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NEC DB2000 Service Manual
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NEC DB2000 Service Manual

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DB2000
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Summary of Contents for NEC DB2000

  • Page 1 DB2000 Help Service Manual...
  • Page 2 Introduction This is the Electronic Service Manual for the MP5J1L1 Dual Band GSM Digital Cellular Telephone from NEC. It contains specific information on repair and test procedures. For details on user functions, general operation and installation, please refer to the User Guide.
  • Page 3            ...
  • Page 4 Important                             !"#$%"$&  !' '  '        !'         (   )     *   +       ,                   - #   "   '        .     !                One incorrect adjustment may result in the need for many more and result in extra   )   .        (    #*   • )   /       0    •                 •...
  • Page 5 '      !                       '            2     #  +  3#+4    2                2 2  *            $  2 #+                  2  0                 0    *       0    5   #  *     !3  4   2     #              '      6  !             2    $7'+2        2   22 *       " '    !                0      #'89   :+2  +    *   *    2    " " #*             %   . *         2     2        '       2 2      2       2 ...
  • Page 6    +   "     *   *              $           '(     ;  <   '(  *    2       !        .     * 0 .       $ .               2           2 #           * 3 2      '(  46    2    =  '  '      2                 '(          $#*  '    % *       "*           *     '   (              '          equipment is heavily soiled a soft cloth dampened with a mild synthetic detergent       2  =       *   "   2          3    >4...
  • Page 7 #   # *   =   !             #           2       < =  6  $        2    =                 2        '    $  *     2             )  #'      " .  $  2 " .      *     2           3   4         *       '               2  2    *   0         *      ?        2                =            ...
  • Page 8 '(<         2       $              '(        '  • +    • '      ...

  • Page 9: Specifications

    << Previous Section Next Section >> Main Menu Section 2 Unit Specifications...
  • Page 10 Performance General General DB2000 (Standard Battery) Talktime 150 mins Standby 300 hours Dimensions 130 x 45.5 x17.5 Volume 100cc Weight 130g SIM Size Plug in SIM RF power output Class 4 GSM Transmitting Frequency Range: GSM: 890 - 915 Mhz...

  • Page 11: Low Channel (Ch

    Transmitter (GSM) Frequency Stability < +/- 90Hz RF Power Output 33dBm Power Levels 11, decrementing in 2dB steps Power Control Level 5 33dBm +/-2dB Power Control Level 6 31dBm +/-3dB Power Control Level 7 29dBm +/-3dB Power Control Level 8 27dBm +/-3dB Power Control Level 9 25dBm +/-3dB...
  • Page 12 Transmitter (PCN) Frequency Stability < +/- 180Hz RF Power Output Power Levels Power Control Level 0 30dBm +/-2dB Power Control Level 1 28dBm +/-3dB Power Control Level 2 26dBm +/-3dB Power Control Level 3 24dBm +/-3dB Power Control Level 4 22dBm +/-3dB Power Control Level 5 20dBm +/-3dB...
  • Page 13 Receiver (GSM) RX Frequency Input Low Channel (Ch 1) 935.2 MHz Mid Channel (Ch 62) 947.4 MHz High Channel (Ch 124) 959.8 MHz RX Frequency Calculation (F 935 + (ARFCN x 0.2) = F RX UHF VCO Frequency 1160-1230 MHz Low Channel (Ch 1) 1205.2 MHz Mid Channel (Ch 62)
  • Page 14 << Previous Section Next Section >> Main Menu Section 3 Circuit Description Part 1 Receiver Part 2 Transmitter Part 3 Power Amplifier Control Part 4 13Mhz Clock Part 5 Power Supplies and Control Signals (RF) Part 6 Logic Circuit Descriptions...
  • Page 15 Part 1 : Receiver The front end The RF receive signal (GSM 935Mhz - 960Mhz, PCN 1805Mhz-1880Mhz) is input via the antenna or coaxial connector S400. The coaxial connector has a built in switch, which is used to switch between the antenna and auxiliary RF input. See Fig.1: The Receiver.
  • Page 16 Fig.1: The Receiver PMB2410 RX_ON2 (IC300) V_G_LNA 270Mhz To IF Amp 20 21 FL302 FL303 FL304 FL300 FL301 L305 Mechanical V_P_LNA Diplexer Switch GSM RX = 935-960Mhz PCN RX =1805-1880Mhz External RF The rf signals from L305 form the inputs to the active double-balanced rf mixer of IC300 #13-#14.
  • Page 17 Fig.2:The UHF Synthesiser (RX) IC201 LMX2331L RF-PLL SERLT SERCK 11,12,13 PHASE SERDA COMPARATOR EG :1205Mhz (GSM) 13MHz PRE- SCALER 200Khz 200Khz PHASE V_VC01/2 DIFFERENCE (CURRENT) PHASE DIFFERENCE (VOLTAGE) UHF VCO LOOP FILTER (IC202/3) UHF Synthesiser (Rx) The RX & TX UHF Synthesisers are implemented within IC201- LMX2331L. The RX UHF VCO output is fed to IC201 #5, where it is divided down (via a Prescalar) to a 200khz signal and input to a phase comparator.
  • Page 18 Fig.3:The IF AMP and Demodulator :-PGSTR AGC Control SYGCCL 11,12,13 PMB2410 (IC300) SYGCDT RINO 270Mhz RIPO First Mixer RINO RQNO RQPO Div2 540MHz RX_ON2 Div2/3 1st IF 270Mhz PUPLO2 32-35 20-21 23-24 Varactor Network GSM_TX D303 (A,B) TO W2013 (IC100) (TX IF Modulator) FL304 LOOP FILTER...
  • Page 19 Fig.4:The IF Synthesiser (RX) IC201 LMX2331L IF-PLL IC300 PHASE COMPARATOR 180Mhz 13MHz 180Mhz 23-24 1Mhz 1Mhz DIV 180 GSM_TX PHASE DIFFERENCE (CURRENT) PHASE DIFFERENCE 540Mhz D303B (VOLTAGE) GSM_TX =”1”= 180Mhz LOOP FILTER GSM_TX =”0”= 270Mhz D303A 34-35 PUPLO2 The RX IF Synthesiser The IF synthesiser (IF- PLL) is contained within IC201 - LMX2331L.
  • Page 20 Part 2 : Transmitter Fig.5:TRX -The TX IF Modulator W2013 (IC100) PMB2410 (IC300) 540Mhz Osc IF-PLL GSM_TX Div2/3 TIF Filter 270MHz 3V_G_TX 180 - 270Mhz To IC101 TIPI TR106 TINI TQPI 3V_P_TX TQNI To IC102 TIF Filter W2013 180MHz TR107 2v85_rf3 (1,16,20) The TX IF Modulator...
  • Page 21 Fig.5: The IF Synthesiser (TX) IC201 LMX2331L IF-PLL IC300 PHASE COMPARATOR 180 or 270Mhz 13MHz 180 or 270Mhz DIV 180 1Mhz 1Mhz or 270 23-24 GSM_TX PHASE DIFFERENCE (CURRENT) 540Mhz PHASE DIFFERENCE D303B (VOLTAGE) LOOP FILTER D303A PUPLO2 The TX IF Synthesiser TX IF Synthesiser(IF-PLL) is the same PLL as used in the RX process and is located within the LMX2331L (IC201).
  • Page 22 Fig.6: The UHF Mixer / Amplifier (IC101 / IC102) GSM VCO = (1160-1230MHz) TCXO PCN VCO = (1530-1610MHz) (IC203)VCO V_VCO1 RF-PLL (IC202)VCO V_VCO2 To IC103 270Mhz - W2013 PMB2333 GSM_PRE_ON 180Mhz - W2013 To FL103 PMB2333 3V_P_TX The UHF Mixer Amplifier The PM2333 IC’s (IC101/102) converts the IF modulated signal to RF and incorporates an active double-balanced mixer.
  • Page 23 Fig.7: The UHF Synthesiser (TX) IC201 LMX2331L RF-PLL SERLT SERDA 11,12,13 PHASE SERCK COMPARATOR EG:1160Mhz (GSM) 13MHz 200Khz PRE- 200Khz SCALER PHASE V_VC01/2 DIFFERENCE (CURRENT) PHASE DIFFERENCE (VOLTAGE) UHF VCO LOOP FILTER (IC201/2) The TX UHF Synthesiser The TX UHF Synthesiser (RF-PLL) is the same as the PLL used in the RX and is contained in the LMX2331L (IC201).

  • Page 24: Gsm_Pre_On

    Part 3 : The P.A. Circuit and its Control Fig.8: The Power Amp Circuit To Antenna PCN = (1710-1785MHz) GSM = (890-915MHz) (FL106) (IC106) (IC103) From IC101 mech Diplexor switch (IC105) V_ERROR GSM_PRE_ON TXP_MOD (FL105) (FL103) (IC107) From IC102 (IC104) (IC108) PCN_PRE_ON V_ERROR...
  • Page 25 The signals 3V_P_TX and 3V_G_TX are controls supplies used to enable the two power control op-amps IC105 and IC108. The output from the P.A follows the TX path, which uses the control supplies:- GSM_PRE_ON or PCN_PRE_ON to enable the TX switching diodes D400/D401. The RF signal then passes through the diplexor and onto the antenna.
  • Page 26 Part 4 : 13Mhz Clock IC201-#8 (IF/RF PLL) 2V8_RF1 2V8_RF1 13Mhz To Logic Board X200 TR204 6 5 2 The 13Mhz-clock (X200) consists of a TCXO ( Temperature Compensated Crystal Oscillator ) which oscillates at a frequency of 13Mhz. It is used within the LMX2331A Synthesisers on the TRX board and also in the Superchip and Nell on the logic board.
  • Page 27 Part 5: Power Supplies and Control signals (RF Board) 5.1: MicroMoe IC204 – Power Supply IC The RF section has its own dedicated power supply device called: MicroMoe. This is a smaller version of the ASIC MiniMoe, which is located on the logic board. MicroMoe performs all power supply requirements of the RF circuitry, except for a dedicated 5-volt supply (5VRF) for the UHF VCO’s which is supplied from MiniMoe.
  • Page 28 GSM_TX Control signal from IC27 #23 which switches the 2V8_RF3 supply to give 3V_G_TX. It also sets the internal frequency divider inside IC300. PCN_TX Control signal from the superchip, which switches the 2V8_RF3 supply to give 3V_P_TX. 3V_G_TX Switched version of 2V8_RF3 to power the PMB2333 IC in the GSM TX path.
  • Page 29 Part 6: Logic Circuit Description This section describes the architecture and hardware functionality of the logic circuit. The logic circuit performs the following functions: • Channel coding/ decoding • Speech coding / decoding • Data encryption • Layer 1,2 and 3 software tasks •...
  • Page 30 6.1 “Superchip” (CSP and DSP combined) - (IC27) The superchip is the interface between the RF circuitry, the audio circuits and the digital domain. It also carries out layer 1 signal processing, this includes data coding/decoding, data interleaving/de-interleaving, error detection/correction and provides burst generation data. Unlike previous versions of DSP package which used external static random access memory (SRAM) devices for data storage of signal processing operations.
  • Page 31 • Receive I and Q inputs I/O: RQNO, RQPO, RINO and RIPO (#77-80) • Audio outputs for hands free operation O/P: RXAF- and RXAF+ (#95-96) • Audio output to earpiece O/P: AOUTN and AOUTP (#93-94) • Audio inputs from microphone I/P: MICOUT and MICIN (#4-5) •...
  • Page 32 • Interrupt generation to NELL I/O: This bit I/O port performs interrupt control of NELL: EXTINT(#73) • Superchip interrupt and reset inputs The superchip has the following interrupt and reset inputs: I/P: DSP INTO (#48) - DSP Interrupt 0 DSPRSTB (#50) - DSP Reset bar •...
  • Page 33 • I/O System Connector Interface - P5 • Analogue Signal Measurement • Charge Control • Real Time Clock • CPU Timers The NELL is divided into two main function blocks:- The Isolated Logic Block (ILB) The CPU core, peripherals and interfaces. 6.2.1 The ILB Block The ILB’s main functions are:- •...
  • Page 34 • A 5 channel 8 bit A/D converter used for battery management and to measure the pcb temperature CPU Memory Flash PROM - (ICI 5) An 8Mbit programmable ROM which is capable of being written to while still in circuit. Contains all the main command software for the HHP Static Random Access Memory (SRAM) - (IC9) A 16 bit (64k by 16) temporary memory device which is used by NELL for CPU program execution.
  • Page 35 These monitor’s being :- BATTEMPMON (Battery Temperature Monitor) - NELL (#L9) BATID (Battery Identification) - NELL (#N9) The battery pack includes an internal thermister, which is used to produce the analogue signal BATTEMPMON. This enables the HHP and external charger to determine the battery temperature, which is used to protect the battery from overheating while charging.
  • Page 36 Figure 10a. CSP and DSP Functional block diagram G4H Functional Block 2v85_ln Diagram bit manipulation cipher_block_int unit csp_dsp_reset dsp1600 core "CSP1089 core" nell_to_dsp_int (INT0) A5.1/A5.2 "CSP and DSP cores" frequency correction Combined in Superchip 1 tx_I I & Q gmsk 160-bit tx error correction modulator...
  • Page 37 Figure 10b. NELL and Memory G4H Functional Block 2v85_main 32_khz_clk isolated logic block Diagram nell 32_khz_clk real time clock psu sync cal trig counter timer & wdt not connected generator 13_mhz_clk NELL and Memory rtc alarm 13_mhz_clk keycol(0:3) 32 kHz calibration cntr keyrow(0:5) start/stop pulse width...
  • Page 38 6.4.2 Power Supply MiniMoe - (IC19) MiniMoe is a dedicated power supply, which provides most of the power requirements for the logic circuit. The RF section has its own dedicated power supply device MicroMoe which is separate to MiniMoe, except for a dedicated 5 volt supply (5VRF) for the VCO’s.
  • Page 39 6.4.3 Reset :- ILBRST / UVLO2 The MiniMoe generates a reset pulse (active low) to the NELL (#L4 -ILBRST) when it detects that the battery voltage is below the UVLO2 threshold of (2.85V- 3.1V). The device also disables internal regulators R2, R3, R5, R6, and R7, this then holds the ILB in reset mode, allowing only the real time clock to run.
  • Page 40 In this mode all the logic circuit is powered and the RF sections are switched on as required. The different modes and power states are illustrated in table.2 Functional Block Table 2 - DB2000 Power States ILB Reset Hard Off Soft Off...
  • Page 41 MiniMoe Functional UVLO 1 Detector Diagram (2.6 volts) TR25 Battery and Power Supply backup +3VILB disable 2.85v Regulator 1 lcd_pwer_drv cpu ram MiniMOE UVLO 2 Detector HARD_PWR (3 volts) (not used) RG3VPWR +3VNELL disable 2.85v Regulator 2 cpu flash eeprom backlight nell 2v85_ref...
  • Page 42 6.4.5 Power Up Power up of the mobile can be initiated by one of three ways:- 1. Power Key Press The Power key button is connected to the input KEY1 of NELL #H2. The input (KEY1) has an internal pull-up resistor, which is grounded, when the power key (SW20) is pressed.
  • Page 43 Keypad, Display and SIM Interface 6.5.1 Keypad and Display The keypad and display forms part of the logic board and consists of the following: • Key switches (4 [N1]x 5 Matrix) • LCD module (72 x 32 Graphical based display module) •...
  • Page 44 Figure.10d: KeyPad, Display and SIM Interface 6.5.4 SIM Interface The SIM interface includes a voltage level shifting circuit, which allows the DB2000 to operate with both 3 and 5 volt SIMs.The SIM interface is managed by NELL via five control signals: 1. SIMPWR (NELL#L5) This output from NELL connects to MiniMoe (IC19) #20.
  • Page 45 3. SIMCLK (NELL#M5) This output connects to the SIM connector (#3). It is used to clock data to and from the SIM card and can be switched off when not required in order to save power. 4. SIMDT (NELL#N5 - SIMDATA) This output connects to SIM connector (#6).
  • Page 46 Earpiece 6.6.2 6.6.2 The earpiece is driven directly from IC27 AOUTP(#94) and AOUTN(#93) pins. The gain is controlled by the DSP software element within IC27. The earpiece is located in the handset front panel, and the signals are routed to it via two connection pads on the front of the logic board.
  • Page 47 The SHF lead is connected to the DB2000 via a small jack plug, which plugs into a socket mounted into the side of the mobile. When the SHF lead is plugged in, the mobiles mic and earpiece are disconnected.
  • Page 48 Figure.10E: Audio and Miscellaneous Interfaces +3VAUDIO SHFREE NELL #B7 AOUT BP AOUT BN MIC IN VREG RXAF+ C/KIT AF OUT Superchip RXAF- (IC27) VBAT +3VNELL NELL (M14) +3VAUDIO AGND TXAF+ 99 AUX IN C/KIT AF IN BUZZER TXAF- IC13...
  • Page 49 << Previous Section Next Section >> Main Menu Section 4 Section 4 Servicing Servicing Part 1 Cables, Jigs and Fixtures Part 2 Equipment Configuration Part 3a Disassembly Part 3b Assembly...
  • Page 50 Part 1: Cables, Jigs and Fixtures Detailed below are a range of cables, jigs and fixtures available for use on repair and test/calibration stations. Inter-board Connector Assembly (M5-SP0104) This provides the connection between the logic and the TRX boards, while the HHP is disassembled.
  • Page 51 Repair Fixture (M5-SP0109/A) This provides a stable platform for both the logic and TRX boards, while undertaking repair and fault finding. It is designed to allow access to both sides of the boards and should be used in conjunction with the Inter-board Connector Assembly.
  • Page 52 RF Measuring Cable (M5-SP0100) This provides a RF connection to the HHP for signal monitoring/injection or HHP call sequence testing. It is approx. 1metre in length and is terminated in a SMA connector. Data Test Cable (M5-SP0101) The Data cable can be used on both repair and test/calibration systems to enable control of the HHP through the I/O port.
  • Page 53 Dummy Battery (M5-SP0102) ) The Dummy Battery will supply d.c. power to a fully assembled HHP. It can be connected to a d.c. power supply or to the GSM Test Jig.
  • Page 54 GSM Test Jig (M5-SP0110) This unit enables Test Mode on the HHP and allows entry of commonly used test sequences via a menu system. It also provides remote operation of the HHP keypad. The LCD unit indicates the menu status and displays information from the HHP LCD.
  • Page 55 DB2000 Serial Level Converter (M5-SP0106) The DB2000 Serial level converter acts as a 25 to 9 way interface between the PC controller and the HHP in the test/calibration system. The DB2000 Serial level converter requires an external 3.8V supply. The D.C...
  • Page 56 (optional) RF Test Cable GSM/PCN Test Jig DB2000 Repair Fixture Data Test Cable This configuration is only an illustration of the types of equipment required. The requirement for a Spectrum Analyser in each set up will be dependent upon which...
  • Page 57 This configuration is essential for component level repair, as calibration of RX and TX circuits is required on every repair. The system will be controlled by software provided by NEC Technologies (UK) Ltd, which supports the equipment detailed in the illustration. This equipment is: •...
  • Page 58 Part 3a: Disassembly Caution: Ensure an Anti-Static strap is worn and connected to an earth bonded Caution: Ensure an Anti-Static strap is worn and connected to an earth bonded bench before handling any components. bench before handling any components. Antenna Removal. The Thread Antenna can be removed from the HHP assembly by hand.
  • Page 59 Removal of screws from the B - Cover Two M1.6 countersunk screws Using a T6 Torx Screwdriver Remove the two M1.6 countersunk screws located towards the bottom of the HHP assembly.
  • Page 60 Removal of the HHP assembly from the A - cover Grip the bottom of the HHP assembly and gently lift the B – cover with Assembly away from the A - cover. This is made easier by gently easing the A - cover sidewalls out, since this will disengage the positioning clips on the B- cover.
  • Page 61 Removal of keymat from A-Cover assembly Remove Keymat from A-Cover, ensuring that the metal pads remain in the back of the keymat. Removal of the Window assembly from the A-Cover. By gently pressing against the Window assembly from the rear side of the A-Cover the Window will push out.
  • Page 62 Disconnecting the Vibrator Disconnect the vibrator by gently pulling the vibrator connector from the socket. Ensure the vibrator wires are kept away from the Baseband Assembly when removing the Baseband board.
  • Page 63 Removing the Baseband board Assembly screws The two 1.8 x 12mm pan head screws need to be removed using a torx T6 screwdriver. This will allow access to the Baseband and TRX Assembly. Removal of Baseband board from B-Cover Assembly A –...
  • Page 64 Removing the LCD from the Baseband board buzzer LCD flexi Retaining clips To remove the LCD, first unclip the retaining clips and then fold the LCD back over the buzzer. Then from under the LCD, remove the ‘mylar’ tape fitted over the ‘Ziff’ connector and flexi.
  • Page 65 Removing Board to Board shield. Screw holes clips Remove the three 1.8 x 8mm pan head screws from the board to board shield. Then lift the shield out at the angle shown. This will allow the shield to be pulled out from under the clips and out of the B-Cover assembly Removing the RF board from the B-Cover The RF board is removed in a similar way to the board to board shield.
  • Page 66 Part 3b: Assembly Fitting the Back-up battery Ensure Anti-Static strap is worn and connected to the earth bonded table Ensure Anti-Static strap is worn and connected to the earth bonded table before handling any components. before handling any components. Inspect all components for any obvious damage. Inspect all components for any obvious damage.
  • Page 67 Mounting the RF board into the B-Cover MOUNT RF BOARD INTO THE B-COVER. NOTE TWO LOCATION POINTS. MOUNT THIS END OF THE RF BOARD INTO THE B-COVER FIRST. ENGAGE THE BATTERY CONNECTOR THEN LOWER THE OTHER END OF THE BOARD...
  • Page 68 Mounting the volume switch into the B-Cover MOUNT VOLUME KEY SWITCH INTO THE B-COVER. SECTION A-B GOES INSIDE. SECTION B-C GOES OUTSIDE. THIS VIEW SHOWS THE KEYSWITCH IN PLACE.
  • Page 69 The Vibrator Assembly NOTE: THE VIBRATOR WILL BE SUPPLIED IN ITS HOLDER. BUT NOTE THE CORRECT WAY THEY FIT TOGETHER NOTE THAT THE HOLDER HAS FILLED IN CORNERS AT THIS END TO ACT AS STOPS. INSERT THE VIBRATOR INTO THE HOLDER.
  • Page 70 Mounting the vibrator assembly INSERT THE VIBRATOR ASSEMBLY INTO THE BOARD TO BOARD SHIELD. WORK FROM THIS END OF THE SHIELD. NOTE POSITION OF TAKE CARE NOT TO CUTOUT IN SHIELD. TOUCH THE GASKET MATERIAL. WHEN THE VIBRATOR IS IN PLACE DRESS THE LEADS THROUGH THE CUTOUT IN THE SHIELD.
  • Page 71 Board to Board shield into the B-Cover BEND THE WIRES DOWN THE SIDE OF THE SHIELD AND USING A LABEL STICK THE WIRES TO THE SHIELD. THEN BEND THE REMAINING WIRE UPWARDS. THIS SHOULD KEEP THE WIRES IN PLACE TO HELP EASE ASSEMBLY OF SHIELD INTO B-COVER.
  • Page 72 Fitting three 8mm screws FIT AND TIGHTEN THE THREE SCREWS TO A TORQUE OF 0.2NM. +/-0.02 TORX T6 BIT REQUIRED FOR SCREWDRIVER. FIT CENTRE SCREW FIRST.
  • Page 73 Fit I/O connector to board Push the I/O Connector onto the PCB until it locks into place. Take care not to contaminate the PCB connections by touching them.
  • Page 74 Fitting the LCD. BEFORE FITTING ENSURE THAT LCD IS FITTED WITH FLEXY SUPPORT LABEL. BEFORE FITTING ENSURE THAT LCD IS FITTED WITH FLEXY SUPPORT LABEL. OPEN THE ZIFF CONNECTOR BY PULLING OUT THE WHITE LOCKING WEDGE. TAKE THE LCD WITH THE GOLD PADS ON THE FLEXY FACING UP AND INSERT THE FLEXY INTO THE ZIF CONNECTOR.
  • Page 75 Baseband board to B-Cover Assembly TAKE THE BASE BAND BOARD AND PRESENT IT TO THE B-COVER ASSEMBLY AT AN ANGLE AS SHOWN. LOCATE THE TABS ON THE BOARD INTO THE EYES ON THE B-COVER. NOTE: NOTE: ENSURE THE ANGLE IS GREAT ENOUGH NOT TO DAMAGE ANY COMPONENTS ON THE UNDERSIDE OF THE BOARD.
  • Page 76 TAKE CARE WHEN FITTING THE BOARD THAT THE VIBRATOR WIRES ARE NOT TRAPPED AND THAT THEY ARE GUIDED THROUGH THE CUT OUT AT THE TOP OF THE BOARD. RETAINING CLIPS ENGAGE OVER BASEBAND BOARD...
  • Page 77      !"# $%& '             ...
  • Page 78 Connecting Vibrator INSERT THE CONNECTOR PINS INTO THE TWO HOLES IN THE BOARD. YOU WILL FEEL THE PIN GO INTO THE HOLES ALMOST ALL THE WAY. AT THIS POINT THE PINS ARE NOT YET ENGAGED INTO THE CONNECTOR ON THE OTHER SIDE OF THE BOARD.
  • Page 79 Fit Screen to A-Cover REMOVE THE COVER FROM THE ADHESIVE ON THE BACK OF THE WINDOW AND INSERT THE WINDOW INTO THE A-COVER. INSERT THE TAB AT THE TOP OF THE WINDOW INTO THE GAP IN THE A-COVER. NOTE: NOTE: ENSURE THE WINDOW IS FULLY PUSHED TOWARDS THE TOP OF THE PHONE BEFORE LOWERING IT INTO POSITION.
  • Page 80 Mount Keymat into A-Cover NOTE: NOTE: ENSURE ALL THE METAL PADS ARE IN PLACE ON THE BACK OF THE KEYPAD, AFTER AFTER IT IS FITTED.
  • Page 81 Mounting B-Cover Assembly into A-Cover Assembly • REMOVE ANY PROTECT SHEET FROM THE LCD. • USING COMPRESSED AIR BLOW ANY DUST FROM THE SURFACES OF THE LCD AND INSIDE FACE OF THE LCD WINDOW. CLEAN WITH A LENSE CLOTH IF REQUIRED.
  • Page 82 Insert Screws into B - Cover FIT AND TIGHTEN THE TWO SCREWS TO A TORQUE OF 0.15NM +/-0.02 TORX T6 BIT REQUIRED FOR SCREWDRIVER.
  • Page 83 Fit Antenna INSERT AND SCREW THE ANTENNA INTO THE ASSEMBLY.

  • Page 84: Troubleshooting

    << Previous Section Next Section >> Main Menu Section 5 Troubleshooting Part 1 Equipment Configurations Part 2 Engineering Function Commands Part 3 Receiver RF Levels and Checks Part 4 Transmitter RF Levels and Checks Part 5 Test Signals Part 6 Fault Codes...
  • Page 85 DB2000 mobile phone. A comprehensive range of RF readings, signals and voltage values have been recorded from key parts of the DB2000’s logic and RF circuits. These readings can then be utilised by the engineer and used as a reference guide from which they can compare these signals with one’s taken from faulty or suspect boards.
  • Page 86 Part 2: Engineering Function Commands This section describes the engineering functions which are available in the DB2000 and DB500 HHP’s and also sets out to demonstrate their use. Engineering functions are normally hidden from the operator and can only be accessed by placing the HHP in suspend mode.
  • Page 87 BATTERY Reads the voltage, charge current, temperature and Id of the battery. Function Id Number Mode Suspend / Non Suspend Parameter Range Purpose/Result Voltage 0 -255 ADC steps digital representation of the battery voltage Charge Current 0 -255 ADC steps digital representation of the Charge current Temperature...
  • Page 88 CHECK_SUM This function calculates a 32-bit Checksum of the code image. A flag will be returned to indicate if the calculated checksum matches a checksum stored in a known location at power up. The checksum will be for the whole of the software image, which does not necessarily mean the whole of the flash device.
  • Page 89 HOOKSWITCH This function allows the state of the hook-switch to be read. This has not been implemented in DB2000 and will therefore always return the open condition. Sets the LED to the specified colour or off. Function Id Number Mode...
  • Page 90 RECEIVER Allows the receiver mode to be changed. Function Id Number Mode Suspend Parameter Range Purpose/Result Receiver Mode Off = 0, Normal/Burst = 1, sets the operating mode of Continuous = 2 the receiver Frequency 0 -1023 sets the ARFCN RESET This function resets the HHP and exits test mode.
  • Page 91 Parameter Range Purpose/Result Alarm On/Off 0 = Off, 1 = On Hour 0 -23 sets the hour Minute 0 - 59 sets the minutes Second 0 - 59 sets the seconds SET_LINE This function allows any control pin of the RF stage to be modified. Function Id Number Mode Suspend...
  • Page 92 Clock-Stop Only valid if “SIM Card OK” 0 = None 1 = High Preferred 2 = High Only 3 = Low Preferred 4 = Low Only 5 = Either SIM Phase Only valid if “SIM Card OK” 0 = Phase 1 1 = Phase 1 with bits of Phase 2 2 = Phase 2...
  • Page 93 TONE This function allows a named tune to be played to a specified device. Function Id Number Mode Suspend Parameter Range Purpose/Result Tune Tune/Tone = 0, Stop = 1 Tune Number 1 = DTMF 1 2 = DTMF 2 3 = DTMF 3 4 = DTMF 4 5 = DTMF 5 6 = DTMF 6...
  • Page 94 This function allows the hardware and software version numbers to be read. Function Id Number Mode Suspend / Non Suspend Parameter Range Purpose/Result Model Number DB2000 = 6 S/W Release Number Alphanumeric string CPU S/W Version Alphanumeric string DSP S/W Version Alphanumeric string IMEI...
  • Page 95 VIBRATOR This function physically enables or disables the vibrator. Function Id Number Mode Suspend / Non Suspend Parameter Range Purpose/Result Vibrator Setting 0 - Disable 1 = Enable DISPLAY PATTERN This function displays a specified pre-defined test pattern. Function Id Number Mode Suspend Parameter...
  • Page 96 Parameter Range Purpose/Result Reason 0 - Currently processing engineering function. 1 - Invalid Parameters 2 - Not supported 3 - Incompatible version number. 4 - Incorrect Mode 5 - Invalid state 6 - General failure...
  • Page 97 Part 3 : Receiver RF Levels and Checks This section shows the typical RF levels expected throughout the receiver path and the expected control voltages for both the UHF and IF synthesisers. A block diagram showing the locations of the RF measurement points and levels is shown in figure: 3.1.
  • Page 98 Figure 3.1: Receiver Block Diagram PMB2410 RX_ON2 Control (As Fig.2.6) (10,11,12) (IC300) DB2000 Receiver RF Levels Rg=-27dbm R8=-20dbm V_G_LNA (As Fig.2.6) GSM = Ra - Ri RX I&Q PCN = R1 - R10 R10=-38dbm RINO (As Fig.3.0/3.1) R9=-32dbm Rc=-56dbm Div2...
  • Page 99 Part 3.2 : Testing the Receiver Using a suitable high frequency probe measure the RF levels at the relevant points shown in fig 3.1 and compare your measurements with those shown in the diagram. If there are any major differences between the readings taken and those indicated then further investigation of that particular point will be required.
  • Page 100 The UHF VCO and Synthesiser can be checked with the receiver set to the same setting as previously described. Obviously being a dual band product DB2000 has two UHF VCO’s, so therefore both VCO’s need to be checked. Please refer to figure 3.2: UHF VCO’s and Synthesiser, for signal levels and control voltages.
  • Page 101 Part 3.4 : The RX IF Synthesiser The IF Synthesiser can be checked with the receiver set to the same setting as previously described. Please refer to figure 3.4: The RX IF Synthesiser for the relevant control voltages and RF levels. Figure 3.4 : The RX IF Synthesiser - 19 dbm @ 180 Mhz...
  • Page 102 Part 4: Transmitter RF Levels and checks This section shows the typical RF levels expected throughout the transmitter path and the expected control voltages for both the UHF and IF synthesisers. A block diagram showing the locations of the RF measurement points is shown in figure 4.1.
  • Page 103 Figure 4.1: Transmitter Block Diagram DB2000 Transmitter RF Levels GSM = TA - TN @ Pwr Lvl 10 PCN = T1 - T15 @ Pwr Lvl 7 TG = -7dbm TE = -31dbm mech TL = -2dbm Diplexor TI = -24dbm...
  • Page 104 Part 4.2: Transmitter RF Levels and Checks Using a suitable high frequency probe measure the RF levels at the relevant points shown in fig 4.1 and compare your measurements with those shown in the diagram. If there are any major differences between the readings taken and those indicated then further investigation of that particular point will be required.
  • Page 105 Part 4.3: The TX IF Synthesiser The IF Synthesiser can be checked with the transmitter set to the same setting as previously described. Please refer to figure 4.2: The TX IF Synthesiser for the relevant control voltages and RF levels. Figure 4.2: The TX IF Synthesiser PCN : - 23 dbm @ 180 Mhz GSM : - 23 dbm @ 270 Mhz...
  • Page 106 Part 5: Test Signals Fig. 3.4 V_G_LNA Pg. 3-5I TP300 Fig.3.5 V_P_LNA Pg. 3-5J TP301 Fig.3.6 RX_ON2 Pg. 3-16G TP405...
  • Page 107 Fig. 3.7 GSM_LNA Pg. 3-3I TP419 Fig. 3.8 PCN_LNA Pg. 3-3J TP420 Fig. 4.9 TCXO Pg. 2- H11 TP413...
  • Page 108 Fig. 4.0 GSM Rx I&Q’s Pg. 3-E/F15 TP406/7 Fig.4.1 PCN Rx I & Q Pg.3-E/F15 TP406/7 Fig. 4.2 GSM_TX Pg. 1-1I TP403...
  • Page 109 Fig. 4.3 PCN_TX Pg. 1-1J TP417 Fig. 4.4 3V_G_TX Pg. 1-4I TP100 Fig. 4.5 3V_P_TX Pg. 1-4J TP101...
  • Page 110 Fig. 4.6 GSM_ON Pg. 1-2K TP402 Fig. 4.7 PCN_ON Pg. 1-1K TP415 Fig. 4.8 PRE_ON Pg. 1-4J TP416...
  • Page 111 Fig. 4.9 GSM_PRE_ON Pg. 1-3K TP102 Fig. 4.10 PCN_PRE_ON Pg. 1-4K TP103 Fig. 4.11a Tx I & Q Burst Pg.1-1E TP408/22 See Fig 4.11b...
  • Page 112      “I” “Q”   !"#$%&'()  *+,--.- !"#$%&'/...
  • Page 113 Fig. 4.14 V_ERROR PCN @ Pwr Lvl 7Pg.1-16I Fig.4.15 300khz Charge Pump Pg.1 Log-9G...
  • Page 114 Part 6: Fault Codes The DB2000 can display a number of ‘Return to Service Centre Codes’ to indicate a fault within the HHP as per the list below. Code 3 This indicates that the secure areas of memory within the HHP, such as the IMEI, have become corrupt.
  • Page 115 << Previous Section Next Section >> Main Menu Section 6 Device Device Information Information...
  • Page 116 M5-TV0443 1SS355TE-17 D2,D4 This is a surface mount high speed switching diode M5-TV0404 UDZTE-1751B ZENER DIODE This is a Surface Mount 5.1V Zener Diode...
  • Page 117 M5-TV0522 BYS10 SCHOTTKY DIODE Schottky barrier rectifying diode M5-TV0417 DA204UT106 DIODE D47, D200 This is a Silicon Epitaxial Rectifying Schottky Barrier Diode...
  • Page 118 M5-TV0525 UDZTE-1739B ZENER DIODE This is a surface mount 3.9V zener diode M5- TV0521 DAP222 DIODE D100 This is a epitaxial planar switching diode...
  • Page 119 M5-TV0514 BAR64-05 SILICON DIODE D300, D400, D401 High voltage, silicon diode, for frequencies up to 3Ghz M5-TV0519 B8Y51 SILICON DIODE D303 This is a dual tuning diode...
  • Page 120 M5-NY0445 ASIC NELL V.3 PIN DESCRIPTION FUNCTION FUNCTION FUNCTION KEYROW3 DATA4 KEYROW4 DATA5 KEYROW5 ADC_AGND1 DATA6 ILBPORT2 ADC_AIN0 DATA7 OSC32KM ADC_AIN1 PORT13 OSC32KP ADC_AIN2 PORT14 ADC_AIN3 DATA8 VDD2 ADC_AIN4 DATA9 MECHIP VREF ADC VDD2 ADC_AVDD DATA10 HARDPWR ADC_AGND2 DATA11 ILBPORT0 DAC_AGND1 PORT15 EXTSENSE...
  • Page 121 FUNCTION FUNCTION FUNCTION TEST1 TEST0 ROMCS PORT4 PORT5 TEST5 TEST4 TEST3 PORT0 PORT6 TESTT2 PORT1 PORT7 EXTINT LCDDATA PORT8 nTRST PORT9 PORT10 DATA0 PORT2 DATA1 PORT3 DATA2 DATA3 PORT1 MODE PORT2 FLASHRST...
  • Page 122 M5-TQ0442 TS951 OPERATIONAL AMPLIFIER IC13, 29, 105, 108, 109 SOT-23L (5) Vcc OUTPUT Vcc - NON-INV INV INPUT INPUT Low Power Rail to Rail Single Operational Amplifier M5-TY0003 SOT23-5 2-INPUT AND GATE IC18...
  • Page 123 M5-TY0433 ASIC MINIMOE DEVICE IC19 (32) (31) (30) (29) (28) (27) (26) (25) (24) (23) (22) (21) (20) (19) (18) (17) (10) (11) (12) (13) (14) (15) (16) Pin Configuration. Pin Configuration. NAME DESCRIPTION Ground OUT7 Regulator 7 Output. Filter Capacitor Connection OUT2 Regulator 2 Output.
  • Page 124 UVLO2OUT Under Voltage Lock Out 2 Output Microprocessor Reset Output - Power-On Reset Ground Ground CBYP External Bypass Capacitor for low noise performance ENRS Reset Enable. A logic high will prevent R2, R3, R5, R6 and R7 from being switched off by UVLO2 R2 Enable.
  • Page 125 M5-TY0005 SUPERCHIP IC27 GNDA IOBIT4 VDDA IOBIT5 VREG IOBIT6 MICIN IOBIT7 MICOUT DAIRN DAIDI DAIDO DAICK SERLE SERCK SERDA TRST SERLE2 VSSP OCTLO OCTL2 OCTL3 VDDP OCTL4 OCTL6 OCTL7 OCTL8 VPP(VDD) EXTD1...
  • Page 126 M5-TY0005 SUPERCHIP IC27 Symbol Type Description GNDA Voice band analog ground. VDDA 3V voice band analog supply. VREG O, A Voice band regulated voltage for electret condenser mic. MICIN I, A Voice band microphone input. MICOUT O, A Voice band microphone output. DAIRN I, D, PD* Voice band digital audio interface reset not.
  • Page 127 RSTB Reset bar. EXTDI I, PD* External digital input. Clears prior to each Rx buffer. Digital ground. SIO input buffer full. JTAG test clock. I, PU*** JTAG test mode select. JTAG test data output. I, PU*** JTAG test data input. VDDP PLL supply.
  • Page 128 M5-TY0428 W2013 INDIRECT QUADRATURE IC100 MODULATOR FILTA FILTB ENB/APC LO1REF LO2REF EXTERNAL FILTER LO1REF VOLTAGE POWER CONTROL W2013 BLOCK DIAGRAM LO2 LO2REF ENB/APC...
  • Page 129 M5-TY0428 W2013 INDIRECT QUADRATURE IC100 MODULATOR Symbol Description Positive Supply Voltage. For low-power/small signal subcircuit. 2, 3 FILTA, FILTB Filter. Nodes A & B for parallel resonant LC. 4, 5 I, I Differential baseband inputs. 6, 7 Q, Q Differential baseband inputs. 8, 9 LO1REF, LO1 First local Oscillator Input.
  • Page 130 M5-TY0426 Bipolar Mixer Amplifier IC101, IC102 AREF P-TSSOP16 GND1 GND1 GND1 GND2 Pin No. Symbol Function AREF Amplifier bias supply for signal input Amplifier signal base input GND1 Amplifier ground GND1 Amplifier ground Mixer signal open collector output Mixer signal open collector output, inverted Voltage supply total circuit Mixer local oscillator signal base input, inverted Mixer local oscillator signal base input...
  • Page 131 M5-TY0413 PC2771T MED POWER AMP IC103, IC104 Surface Mount Silicon Monolithic Medium Power High Frequency Amplifier M5-TQ0433 PF01411B 5W POWER AMP (GSM) IC106 Pout Vapc Usable Frequency Range ~ 880 to 915 MHz Typical Output Power ~ 34.2 dBM @ 3volts...
  • Page 132 M5-TQ0432 PF0414B 3W POWER AMP (GSM 1800) IC107 Pout Vapc Usable Frequency Range ~ 1710 to 1785 MHz Typical Output Power ~ 31.5 dBM @ 3volts...
  • Page 133 M5-TY0429 DUAL FREQUENCY SYNTHESIZER IC201 Vcc1 Vcc2 Do RF Do IF DATA Fo LD CLOCK PIN NAME PIN NAME DESCRIPTION DESCRIPTION VCC1 Input power supply voltage (2.7V -5.5V), for RF analogue/digital circuits. VCC1 must equal VCC2. Power supply for charge pump. Must be ≥ VCC. Do RF Internal charge pump output.
  • Page 134       Do IF C H A R G E 15-BIT IF P H A S E P R E S C A L E R N C O U N T E R P U M P C O M P 15-BIT IF R C O U N T E R O U T...
  • Page 135 M5-TQ0443 MQE901-1195 GSM VCO IC202 9 0 1 -1 1 9 5 GSM Voltage Controlled Oscillator DESCRIPTION OUTPUT CONTROL VOLTAGE POWER SUPPLY...
  • Page 136 M5-TQ0444 MQE920-1570 PCN VCO IC203 9 2 0 -1 5 7 0 PCN Voltage Controlled Oscillator DESCRIPTION OUTPUT CONTROL VOLTAGE POWER SUPPLY...
  • Page 137 M5-TY0427 PMB2410 GSM / PCN RECIEVER IC300 LO2O REFIQ Stand Stand by IF & OPAMP Div. by LO2OX 2 or 3 Output Buffer Output FBQX Diff. op. Sec. Mixer Q Driver REFOQ First Mixer REFOI Div by Diff. op. Output Driver LO1X Sec.
  • Page 138 M5-TY0442 DPX321880OT DIPLEXOR IC400 GSM1800 COMMON M5-TQ0426 13Mhz TCXO X200 13 Mhz TCXO (Temperature compensated crystal oscillator)
  • Page 139 M5-TV0485 NDC652P P-CHANNEL FET GATE SOURCE DRAIN DRAIN SOURCE DRAIN Surface Mount P-Channel Logic Level Enhancement Mode FET M5-TV0470 UMX1NTR NPN TRANSISTOR TR4, 28, 32 Surface Mount NPN Silicon Epitaxial Planar Transistor Pack...
  • Page 140 M5-TV0466 2SC2411KT146 TRANSISTOR TR11, 12, 29, 108, 109 EMITTER BASE COLLECTOR Surface Mount NPN Silicon Epitaxial Planar Transistor M5-TV0487 2SJ203-T2B P-CHANNEL MOSFET TR25, 301 ,302 SOURCE GATE DRAIN Surface Mount P-Channel Mosfet Switch...
  • Page 141 M5-TV0454 2SJ204 P-CHANNEL MOSFET TR100, 201, 202, 203 SOURCE GATE DRAIN GATE SOURCE DRAIN Surface Mount P-Channel MOSFET with Parasitic Drain-Source Diode M5-TV0516 SI2301DS P-CHANNEL MOSFET TR101, 102, 103, 104, 105 Surface Mount P-Channel MOSFET...
  • Page 142 M5-TV0518 BFP405 RF TRANSISTOR TR106, 300 Emitter Collector Emitter Base This is a surface mount NPN Silicon RF Transistor. M5-TV0517 MRF1047T NPN TRANSISTOR TR107, 205 Base Emitter Collector Surface Mount NPN Transistor...
  • Page 143 M5-TV0403 UMC4 TRANSISTOR SW PACKAGE TR110, 111 This is a Dual Surface Mount Silicon Epitaxial Planar Transistor Package (C4) Marking...
  • Page 144 M5-TV0501 2SC4180-T1 NPN TRANSISTOR TR200, TR204 Base Emitter Collector Surface Mount NPN Epitaxial Planar Transistor...
  • Page 145 << Previous Section Next Section >> Main Menu Section 7 Parts Part 1 Exploded View Part 2 Assembly Parts Part 3 Baseband Board Parts Part 4 RF Board Parts...
  • Page 146 EXPLODED VIEW OF DB2000 Item Item Description Description Stock No. Stock No. Retractable Antenna M5-NE0402-0A B Cover M5-N50498-0A A Cover Various Keymat Assembly M5-N50490-0A Volume Keymat M5-N50491-0A Coaxial Switch Connector M5-NJ0439 IO Connector M5-NJ0432-0A Lightguide M5-ND0425-0A LCD Assy M5-NP0409-0A Window Assembly...
  • Page 147 DB2000 Assembly Parts List Stock Number Description Part Number M5-N50314-0A G4H WINDOW ASSEMBLY 144-619446 M5-N50450-0A G4H LATCH BATT PACK 144-619357 M5-N50453-0A G4H VIBRATOR HOLDER 144-619390 M5-N50483 JUNO SIM MODULE MRD-JMU-0027-01 M5-N50490-0A G4H KEYMAT ASSEMBLY 144-619368 M5-N50023-0A A COVER ASSEMBLY (Standard)
  • Page 148 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number M5-ND0423 MB17A, Buzzer Magnetic 13x10.6 Primo (SM), P0, M5-ND0423 MRD-SPK-0011-01 BATT1 M5-NB0496 KE95.00, Vanadium Lithium 3v Rechargeable Battery, E1, M5-NB0496 MRD-BAT-0001-02 M5-TC3168 100n, Capacitor 6.3V 10% X5R 0402, P0, M5-TC3168...
  • Page 149 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number C100 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044 MRD-CAP-0805-19 C101 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044 MRD-CAP-0805-19 C107 M5-TC3030 1n, Capacitor 50V 5% X7R 0402, P0, M5-TC3030...
  • Page 150 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number C208 M5-TC3180 100n, Capacitor 6.3V 10% X5R 0402, P0, M5-TC3180 MRD-CAP-0496-16 C211 M5-TC3042 10n, Capacitor 50V 5% X7R 0402, P0, M5-TC3042 MRD-CAP-0807-25 C212 M5-TC3042 10n, Capacitor 50V 5% X7R 0402, P0, M5-TC3042...
  • Page 151 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number C258 M5-TC3181 100n, Capacitor 6.3V 10% X5R 0402, P0, M5-TC3181 MRD-CAP-0496-17 C262 M5-TC3182 100n, Capacitor 6.3V 10% X5R 0402, P0, M5-TC3182 MRD-CAP-0496-18 C263 M5-TC0459 100n, Capacitor 16V 10% X7R 0603, P0, M5-TC0459...
  • Page 152 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number C299 M5-TC2053 220p, Capacitor 50V 5% COG 0402, P0, M5-TC2053 MRD-CAP-0805-29 C300 M5-TC3042 10n, Capacitor 50V 5% X7R 0402, P0, M5-TC3042 MRD-CAP-0807-25 C301 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044...
  • Page 153 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number M5-TY0002 KM616FS1010Z-15, RAM, P0, M5-TY0002 MRD-URU-0010-01 IC10 M5-TY0006 M24C32-W, EEPROM 2.5-5.5V 32K CMOS, P0, M5-TY0006 MRD-URE-0003-02 IC13 M5-TQ0442 TS951, Rail-Rail Single Op-Amp Low Power, P0, M5-TQ0442 MRD-UAN-0051-01 IC15 M5-TY0438...
  • Page 154 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number M5-TR0930 10k, Resistor 1/16W 1% 0402, P0, M5-TR0930 MRD-RES-0095-01 M5-TR0930 10k, Resistor 1/16W 1% 0402, P0, M5-TR0930 MRD-RES-0095-01 M5-TR0947 15k, Resistor 1/16W 1% 0402, P0, M5-TR0947 MRD-RES-0095-18 M5-TR0930 10k, Resistor 1/16W 1% 0402, P0, M5-TR0930...
  • Page 155 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number R157 M5-TR0834 1k, Resistor 1/16W 1% 0402, P0, M5-TR0834 MRD-RES-0094-01 R158 M5-TR1450 3k, Resistor 1/16W 1% 0402, P0, M5-TR1450 MRD-RES-0105-65 R161 M5-TR0834 1k, Resistor 1/16W 1% 0402, P0, M5-TR0834...
  • Page 156 DB2000 Baseband Parts List Circuit Ref. Stock Number Description Part Number R212 M5-TR0930 10k, Resistor 1/16W 1% 0402, P0, M5-TR0930 MRD-RES-0095-01 R213 M5-TR0930 10k, Resistor 1/16W 1% 0402, P0, M5-TR0930 MRD-RES-0095-01 R215 M5-TR1438 560R, Resistor 1/16W 1% 0402, P0, M5-TR1438...
  • Page 157 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C100 M5-TC1156 100p, Capacitor 16V 5% COG 0402, P0, M5-TC1156 MRD-CAP-0822-25 C101 M5-TC1156 100p, Capacitor 16V 5% COG 0402, P0, M5-TC1156 MRD-CAP-0822-25 C102 M5-TC2835 10n, Capacitor 16V 10% X7R 0402, P0, M5-TC2835...
  • Page 158 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C133 M5-TC1134 1p5, Capacitor 16V 5% COG 0402, P0, M5-TC1134 MRD-CAP-0822-03 C133 M5-TC1134 1p5, Capacitor 16V 5% COG 0402, P0, M5-TC1134 MRD-CAP-0822-03 C134 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044...
  • Page 159 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C161 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044 MRD-CAP-0805-19 C163 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044 MRD-CAP-0805-19 C165 M5-TC2835 10n, Capacitor 16V 10% X7R 0402, P0, M5-TC2835...
  • Page 160 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C210 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044 MRD-CAP-0805-19 C211 M5-TC2835 10n, Capacitor 16V 10% X7R 0402, P0, M5-TC2835 MRD-CAP-0837-25 C212 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044...
  • Page 161 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C240 M5-TC2823 1n, Capacitor 16V 10% X7R 0402, P0, M5-TC2823 MRD-CAP-0837-13 C241 M5-TC2823 1n, Capacitor 16V 10% X7R 0402, P0, M5-TC2823 MRD-CAP-0837-13 C242 M5-TC2823 1n, Capacitor 16V 10% X7R 0402, P0, M5-TC2823...
  • Page 162 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C317 M5-TC0510 56p, Capacitor 50V 5% COG 0402, P0, M5-TC0510 MRD-CAP-0805-22 C318 M5-TC0510 56p, Capacitor 50V 5% COG 0402, P0, M5-TC0510 MRD-CAP-0805-22 C320 M5-TC0510 56p, Capacitor 50V 5% COG 0402, P0, M5-TC0510...
  • Page 163 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number C350 M5-TC3179 4p, Capacitor 16V +/-0.25p COG 0402, P0, M5-TC3179 MRD-CAP-0822-37 C351 M5-TC2044 33p, Capacitor 50V 5% COG 0402, P0, M5-TC2044 MRD-CAP-0805-19 C352 M5-TC3180 7p, Capacitor 16V +/-0.5p COG 0402, P0, M5-TC3180...
  • Page 164 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number FL105 M5-TF0415 DGL612M01, RF Filter Low Loss 1747.5MHz, P0, M5-TF0415 MRD-FSW-0019-01 FL300 M5-TF0423 L672B, Low Loss Filter 1842.5MHz PCN, P0, M5-TF0423 MRD-FSW-0015-02 FL301 M5-TF0412 MFL1842CBL01, Dielectric Filter 1842.5MHz, P0, M5-TF0412...
  • Page 165 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number L109 M5-TL0010 39nH, Inductor 5% High Q Multilayer 0603, P0, M5-TL0010 MRD-LLF-0095-19 L110 M5-TL0422 330nH, Inductor 10% 145MHz Self Res Freq 0805, P0, M5-TL0422 MRD-LLF-0019-23 L111 M5-TL0422 330nH, Inductor 10% 145MHz Self Res Freq 0805, P0, M5-TL0422...
  • Page 166 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number L305 M5-TT0402 LDB25D500A0004, Dual Balun GSM900/DCS1800, P0, M5-TT0402 MRD-THF-0002-01 L306 M5-TL0462 100nH, Inductor 5% High Q Multilayer 0603, P0, M5-TL0462 MRD-LLF-0075-24 L307 M5-TL0511 56nH, Inductor 5% High Q Multilayer 0603, P0, M5-TL0511...
  • Page 167 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number R108 M5-TR0755 150R, Resistor 1/16W 1% 0402, P0, M5-TR0755 MRD-RES-0093-18 R109 M5-TR0755 150R, Resistor 1/16W 1% 0402, P0, M5-TR0755 MRD-RES-0093-18 R110 M5-TR1465 18k, Resistor 1/16W 1% 0402, P0, M5-TR1465...
  • Page 168 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number R144 M5-TR1522 0R047, Resistor 1/16W 1% 0805, P0, M5-TR1522 MRD-RES-0046-02 R145 M5-TR1494 510k, Resistor 1/16W 1% 0402, P0, M5-TR1494 MRD-RES-0106-10 R146 M5-TR1474 47k, Resistor 1/16W 1% 0402, P0, M5-TR1474...
  • Page 169 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number R300 M5-TR1468 27k, Resistor 1/16W 1% 0402, P0, M5-TR1468 MRD-RES-0105-83 R301 M5-TR1430 270R, Resistor 1/16W 1% 0402, P0, M5-TR1430 MRD-RES-0105-45 R302 M5-TR1440 680R, Resistor 1/16W 1% 0402, P0, M5-TR1440...
  • Page 170 DB2000 RF Board Parts List Circuit Ref Stock Number. Description Part Number TR109 M5-TV0446 2SK1581, N-Channel Mosfet With Diode, P0, M5-TV0446 MRD-QBL-0023-01 TR110 M5-TV0403 UMC4, Dual Digital Planar Transistor 150mW, P0, M5-TV0403 MRD-QBL-0003-01 TR111 M5-TV0403 UMC4, Dual Digital Planar Transistor 150mW, P0, M5-TV0403...
  • Page 171 << Previous Section Next Section >> Main Menu Section 8 Circuit Diagrams and Board Maps Part 1 Baseband Circuit Diagrams Part 2 RF Circuit Diagrams Part 3 Baseband Board Maps Part 4 RF Board Maps...
  • Page 190 << Previous Section Next Section >> Main Menu Glossary of Terms...
  • Page 191 List of General Acronyms and Abbreviations List of General Acronyms and Abbreviations This section provides a list of acronyms and abbreviations used in this manual and generally in GSM. Ampere Alternating Current AD, A/D AD, A/D Analogue to Digital Converter Adjust, Adjustment Audio Frequency Automatic Frequency Control...
  • Page 192 Collector terminal on a Transistor Capacitor, Centigrade Calibrate, Calibration Capacitor CCCH CCCH Common control Channel CCITT CCITT International Consultative Committee for Telegraphy and Telephony Cadmium Channel Charge Clock CMOS CMOS Clear CO-AX CO-AX Complimentary Metal Oxide Semiconductor CODEC CODEC Coaxial Cable Encoder and Decoder CONT CONT...
  • Page 193 PROM PROM Electrically Erasable and Programmable Read Only Memory Expander External, Extension Farad FACCH FACCH Fast Associated Control Channel Frequency Control Channel Function FDMA FDMA Frequency Division Multiple access Field Effect Transistor Filter Frequency Modulation FREQ FREQ Frequency Frequency Shift Keying GMSK GMSK Gaussian Minimum Shift Keying...
  • Page 194 Light Emitting Diode Low Noise Amplifier Local Oscillator Large Scale Integrated Circuit Maximum Mega Hertz Microphone Middle Minimum Mixer Modulate, Modulator MODEM MODEM Modulator and Demodulator Monitor Mobile Station Mobile switching centre Minimum Shift Keying Mobile Subscriber set Multiplexer No Connection No Good NiCd NiCd...
  • Page 195 Quadrature Phase Signal Quantity QPSK QPSK Quadrature phase Shift Keying Resistor RACH RACH Random Access Channel Random Access Memory Recall Receiver, Earpiece Reference Resistor Radio Frequency Read only Memory RSSI RSSI Receive Signal Strength Indication Reset Receive, Receiver RXAF RXAF Receive Audio Frequency RXLev RXLev...
  • Page 196 TCXO TCXO Temperature Controlled Oscillator TDMA TDMA Time Division Multiple Access Test Equipment TEMP TEMP Temperature A type of connector Test Point Transistor Transmitter and Receiver TX TX Transmit, Transmitter TXAF TXAF Transmit Audio Frequency Micro Micro Farad Ultra High Frequency Microprocessor Volts Voltage Controlled Oscillator...
  • Page 197 Points of Contact for further Information. NEC Deutschland Gmbh. Steinheilstr 4-6 85737 Ismaning Deutschland Tel: +49 89 962 740 NEC France SA 56 Rue De Hauntes Patures 92024 Nanterre Cedex France Tel: +33 1 4649 4649 NEC Iberica SA Miniparc 1...
  • Page 198 DB2000 Service Manual Guide. DB2000 Service Manual Guide. All sections of the service manual can be accessed from the keypad of the DB2000 on this page of the manual. For instance, clicking the number ‘3’ on the keypad will take you to section 3 of the manual. Moving the mouse over each of the numeric keys will show the title of the related section on the DB2000 display.
  • Page 199 Revision 1.1 - 27 January 1999 NEC Technologies (UK) Ltd. This Document is the property of NEC Technologies (UK) Ltd. It must not be reproduced, in whole or in part, or otherwise disclosed without prior consent in writing from NEC Technologies (UK) Ltd.