PF768, Standard Electrical Repairs
4/00021-2/FEA 209 544/11.C
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8 Illumination and buzzer.
8.1 Type of fault.
Insert a dummy battery and a SIM card into the phone, press the On/Off key and
wait for the phone to get serv (towards the net or a GSM test instrument).
•
If the phone doesn’t beep at start, go to “menu/ring level” and try to increase the
ring level to full (not from full to step since that won’t generate any sound). If the
sound is faint or if you can’t hear it at all, proceed to section 8.2
•
If one or more of the LEDs at the display illumination isn’t lit at start, proceed to
section 8.3.
•
If one or more of the LEDs at the keyboard illumination isn’t lit at start, proceed
to section 8.3.
•
If the top indicator doesn’t blink green when the phone has got serv, proceed to
section 8.4.
•
If the top indicator blinks green when the phone has got serv, lower the battery
voltage to 4.2V. The top indicator should then start to blink red, the battery indi-
cator should show an empty battery and the phone should warn with a beep.
* If the battery indicator doesn’t show an empty battery, the top indicator
doesn’t blink red and the phone doesn’t warn with a beep the phone needs a
voltage calibration.
* If the top indicator doesn’t blink red but the other things work, proceed to
section 8.6.
* If both the top indicators colours are faintly glowing and the buzzer sounds
faintly, proceed to section 8.7.
8.2 Buzzer faint or dead.
Open the phone and check for liquid damages.
The front side of the circuit board is shown in fig. 8.1.
Fig. 8.1