FLY E185
Service Manual
CKT Confidential
Page 37 of 47
4.8 FM radio failure
If the FM can not work well, please check whether the power supply, clock signal, audio output
signal is working normally, then re-solder the FM chip AR1000.
4.9 Signal problem
RF failure often occurs in calibration or capability test, the best diagnostic method is to use
wireless universal tester, spectrum analyzer and signal source matched with META tool to test it.
Corresponding components with the RF receiving mainly are: Antenna switch, Saw filters,
matching circuit etc. You need to check whether one of them is bad soldering or damaged. If
power received is too low maybe the RF circuit is cut off, you need to check saw filter, matching
circuit, antenna switch, and control signal etc. If the bit error is too high, it maybe because of the
saw filter is not qualified.
RF transmitting circuit associated components is mainly as below: Baseband MT6236, RF
transceiver (GSM AD6548), Attenuator, RF PA & Antenna switch, etc. Main test items including
power value, power vs. time, modulation and switch spectrum etc. The current consumption when
transmitting RF signal is about 200mA. So if the current is too low, it means the PA doesn’t work
properly, you need to change it for a new one.
Chapter 5: Update Manual and FAQ
5.1 Preparations before Update
Item
Description
Remarks
MTK_AllInOne_DA.bin Download Agent file
ScatVIVI.txt Scatter-downloading
file
Upgrade file list
VIVI-S0A_1V8_CKT_
L2EN_103_110309
Mobile Terminal bin file
