Samsung SGH-E820, Service Manual

Page 1: ... SERVICE Manual GSM TELEPHONE CONTENTS 1 Specification 2 Circuit Description 3 Exploded Views and Parts List 4 Electrical Parts List 5 Block Diagrams 6 PCB Diagrams 7 Flow Chart of Troubleshooting GSM TELEPHONE ...

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd June 2004 Printed in Korea Code No GH68 05551A BASIC ⓒ ...

Page 3: ...0 880 915 925 960 1710 1785 1805 1880 ARFCN range 1 124 0 124 975 1023 512 885 Tx Rx spacing 45MHz 45MHz 95MHz Mod Bit rate Bit Period 270 833kbps 3 692us 270 833kbps 3 692us 270 833kbps 3 692us Time Slot Period Frame Period 576 9us 4 615ms 576 9us 4 615ms 576 9us 4 615ms Modulation 0 3GMSK 0 3GMSK 0 3GMSK MS Power 33dBm 5dBm 33dBm 5dBm 30dBm 0dBm Power Class 5pcl 19pcl 5pcl 19pcl 0pcl 15pcl Sensi...

Page 4: ...S1800 0 30 3 dBm 1 28 3 dBm 2 26 3 dBm 3 24 3 dBm 4 22 3 dBm 5 20 3 dBm 6 18 3 dBm 7 16 3 dBm 8 14 3 dBm 9 12 4 dBm 10 10 4 dBm 11 8 4dBm 12 6 4 dBm 13 4 4 dBm 14 2 5 dBm 15 0 5 dBm TX Power control level GSM900 5 33 3 dBm 6 31 3 dBm 7 29 3 dBm 8 27 3 dBm 9 25 3 dBm 10 23 3 dBm 11 21 3 dBm 12 19 3 dBm 13 17 3 dBm 14 15 3 dBm 15 13 3 dBm 16 11 5 dBm 17 9 5 dBm 18 7 5 dBm 19 5 5 dBm ...

Page 5: ...ver front end which amplifies the GSM DCS aerial signal converts the chosen channel down to a low IF signal of 100 kHz The first stage is composed of symmetrical low noise amplifiers LNAs They are matched to 50 ohm The LNAs are followed by an IQ down mixer It consists of two mixers in parallel but driven by quadrature out of phase LO signals The In phase I and Quadrature phase Q IF signals are low...

Page 6: ...ent battery energy or excessive die temperature 1 2 Backlight Brightness Modulator The Backlight Brightness Modulator BBM contains a programmable Pulse width modulator PWM and FET to modulate the intensity of a series of LED s or to control a DC DC converter that drives LCD backlight This phone SGH E820 use PWM control to contrast the backlight brigtness 1 3 Clock Generator The Clock Generator CG ...

Page 7: ... IC and supply current to battery When fault condition caused CHG_ON signal level change low to high and charger IC stop charging process 8 Audio EARP_P and EARP_N from OM6359 are connected to the main speaker AUXSP is connected to the Hands free kit MIC_P and MIC_N are connected to the main MIC And AUX_MIC_P and AUX_MIC_N are connected to earmicrophone YMU765_MA5 is a LSI for portable telephone t...

Page 8: ...emory and SCRAM Reading or writing procedure is processed after HWR_N or HRD_N is enabled Memories use reset which is VDD3 delay from PCF50601 HA 25 signal enables lower byte of SRAM and HA 26 signal enables higher byte of SRAM 10 OM6359 OM6359 is consisted of ARM core and DSP core It has 8x1Kword on chip program data RAM 55 Kwords on chip program ROM in the DSP It has 4K 32bits ROM and 2K 32bits ...

Page 9: ...r It also allows to have various kinds of display size on the LCD and snapshot for Jpeg Digital effect will also be executed on real time base resulting Tiger as being a video co processor in the mobile platform Also an i80 type processor s 16bit parallel interface of Tiger makes it available for the CPU to interchange the data with Tiger As the additional 8Mbit is usable except 2Mbit buffer embed...

Page 10: ...ts Parts list 3 1 This Document can not be used without Samsung s authorization 1 Cellular phone Exploded View 1 QAN02 QCA02 QMP01 QAN03 QME01 QVK01 QIF02 QMI01 QRF05 QCR06 QVO03 QCK02 QRE01 QBA18 QCH01 QSC11 QFL01 QPC01 QMP02 QKP01 QFR01 QCR05 QME02 QLC40 QSP01 QKP03 QMO02 QCA01 QFU01 ...

Page 11: ...2 METAL DOME SHEET GH59 01312A QFL01 SLIDE LOWER ASSY GH75 04453A QCR05 SCREW 6001 001478 QSC11 LOWER SCREW CAP GH73 03014A QCH01 CAMERA DUMMY ASSY GH75 04881A QFR01 FRONT COVER GH75 04450A QKP01 MAIN KEYPAD GH75 04455A QAN02 INTENNA ASSY GH42 00396A QAN03 INTENNA GND PLATE GH42 00396B QVK01 UNIT SIDE KEY GH59 01308A QMP01 MAIN PBA GH92 01807A QCA02 UNIT CAMERA KEY GH59 01313A QME01 METAL DOME SHE...

Page 12: ...loded view and its Part list 3 3 This Document can not be used without Samsung s authorization 3 Test Jig GH80 01909A 3 1 RF Test Cable GH39 00283A 3 2 Test Cable GH39 00217A 3 3 Serial Cable 3 4 Power Supply Cable 3 5 DATA CABLE GH39 00219A 3 6 TA GH44 00482A ...

Page 13: ...75 U101 1202 001068 U201 1203 001895 U501 1203 001917 U206 1203 002980 U204 1204 002138 U304 1205 002327 U102 1205 002350 U400 1404 001221 TH201 1405 001093 TH300 1405 001093 TH301 1405 001093 TH302 1405 001082 V200 2007 000138 R127 2007 000140 R131 2007 000140 R132 2007 000140 R201 2007 000140 R203 2007 000140 R214 2007 000140 R223 2007 000140 R226 2007 000140 R311 2007 000141 R104 2007 000141 R2...

Page 14: ...17 2007 001308 R125 2007 001313 R322 2007 001325 R326 2007 001329 R105 2007 001339 R238 2007 001339 R239 2007 002796 R200 2007 002796 R205 2007 002796 R217 2007 002796 R227 2007 007001 R224 2007 007014 R321 2007 007014 R323 2007 007100 R402 2007 007107 R211 2007 007107 R212 2007 007107 R213 2007 007107 R216 2007 007132 R329 2007 007136 R327 2007 007142 R215 2007 007142 R218 2007 007148 R103 2007 0...

Page 15: ...34 2203 000679 C238 2203 000679 C309 2203 000679 C429 2203 000812 C104 2203 000812 C215 2203 000854 C100 2203 000854 C105 2203 000854 C106 2203 000854 C236 2203 000885 C415 2203 001153 C140 2203 001383 C112 2203 001405 C319 2203 002443 C310 2203 002687 C318 2203 005053 C111 2203 005056 C227 2203 005056 C228 2203 005057 C107 2203 005057 C109 2203 005057 C116 2203 005057 C125 2203 005057 C145 2203 0...

Page 16: ...2203 006190 C132 2203 006208 C400 2203 006208 C402 2203 006208 C406 2203 006208 C413 2203 006208 C416 2203 006208 C417 2203 006208 C424 2203 006208 C428 2203 006208 C431 2203 006208 C432 2203 006257 C320 2203 006257 C412 2203 006257 C425 2203 006257 C426 2203 006257 C427 2203 006361 C241 2301 001197 C120 2301 001213 C118 2404 001105 C243 2404 001225 C405 2404 001225 C421 2404 001225 C422 2404 0012...

Page 17: ...203 ZD507 0406 001203 ZD508 0406 001203 ZD509 0406 001203 ZD510 0406 001203 ZD511 0406 001203 ZD512 0406 001203 ZD513 0504 001100 U305 SUB SEC CODE Design LOC 0402 001617 D608 0402 001617 D609 0403 001446 ZD600 0601 001819 D600 0601 001819 D601 0601 001819 D602 0601 001819 D603 1003 001440 Q600 1203 001895 U603 1203 001917 U600 1203 002862 U604 1203 003328 U601 1209 001555 U602 1405 001082 V600 14...

Page 18: ...his Document can not be used without Samsung s authorization 2203 005065 C613 2203 005065 C614 2203 005482 C601 2203 005482 C602 2203 005482 C612 2203 005840 C616 2404 001086 C605 2404 001101 C604 2703 002714 L600 3708 001853 CN601 3708 001890 CN600 4715 001077 D610 3711 005661 CN602 ...

Page 19: ... 1 6 dB 1805 1880 0 97 dB Atten 2xfo 43dB 26dB GSM DCS 3xfo 40dB 20dB GSM DCS EN CLK DATA DCS S W OFFSET Mixer input power 16dBm max 22dBm min fcompRF 26MHz Philips Transceiver UAA3536 Pins IA IB QA and QB VIQ 1 25Vtyp 1 15Vmin 1 35Vmax Vmod 0 5Vpp QUAD DIV PFD CP VREG Vcc_RF_LO FracN DIV 1 1 2 VREG 26MHz Vcc_REF 2 4V typ Vcc_SYN FESW1 FESW2 3W BUS CTL REG PWR EN GSM DCS PCS DIV QUAD PFD CP fTXIF ...

Page 20: ...A MV317SAQ FLASH NOR 128M bit NAND 256M bit SRAM 64M bit LCD KEY_PAD Battery Type Battery Voltage Battery Temperature VCC_CP VCC_SYN VCC_RX_TX VCC_RF_VCO VCC_TX_BURST VDD1 VDD2 VDD3 VDD_KEY MIC_BIAS VIBVDD SENSOR_VDD MV317_VDD LCD_VDD AVDD_TEMP AVDD OM6359 Serial Data Interface I O Interface A D Interface AFC RAMP MIC SPK PMU RTC_CLOCK 32 768Khz SIMCARD LI ION Battery Standard Charging Circuit RF ...

Page 21: ...SAMSUNG Proprietary Contents may change without notice 6 SGH E820 PCB Diagrams 6 1 This Document can not be used without Samsung s authorization 1 Main PCB Top Diagram ...

Page 22: ...SAMSUNG Proprietary Contents may change without notice PCB Diagrams 6 2 This Document can not be used without Samsung s authorization 2 Main PCB Bottom Diagram ...

Page 23: ...SAMSUNG Proprietary Contents may change without notice PCB Diagrams 6 3 This Document can not be used without Samsung s authorization 3 Sub PCB Top Diagram ...

Page 24: ...SAMSUNG Proprietary Contents may change without notice PCB Diagrams 6 4 This Document can not be used without Samsung s authorization 4 Sub PCB Bottom Diagram ...

Page 25: ...ore than 3 4V Power On does not work Change the Battery END No Yes C412 V_ISUP 2 7V Check the PMU related to V_ISUP No Yes Check the Clock at R402 32KHZ Resolder X400 No Yes C433 VDD1 H Check the VDD1 circuit No Yes C432 VDD2 C431 VDD3 2 8V Check the VDD2 VDD3 circuit No Yes Check for the clock at C139 13MHz Check the clock generation circuit related to OSC101 No Yes Check the initial operation Ye...

Page 26: ...SCP B1 SIMVBAT B2 SLPMOD D10 TM H5 J5 VBACK VBAT K4 VCC RST D9 RSTO SCL E3 SDA F2 SEL12RB E9 SEL3RB H4 SIMCLK C6 SIMGND A2 B8 RF1SWS RF1VDD G10 RF1VDDS F9 RF2SNS H9 RF2SWS E10 RF2VDD H10 RF2VDDS J10 RFVBAT G9 C1 OSC32I K9 OSC32O REC1 K1 REC2 J2 REC3 K2 REFC H8 REFGND K6 RF1SNS F10 E8 C10 IN T IO D2 ISUPA H6 ISUPD J4 MICBIAS J6 NC 1 NC 2 H3 ONKEY K8 HFAVD D HFAVD D B6 HVSGND B9 HVSOC B10 HVSSCN A10...

Page 27: ...hart of Troubleshooting This Document can not be used without Samsung s authorization 7 3 2 Initial R207 RSTON H Initial Failure Check the circuit related to reset END No Yes Is U300 pin 4 6 memory CE OK Yes Yes No Check the U300 Check the circuit around LCD Yes ...

Page 28: ...C K6 NC 1 C7 R _BN R _BR C2 C5 VCCN L5 VCCN VCCQ U J4 L4 VCCR NC C4 D4 NC 2 NC NC E4 NC G8 H4 NC NC H6 K4 NC J2 DQ2 DQ3 K3 L6 DQ4 DQ5 J7 DQ6 L7 K8 DQ7 DQ8 K1 K2 DQ9 L1 DQ0 DQ1 L2 DQ10 L3 J3 DQ11 DQ12 J6 K7 DQ13 DQ14 J8 L8 DQ15 A 1 A1 DNU DNU B1 A8 DNU DNU B8 M1 DNU DNU N1 M8 DNU DNU N8 A4 E1 A5 D1 C1 A6 F3 A7 A8 G7 D7 A9 D3 AL E CL E C3 A16 H8 E2 A17 A18 D2 F6 A19 G2 A2 A20 E6 G6 A21 F1 A3 A0 H1 A...

Page 29: ... Samsung s authorization 7 5 3 Charging Part Check the U204 pin 4 4 9V Abnormal charging part END No Yes U204 pin 1 H No Yes Q201 pin 1 CHG_ON L No Yes Check the U204 pin 3 4 2V No Yes Check the circuit related to V_EXT_CHARGE Resolder or replace U204 Check the circuit related to CHG_ON signal Resolder or replace U204 Yes ...

Page 30: ...ooting 7 6 D2 3 G1 2 G2 5 1 S1 S2 4 FDG6301N Q202 6 D1 47K R231 R236 270K R235 1 8K 1 VDD2 180K R238 270K R237 180K R239 VBAT V_EXT_CHARGE UDZS8 2B ZD202 R233 330K 1 100NF C243 6 3V 10UF C242 C241 10UF 10V C240 100N F BAT 3 2 GND PROG 5 4 VCC 1 _CHRG LTC4054ES5 4 2 U204 Q201 1 3 2 BCR133T 200K 1 R234 MES_BATT END_OF_CHARGE CHG_ON CHARGER_OK ...

Page 31: ... used without Samsung s authorization 7 7 4 Sim Part CN400 pin 1 5 H Phone can t access SIM Card Check the sim charge pump Check the SIM Card END No Yes Yes Yes No Check the X400 After Power ON Check SIMCLK Signal on CN400 pin3 in a few second Yes No Replace PBA After SIM card insert CN400 pin 2 H SIM_RST Yes ...

Page 32: ... INTERFACE SI M SIM_RST Baseband power suppl PUM P CLOCK CHARGE SIM_VCC SIM_IO SIM_CLK SI M GENERATO R INTERRUPT 4 7UF C400 C2 SIMIO SIMSCN A1 SIMSCP B1 SIMVBAT B2 VCC RST SIMCLK C6 SIMGND A2 B8 C1 C10 IN T IO D2 C3 CPRES D1 CLK VBAT 100NF C404 100NF C403 G 9 10 G 1 1 22 3 34 4 55 6 6 G 7 8 G PC D6 A6 H2 9 S CN400 C402 6 3V C401 4 7UF 100NF SIMIO SIMCLK ...

Page 33: ...e used without Samsung s authorization 7 9 5 Microphone Part Check the connection from MIC Check the circuit from U200 to MIC Resolder MIC Resolder the R200 R201 R203 R207 C211 and C218 END No Yes Yes Yes Yes No Check U200 PIN 1 9 L No Replace PBA Microphone does not work Yes Check the MIC No Replace the MIC ...

Page 34: ...1IN 2 1S1 4 1S2 9 2IN 2S1 10 2S2 12 U200 C215 33PF R203 1K MIC201 MIC_PAD 100NF C218 R202 10K 100NF C211 NC C210 C214 15PF C217 10PF 8 2PF C216 100UF 4V C213 C212 100NF C209 NC NC C208 510 R205 R201 1K MIC_BIAS C220 NC C221 NC C219 NC 100NF C200 AVDD R200 510 MIC MIC_P MIC_N AUDIO_SW3 AUDIO_SW 3 AUX_MIC 3 9K R224 VDD1 D10 MCLK MICN B13 A13 MICP B11 BUZ AUXMICN A14 B14 AUXMICP B8 A8 ADI AFS B9 DCL ...

Page 35: ...s not work Check the Clock signal at Pin 1 of U304 13MHz Check the clock generation circuit related to OSC101and U304 No Yes No Resolder or replace U303 Yes U304 pin 17 18 1 8V When U304 operate Resolder U304 No Yes No END CN601 pin 2 4 1 8V When U303 operate Change the board to board FPCB Is Speaker working Change the Speaker No Yes Yes Yes CN502 pin 48 50 1 8V When U304 operate Resolder CN502 No...

Page 36: ...C313 6 3V 33UF C316 15K 1 R32 9 C315 47NF C314 100NF C317 100NF C318 1 2N F 3 3K R326 33K R328 VBAT R324 22K 1 9 VRE F VS S 8 C S 29 3 IRQ R D 31 RST 4 28 W R 19 MTR 5 NC PLLC 6 17 SPOUT1 SPOUT2 18 15 SPVD D SPVS S 16 7 VDD 33 G G 34 35 G G 36 HPOUT L MONO 10 11 HPOUT R IOVDD 32 LED 2 24 23 D4 D5 22 21 D6 D7 20 EQ 1 12 13 EQ 2 EQ 3 14 YMU765 30 A0 1 CLKI D0 27 26 D1 25 D2 D3 VDD3 U304 51K R32 3 R3...

Page 37: ...ting This Document can not be used without Samsung s authorization 7 13 7 Key Data Input When one of the keys is pushed is it displayed on LCD Check the Dome sheet Key Pad END No Yes Yes Check Initial Operation When one of the keys is pushed KBIO signal is OK Replace the PBA No Yes ...

Page 38: ...14 SHARP 12 DIGIT1 12 1 2 3 4 5 NZQA5V6XV5T 1 ZD303 DIGIT9 12 DIGIT6 12 12 DIGIT2 12 DIGIT5 12 DIGIT3 DIGIT10 12 DIGIT8 12 DIGIT7 12 DIGIT4 12 STA R 12 KBIO 0 KBIO 1 KBIO 2 KBIO 3 KBIO 4 KBIO 5 KBIO 6 KBIO 7 KBIO 0 7 2 SOFT1 12 SEND 1 CLR 12 SOFT2 12 RIGHT 12 UP 12 12 LEFT EN D 1 2 DOW N 12 12 INT KBIO 2 6 KBIO 2 KBIO 3 KBIO 4 KBIO 5 KBIO 6 ONKEY_N ...

Page 39: ...1 5V Resolder R219 R220 END No Yes Yes Receiver does not work SPK PAD 1 5V Change the SUB board No Yes Is Receiver working Replace the Receiver No Yes No Resolder or replace U202 Yes No Resolder CN502 CN502 pin 48 50 1 5V Yes CN502 pin 2 4 1 5V No Change the board to board FPCB Yes Check the soldering of the spaeaker wire No Modify the speaker wire soldering Yes U202 pin 9 13 1 5V ...

Page 40: ... 4I N 10 3S1 7 U202 STG3699 100NF C231 SPVDD REC_P AUDIO_SW1 SPK_N REC_N SPK_P AMP_N AUDIO_SW2 AMP_P DU 4 7 R219 100K 1 NCP15WB473J04RC TH201 3 9K R224 R216 100K 1 10K 1 R215 VDD1 10K 1 R218 D10 MCLK MICN B13 A13 MICP J14 IN IP A11 EARN EARP B10 BOEN G11 B11 BUZ AUXMICN A14 B14 AUXMICP AUXSP A10 B8 A8 ADI ADO A9 AFS B9 F14 AUXADC1 AUXADC2 G14 E14 AUXADC3 F13 AUXADC4 ACLK DCL DD FSC R220 4 7 REC_N ...

Page 41: ...thout Samsung s authorization 7 17 9 Back Light for Color Main LCD Is LCD Contrast set on high level in the Menu Set LCD Contrast on high level END No Yes Yes Backlight does not work CN601 pin 5 H Change the board to board FPCB No Yes U601 PIN 1 12V Check the U601 the related circuit No Yes Yes Replace the LCD Module ...

Page 42: ...This Document can not be used without Samsung s authorization Flow Chart of Troubleshooting 7 18 L600 LQH2MCN220K02L 22uH ZD600 UDZSTE 1716B 12 R607 1K R614 4 CTRL FB 3 2 GND 6 SW VIN 5 VOUT 1 1UF LT3465 U601 C604 16V C605 4 7UF 6 3V LED LED VBAT BACKLIGHT ...

Page 43: ...s authorization 7 19 10 Key Back Light 1 Main Key Part 2 Sub Key Part U502 PIN46 H Check the U502 or Replace PBA END No Yes Yes Sub Key Backlight does not work U600 pin 4 H No Check the U600 Yes C430 H Check the PMU related to VDD_KEY END No Yes Yes Main Key Backlight does not work CN601 PIN6 H Change the board to board FPCB No Yes ...

Page 44: ...t of Troubleshooting 7 20 D300 AOT 0603P W03 X R317 D305 47 47 R31 6 47 R31 4 47 R315 47 R313 R312 47 D304 D302 D303 D301 VDD_KE Y OUT VBAT MIC5213 3 3BC5 1 EN GND 3 5 IN 2 NC 4 U600 47 D600 AOT 0603P W03 X R602 R604 47 47 R603 D602 AOT 0603P W03 X AOT 0603P W03 X D601 R605 470NF C600 AOT 0603P W03 X D603 47 SUB_KEY_BACKLIGHT ...

Page 45: ... used without Samsung s authorization 7 21 11 Camera part Camera function does not work Yes No Reconnect the camera module Check the Camera connector on SUB PCB Yes U604 pin 10 2 8V No Check the U604 Yes OSC500 Pin 3 24MHz No Check OSC500 and R500 Yes Is there another problem END Replace the camera module Yes ...

Page 46: ... K1 MD14 MD15 K3 MD2 E2 E3 M7 MA0 D1 C1 MA1 MA2 B1 B2 MA3 MCLK C10 L1 MCS MD0 D2 E1 LD4 LD5 K10 LD6 K9 LD7 K8 LD8 K7 LD9 J9 M6 LREN LRS K5 LWEN J8 LD11 H8 LD12 G9 LD13 G8 LD14 F9 LD15 F8 LD2 L10 LD3 L9 L8 H9 D1 0 EXTVS C4 GP O HREF A9 LCS1 K6 L6 LCS2 M10 LD0 LD1 M9 LD10 DVSS18 C8 DVSS2 DVSS3 C9 D3 DVSS4 DVSS5 D8 E9 DVSS6 DVSS7 F3 F10 DVSS8 DVSS9 J10 DVSS11 K2 L5 DVSS12 DVSS13 M3 M4 DVSS14 DVSS15 M...

Page 47: ...ON RF input CH center freq 67 7kHz Amp 50dBm Check U100 pin4 L pin8 L U100 pin5 65dBm F101 pin1 67dBm U102 pin6 7 8 9 1V U102 pin32 70dBm pin33 70dBm Check ANT Switch control circuit Resolder U100 Resolder F101 C105 L107 Resolder L104 L105 L106 Check U102 pin4 10 22 2 7V Check Resolder U102 R103 R104 RF13MHz RF PSU Part Resolder U102 R126 R128 R129 R130 1V Yes Yes Yes Yes Yes Yes Yes Yes No No No ...

Page 48: ...8 L U100 pin11 18dBm U101 pin6 18dBm OSC100 pin1 15dBm U101 pin48 11dBm Change or Resolder U100 Check ANT Switch control circuit Resolder L115 C112 Resolder R114 R116 R117 U102 pin6 7 8 9 1V Yes Check U101 VBATT pin42 43 OK Resolder or Change U101 Check VBATT or PAM control signal Check Resolder RFLO signal RF13MHz RF PSU Part Yes Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No END Check U2...

Page 49: ...F input CH center freq 67 7kHz Amp 50dBm Check U100 pin4 L pin8 L U100 pin1 65dBm F102 pin1 67dBm U102 pin6 7 8 9 1V U102 pin38 70dBm pin39 70dBm Check ANT Switch control circuit Resolder U100 Resolder F102 C106 L114 Resolder L108 L110 L111 Check U102 pin4 10 22 2 7V Check Resolder U102 R103 R104 RF13MHz RF PSU Part Resolder U102 R126 R128 R129 R130 1V Yes Yes Yes Yes Yes Yes Yes Yes No No No No N...

Page 50: ...8V U100 pin9 18dBm U101 pin31 18dBm OSC100 pin5 15dBm U101 pin37 11dBm Change or Resolder U100 Check ANT Switch control circuit Resolder L116 C111 Resolder R108 R110 R111 U102 pin6 7 8 9 1V Yes Check U101 VBATT pin42 43 OK Resolder or Change U101 Check VBATT or PAM control signal Check U102 pin4 10 22 2 7V OK Check Resolder RFLO signal RF13MHz RF PSU Part Yes Yes Yes Yes Yes Yes Yes Yes No No No N...

Page 51: ...00UF R122 47 C152 10PF L10 8 5 6nH 12nH L114 3 C 1 G 4 G G 5 6 G 200 KMS 510 D CN10 0 A 2 C110 R125 100N F C112 0 5PF R105 7 5K 3 9PF C111 10PF C102 10N F C13 9 L10 2 2 7nH VCC 1 VCO N 1NF C136 OSC101 VC TCXO 214C6 26MHz 2 GN D OU T 3 4 5 1K C150 100NF R106 120PF C148 R107 1 5K R131 1K E1 1 E2 4 8 2P F C145 PEMD10 Q102 B1 2 B2 5 C1 6 C2 3 18 R108 5 6K 1 R13 0 180 1 R119 120PF C14 6 220K R109 C108 ...