DUAL BAND GSM TELEPHONE SGH-A408 SERVICE DUAL BAND GSM TELEPHONE Manual CONTENTS 1. Exploded Views and Parts List 2. Electrical Parts List 3. Block Diagrams 4. PCB Diagrams 5.
1. SGH-A408 Exploded Views and Parts List 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. GSM Telephone Exploded View GSM Telephone Parts List Travel Adapter STravel Adapter Parts List Cigarette Lighter Adaptor Cigarette Lighter Adapter Parts List Test Jig 1-7-1. Test Jig Cable 1-7-2. RF Jig Cable 1-7-3. Test Jig 2. SGH-A408 Electrical Parts List 3. SGH-A408 Block Diagrams 3-1. Main Block Diagram 3-2. Main RF 3-2-1 RF Tx Part 3-2-2 RF Rx Part 4. SGH-A408 PCB Diagrams 4-1. Main Top 4-2. Main Bottom 5.
1. SGH-A408 Exploded View and its Parts List 1-1.
SGH-A408 Exploded view and its Part List 1-2. GSM Telephone Parts List NO DESCRIPTION SEC.
SGH-A408 Exploded view and its Part List 1-3. Travel Adapter A B D C 1-4.
SGH-A408 Exploded view and its Part List 1-5. Cigarette Lighter Adaptor 1-6.
SGH-A408 Exploded view and its Part List 1-7. Test Jig (GH80-00161A) 1-7-1. Test Jig Cable (GH39-00096A) 1-7-2.
SGH-A408 Exploded view and its Part List 1-7-3.
2. SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 0 GH92-01228A 1 4302-001119 BAT200 BATTERY-LI(2ND) 3 V, 0.1MAH, -, -, 3.1 V, - 1 2203-000311 C100 C-CERAMIC, CHIP 0.12 nF, 5 %, 50 V, NP0, TP, 1 2203-005065 C101 C-CERAMIC, CHIP 1000 nF, +80-20 %, 10 V, Y5 V, TP, 1 2203-000330 C102 C-CERAMIC, CHIP 0.012 nF, 5 %, 50 V, NP0, TP, 1 2203-005571 C103 C-CERAMIC, CHIP 10000 nF, +80-20 %, 6.3 V, Y5 V, 1 2203-000359 C104 C-CERAMIC, CHIP 0.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2203-005509 C212 C-CERAMIC, CHIP 330 nF, +80-20 %, 10 V, Y5 V, TP, 1 2203-005061 C213 C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1 2203-005061 C214 C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1 2203-005061 C280 C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1 2203-000233 C300 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1 2203-000233 C301 C-CERAMIC, CHIP 0.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2203-000386 C334 C-CERAMIC, CHIP 0.015 nF, 5 %, 50 V, NP0, TP, 1 2203-000812 C335 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 1 2301-001230 C336 C-FILM, CHIP 10 nF, 5 %, 16 V, TP, 2012, - 1 2203-005158 C337 C-CERAMIC, CHIP 0.0022 nF, 0.25pF, 50 V, NP0, TP, 1 2203-005158 C338 C-CERAMIC, CHIP 0.0022 nF, 0.25pF, 50 V, NP0, TP, 1 2203-000812 C339 C-CERAMIC, CHIP 0.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2203-000233 C504 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1 2203-000233 C505 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1 2203-000278 C506 C-CERAMIC, CHIP 0.01 nF, 0.5 pF, 50 V, NP0, TP, 1 2203-005056 C507 C-CERAMIC, CHIP 0.0068 nF, 0.25 pF, 50 V, NP0, TP, 1 2203-000233 C508 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1 2203-000233 C509 C-CERAMIC, CHIP 0.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2203-005065 C549 C-CERAMIC, CHIP 1000 nF, +80-20 %, 10 V, Y5 V, TP, 1 2007-007771 C550 R-CHIP 0 ohm, 5 %, 1/16 W, DA, TP, 1 2203-005509 C551 C-CERAMIC, CHIP 330 nF, +80-20 %, 10 V, Y5 V, TP, 1 2203-000725 C552 C-CERAMIC, CHIP 3.9 nF, 10 %, 50 V, X7R, TP, - 1 2203-005509 C553 C-CERAMIC, CHIP 330 nF, +80-20 %, 10 V, Y5 V, TP, 1 2203-000812 C600 C-CERAMIC, CHIP 0.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2203-000812 C641 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 1 2203-000812 C642 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 1 2203-000812 C643 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 1 2203-000812 C644 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 1 2203-000812 C647 C-CERAMIC, CHIP 0.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2703-001543 L300 INDUCTOR-SMD 33 nH, 5 %, 1.8x1.12x1.02mm 1 2703-001513 L301 INDUCTOR-SMD 100 nH, 5 %, 1.8x1.12x1.02mm 1 2703-002214 L302 INDUCTOR-SMD 8.2 nH, 5 %, 1.6X0.8X0.8MM 1 2703-001513 L303 INDUCTOR-SMD 100 nH, 5 %, 1.8x1.12x1.02mm 1 2703-001545 L304 INDUCTOR-SMD 47 nH, 5 %, 1.8x1.12x1.02mm 1 2703-001543 L305 INDUCTOR-SMD 33 nH, 5 %, 1.8x1.12x1.02mm 1 2703-001547 L306 INDUCTOR-SMD 10 nH, 5 %, 1.8x1.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2007-000140 R100 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1 2007-000140 R101 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1 2007-001313 R103 R-CHIP 330 ohm, 5 %, 1/16 W, DA, TP, 1 2007-007092 R104 R-CHIP 1.1 kohm, 5 %, 1/16 W, DA, TP, 1 2007-000775 R105 R-CHIP 33 kohm, 5 %, 1/16 W, DA, TP, 1 2007-007468 R106 R-CHIP 121 kohm, 1 %, 1/16 W, DA, TP, 1 2007-007092 R107 R-CHIP 1.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2007-000172 R318 R-CHIP 10 ohm, 5 %, 1/16 W, DA, TP, 1 2007-007771 R403 R-CHIP 0 ohm, 5 %, 1/16 W, DA, TP, 1 2007-000162 R404 R-CHIP 100 kohm, 5 %, 1/16 W, DA, TP, 1 2007-000143 R407 R-CHIP 4.7 kohm, 5 %, 1/16 W, DA, TP, 1 2007-000143 R409 R-CHIP 4.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 2007-000140 R529 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1 2007-000148 R530 R-CHIP 10 kohm, 5 %, 1/16 W, DA, TP, 1 2007-000145 R531 R-CHIP 6.2 kohm, 5 %, 1/16 W, DA, TP, 1 2007-008117 R532 R-CHIP 2.
SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS 1 0504-001042 U501 TR-DIGITAL BCR10PN, NPN/PNP, 250 mW, 10K/10K, 1 0504-001042 U502 TR-DIGITAL BCR10PN, NPN/PNP, 250m W, 10K/10K, 1 0504-001012 U503 TR-DIGITAL DTC114YE, NPN, 150 mW, 10K/47K, 1 2909-001152 U505 FILTER-DUPLEXER 942.5MHZ, 897.5MHZ, 1/1.
3. SGH-A408 Block Diagrams 3-1.
SGH-A408 Block Diagrams 3-2.
SGH-A408 Block Diagrams 3-2-1.
SGH-A408 Block Diagrams 3-2-2.
4.
C552 C546 C417 Q401 R413 ZD401 C520 C518 U515 U510 C658 C528 R506 C659 C539 C670 C610 U502 LAM1 Q601 C671 L602 C622 R207 R209 Q500 C601 C662 C642 C643 C644 C605 V601 C606 C630 V605 C625 R604 R605 C603 C627 L600 R635 Q603 C660 C604 C636 CN601 C637 C638 C639 C640 C647 C666 C657 C664 D601 CN602 R643 C632 C631 V618 U600 U8024 C618 Q200 Q201 F300 C663 C665 C641 R610 C607 ZD605 V619 C608 R609 D200 R600 R601 R607 LED600 C200 Q604 Q605 U602 U8031 U501 R 5 0 2
5.SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-1. Power ON ‘POWER ON’ does not work Y Check the current consumption more than 100 mA N Download again N Charge the Battery N Check to the path from CN604 to pin 38 of U400 and keypad N Change U400 N Check the clock generation circuit (related to U400 and OSC100) Y Check the Battery Voltage more than 3.3V Y Check the pin 38 of U400 is more than 3.2 V Y U400 pin 33,28,30 = 2.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-2.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-3. Sim Part Phone can’t access SIM card Y Check the pin 1, 5 of CN400. voltage is 2.8V ? Check the SIM related circuit of the U400 N Y Check the SIM connector’s CN400 Connection to SIM card Resolder CN400 N Y Check the circuit around U515 (Serial EEPROM) and data stored in it Y END VBAT VCCD VCCD C410 150PF R409 4.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-4. Charging Part Abnormal charging part Y Check the pin 17, 18 of CN604-1 is around 5V N Replace TA N Check the U201 using Factory Test Program N Resolder R648, R651, R646 N Change U605 Y Check the pin 2 of U8021 is “Low” Y Check the pin 5, 6 of U8021 is more than 0.5V Y Check the Voltage of pin 5 of U605 is between 3.2 V and 4.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-5. Microphone Part Micro Phone does not work Y check the connection from MIC600 N Change MIC600 N Resolder R104, R107, R103 Y Audio loopback is enabled by board test program. R104, R107 2.2 V Y END Mic_Bias R104 1.1K R103 330 C108 33UF C112 47NF C111 22PF Mic+ C113 2.2PF C115 47NF C116 22PF MicR107 1.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-6.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-7. Key Data Input Check initial operation Y Check the connection between CN602 and Keypad.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-8. Ring Indicator Ring Indicator does not work Y Check the connection between CN602 and Keypad.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-9. Back Light Backlight does not work Y Check the connection between CN601 and LCD Module.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-10. Alert Tone Abnormal Alert tone Y Is there alert wave signal on the R635 during alert tone test? N ALERT by Test S/W N Check the circuit related to Q603 N Resolder D601 and C620 N Change the Buzzer Y Is there alert wave signal on the Q603 pin3 during alert tone test? Y Check the C620 ≥ 3.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-11. GSM Receiver RX On RF input : 62 CH Amp.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-12
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 1 RX_62_U505 PIN9 2 RX_62_U505 PIN5 SAMSUNG Proprietary-Contents may change without notice 5-13
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 3 RX_62_F501 PIN5 4 RX_62_U507 PIN16 SAMSUNG Proprietary-Contents may change without notice 5-14
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5 RX_62_F301 PIN1 6 RX_62_F300 PIN1 SAMSUNG Proprietary-Contents may change without notice 5-15
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 7 RX_62_F300 PIN4 8 U300_ PIN26 SAMSUNG Proprietary-Contents may change without notice 5-16
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-12. GSM Transmit Tx On (level : 5) Battery voltage : 3.8 V Using 20 dB Attenuator N 1 U505 Pin 9 ≥ 30 dBm Resolder CN500 Y N 2 U505 Pin 1 ≥ 30 dBm Y Check voltage Pin 2 : H Pin 4 : L Pin 8 : H Pin 10 : L Resolder or Change U505 Y N N 3 LAM1 Pin 3 ≥ 30 dBm Y Resolder or Change LAM1 Y Check U510 pin14 1V ~ 2V ? Resolder or Change U503, Q501 N 4 U510 pin 4 ≥ 0 dBm N U513 pin 3 1~2.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-18
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 1 TX_62_U505 PIN9 2 TX_62_U505 PIN1 SAMSUNG Proprietary-Contents may change without notice 5-19
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 3 TX_62_lam1 PIN3 4 TX_62_U510 PIN4 SAMSUNG Proprietary-Contents may change without notice 5-20
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-13. DCS Receiver RX On RF input : 698 CH Amp.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-22
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 1 RX_698_U505 PIN9 2 RX_698_U505 PIN7 SAMSUNG Proprietary-Contents may change without notice 5-23
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 3 RX_698_F500 PIN5 4 RX_698_U507 PIN16 SAMSUNG Proprietary-Contents may change without notice 5-24
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5 RX_698_F301 PIN1 6 RX_698_F300 PIN1 SAMSUNG Proprietary-Contents may change without notice 5-25
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 7 RX_698_F300 PIN4 8 U300_ PIN26 SAMSUNG Proprietary-Contents may change without notice 5-26
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-14. DCS Transmit Tx On (level : 0) Battery voltage : 3.8 V Using 20 dB Attenuator N 1 U505 Pin 9 ≥ 25 dBm Resolder CN500 Y N 2 U505 Pin 11 ≥ 25 dBm Y Check voltage Pin 2 : L Pin 4 : H Pin 8 : L Pin 10 : H Y Resolder or Change U505 N N 3 LAM1 Pin 1 ≥ 25 dBm Y Resolder or Change LAM1 Y Check U510 pin14 1V ~ 2V ? Resolder or Change U503, Q501 N 4 U510 pin 2 ≥ 0 dBm N U513 pin 3 1~2.
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-28
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 1 TX_698_U505 PIN9 2 TX_698_U505 PIN11 SAMSUNG Proprietary-Contents may change without notice 5-29
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 3 TX_698_lam1 PIN1 4 TX_698_U510 PIN2 SAMSUNG Proprietary-Contents may change without notice 5-30
ELECTRONICS ©Samsung Electronics Co.,Ltd. November. 2001 Pinted in Korea. Code No.: GH68-02384A BASIC.
