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PF768, Standard Electrical Repairs
Make sure the buzzer (H600, class A, fig. 8.2) is correctly soldered.
• If the solderings are correct, replace the buzzer.
Assemble the phone and try the buzzer as in 8.1 again.
• If the fault is repaired, send the phone through the normal flow.
• If the fault remains, open the phone. Give the board power and start it up.
Measure the voltage at H600 pad 4 (~3.4V, fig. 8.2).
Fig. 8.2
• If the voltage at H600 pad 4 is missing, measure the VRPAD voltage (~3.8V) at
V706 pin 1 (class A, fig. 8.2).
* If the voltage at V706 pin 1 is missing, check if there's VRPAD voltage at
N452 pin 5 (fig. 8.3).
4/00021-2/FEA 209 544/11.C
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