Motorola TALKABOUT T2688 Service Manual Download Page 45

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of 51

GSM Field Service Support

T200 / T2688

Part Number of T200 with SIM Lock

Country

T-option

API p/n

Color

Moto p/n

Descripton

Thailand

AIS/DPC

99.G0521.AOB Copper Orange SA2145AE5X3

SA2145AE5X3,THA ORG

AIS/DPC

99.G0521.AGB Misty Green

SA2145AF5X3

SA2145AF5X3,THA GRN

AIS/DPC

99.G0521.AIB

Teal Ice

SA2145AG5X3

SA2145AG5X3,THA ICE

AIS/DPC

99.G0521.ABB Elec Blue

SA2145AJ3X3

SA2145AJ3X3,THA EBU

Thailand

TAC

99.G0521.BOB Copper Orange SA2151AE5X3

SA2151AE5X3,THA ORG

TAC

99.G0521.BGB Misty Green

SA2151AF5X3

SA2151AF5X3,THA GRN

TAC

99.G0521.BIB

Teal Ice

SA2151AG5X3

SA2151AG5X3,THA ICE

TAC

99.G0521.BBB Elec Blue

SA2151AJ3X3

SA2151AJ3X3,THA EBU

Philippines

T948UJ

99.G0521.JOC

Copper Orange SA2148AE5B1

SA2148AE5B1,PHI ORG

T948UJ

99.G0521.JGC

Misty Green

SA2148AF5B1

SA2148AF5B1,PHI GRN

T948UJ

99.G0521.JIC

Teal Ice

SA2148AG5B1

SA2148AG5B1,PHI ICE

T948UJ

99.G0521.JBC

Elec Blue

SA2148AJ3B1

SA2148AJ3B1,PHI EBU

Philippines

T948UK

99.G0521.KOC Copper Orange SA2148AE5B1

SA2148AE5B1,PHI ORG

T948UK

99.G0521.KGC Misty Green

SA2148AF5B1

SA2148AF5B1,PHI GRN

T948UK

99.G0521.KIC

Teal Ice

SA2148AG5B1

SA2148AG5B1,PHI ICE

T948UK

99.G0521.KBC Elec Blue

SA2148AJ3B1

SA2148AJ3B1,PHI EBU

Philippines

T948UL

99.G0521.LOC Copper Orange SA2148AE5B1

SA2148AE5B1,PHI ORG

T948UL

99.G0521.LGC Misty Green

SA2148AF5B1

SA2148AF5B1,PHI GRN

T948UL

99.G0521.LIC

Teal Ice

SA2148AG5B1

SA2148AG5B1,PHI ICE

T948UL

99.G0521.LBC Elec Blue

SA2148AJ3B1

SA2148AJ3B1,PHI EBU

Philippines

T948UM

99.G0521.MOC Copper Orange SA2148AE5B1

SA2148AE5B1,PHI ORG

T948UM

99.G0521.MGC Misty Green

SA2148AF5B1

SA2148AF5B1,PHI GRN

T948UM

99.G0521.MIC Teal Ice

SA2148AG5B1

SA2148AG5B1,PHI ICE

T948UM

99.G0521.MBC Elec Blue

SA2148AJ3B1

SA2148AJ3B1,PHI EBU

Philippines

T948UN

99.G0521.NOC Copper Orange SA2148AE5B1

SA2148AE5B1,PHI ORG

T948UN

99.G0521.NGC Misty Green

SA2148AF5B1

SA2148AF5B1,PHI GRN

T948UN

99.G0521.NIC

Teal Ice

SA2148AG5B1

SA2148AG5B1,PHI ICE

T948UN

99.G0521.NBC Elec Blue

SA2148AJ3B1

SA2148AJ3B1,PHI EBU

Philippines

T948VD

99.G0521.VOC Copper Orange SA2148AE5B1

SA2148AE5B1,PHI ORG

T948VD

99.G0521.VGC Misty Green

SA2148AF5B1

SA2148AF5B1,PHI GRN

T948VD

99.G0521.VIC

Teal Ice

SA2148AG5B1

SA2148AG5B1,PHI ICE

T948VD

99.G0521.VBC Elec Blue

SA2148AJ3B1

SA2148AJ3B1,PHI EBU

Summary of Contents for TALKABOUT T2688

Page 1: ...T200 T2688 Level 1 2 Service Manual Rev 1 2 ...

Page 2: ... SECTION 3 FEATURE LIST 3 1 List of Features available 9 3 2 Menu 9 3 3 Phone Book 9 3 4 Messages 10 3 5 Call Services 11 3 6 Phone Settings 12 3 7 Networks 12 3 8 Security 13 3 9 Audio Settings 13 3 10 Tools 14 SECTION 4 DISASSEMBLY PARTS 4 1 Dissasembly Introduction 16 4 2 Recommended Tools 16 4 3 Disassembly Procedure 16 4 4 Assembly procedure 16 4 5 Exploded Parts diagram 19 4 6 Part Numbers 2...

Page 3: ...uction 26 6 2 Mechanical repairs 26 6 3 Basic modular troubleshooting 26 6 4 Software Upgrade 28 6 5 Flexing 28 6 6 Testing on DM Tools 29 SECTION 7 ACCESSORIES 7 1 Accessory Introduction 35 SECTION 8 SALES MODELS 8 1 Sales Models Numbers 37 SECTION 9 GLOSSARY OF TERMS 9 1 List of Abbreviations 41 ...

Page 4: ...of 51 GSM Field Service Support iv T200 T2688 SECTION 1 GENERAL ...

Page 5: ...Flexing of product Initiate warranty claims and send faulty modules to Level 3 or 4 repair centres Computer Software Copyrights The Motorola products described in this instruction manual may include copyrighted Motorola computer programs stored in semi conductor memories or other media Laws in the United States and other countries preserve for Motorola certain exclusive rights for copyrighted comp...

Page 6: ...d against epidemic criteria Manufacturing to bear the costs of early life failure 1 2 3 Product Support Customers original units will be repaired but not refurbished as standard Appointed Motorola Service Hubs will perform warranty and non warranty field service for level 2 assemblies and level 3 limited PCB component The Motorola HTC centres will perform level 4 full component repairs 1 2 4 Custo...

Page 7: ...y grounded according to installation instructions for safe operation Users are advised to turn off their equipment when at a refueling point Safety is every driver s responsibility Cellular telephones should only be used in situations in which the driver considers it safe to do so 1 3 3 General DO NOT allow children to play with any radio equipment containing a transmitter DO NOT operate this equi...

Page 8: ...of 51 GSM Field Service Support 1 T200 T2688 SECTION 2 T200 DESCRIPTION ...

Page 9: ...by Current Typically 7 0 ma DRX2 Dimensions 112mm x 46mm x 18 5mm Size Volume 78cc Weight 90g with Battery Temperature Range 20C to 55C Transmitter Function Specification RF Power Output 33 dBm 2dB GSM 30 dBm 2 dB DCS Output Impedance 50 ohms nominal Spurious Emissions 36 dBm from 0 1 to 1 Ghz 30 dBm from 1 to 4 Ghz Receiver Function Specification RF Level 120 dBm GSM 100 dBm DCS RX bit error rate...

Page 10: ...included with the unit New slim and light form factor SMS arriving indication SMS overflow indication Voice Mail arriving indication SMS Cell Broadcast CLI presentation Date and time stamp for last 10 calls USSD MO and Network Originated ALS Calendar Vibrator Phone book holds 100 entries in memory and another 120 in the SIM Card New animatated graphics Calender Calculator functions VibracallTM WAP...

Page 11: ...n to resume after the call Calling Name Presentation This is an improvement on the existing name presentation At present name from phone book is displayed by comparing last 8 digits of Number New feature will show name as sent by the network This is up to 80 characters but will be shortened to 12 for the phonebook This functionality must be subscribed to with network Caller can restrict this On ca...

Page 12: ... T2688 Fig 2 1 Mechanical pictorial Overview Menu access key Microphone Socket Volume Keys Antenna Lens w Talkabout logo Speaker Ports Battery Contacts SIM Contacts SIM Retaining slide Accessory and Charger Port Screw Locations Lanyard Loop ...

Page 13: ...e approximate and will vary depending on network configuration band and status and the functions selected Times are quoted as a range from DRX 2 to DRX 9 Support of DTX mode is dependent on network support and may not be available in all areas Charger Socket Pin Layout 1 Ext AUD MIC IN JTAG TMS Use 2 JTAG TRST Use 3 GND JTAG TMK Use 4 Auxiliary Audio Out JTAG TDI 5 RS232 DSR 6 RS232_RXD 7 RS232_TX...

Page 14: ... Times Identical to Leap maximum charge times shown Battery Charge time with Switch Mode Travel charger to 95 Charge time with Linear Travel charger to 95 600 mAh LiIon 95 minutes 160 minutes 650mAh Ni MH 175 minutes 210 minutes 900 mAh LiIon 220 minutes 260 minutes ...

Page 15: ...of 51 GSM Field Service Support 8 T200 T2688 SECTION 3 FEATURE LIST ...

Page 16: ...io Settings Tools Call Services Network 1st Generation Menu 2nd Generation Menu 3rd Generation Menu 4th Generation Menu Th Generation Menu 6th Generation Menu Phone Book Messages Security Find Record Add Record Dialed PHONE BOOK Last Number Delete Memory Name 1 By Name 2 Delete All 1 Delete all Own Number 1 Dialed 2 Received 3 Missed 4 All Received Missed Delete All 1 Send 2 Edit 3 Delete 4 Move 1...

Page 17: ...roadcast 1 On 2 Off Settings Topics 1 English 16 Chinese Language 1 1 Hour 2 6 Hours 3 12 Hours 4 1 day 5 1 Week Route Center Valid Period Delete All Voice Mail Alert Beep Reply path Notification Format 1 On 2 Off 1 On 2 Off 1 On 2 Off 1 Text 2 Paging 3 E mail 4 Fax 5 Voice 6 Ermes 7 Telex 8 Grp4 Fax ...

Page 18: ...t Call All Calls Call Rate Cost Limit 1 Time 2 Cost Unreachable message Cancel All Call Waiting Divert Voice If No Reply Number 1 Activate 2 Cancel Int l Out In when Roam Cancel All All Incoming message All Outgoing Int l Exc Home Number Cancel Status Activate message 1 Time 2 Cost 3 Clear Time 4 Clear Cost 1 Currency 2 Charge Unit Line in Use 1 Line 1 2 Line 2 Next Call 1 Voice 2 Data 3 Fax ...

Page 19: ...Automatic 1 Available Networks PHONE SETTINGS Auto Redial Answer by Key Lock 1 Auto 2 Any Key 3 Send Key Backlight Language Time Alert Restore 1 English 3 Indonesian Display 1 On 2 Animation 1 3 Animation 2 1 Automatic 2 Prompt 3 Off Confirm 1 On 2 Off Phone Code ...

Page 20: ...work Code Enter Code Enter Password Fixed Dial View SIM Lock Set Status Modify 1 On 2 Off Enter PIN 2 Set Status Change Code 1 On 2 Off Unlock code AUDIO SETTINGS Ring Volume Ring Type 1 Ring 1 6 Melody 1 18 Melody 13 19 Vibrate 20 Vib Ring Keypad Tone 1 On 2 Off Alarm Type 1 Ring 1 6 Melody 1 18 Melody 13 19 Vibrate 20 Vib Ring ...

Page 21: ...of 51 GSM Field Service Support 14 T200 T2688 Set Time TOOLS Set Alarm 1 On 2 Off Calculator Calender 1 On 2 Off ...

Page 22: ...of 51 GSM Field Service Support 15 T200 T2688 SECTION 4 DISASSEMBLY PARTS ...

Page 23: ...80387A95 Ground Cord 66 80334B36 Wrist Band 42 80385A59 Plastic Bladed Tool SLN7223A T6 Torx Driver 4 3 Disassembly Procedure The following set of diagrams will demonstrate the correct sequence and action required to disassemble the T200 The use of the exploded diagram on pages 19 may be of some assistance for part recognition 4 4 Assembly Procedure Once the unit is disassembled and the repair is ...

Page 24: ...the battery latch and remove the battery pack from the housing 3 Using a T5 Torx driver remove the 4 retaining screws 4 Unclip the 2 snap fits from the left and right hand sides of the unit and separate the rear from the front housings 5 Carefully lift the main PCB from the front housing ...

Page 25: ...Service Support 18 T200 T2688 9 Remove keypad from front housing 5 Remove Volume buttons by pulling upwards 6 Insert the pointed end of plastic tool below speaker and pull upwards Replace with new speaker after removal ...

Page 26: ...of 51 GSM Field Service Support 19 T200 T2688 4 5 Exploded Parts Diagram ...

Page 27: ...1 001 Keypad 13 47 G0101 011 Keypad Chinese 14 47 G0104 001 Microphone holder 15 47 G0109 001 Buzzer cap 16 47 G0105 001 Speaker cushion 17 56 07249 071 LCD module 18 60 G0105 001 Volume key switch 19 60 G0109 003 Lower case 20 60 G0108 003 Upper case Blank 21 60 G0108 021 Upper case Yellow 22 60 G0108 011 Upper case Red 23 60 G0108 041 Upper case Blue 24 60 G0108 051 Upper case Silver 25 60 G0108...

Page 28: ...of 51 GSM Field Service Support 21 T200 T2688 SECTION 5 SIM CARDS AND SECURITY ...

Page 29: ...wered on The button should then be pressed for approximatly 3 second until test appears on the display and the correct commands must then be followed Figure 6 1 SIM Card insertion 5 2 Live Sim Card A SIM Subscriber Identity module card will be required to access the existing local GSM DCS PCS cellular network or remote networks when travelling If the roaming agreement has been made with the provid...

Page 30: ...8 0722OKMaster Unlock code for Phone and Sim Lock 7 302 OK Acoustic test 1 Greeting 2 Main VlmGain 3 Input Cal 4 Output Cal 5 Side In Gain 6 Vox Gain 7 Min Mic Engy 8 More a In vlm Gain b Aux Vlm Gain c Silence Prd d Supp Prd e In Volume f Out Volume g Icon h Image i Animation 8 303 OK Settings Saved 9 400 OK ADC Cal val Use with care Contains Calibration factors Please see DM Tools section for ot...

Page 31: ...to the PCB and is stored within the unit s memory The following figure gives a description of the make up of this number Figure 5 3 IMEI label breakdown Some other label number configurations that will be present will be XCVR NUMBER Identifies type of product i e T200 Usually SWF SUG number PACKAGE MODEL NUMBER Determines type of equipment mode in which it was shipped and language with which it wa...

Page 32: ...of 51 GSM Field Service Support 25 T200 T2688 SECTION 6 REPAIR AND TEST PROCEDURES ...

Page 33: ... no replacement PCB available 6 2 Mechanical repairs Assembly replacement level troubleshooting and repair of the T200 is limited to isolation and replacement of the main mechanical parts only See Exploded parts diagram and associated parts list p19 6 3 Basic Modular Troubleshooting The troubleshooting information in Table 2 shows some typical malfunction symptoms and for the corresponding verific...

Page 34: ...splay is erratic or provides Partial or no display a Logic RF Board Assembly Defective Replace Logic RF Assembly refer to symptom 1c Verify that fault has been cleared and replace faulty unit 4 Incoming call alert transducer audio distorted or volume is too low a Logic RF Board Assembly Defective Replace Logic RF Assembly refer to symptom 1c Verify that fault has been cleared and replace faulty un...

Page 35: ...ross if unit now tests OK replace faulty rear housing If not proceed to c c Logic RF Board Assembly Defective Replace Logic RF Assembly refer to symptom 1c Verify that fault has been cleared and replace faulty unit 9 Internal Charger not working a Faulty Charger Attempt to charge unit with known good charger if OK replace charger If fault still exists proceed to b b Logic RF Board Assembly Defecti...

Page 36: ...om tool bar then Set comm port either 1 or 2 the gray dot indicates selected port Set baud rate 19200 to allow flexing access Set eeprom mode default Remove charger jack from download box Note To upgrade the s w from 701205 to 701214 you must use the database file associated with the older version 701205 So in the Choose Database File you would choose 701205 bin instead of 701214 bin To then use f...

Page 37: ...ng the correct files plug phone into cable but DO NOT power on Then hit the download button When you get to this point you have 10 seconds to power the phone on If you don t power the phone on in the 10 seconds then DM Tools will see this as a flash fail Assuming no problems the following screen should be seen during the flashing procedure Screen dump during flash The flashing procedure also flexe...

Page 38: ...and choose the Flex option to obtain the following screen The flex settings are loaded from a file with designation fle and is known as FlexOption Profile The load option is obtained by right clicking the mouse on the DM Tools s window and then selecting Load from Profile The U U T should be powered on first for all flexing operations ...

Page 39: ...options are password protected and can not be changed manually unless the key and password are known TEST COMMANDS Select View from tool bar and highlight MMI Test to obtain the following screen Then tick the appropriate test and press the MMI Test button and follow instructions ...

Page 40: ...of 51 GSM Field Service Support 33 T200 T2688 SECTION 7 ACCESSORIES ...

Page 41: ...ed US without holes in prongs for the PRC UK Euro Aust NZ India Switch mode Travel Charger Input 90 260V varies by plug type for each country AC Output 6V 750 mA Cigarette Charger Input 12 24V DC Output 6V 750 mA Portable Hands free plugs into butt plug Desktop charger base conceptual design Linear Travel Charger Input voltage and plug requirements per each country AC Picture not available Picture...

Page 42: ...of 51 GSM Field Service Support 35 T200 T2688 SECTION 8 SALES MODEL NUMBERS ...

Page 43: ...8UD 99 G0521 DBF Elec Blue SA2143AJ3B1 SA2143AJ3B1 AU EBU Australia T948UE 99 G0521 EOF Copper Orange SA2143AE5B1 SA2143AE5B1 AU ORG OneTel T948UE 99 G0521 EGF Misty Green SA2143AF5B1 SA2143AF5B1 AU GRN T948UE 99 G0521 EIF Teal Ice SA2143AG5B1 SA2143AG5B1 AU ICE T948UE 99 G0521 EBF Elec Blue SA2143AJ3B1 SA2143AJ3B1 AU EBU Australia T948UF 99 G0521 FOF Copper Orange SA2143AE5B1 SA2143AE5B1 AU ORG D...

Page 44: ...RN T948US 99 G0521 SIH Teal Ice SA2150AG5B1 SA2150AG5B1 SG ICE T948US 99 G0521 SBH Elec Blue SA2150AJ3B1 SA2150AJ3B1 SG EBU Maly SGP T948UW 99 G0521 WOH Copper Orange SA2150AE5B1 SA2150AE5B1 SG ORG T948UW 99 G0521 WGH Misty Green SA2150AF5B1 SA2150AF5B1 SG GRN T948UW 99 G0521 WIH Teal Ice SA2150AG5B1 SA2150AG5B1 SG ICE T948UW 99 G0521 WBH Elec Blue SA2150AJ3B1 SA2150AJ3B1 SG EBU Maly SGP T948UX 99...

Page 45: ...reen SA2148AF5B1 SA2148AF5B1 PHI GRN T948UK 99 G0521 KIC Teal Ice SA2148AG5B1 SA2148AG5B1 PHI ICE T948UK 99 G0521 KBC Elec Blue SA2148AJ3B1 SA2148AJ3B1 PHI EBU Philippines T948UL 99 G0521 LOC Copper Orange SA2148AE5B1 SA2148AE5B1 PHI ORG T948UL 99 G0521 LGC Misty Green SA2148AF5B1 SA2148AF5B1 PHI GRN T948UL 99 G0521 LIC Teal Ice SA2148AG5B1 SA2148AG5B1 PHI ICE T948UL 99 G0521 LBC Elec Blue SA2148A...

Page 46: ...of 51 GSM Field Service Support 39 T200 T2688 SECTION 9 GLOSSARY OF TERMS ...

Page 47: ... Transceiver Station BTS Color Code BCCH Broadcast Control Channel BCD Binary Coded Decimal BGA Ball Grid Array BCU BTS Control Unit Bm Full rate traffic channel BN Bit Number BS Base Station BSC Base Station Controller BSIC Base Transceiver Station Identity Code BSS Base Station System BSSAP BSS Application Part DTAP and BSSMAP BSSC Base Station System Control Cabinet BSSMAP Base Station Systems ...

Page 48: ...Ec No Ratio of energy per modulating bit to the noise spectral density EGSM Extended Group special Mobile EFR Enhanced Full Rate EIR Equipment Identity Register EIRP Effective Isotropic Radiated Power EMC Electromagnetic Compatibility EMX Electronic Mobile Exchange ETSI European Telecommunications Standards Institute FACCH Fast Associated Control channel FACCH F Full rate Fast Associated Control c...

Page 49: ...cedure DM mobile D channel Lm Traffic channel with capacity lower than Bm LPC Linear Predictive Code LR Location Register MA Mobile Allocation MAH Mobile Access Hunting MAI Mobile Allocation Index MAIO Mobile Allocation Index Offset MAP Mobile Application Part MCC Mobile Country Code MCI Malicious Call Identification MD Mediation Device ME Mobile Equipment MF Multi Frequency tone signaling type ML...

Page 50: ...itched Telephone PTO Public Telecommunications Operator QOS Quality of Service RAB Random Access Burst RACH Random Access Channel RBDS Remote BSS Diagnostic Subsystem RBU Remote Base Station Unit PCN RCU Radio Channel Unit REC Recommendation REL Release RELP LTP Regular Pulse Excitation Long Term Prediction REQ Request RFCH Radio Frequency Channel RFN Reduced TDMA Frame Number RLP Radio Link Proto...

Page 51: ...rate speech TCH TCH HS A half rate speech TCH TCP Transmission Control Protocol TDMA Time Division Multiple Access TE Terminal Equipment TMN Telecommunications Management Network TMSI Temporary Mobile Subscriber Identity TN Timeslot Number TRX Transceivers TTY TeleTYpe refers to any terminal TS Time Slot TUP Telephone Users Part UI Unnumbered Information frame Um Air Interface USSD Unstructured Su...

Page 52: ...Topaz T2688 T200 T2988 T205 L3 Circuit Description 1 Motorola Proprietary Information T2688 T200 T2988 T205 Level 3 Circuit Description 01 03 01 V1 3 ...

Page 53: ... 0V 3 6V 3 6V 0V 0V 0V GSM TX 3 6V 0V 3 6V 0V 0V 2 8V DCS RX 0V 3 6V 3 6V 0V 2 8V 0V DCS TX 0V 3 6V 0V 3 6V 2 8V 2 8V 5 The appropriate frequency is then fed out from U501 Pin 5 GSM GSM_RX or from Pin 7 DCS DCS_RX 6 The received frequency is then fed into a Dual Band select SAW Standing Acoustic Wave filter U602 Loss approximately 5dB The GSM received frequency is then applied to the base of Low N...

Page 54: ... DCS OFF ON OFF 1st Mixer GSM ON OFF OFF 1st Mixer DCS OFF ON OFF 2nd Mixer ON ON ON PGA ON ON ON I Q Demodulator ON ON ON 7 The gain of the Low Noise Amplifiers is approximately 18dB The amplified signal is then fed onto Dual Image rejection SAW Standing Acoustic Wave filter U601 an identical filter to U602 Loss approximately 2dB 8 The output is fed out of the filter on Pin 7 for GSM and Pin 5 fo...

Page 55: ...e 270Mhz this will be mixed with the incoming 1st IF of 225Mhz to give a resultant 2nd IF of 45Mhz this is then tuned by the 45Mhz tank Circuit consisting of C637 and L616 The 45Mhz signal carrying the modulation will then be fed into a phase comparator where it will be demodulated by a reference 45 MHz signal created form the 540Mhz signal which has passed through the divide by 2 and then though ...

Page 56: ...pling rate of 270 8KHz 24 This gives us a low enough frequency for adjacent channel rejection and therefore channel separation 19 Calibration of the IQ paths is achieved by internally shorting out the 2 input I paths and then the same again on the 2 input Q paths the digital value measured will then be stored in a register Once the RXI and Q paths are reconnected to the circuitry again the calibra...

Page 57: ...if some data is lost whilst travelling OTA then for example instead of 8 bits of speech data being lost only 4 bits of speech and 4 bits of redundant data De Segmentation and CRC Attachment analysis During the transmission process the data is broken into packets of various lengths No of bits These packets are then processed to give a checksum of what should be expected at the receiver Once in the ...

Page 58: ... d and a high frequency noise tone is injected into the signal This noise will be used for programming the PGA There are 7 programmable gains and 1 mute function 26 The noise is then removed in a smoothing filter and the appropriate gains or attenuations made 27 The converted speech can then take 1 of 2 paths 28 Path 1 to the Internal speaker LS1 the audio is fed out of the VEGA on Pins 32 33 and ...

Page 59: ...signal will be driven through a PGA with a gain of between 12dB to 12dB in 1dB steps 35 A Sigma Delta Modulator converts the signal from analogue to Digital sampled at 1Mhz The signal is the decimated and the sampling rate taken down to signal samples at 8Khz 36 Once again as in RECEIVE the loop between the VEGA IC and the GEMINI IC is put in place for standard data processing 37 The transmitted s...

Page 60: ... width of BENAPin 71 when BULON is active Pin 74 actual effective transmission burst length BENA 32 bits 43 Calibration of TXI Q paths can be set during the BCAL timing window 44 The analogue information is now sent from VEGA Pins 57 60 to the TX RX IC on the TX I Q lines Pins 13 16 45 The signal routing for the TX I Q through the TX RX IC is as follows 46 The TXI Q signals are routed to 2 modulat...

Page 61: ... 6 with the TX frequency being fed out on Pin 1 The voltage TX2V8 which is switched by the signal TXVCO_OFF supports the TXVCO The signal BS Pin 5 controls whether the TXVCO produces a DCS or GSM output 53 As the TXVCO produces both GSM900 or DCS1800 frequencies from the same output line the signal must be fed into a diplexer U605 this circuit uses inductive properties to effectively delay 1 frequ...

Page 62: ... the PA back stage Pin 8 controls the PA power saturation The Sense Resistor R203 0 033 ohm is used to sense the voltage variations on the VBAT line when the PA draws more or less current and is connected to Pin 4 of Q201 The transistor is biased on using VBAT Pin 5 and the change in voltage over the sense resistor is throughput from Pin 4 to Pin 3 From here it will vary the non inverting input of...

Page 63: ...the signal LO2 and is fed in on Pin 3 finif To complete the phase lock loop 72 On the RF side the supporting voltage is again SYN2V8 and enters on Pin 11 vccrf The charge pump output for the TXVCO is fed out on Pin 8 Dorf to the RXVCO U401 Pin 3 U401 is supported by SYN2V8 73 The band select signal BS enters U401 on Pin 4 and will select the appropriate output to either GSM or DCS on Pin 1 The out...

Page 64: ... and Pin 16 out SIM Block Pin 3 80 SIM I O also acts as a SIM Presence detect signal 81 Power for the unit can be taken from either internal Battery or from an external source The battery has 4 contacts from battery connector JP2 Pin 1 Supplies VBAT directly Pin 2 BATEMP is used to monitor Battery temperature during charging and is fed to VEGA for A D processing Pin 3 BAID is Battery ID and is use...

Page 65: ...via software IO1 by U25 90 For Power output when using the data cable VBAT is fed onto the source S2 of U26 with U29 providing gate bias D12 is forward biased for this 1 application 91 The real time clock is generated by crystal X2 and runs at 32 768MHz It is driven by the charge pump from U46 Pin 1 OSC1 Synchronisation is achieved by IO14 which is clock generated by Gemini pin 50 with the IC enab...

Page 66: ... vibrator support voltage VBAT a path to earth through BQ1 100 U6 provide EMF protection 101 The buzzer alert is operated using the signal BUZZER from Gemini Pin 20 this signal forces BQ4 to conduct creating the current path for the buzzer U8 support voltage VBATto earth 102 U7 Provides EMF protection for the buzzer Keypad and Back lights 103 The backlights are split into 3 for the LCD D1 D3 and t...

Page 67: ...s Function Key COL0 COL1 COL2 COL3 ROW 0 ROW 1 ROW 2 ROW 3 ROW 4 2 S1 0 0 S2 0 0 7 S3 0 0 4 S4 0 0 1 S5 0 0 6 S6 0 0 3 S7 0 0 0 S8 0 0 8 S9 0 0 5 S10 0 0 LEFT S11 0 0 RIGHT S12 0 0 S13 0 0 9 S14 0 0 YES S15 0 0 NO CLR PWR S16 No Matrix used S16 switches VBAT directly onto the PWR signal to power up the unit CLEAR S17 0 0 ...

Page 68: ...nge There is no other hardware difference to the product PCB is the same and other mechanical parts are the same Software is different Version 3 X is Refresh software with additional features for T2988 Asia and T200 EMEA Additional features covered are 1 WAP 2 Quick Access Interface 3 QuickNotes Pre stored User Definable SMS Message 4 Scheduled Power On Off 5 Thai and Vietnamese prompt 6 SIM Lock ...

Page 69: ... 25 20 21 22 23 IF_TUNE 7 To VEGA To VEGA TX_ON 44 45 46 From GEMINI BS 35 To U603 From Synthesiser TXI TXQ 13 14 15 16 2 1 BS SEE PAGE 8 9 OF LEVEL 3 CIRCUIT DESCRIPTION 11 8 9 90 deg 45 MHz TX_DCS TX_GSM 90 o TX LOOP FILTER 6 1 TX2V8 10 5 U605 Diplexer 5 1 3 TX_GSM TX_DCS U201 PA 2 4 12 10 6 8 U202 PA CONTROL BS BS 16 RAMP From VEGA RAMPDA 3 5 1 4 VBAT 14 R203 VBAT 0 033Ohm 4 1 2 3 5 6 TXON VBAT...

Page 70: ...klights PWR 2 PWR CHGERP 1 CHGERP LCDRST 25 U28 SIM SIM Interface 20 VSIM 5 4 RST 3 16 19 1 CLK 15 2 S_I O S_RST S_CLK S_PWST S_3V5V To Gemini S_I O S_RST S_CLK S_PWST S 3V5V 105 100 103 104 102 To U27 Power Management IC SIM_PD SIM I O BATTERY JP2 VBAT 1 2 BATEMP To VEGA 37 38 BATEMP BATID BATID From Batt 3 4 A3 S D G U30 IO9 IO9 From Charger CCt BQ6 BQ3 U29 C81 IO11 To Gemini From Gemini IO11 To...

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Page 75: ...5 0 1UF 0603 R8 10K R92 68K 1 TP6 1 TP5 1 U48 VCE 2 1 C34 33PF TP8 1 U5 VCE 2 1 X1 MICROPHONE U49 VCE 2 1 C73 X C76 X R67 100K TP21 1 R60 100K R59 100K U46 PCF8563 OSCI 1 OSCO 2 nINT 3 VSS 4 SDA 5 SCL 6 CLK 7 VDD 8 R82 10K R77 100K R58 X R68 100K R102 5 6K R100 10K U54 DAN222 1 3 2 U53 DAN222 1 3 2 C66 0 01UF X7R R87 100 R89 47K R88 47K C53 0 1UF 0603 C57 0 47UF C52 4 7UF 10V 0805 C59 0 1UF C75 X ...

Page 76: ...p U601 EFCH9418MTY6 GSM 7 DCS 5 DCS 3 GSM 1 6 6 4 4 2 2 8 8 C626 0 1u Q601 BFP420 1 3 4 2 U605 LFDP20N0020A DCS 3 2 2 GSM 1 4 4 IN 5 6 6 R621 10dB_PAD 1 2 3 4 C607 100p U502 74LCX00MTC A0 1 B0 2 O0 3 A1 4 B1 5 O1 6 GND 7 O3 8 B3 9 A3 10 O2 11 B2 12 A2 13 VCC 14 U606 ENFVZ4G00 2 2 OUT 1 3 3 VT 6 4 4 SW 5 7 7 VCC 10 9 9 8 8 C601 1p R622 10dB_PAD 1 2 3 4 C641 10p L503 5n6 0603L R614 47k C660 15p C647...

Page 77: ...ntensity Contrast 5 403 OK List the Manufacturing Informations 6 1998 0722OK Master Unlock code for Phone and Sim Lock 7 302 OK Acoustic test 1 greeting 2 Main VlmGain 3 Input Cal 4 Output Cal 5 Side In Gain 6 Vox Gain 7 Min Mic Engy 8 More 1 In vlm Gain 2 Aux Vlm Gain 3 Silence Prd 4 Supp Prd 5 In Volume 6 Out Volume 7 Icon 8 Image 9 Animation 8 303 OK Settings Saved 9 400 OK ADC Cal val use with...

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Summary of Contents for TALKABOUT T2688

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Motorola TALKABOUT T2688, Service Manual

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Summary of Contents for TALKABOUT T2688

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