Illumination And Buzzer - Ericsson I 888 Trouble-Shooting Instruction

9 Illumination and buzzer.

9.1 Type of fault.
Attach a dummy battery and a sim-card to the phone, press the On/Off-button and
wait until the phone has got serv. (Against an instrument or a real network).
• If the phone doesn´t make a beep when started, go to Meny/Ring level and raise
• If the illumination and/or the display light isn´t lit up when started, proceed to
• If the top indicator doesn´t flash with green light when the phone has got serv,
• When the phone has got serv and flashes with green light, lower the battery volt-
9.2 The buzzer is faint or dead.
Open the phone and check for liquid damages. If the buzzer is faint, then check the
buzzer gasket in the front cover. If it is squeezed, partly or completly covers the hole
in the front cover, then change the front cover and try again. If that didn´t help, then
check the buzzer, H600 (class A, Fig 9.1) for bad solderings. If the solderings are
fine, replace the buzzer. Put the phone together and check the buzzer again accord-
ing to section 9.1. If the fault is gone, send the phone trough the regular flow.
If the fault remains, dismount the phone and give the board power. Measure the volt-
age on H600:3 (4.8V). If the voltage is missing or incorrect, check the voltage on
both sides of R606 (Fig 9.1). Ii it is missing on one side measure the resistance of
R606 (10 Ohm, class A, Fig 9.1), if the resistance is correct, then replace C619 and
C620 (class A, Fig 9.1). If the voltage is incorrect on both sides, measure VBATT
(4.8V, Fig 9.1). If VBATT is incorrect, proceed to chapter 3 ("Doesn´t start"-fault).
If VBATT is correct, measure the resistance to R606 (the side nearest the edge of
the board), if there is an interruption (larger than approximately 0 Ohm), the phone
has to be discarded. Check the soldering at D600:91 (Fig 9.2), if it is fine then meas-
ure the resistance between the same pin and V606:1 (Fig 9.1), the resistance should
be 1.0 kOhm.
the volume to max. Try again, if it still doesn´t make a beep or if it makes a low
beep, proceed to section 9.2.
section 9.3.
proceed to section 9.4.
age to 4.2V. The top indicator should start to flash with red light after a while, the
battery indicator show an empty battery and warn with a beep.
* If the battery indicator doesn´t show an empty battery and the phone
doesn´t make a beep or flash with red light you will have to perform a battery
calibration.
* If the phone does show an empty battery and makes a beep but doesn´t flash
with red light, proceed to sedtion 9.5.
4-00021-2/FEA 209 544/5.C
I888, Standard Electrical Repairs
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