GSM TELEPHONE SGH-N620E Manual SERVICE GSM TELEPHONE CONTENTS Specification Circuit Description Exploded Views and Parts List Electrical Parts List Block Diagrams PCB Diagrams Flow Chart of Troubleshooting...
Page 2
ELECTRONICS ⓒ Samsung Electronics Co.,Ltd. February. 2003 Printed in Korea. Code No.: GH68-04684A BASIC.
- 1 0 0 d B m TDM A M u x C el l Ra d iu s 3 5 K m 3 5 Km 2 K m SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
6.5dBm and fed into Power Amplifier(U303). The PA output power and power ramping are well controlled by Auto Power Control circuit. We use offset PLL below SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 6
IC stop charging process. 7. Audio SPK2P and SPK2N from VP40578 are connected to the main receiver. MIC2P and MIC2N are connected to the main SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 7
This system uses the 13MHz , VC-TCXO. Toyocom. AFC control signal form VP40578 controls frequency from 13MHz x-tal. It generates the clock frequency. This clock is connected to VP40578, YMU762. SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 8
3. SGH-N620E Exploded View and its Parts list 1. Cellular phone Exploded View SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 9
3001-001254 MOTOR GH31-00033A BUSHING ANT GH71-00588A ANTENNA GH42-00137A->E BATTERY-ASS'Y GH43-00435A MOBILE CAP GH73-00892A SCREW CAP GH73-00891A SCREW M1.7X5 6001-001346 MIC-RUBBER GH73-02596A FRONT TOTAL ASS'Y GH97-03134A SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 10
3. Test Jig (GH80-10508A) 3-1. RF Test Cable 3-2. Test Cable 3-3. Serial Cable (GH39-00174A) (GH39-00079A) 3-4. Power Supply Cable 3-5. DATA CABLE 3-6. TA (GH39-00078A) (GH44-00184G) SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 11
R144 1109-001204 U201 2007-000143 R147 1201-001954 U103 2007-000148 R135 1202-001036 U210 2007-000148 R201 1203-002077 U101 2007-000148 R203 1203-002187 U209 2007-000148 R222 1203-002598 U104 2007-000148 R223 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
R231 2007-000162 R227 2007-002796 R235 2007-000162 R228 2007-002796 R236 2007-000162 R233 2007-007008 R307 2007-000162 R241 2007-007008 R308 2007-000162 R242 2007-007095 R145 2007-000168 R234 2007-007095 R303 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 13
C230 2203-000254 C106 2203-000679 C332 2203-000254 C107 2203-000679 C336 2203-000254 C134 2203-000679 C337 2203-000254 C136 2203-000679 U601 2203-000254 C212 2203-000812 C213 2203-000254 C241 2203-000812 C236 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 14
C131 2203-003054 C204 2203-005503 C213 2203-003054 C248 2203-005503 C211 2203-005050 C310 2203-005664 C117 2203-005050 C312 2203-005664 C130 2203-005061 C104 2203-005664 C133 2203-005061 C118 2203-005840 C113 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 15
L310 2703-002205 L309 2703-002484 L303 2703-002485 L306 OSC201 2801-003747 2809-001264 OSC301 2901-001116 F101 2901-001254 L120 2904-001417 F302 2904-001470 F301 2909-001197 U301 3301-001362 L101 3404-001152 SW101 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
CHARGING CURRENT RF INTERFACE SYSTEM CLOCK (13MHz) XVCC SRAM 3VRF Li-ion BATT FLASH (STANDARD) VDD3.0 AVCC2.5 EEPROM CHARGING RTC_CLOCK CIRCUIT LVCC (32.768KHz) KEYPAD RTC_VCC LED3V3 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 17
U301 CN301 ANTTENA Si4133T-BM (U305) CONNECTOR OSC301 VCTCXO DCS TX 1710 ~ 1785 MHz (CH698:1747.4MHz) Dual PAM (U303) GSM TX 880 ~ 915 MHz (CH62:902.4MH SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 18
(CH698:1747.4MHz) Dual PAM (U303) Si4200-F (U302) SDATA SCLK SENB PDNB ② Tx power +VBATT from U 205 TxPower ② 3VRF TXEN ① BAND SELECTION VREG SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 19
U301 1849.8 ~ 1919.8 MHz CN301 OSC301 <DCS> ANTTENA AFC ③ VCTCXO 1804.9 ~ 1879.9 MHz CONNECTOR Si4133T-BM (U305) -50dBm @947.067 MHz -50dBm @1842.467 MHz SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
6. SGH-N620E PCB Diagrams 1. Main PCB Top Diagram SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 21
SGH-N620E PCB Diagrams 2. Main PCB Bottom Diagram SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
U102 pin 3 ≠ 3.0V Check the clock generation circuit Check for the clock signal at R320 (related to OSC301 and Q304) Check the initial operation SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 23
SGH-N620E Flow Chart of Troubleshooting Power On SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 24
R234 = "H" (MSIZE) Resolder R234 Check the circuit around R233 = "L" Resolder R233 (EXTPROC) Check the circuit around Replace PBA U300(EEPROM) and data stored in it SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 25
SGH-N620E Flow Chart of Troubleshooting Initial U205 U300 U209 R217 CSROM SYSRST C212 MSIZE R221 GPIO3 BOOT SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Check the U106 pin 3 > 4.9V Resolder U106 R103 (CHG_OIN side) = "L" Resolder R103 Check Q014 pin 5 ≠ 4.2V Resolder components around U106 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 27
SGH-N620E Flow Chart of Troubleshooting Charging SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
After SIM card insert, CN101 pin Replace PBA 2 = "H" (SIMRST)? Check the circuit around U208 (Serial EEPROM) and datad stored in it SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Check the circuit RC Filer to R230, R231, R220, R236 MIC201 C219, C220, C221, C252 Replace the MIC or MIC Holder Check soldering of MIC Module SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 30
SGH-N620E Flow Chart of Troubleshooting Microphone SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Receiver does not work Resolder CN200 CN200 pin 2,3 = short Replace the PBA CN200 pin 2,3,6 = 1.5V Replace the Receiver Is Receiver working? 7-10 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 32
Speaker does not work CN105 connected Connect CN105 and Speaker Speaker? Is Speaker working? Replace the Speaker U107 pin 7 = 3.0V Replace the U102 7-11 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 33
SGH-N620E Flow Chart of Troubleshooting HPOUT-L/MON O SDOUT HPOUT- R SCLK SYNC SDI N /W R SPVDD SPVSS C158 100NF 7-12 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Check initial operation When one of the keys is Check the Dome sheet pushed, is it displayed on Replace the PBA Keypad is OK? 7-13 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Resolder R136, R137, Q105 pin 3 = "L" or Resolder Q105 Resolder R126, R127, R129, R130, KEY PCB LED on? R131, R132, R133, R134 7-14 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
SGH-N620E Flow Chart of Troubleshooting 10.Ring Indicator Ring indicator LED does not work Resolder U102 U102 pin 12 = "H" Replace 3 color LED Resolder 3 color LED 7-15 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
U304 pin 2,3,4,5 Check U304 pin Check U304 pin > 100mV 7, 20 OK? 14,16,17,18 > OK? Check Radio PSU, Resolder U205 Resolder U304 RF13MNz part 7-16 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
I/O signal RF 13MHz, 8 ≠ 40mV -6dBm OK? RF PSU part Resolder U303 Check U302 pin9, 10, 12, 13 ≠ -6dBm OK? Resolder U302 7-17 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Resolder U302 Check Check U304 U304 U304 Resolder pin 2,3,4,5 pin14.16,17, pin 7,20 U304 > 100mV 18 OK? Check Racio PSU RF13MHz part Resolder U205 7-18 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
U302 pin5, 6, 7, 8 pin9,10,12,13 >= Check & Resolder >= 40mV -6dBm I/O signal, RF 13MHz Resolder U301 Check U302 pin9,10,12,13 >= -6dBm Resolder U302 7-19 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
Page 41
SGH-N620E Flow Chart of Troubleshooting Transmitter 7-20 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...