GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 29 (112)
4.7 Both the microphone and the speaker of
the handsfree out of order but the ear-
phone and the microphone of the phone is
working.
Open the phone and check for liquid damages, especially within the marked area
above the system connector pads in fig. 4.5.
Clean the marked area using alcohol and a brush.
Measure the resistance from X602 pad 3 to the unmarked side of R635 (~0 ohms,
fig. 4.4 and 4.5).
Measure the resistance from X602 pad 5 to the unmarked side of R636 (~0 ohms,
fig. 4.4 and 4.5).
• If any of the resistances are too high there’s a foil damage and the phone is to be
discarded.
Measure the resistances of R601 and R605 (both are 1 kohms, of class A and in fig.
4.4).
If all the resistances are correct, check the solderings of N800 and D600 (fig. 4.3
and 4.2).
If the fault remains, send the phone to the next level.
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