Samsung STH-A225 Service Manual
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Samsung STH-A225 Service Manual

Tdma mobile telephone
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SERVICE
TDMA MOBILE TELEPHONE
TDMA MOBILE
TELEPHONE
STH-A225
Manual
CONTENTS
1. Trouble Shooting
2. Electrical Parts List
3. Exploded Views and Parts List
4. Block Diagrams
5. PCB Diagrams
6. Circuit Description &
Circuit Diagrams

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  • Page 1 TDMA MOBILE TELEPHONE STH-A225 SERVICE Manual TDMA MOBILE TELEPHONE CONTENTS 1. Trouble Shooting 2. Electrical Parts List 3. Exploded Views and Parts List 4. Block Diagrams 5. PCB Diagrams 6. Circuit Description & Circuit Diagrams...
  • Page 2 ELECTRONICS ©Samsung Electronics Co.,Ltd. December. 2001 Pinted in Korea. Code No.: GH68-01930A BASIC.

  • Page 3: Trouble Shooting

    32K_XIN=32.768 kHZ Need to check neighbor part Need to check OSC302, U202 & neighbor part VCC, ADD(0:21), DATA(0:15), FLASH_CS, SRAM_CS, UBE, Memory (U206) MEMOEB, MEMWEB control signal OK? Need to replace Memory(U206) Program Running SAMSUNG Proprietary-Contents may change without notice...
  • Page 4 LCD EL Vibrator OK Send Command Main Audio Receiver Path ON (Test mode:031, 131, 134, 185) SPK+,SPK- Signal OK? Need to check CN101 & neighbor part Speaker Output OK? Replace LCD module LCD module Good SAMSUNG Proprietary-Contents may change without notice...
  • Page 5 Need to check CN102-1, Q102 & neighbor part Key Display Good Mic Path Good Send Command ALT_LED_ON Send Command SVC_LED_ON Send Command LED_ON (Test mode:178) LED Operation Need to check CN102-1 & neighbor part GOOD SAMSUNG Proprietary-Contents may change without notice...
  • Page 6 STH-A225 Trouble Shooting 1-4. Abnormal Buzzer Operation START Send Command Ringer Path ON (Test mode:183) Ringer Signal Need to check U104 & AU101 Buzzer Sound Output Replace AU101 Buzzer Operation Good SAMSUNG Proprietary-Contents may change without notice...
  • Page 7 Audio set Path=HS (Test mode:187, 185, 032) HS_SENSE=H Need to check Q103, U102 & neighbor parts Press Button on the Ear-Jack SEND_END=H Need to check Q103, U102 & neighbor parts Ear_Mic phone Operation Good SAMSUNG Proprietary-Contents may change without notice...
  • Page 8 2. RF Section 2-1. Call processing and Online Test START Normal SVC? Check RX path Set up Call OK? Check TX path Measure SINAD/BER Good? Check RX path Measure Tx Power Good? Check TX path DONE SAMSUNG Proprietary-Contents may change without notice...
  • Page 9 (Test mode:031) PON_VRF3=H U301_8=-54dBm Need to check F306 V_LNA_CELL=H F304 input=-34dBm U208_1=H U207_1=H Need to check U209, U208, U207 Need to check U301 & neighbor parts U304_45=-35dBm Need to check F304 & neighbor parts SAMSUNG Proprietary-Contents may change without notice...
  • Page 10 U207 & neighbor parts Replace U304 U304_34 Lev=-26dBm Freq=130.05MHz Replace F302 Need to check U304_37 Lev=4dBm U304, L303, C308, L301, C307 Freq=450kHz Replace F301 or U304_25 Lev=-2dBm Need to check R302, R304, C301 Freq=450kHz MODE TDMA AMPS SAMSUNG Proprietary-Contents may change without notice...
  • Page 11 Need to check U304 & R327, R323, C353, C107 U101_40 BBCLK= 6.2208MHz or 4.96NHz or 5.12MHz Replace U203 U101_32RX_CLK= BBCLK/2 or BBCLK/8 Replace U203 U101_31 RX_SYNC= BBCLK/32 or BBCLK/128 Replace U203 U101_31 RX_DATA= serial data Replace U203 DONE SAMSUNG Proprietary-Contents may change without notice...
  • Page 12 IF_ON=H, PON_TX=H PON_VRF3=H U101_40 BBCLK= 6.2208MHz or 4.096MHz or5.12MHz Replace U203 U101_34 TX_CLK= BBCLK/32 or BBCLK/8 Replace U203 U101_33 TX_SYNC= BBCLK/512 or BBCLK/128 Replace U203 U101_33 TX_DATA= serial data Replace U203 TDMA AMPS MODE SAMSUNG Proprietary-Contents may change without notice 1-10...
  • Page 13 V_RF2=3.0V or Fc=Local_freq + 175.05 Replace U304 U304_59(RF OUT) Need to check measure Level U304_66 or Send command PA_CNT Replace U304 (Test mode:132) Level is adjustable? U304_59(RF OUT) Replace F310 Fc=Local_freq + 175.05 SAMSUNG Proprietary-Contents may change without notice 1-11...
  • Page 14 VBATT(U305_14,15,16)=3.2~1V around 30dB or Replace U305 Need to check F306_1 around same power F313 & neighbor parts with U305 output Need to check F306 insertion loss F313 & neighbor parts under 3dB DONE SAMSUNG Proprietary-Contents may change without notice 1-12...
  • Page 15 CHARGER-SCHN105 TC TCH020ABN, SCH-N105, AC/DC, -, -, -, -, GH59-00174A UNIT-KEY PAD ASS’Y STH-A205, HUW9518-010010, -, KEY PAD ASS’Y, -, GH92-00829A PBA MAIN-STHA225 STH-A225, -, BRAZ, MAIN PBA, -, -, -, -, - 3002-001062 AU101 BUZZER-MAGNETIC 88dB, 3.6 V, 90 mA, 2.731KHz, TP...
  • Page 16 C-CERAMIC, CHIP 0.068 nF, 5 %, 50 V, NP0, TP, 1005 2203-000233 C172 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1005 2203-000233 C173 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...

  • Page 17: Table Of Contents

    C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1005 2203-000438 C231 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-005061 C232 C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...

  • Page 18: Electrical Parts List

    C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1005 2203-000233 C327 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1005 2203-000278 C328 C-CERAMIC, CHIP 0.01 nF, 0.5 pF, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...

  • Page 19: C-Ceramic, Chip 1000 Nf, +80-20 %, 10 V, Y5 V,

    C-CERAMIC, CHIP 10 nF, 10 %, 16 V, X7R, TP, 1005, - 2203-005061 C370 C-CERAMIC, CHIP 100 nF, +80-20 %, 16 V, Y5 V, TP, 1005 2203-000425 C373 C-CERAMIC, CHIP 0.018 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...

  • Page 20: C-Ceramic, Chip 0.012 Nf, 5 %, 50 V, Np0,

    C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-000438 C412 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-000438 C413 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - SAMSUNG Proprietary-Contents may change without notice...
  • Page 21 C-CERAMIC, CHIP 1000 nF, +80-20 %, 10 V, Y5 V, TP, 1608 2203-000278 C477 C-CERAMIC, CHIP 0.01 nF, 0.5 pF, 50 V, NP0, TP, 1005 2203-000425 C478 C-CERAMIC, CHIP 0.018 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...
  • Page 22 INDUCTOR-SMD 330 nH, 10 %, 0.8 x 1.6 x 0.8 mm 2703-001860 L303 INDUCTOR-SMD 150 nH, 5 %, 1.6 x 0.8 x 0.8 mm 2703-001752 L304 INDUCTOR-SMD 39 nH, 5 %, 1.0 x 0.5 x 0.5 mm SAMSUNG Proprietary-Contents may change without notice...
  • Page 23 TR-DIGITAL RN2104, PNP, 100 mW, 47K/47K, SSM, TP 0501-002318 Q103 TR-SMALL SIGNAL UMW8N, NPN, 150 mW, UMT6, TP, 27-270 0504-000168 Q201 TR-DIGITAL RN1104, NPN, 100 mW, 47K/47K, SSM, TP 0504-000172 Q202 TR-DIGITAL RN2104, PNP, 100 mW, 47K/47K, SSM, TP SAMSUNG Proprietary-Contents may change without notice...
  • Page 24 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-001320 R128 R-CHIP 1.8 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-000151 R129 R-CHIP 15 kohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 2-10...
  • Page 25 R-CHIP 22 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-000173 R220 R-CHIP 22 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-000173 R221 R-CHIP 22 ohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 2-11...
  • Page 26 R-CHIP 330 kohm, 1 %, 1/16 W, DA, TP, 1005 2007-000172 R258 R-CHIP 10 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-001319 R259 R-CHIP 1.2 kohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 2-12...
  • Page 27 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-000174 R314 R-CHIP 47 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-001323 R315 R-CHIP 3 kohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 2-13...
  • Page 28 R-CHIP 10 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-000138 R354 R-CHIP 100 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-000138 R355 R-CHIP 100 ohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 2-14...
  • Page 29 THERMISTOR-NTC 10 kohm, 3 %, 4100 K, 30 mW/C, TP 1205-001826 U101 IC-TRANSCEIVER D5204-22, TQFP, 80P, 470MIL, PLASTIC, 3.6 V, -, - 1203-001979 U103 IC-VOLTAGE REGULATOR 5320, SSOP, 8P, 110MIL, PLASTIC, 6.12 V, 300 SAMSUNG Proprietary-Contents may change without notice 2-15...
  • Page 30 DIODE-TVS -, 6.1/-/7.2 V, 150 W, SOT-323-5L 0406-001083 ZD205 DIODE-TVS -, 6.1/-/7.2 V, 150 W, SOT-323-5L 0404-001110 ZD206 DIODE-SCHOTTKY RB751S-40, 40 V, 30 mA, SOD-523, TP 0404-001110 ZD207 DIODE-SCHOTTKY RB751S-40, 40 V, 30 mA, SOD-523, TP SAMSUNG Proprietary-Contents may change without notice 2-16...
  • Page 31 3. STH-A225 Exploded View and its Parts List 1. Cellular phone Exploded View SAMSUNG Proprietary-Contents may change without notice...

  • Page 32: Cellular Phone Parts List

    STH-A225 Exploded view and its Part List 2. Cellular phone Parts List SEC CODE Location Description Remark Gold Silver GH72-01977B FOLDER UPPER GH72-01977A GH72-01977E GH72-01977F colombia 6001-000876 SCREW MACHINE 6001-000876 GH07-00092A GH07-00092A 3101-001239 MOTOR 3101-001239 SPEAKER 3001-001220 3001-001220 GH75-00851B SUA, FOLDER LOWER...
  • Page 33 STH-A225 Exploded view and its Part List 3. Test Jig (GH80-00614A) Serial Cable Power Supply Cable 4. TC 5. RF Test Cable (GH44-00145G) 110V (GH39-00093A) Mexico, Colombia, Brazil 6. Cigarette Lighter Adaptor (GH44-00091A) 7. Test Cable (GH39-00092A) SAMSUNG Proprietary-Contents may change without notice...

  • Page 34: Block Diagrams

    4. STH-A225 Block Diagrams 1. Base Band Part Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 35 STH-A225 Block diagrams 2. Radio Part Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 36 STH-A225 Block diagrams MEMO SAMSUNG Proprietary-Contents may change without notice...

  • Page 37: Pcb Diagrams

    R 3 9 3 R 3 4 4 CN102 Q302 C 4 1 0 R 3 7 4 C 3 8 3 C 4 0 9 C228 C 4 4 6 R 3 7 5 SAMSUNG Proprietary-Contents may change without notice...
  • Page 38 C164 C162 Q201 Q204 R228 ZD202 C375 R227 R249 U208 R226 C230 R225 R264 R246 ZD204 R224 R223 OSC301 R222 C176 R221 R220 L316 C364 U209 C341 C209 F302 C210 U202 L302 L308 R282 SAMSUNG Proprietary-Contents may change without notice...

  • Page 39: Circuit Description

    STH-A225 provides the AMPS and the Digital TDMA (cellular band only) of compliance with TIA/EIA-137. The radio operation of the STH-A225 has been implemented with the receiver, the transmitter, and the local oscillator controlled by the PLL. The circuit of the STH-A225 is described as followings.
  • Page 40 STH-A225 Circuit Description & Circuit Diagrams Figure1. BEC interface and block diagram SAMSUNG Proprietary-Contents may change without notice 10-2...
  • Page 41 This part mainly interface with IFC (U101) and RF part. As for interface of IFC, that will be explained detail in next section. As important signals are PREAMP_G for receiver path, PA-GATE, ALC_EN for transmitter path, PLL_DATA, PLL_CLK, PLL_STRB1 for PLL synthesizer, RX_BAT, TX_BAT for power management. SAMSUNG Proprietary-Contents may change without notice 10-3...
  • Page 42 Since the auxiliary output is not internally amplified, an external audio amplifier is applied before connection to the two headset and HFK. Figure 2. IFC interface and block diagram SAMSUNG Proprietary-Contents may change without notice 10-4...
  • Page 43 Since the auxiliary output is not internally amplified, an external audio amplifier (U105) is applied before connection to the headset and HFK. SAMSUNG Proprietary-Contents may change without notice 10-5...
  • Page 44 2. RF Section 2-1.Introduction From the starting point of developing the STH-A225, the cellular and the PCS band operations have been intended. Therefore, the STH-A225 contains many dual-band components and rooms for PCS band components, in order to widen the operating band for the next product. The active components is playing...
  • Page 45 The output power of U305 is transmitted to F313 (Cellular band coupler) in order to help the Tx power control by using the power detector diode. In result, the Tx power is transmitted to the air interface via an antenna. SAMSUNG Proprietary-Contents may change without notice 10-7...
  • Page 46 Auto Gain Control voltage PA_CNT IFC/RFIC Power Amplifier control voltage DEMOD RFIC/IFC Discriminator output TXDA_REF RFIC/IFC Tx section common mode DC bias PON_TX BEC/Regulator TX up converter power (V_RF2:RFIC) PON_VRF3 BEC/Regulator Local Amp power(V_RF3:RFIC) SAMSUNG Proprietary-Contents may change without notice 10-8...
  • Page 47 DATA(6)_T SPK- AVCC DATA(5)_T VIBRATOR DATA(4)_T EL_EN DATA(3)_T 20 20 DATA(2)_T VAUX DATA(1)_T 22 22 MEMOEB R118 R119 R120 R126 C137 R121 100K R122 R123 R124 C134 C135 C136 68PF 68PF 68PF STH-A221_IFIC SAMSUNG Proprietary-Contents may change without notice 10-9...
  • Page 48 F-RP# D4 R282 C216 C217 RESET ZD204 S-OE# MEMOEB DP_TX_DATA F-OE# F-VSS S-WE# F-VSS MEMWEB S-VSS F-WE# HP_PWR NOTE: WAITING FOR REPLAY FROM SAMSUNG ABOUT C_F PIN STH-A221_BASE NOTE: TDMA EVENT -SPARE TIMMING SIGNALS SAMSUNG Proprietary-Contents may change without notice 10-10...
  • Page 49 C339 C464 C469 C450 C451 C452 C458 C459 15PF 10NF 15PF 100PF 10NF 15PF 15PF R398 R399 STH-A221_RF PA_CNT Note: 1.L325,L332 are High Q inductor (Coilcraft 0805HQ series) 2.C401,C402,C443,C444 are High Q capacitors SAMSUNG Proprietary-Contents may change without notice 10-11...

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