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PF768, Standard Electrical Repairs
• If there's correct voltage at R825, check the resistance of C810 (>10 kohms),
C812 (>100 kohms), R802 (~3.9 kohms) and R805 (~15 kohms, all of class A
and in fig. 4.3).
If the fault remains, send the phone to the next level.
4.6 Handsfree speaker out of order.
The fault occurs when there's an interrupt in the audio path from the N800 to the
handsfree speaker (connected through the system connector). The audio path is
shown in fig. 4.8.
Fig. 4.8
Open the phone and check for liquid damages, especially around the system connec-
tor pads (X602, fig. 4.6) 1, 2 and 4.
Measure the resistance of C850 and C851 (both >100 kohms, both of class A and in
fig. 4.3).
Make sure all the components in fig. 4.8 (R803, R804 and C813) are mounted at the
circuit board (fig. 4.4).
Check the solderings of N800 (fig. 4.3).
Measure the resistances of R803 (~100 ohms), R804 (~100 kohms) and C813 (>100
kohms, all of class A and in fig. 4.4).
Measure the resistance from the marked side of R803 to pad 1 of X602 (~0 ohms,
fig. 4.4 and 4.6).
• If the resistance is too high there's a foil damage and the phone is to be dis-
carded.
If the fault remains, send the phone to the next level.
4/00021-2/FEA 209 544/11.C
27
(68)
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