SH888, S868, Standare Electrical Repair
4/00021-2/FEA 209 544/3.D
37
(66)
9 Illumination and buzzer.
9.1 Type of fault.
Insert a dummy battery and a SIM card into the phone, start it up and wait for the
phone to get serv (with the GSM test instrument or the GSM net). If the phone
doesn’t make a beep when started, go to “menu/Ring Vol” and raise the volume to
the max. If it already is at the max, lower the volume and raise it again to the max.
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If the buzzer sounds faintly or not at all, proceed to section 9.2.
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If the background illumination for the keys and/or the display isn’t lit at start,
proceed to section 9.3.
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If the top indicator doesn’t blink green when the phone has gotten serv, proceed
to section 9.4
When the phone has gotten serv and the top indicator blinks green, lower the battery
voltage to 4.2V. The top indicator should then blink red, the battery indicator in the
display should be empty and the phone should warn with a beep.
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If the battery indicator isn’t empty, the top indicator doesn’t blink red and the
phone doesn’t warn with a beep, the phone needs a battery calibration.
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If the battery indicator is empty and the phone warns with a beep but the top
indicator doesn’t blink red, proceed to section 9.5.
9.2 Buzzer faint or silent.
Open the phone and check for liquid damages. If the buzzer is faint, check the
buzzer gasket at the top of the front. If it’s squeezed, mounted wrong, covering part
of or entire opening, replace the front and try again. Check for bad solderings at the
buzzer, H600 (class A, fig. 9.1). If the solderings are correct, replace the buzzer.
Assemble the phone and try the buzzer again as in 9.1. If the fault is fixed, send the
phone through the ordinary flow.
If the fault remains, disassemble the phone. Give the board power and start it up.
Measure the voltage at H600 pad 3 (4.8V). If the voltage is faulty or missing, meas-
ure the voltage at both sides of R606 (4.8V, fig. 9.1).
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If the voltage is missing at one side, measure the resistance of R606 (10 ohms,
class A).
* If it’s correct, replace C619 and C620 (both of them class A and in fig. 9.1).
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If the voltage is missing at both sides of R606, 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 from VBATT to R606 (the side
of it that is closest to the edge of the board, ~0 ohms).
* If it’s too high there’s a foil damage and the phone is to be discarded.
Check the soldering at D600 pin 91 (fig. 9.2).