J603 (Fig. 7.1), are not mechanically damaged or dirty and also make sure the soldering is correct.

Fig. 7.1

26 (42)
Give the board power and start it. Measure VVIC at D901:1 (3.2 V, Fig. 7.1). If the voltage is missing: * Replace C910 and R920 (class A). If the voltage exists: * Measure the voltage at D901:2 (3.2 V). * If the voltage exists: 1. Measure the resistance between D901:8 and J603:2 (~33 Ohm). Incorrect: 1. Replace R600 (class A). 2. Foil damage, the board has to be discarded. 2. Measure the resistance between D901:11 and J603:7 (~33 Ohm). Incorrect: 1. Replace R628 (class A). 2. Foil damage, the board has to be discarded. 3. Measure the resistance between D901:9 and J603:3 (~ 33 Ohm). Incorrect: 1. Replace R627 (class A). 2. Foil damage, the board has to be discarded. 4. Measure the resistance between D901:11 and D901:14 (~ 15 kOhm). Incorrect: 1. Replace R626 (class A). 2. Foil damage, the board has to be discarded. 5. Measure the resistance of C909 (> 1 MOhm). Incorrect: 1. Replace C909 (class A). 6. Measure the resistance between D901:14 and ground (> 1 MOhm). Incorrect: 1. Replace C908 (class A). 7. Measure the resistance between D901:14 and J603:1 (~ 0 Ohm). Incorrect: Foil damage, the board has to be discarded. 8. Replace D901 (class A). 9. Replace R634 (class A). 10. Replace D600 (class B). * If the voltage is missing at D901:2 (3.2 V): * Measure the resistance between D901:2 and D600:77 (~0 Ohm) Correct: Replace D600 (class B).
Incorrect: Foil damage, the board has to be discarded.

27 (42)

8 Keyboard
8.1 Type of keyboard fault.
Insert a SIM card and attach a fully charged battery. Start the phone using the On/ Off-button. If the phone doesnt start at all, proceed to chapter 3 (Doesnt startfault).
Press all keys and verify which one that doesnt start. The easiest way to do the verication is as follow: Go to Menu/Settings/Key sound and choose Click. Press the keys "1", "2", "3".."*"," 0" ," #". You should hear a click sound and see the responding gure in the display when pressing each key. Then press "Yes", "No", "Clr", "<" and" >". When pressing "Yes" the phone tries to connect a call, press "No" and the phone should stop connecting a call. Press "<" or " >" and you scroll the menus and "Clr" clears the display from the gures that came up.
Open the phone and check for liquid damages, especially around the faulty keys. Clean the keyboard pads thoroughly and assemble the phone with a new keyboard. Check if the keys are working according to the test above.

If a complete row or a complete column (according to g. 8.1) is faulty, proceed to section 8.2. If only some keys are faulty, proceed to section 8.3.

28 (42)

Fig. 8.1
8.2 A complete row or column is faulty.
Check the corresponding soldering at D600 (Fig. 8.1 and 8.2) for the faulty row/column.

29 (42)

Fig. 8.2 If the soldering is correct, measure the resistance from one of the faulty pads (row/ column see Fig. 8.3) to the corresponding pin of D600 (Fig. 8.2). Should be ~0 Ohm, otherwise is there a foil damage.

Fig. 8.3

30 (42)
If the resistance is correct, replace D600
Some keys (not a complete row/column) are faulty.
Make sure the soldering at D600:1,120-128 are correct. If the soldering is correct there is a foil damage and the board has to be discarded. To verify it, measure the resistance between the faulty pad and a working pad in the same row/column (should be ~0 Ohm). The foil damage is usually caused bye a liquid damage. For example: The keys 5 & 6 doesnt work. Measure the resistance between the row-side of key pad 4 and the row-side of the key pad 5 to verify a foil damage (should be ~0 Ohm).

Fig. 8.4

31 (42)
9 Illumination and buzzer

9.1 Type of fault.

Insert a SIM card and attach a dummy battery to the phone. Start the phone by pressing the On/Off -button and wait for the phone to get serv (against an instrument or a real network). If the phone doesnt beep directly at start, go to Menu/Ring Vol and try to raise the volume (not from full to step as that doesnt generate any sound). If the buzzer sounds faint or not at all, proceed to section 9.2. If the background illumination for the display doesnt light up at start, proceed to section 9.3. If the keyboard illumination doesnt light up at start, proceed to section 9.4. If the top indicator doesnt ash green when the phone has got serv, proceed to section 9.5. When the phone has got serv and ashes green, lower the battery voltage to 4.2 V. The top indicator should then start to ash red, the battery indicator in the display should show an empty battery and the phone should warn with a beep. If the battery indicator doesnt show an empty battery and the phone doesnt either beep or ashes red, the phone needs a battery calibration. If the battery indicator shows an empty battery and beeps, but the top indicator doesnt ash red, proceed to section 9.6.

9.2 The buzzer is faint or dead.
Make sure H600, V605, V606, R606, R651 or D600:91 is correctly soldered.

Fig. 9.1

32 (42)
If all soldering is correct, replace the buzzer (H600). Try the buzzer again by starting the board in the xture, the buzzer should sound because there is no SIM card inserted. If the fault remains, make sure R606 is ok by measure the voltage at both sides of it (VBATT). VBATT should also exist at H600:3. If it doesnt, is there a foil damage. If the voltage is correct, replace V606 and R651.
* If that doesnt x it, measure the resistance from R651 (marked side) to D600:91. It should be ~0 Ohm, otherwise is there a foil damage and the board has to be discarded

Replace D600.

If the fault still remains, send the board to the next repair level.
The background illumination to the display is missing or faintly glowing.
Open the phone and check for liquid damages. Make sure all LEDs (H651, H652, H653 and H654. All four class A, Fig. 9.2) are mounted and correctly soldered.
Fig. 9.2 Give the board power and start the board. If only a couple of the LEDs are faulty, replace them. If none of the LEDs are lit, measure the resistance at one of them. * If the resistance is ~0 Ohm, is there a foil damage in at least one of the LEDs. Remove the LEDs one by one in the following order: H654; H651, H653 and nally H652. Measure the resistance after each removal. When the resistance increases, the fault is xed.

33 (42)

* If the resistance of the LEDs are too high, make sure VBATT exist on the them. If VBATT is missing, the phone is probably liquid damaged. If VBATT is correct, make sure R607 (~1.0 Kohm, class A) and R609 (~2.7 Ohm, class A) are mounted and correctly soldered.

Fig. 9.3

If none of the LEDs H651-H660 are lit, measure the voltage at marked side of R607 (~0.55 V, Fig. 9.3). Before measuring you have to press one of the keys to let the processor set LED3K high for approximately 10 seconds. * If the voltage is missing, check the soldering at D600:69 (Fig. 9.4).

34 (42)

Fig. 9.4 * If the soldering is correct, replace D600 (class B).
The keyboard illumination is missing or faintly glowing.

Open the phone and check for liquid damages. Make sure all LEDs (H655-H660, all class A, Fig. 9.5) are mounted and correctly soldered.

35 (42)

Fig. 9.5 Give the board power and start the board. If only a couple of the LEDs are faulty, replace them. If none of the LEDs are lit, make sure VBATT exists at them. If VBATT is missing, the phone probably is liquid damaged. If VBATT is correct, make sure R607 (~1.0 kOhm, class A) and R610 (~4.7 Ohm, class A) (both Fig. 9.6) is mounted and has got correct resistance.
Fig. 9.6 If none of the LEDs H651-H660 are lit, measure the voltage at the marked side of R607 (~0.55 V, Fig. 9.6). Before measuring you have to press one of the keys to let the processor set LED3K high for approximately 10 seconds. * If the voltage are missing, check the soldering at D600:69 (Fig. 9.4). * If the soldering is correct, replace D600 (class B).

36 (42)

9.5 Green top indicator doesnt work.
Open the phone and check for liquid damages. If the red top indicator doesnt work either (to check it see section 1), measure the resistance of R646 (~470 Ohm) and check the soldering of it (R646).
Fig. 9.7 Make sure the double LED H650 (class A, Fig. 9.7) or D600:94 (Fig. 9.8) is correctly soldered.

Fig. 9.8

37 (42)
If the soldering is correct, replace H650. * If that doesnt x it, measure the resistance between H650:3 (g. 9.7) and D600:94 (g 9.8) (~0 Ohm) * If the resistance is ~0 Ohm, replace D600 * If the resistance is larger, is there a foil damage.
9.6 Red top indicator doesnt work.
Open the phone and check for liquid damages. If the green top indicator (should ash green when the phone has got serv) doesnt work either, make sure the soldering is correct and measure the resistance of R646 (~470 Ohm, Fig. 9.7). Make sure the double LED H650 (class A, Fig. 9.7) or D600:93 (Fig. 9.9) are correctly soldered.

Fig. 9.9

If the soldering is correct, replace H650.

38 (42)

* If that doesnt x it, measure the resistance between H650:1 and D600:93 (~0 Ohm). * If the resistance is ~0 Ohm, replace D600. * If the resistance is larger, is there a foil damage.

39 (42)

10 RTC

10.1 Find the fault.

Start the phone with a SIM card inserted and a fully battery attached. Set the clock at the right time. Remove the battery and reattach it after one minute. If the clock in the phone shows 00:00, proceed to section 10.2. Compare to a clock with the correct time. If the clock in the phone is speeding or halted, proceed to section 10.3. The component side of the board is shown in gure 10.1.

Fig. 10.1

10.2 The clock shows 00:00 after removing and reattaching the battery.
Open the phone and make sure the backup capacitor C720 (class A, Fig. 10.2) is correctly soldered.

Fig. 10.2

40 (42)
If it is, replace it. Assemble the phone, start it and set the correct time again. Wait a few minutes to allow the backup capacitor to begin charging. Remove the battery and reattach it after one minute. Make sure the fault is xed. (The backup capacitor needs to be charged for a few hours before it is fully charged.) Compare to a clock with a correct time. If the clock still is speeding or halted, proceed to section 10.3.
10.3 The clock is speeding or halted.
Open the phone and make sure the crystal B600 is correctly soldered. If it is, replace B600 (class A), C690 (class A) and C691 (class A, all components in Fig. 10.3). Assemble the phone and compare to a clock with the correct time.

Fig. 10.3

41 (42)

11 Component lists

Component lists in document 131 22-2/FEA 209 544/16

42 (42)