Huawei YU220 Service Manual page 52


Failure analysis process:
Fault 1: Insert the headset, silent, unable to detect headphones plugged;
Repair process: First, replace with a new headset first to see if the recovery
exclusion headphone monomer problem, if not the headphones monomer
confirm the problem, then the headset is plugged into, whether measured
EINT_HP signal is
detects R805 whether
socket is soldered, the headset is bad;
:
Fault 2 always show headset is plugged
Repair process: first rule headset monomer problem, if not the headphones own fault,
then plug in your
EINT_HP whether the signal has been low, if the test has been low, respectively,B801,
B802, short circuit (may be sequentially removed B801, B802 look headset unplugged,
EINT_HP signal is set high)
2013-10-18
YU220 service manualV1.0
pulled low, not
Weld, B804 bead
,
unplug the headset cannot be detected
headphones and then
Huawei secrets, no dispersion without permission
pulled low and
inductors are Weld, headphone
pull out after the first measurement
then sequentially
;