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Chapter5
TROUBLE SHOOTING
Test flowchart of test SIM card
Replace SIM
card
Base band or MT6235
may have fault.
Could not read
SIM card of master
Clean or replace SIM
socket.
Check if points of
SIM card are OK
NO
NO
NO
NO
YES
YES
YES
YES
OK
End
If SIM card is
invalidation?
Connect to steady-voltage
power supply to see if
current is OK?
Power may be damaged. Test if
voltage of pin 4/5 of J700 at exactly
power on is 3V. If pin 1/2/3 has
switch of pulse voltage.
Replace U101
NO
Summary of Contents for EM941
Page 6: ...6 Paste the film on lens and LCD Take PCBA out of A cover Take off the main key...
Page 8: ...8 FINISH Lock the screws Assemble battery cover...
Page 9: ...9 Chapter 2 SYSTEM BLOCK DIAGRAM...
Page 10: ...10 Chapter4 ACTUALL BOARD PCBA layout drawing A side J701 LCD connector...
Page 11: ...11 Electronic schemes Main CPU...
Page 12: ...12 Keypad input...
Page 13: ...13 Oclock Electronic schemes Cable and flash connect sheet Oclock out put...
Page 14: ...14 BT control SIM card data out put 7 2 MT6235 CPU power output...
Page 16: ...16 BT MODEL...
Page 17: ...17 Audio PA U201 I O connector 5PIN...
Page 18: ...18 PA IC RF AD6548 RF7166...
Page 19: ...19 FM SIM card SIM 1 SIM 1power supplier SIM 1 data SIM 2 power supplier SIM 2...
Page 20: ...20 8 0 WIFI 2 Control loop...
Page 39: ...39 Figure 18 Figure 19...
Page 40: ...40 Figure 20...