Alert Problems - Ericsson R250s PRO Troubleshooting Instructions

9 Alert problems

9.1 Type of fault
Insert a dummy battery and a SIM card into the phone, start it up.
Go to the "menu /Ring Vol." and activate the vibrator and rise the volume to max. Switch off
the phone and restart it. At the start, the phone will activate the buzzer, vibrator and the
illumination.
1. Wait for the phone to get serv (with the GSM test instrument or the public net).
2. If it does not make a beep or it makes a low beep go to 9.2
3. If the vibrator does not activates go to 9.3.
9.2 Buzzer problems
Disassemble the phone and check for liquid damage.
No further action should be taken for a liquid damaged telephone.
Place the board in the fixture, mount a new buzzer to the board give power and start it up.
•
If the buzzer does not gives a beep measure 4,8 V at C619.
Restart it and check if the buzzer gives a beep.
•
If it does not make a beep measure the resistance and check the soldering of J600, R661,
R606 and R651.
•
If the fault remains measure with the oscilloscope at V606 pin 1, give the board power and
start it up.
At the start (10 pulses) with an amplitude of 3.2 V will appear in the oscilloscope.
9.3 Vibrator problems
Disassemble the phone and check for liquid damage.
No further action should be taken for a liquid damaged telephone.
Place the board in the fixture. Mount a new vibrator to the board give power and start it up.
•
If the vibrator does not operate, measure the resistance and check the soldering of J601,
F603, R624, R621, R618, R613, R611 and R617.
4/00021-2/FEA 209 544/18 D
If the DC level is low replace C619 and V606.
Replace the faulty component, and start it up again.
If no pulses appear, measure the resistance between D600 pin91 and V606 pin 1.
If it is correct (470 ohms) replace C653 and D600.
If the resistance is extremely high between D600 pin91and V606 pin1, send
the unit on according to the local company directives.
Replace the faulty component.
Standard Trouble Shooting Instructions
32(35)