CSL EM941 Service Manual Download Page 24 | Manualshive

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CSL EM941 Service Manual Download Page 24

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The test flowchart of headphone

Replace
headphone

When having a call, use a

oscillograph to test if there is

audio signal from UB205/B206

No sound in

headphone

Check if C201 has
sundries or
damaged

If there is sound

when switch to

loudspeaker?

NO

NO

NO

NO

YES

YES

YES

YES

Repulse C201 or
clean it

If headphone is
connect OK or not

Remove headphone and test it by
multimeter’s beep function. If there is
sound like ‘sasa’ from headphone?

Replace headphone

Replace MT6235

NO

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Summary of Contents for EM941

Page 1: ...DGE only downloading WAP MMS GPRS Class 12 player MP3 player music library SRS Voice Recorder FM Radio Micro USB 2 0 JAVA Main WIFI Blue tooth MSN Yahoo messenger Youtube Google talk Facebook Twitter...

Page 2: ...rostatic discharge can easily damage the sensitive components of electronic products Therefore every service supplier must observe the precautions which mentioned above GENERAL REPAIR INFORMATION 1 Ma...

Page 3: ...3 DISASSEMBLY AND ASSEMBLY SERVICE TOOLS Voltage regulator Multimeter Iron 850 heater Constant temperature heater Oscillograph...

Page 4: ...oves Wrist grounding strap Antistatic gloves Software download cable Microscope Solder wire soldering paste Metal tweezers Screw driver SRT 6 Plates Metal tweezers SRT 6 Screw driver MTK series CPU pl...

Page 5: ...5 DISASSEMBLY Pull out battery cover Take out the screws Take off the back cover Separate the FPC connector Take off the screw Prize up the middle housing...

Page 6: ...6 Paste the film on lens and LCD Take PCBA out of A cover Take off the main key...

Page 7: ...7 ASSEMBLY Put the PCBA into A cover Close the FPC connector Put the cover on the PCBA Install the screw Close back cover and front cover together Install power on 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 15: ...e current Vcore 1 2v 200ma Vio 2 8v 100ma Vadd 2 8v 150ma Vtcxo 2 8v 20ma Vrtc 1 2v 200ma Vmem 2 8v 150ma Vsim 2 8v 20ma Vcs 2 8v 200ma vcs 1 8v 150ma CPU voitage and current sheet CPU SIM SIM 7 3 bat...

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 21: ...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 P...

Page 22: ...d of slave Clean or replace SIM socket If points of SIM are OK 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 Test if voltag...

Page 23: ...be MT6235 is fault Could not power on Re solder or replace J402 of battery Check battery point of J402 is OK NO NO NO NO YES YES YES OK End Connect to power supply if it can be power on If current is...

Page 24: ...B206 No sound in headphone Check if C201 has sundries or damaged If there is sound when switch to loudspeaker NO NO NO NO YES YES YES YES Repulse C201 or clean it If headphone is connect OK or not Re...

Page 25: ...h when bell works No sound of bell Remove headphone and test it by multimeter s beep function If there is sound like sasa from headphone NO NO NO YES YES YES YES Replace bell components If it is libra...

Page 26: ...start signal from pin 13 of J601 and if 8 bit address bus is normal or not No display or display abnormal when power on Replace LCD NO NO NO OK YES YES If display interface connects OK Replace LCD FPC...

Page 27: ...obile such as configuration of software cable power PC etc Whether mobile is power on NO NO NO NO YES YES YES YES YES OK Replace or re configure Check whether J302 connector is false solder or damaged...

Page 28: ...receiver will have a sound 3 Key press relevant keys appear in the screen 5 Libration The cellphone will librate 6 Lond SPK there will be a sound from the speaker 7 Ring press start there will be some...

Page 29: ...roxy Address 010 000 000 172 Username Optional Password Optional After setting as above the WAP is ready 2 MMS parameter setting instruction Premise is WAP is valid Setting process Menu Messages MMS M...

Page 30: ...the user s Password Password of the use s E Mail B Incoming server pop3 126 com depend on the user s Email website E Mail Address Full E Mail Address of the user s Password Password of the use s E Mai...

Page 31: ...d in your computer Contact us please when you have any queries 1 Install the USB driver if not yet 1 1 Run the USB driver without the upgrade cable plugged into the computer Figure 1 1 2 After the ins...

Page 32: ...ence enter DEVICE UART and TST config Choose UART1 and Clink done and then the phone restarts After the phone restarts power it off 3 choose the Database of the phone s software 3 1 run Catcher exe ch...

Page 33: ...hen you examine the master phone s problems choose the master phone software s database file and when the slave phone s problems the slave phone s database file The database in the phone must be exact...

Page 34: ...34 Figure 8 4 2 clink button Configure RS232 in figure 9 then figure 10 occurs choose the right COM in Port option and clink OK Figure 9...

Page 35: ...5 use the Catcher to record debug information 5 1 clink the button connect in figure 11 clink the button Default Filter in figure12 select Field Trial button in figure 13 and then clink set in Figure...

Page 36: ...36 Figure 12 Figure 13 5 2 Clink Filter in figure 14 choose some items in figure 15 and then clink ok in figure 15 Please query us if you need to choose the filter settings...

Page 37: ...the phone If the database in the phone is not exactly the same as the chose database in Catcher figure 16 occurs for example different software versions and wrong cable connectors lead to the differen...

Page 38: ...seful primitive information Then the phone user carries on some operations to the phone to make the failures recur After the wanted failures occur wholly clink the button disconnect in figure 19 You c...

Page 39: ...39 Figure 18 Figure 19...

Page 40: ...40 Figure 20...

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