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SmarTrunk ST-2112C Service Manual

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ST-2112C
(400Mhz ~ 470Mhz)
UHF FM DIGITAL TRANSCEIVER
SERVICE MANUAL
SmarTrunk Systems, INC.
ST-2112C SM R1.2

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Summary of Contents for SmarTrunk ST-2112C

  • Page 1 ST-2112C (400Mhz ~ 470Mhz) UHF FM DIGITAL TRANSCEIVER SERVICE MANUAL SmarTrunk Systems, INC. ST-2112C SM R1.2...

  • Page 2: Table Of Contents

    Alignment Procedure ......................14 5.3.1. GENERAL ALIGNMENT CONSIDERATIONS: ................14 5.4. MAIN RADIO ALIGNMENT ....................... 15 5.5. TRANSMITTER ALIGNMENT: ....................15 5.5.1. Main Clock alignment: ......................16 5.5.2. Transmit Power alignment: ....................17 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 3 SQUELCH LEVEL: ........................27 7.1.7. DISABLE RF POWER ......................27 RADIO APPEARANCE ALIGNMENT ....................28 8.1. DISPLAYS AND LEDS: ....................... 28 8.1.1. Auto backlight delay alignment: ..................28 8.1.2. Power on Text: ........................28 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 4 ST-2112 PCB POWER LAYER ......................39 ST-2112 FRONT BOARD COMPONENT LOCATOR (TOP LAYER) ............40 ST-2112 FRONT BOARD COMPONENT LOCATOR (BOTTOM LAYER)..........41 ST-2112C BOM ..........................42 ST-2112 KEYBOARD & DISPLAY BOM ....................52 ACCESSORY PORT: ........................... 53 ST-2112 SERVICE MANUAL REVISIONS ................... 55 ST-2112C SM R 1.2...

  • Page 5: Specifications

    Specifications: SPECIFICATION ST-2112C Frequency Range [Mhz] 400 TO 470 Channels Groups/Banks Power [Vdc] 6.4 to 8.8 Dimensions [mm] 130(H)x36(D)x52(W) Weight [gr] (oz) 320 - (11.3) Temperature range - 30 °C ~ 60 °C (-22°F ~ +140°F) Signaling 51 CTCSS tones / 183 DCS tones / 65534 SDR IDs...

  • Page 6: St-2112 Exploded View

    ST-2112 EXPLODED VIEW 2 . ST-2112 EXPLODED VIEW ST-2112V Daniel Martin Jack Chang...

  • Page 7: St-2112 Simplified Diagram

    ST-2112 SIMPLIFIED DIAGRAM TX CTRL [U3] Power Final Buffer Ant Sw Driver Detection D1/D3 Radio CLOCK POWER [Y1] CTRL [U2] Audio Processor AUDIO Modem [U5] [U10] G-SENSOR DISPLAY CLOCK Main Processor [Y2] [U8] [U12] FLASH CLOCK MEMORY [Y3] [U4] VOCODER [U6] MEMORY [U7]...
  • Page 8 Notes:...

  • Page 9: St-2112 Rf Description

    Receiver Unit and pass through a qualifying the signal level. If the Low-pass filter, antenna switching signal level is higher than the ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 10: Virtual Volume Control

    (U6). If the received signaling matches The vocoder re-builds the audio the channel programming, then the from the compressed data then main processor (U8) requests the applies filter it, adjust the volume ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 11: Transmitter System

    U1 with a The transmit signal then passes corresponding balance controlled through the antenna switch D1 by software. (BAR63) and is low-pass filtered to suppress harmonic spurious radiation before delivery to the antenna ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 12: Automatic Transmit Power Control

    Q1 and Q17. Evenly when power level is adjusted by software on three levels (Hi, Med, Lo) the power value can be adjusted to any desired value between zero 5Watts alignment software. Notes: ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 13: Rc-2112 Alignment

    Realignment should therefore not attempts at realignment are not be necessary except in the event of covered by the warranty policy. a component failure, or altering Also, SmarTrunk reserves the right version type. to change circuits and alignment procedures interest...

  • Page 14: Alignment Procedure

    A 50-Ohm RF Dummy Load and in- line wattmeter must be connected Please be sure you turn the radio on to the main antenna jack in all before continue with this alignment procedures that request procedure. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 15: Main Radio Alignment

    A complementary message will be For any transmit related alignment displayed on the time the software parameter, low power will be used. detects the radio connected to USB port on the computer. 5.5. TRANSMITTER ALIGNMENT: ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 16: Main Clock Alignment

    Factory 5.5.1. Main Clock alignment: Default. To align the main clock for radio Tx and RX, please select Main Clock Alignment option Alignment screen. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 17: Transmit Power Alignment

    Please be sure that the PLL is To realign, please select [Start] then locked as soon as you press [Start], move the slider or introduce the ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 18: Mid Power Level Alignment

    Modulation Gain alignment: Maximum deviation analog This is a critical parameter which signals modulated from ST-2112 may not be realigned to different can be aligned by Max Deviation values other than factory default. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 19: Fdma Data Modulation Alignment

    If you want to retrieve factory default, press [Factory] instead of [Start]. You will be asked to confirm the factory default alignment, and ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 20: Tdma Data Modulation Alignment

    2112 must be aligned by selecting DTMF Level alignment option from 5.5.7. EIA tones Level Alignment: the alignment menu. EIA signaling generated by ST-2112 must be aligned by selecting EIA Tones Level alignment option from the alignment menu. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 21: Dcs Signaling Alignment

    2112 can be aligned by selecting CTCSS Level alignment option from DCS signaling encoded from ST- the alignment menu. 2112 must be aligned by selecting DCS Level alignment option from the alignment menu. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 22: Fsk Signaling Alignment

    5.5.11. FSK signaling alignment: align FSK/PSK signaling deviation, select FSK Mod Level on Alignment screen. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 23: Receiver Alignment

    This is a critical parameter which may not be realigned to different values other than factory default. Under your risk, if you still prefer to realign the overall modulation gain, you must select Discriminator Gain on Alignment screen. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 24: Complementary Radio Alignment

    This value means the percentage of charge when the radio starts the warning signals to the user (visual and acoustic). soon desired value reached, press [Finish] to store the value on radio memory. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 25: Complimentary User Alignment

    The value will be updated after the file is transferred to the radio. 7.1.2. ANALOG External Mic Gain: It aligns microphone sensitivity. As soon as you click on Options… the Options screen is popped up: Alignment step is 3.2dB. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 26: Analog Agc

    (standard voice at 4 inches away from the microphone), or 6.0dB gain external microphone connection, then you must program the Digital Gain at 15.0dB and the external gain on 6.0dB, then check Digital AGC as bellow: ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 27: Minimum Volume Level

    ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 28: Radio Appearance Alignment

    Type here the text to show on the display when the radio is powered This string is very convenient for radio identification dealer advertising at the time the radio is powered on. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 29: Leds

    Check Squelch mode if you want Check Pre TOT if you want to play radio plays concerning back a tone to allert when time out ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 30 Press OK once you finish the setting desired messages. This feature will be stored into the file then it will be transferred to the radio at the time the file is uploaded to the radio. ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 31 This page left blank intentionally ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 32: St-2112 Schematic

    IF COMPONENT IS DIFERENT BETWEEN THE DIFERENT MODELS, THEN Y OU WILL FIND THREE VALUES UNDER THE COMPONENT. C5VT PWR_TUNE TX5V BLUE VALUES CORRESPOND TO ST-2112V TEMP PINK VALUES CORRESPOND TO ST-2112C GREEN VALUES CORRESPOND TO ST-2112V LCB1608-600 150pF PWR_TUNE BEAD 10nF...

  • Page 33: St-2112 From Board Schematic

    5JKL 6MNO SW11 SW12 SW13 SW14 7PQRS 8TUV 9WXYZ SW15 SW16 MIMD10A SW17 SW18 SW19 LEFT RIGHT SMARTRUNK SYSTEMS, INC SW20 Title ST-2112 - FRONT BOARD ROW1 ROW2 ROW3 Size Document Number DM-1001-111026 Date: Wednesday , August 29, 2012 Sheet...

  • Page 34: St-2112 Component Locator (Top Layer)

    11 ST-2112 COMPONENT LOCATOR (TOP LAYER)

  • Page 35: St-2112 Component Locator (Bottom Layer)

    12 ST-2112 COMPONENT LOCATOR (BOTTOM LAYER) ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 36: St-2112 Pcb Top Layer

    13 ST-2112 PCB TOP LAYER ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 37: St-2112 Pcb Bottom Layer

    14 ST-2112 PCB BOTTOM LAYER ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 38: St-2112 Pcb Ground Layer

    15 ST-2112 PCB GROUND LAYER ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 39: St-2112 Pcb Power Layer

    16 ST-2112 PCB POWER LAYER ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 40: St-2112 Front Board Component Locator (Top Layer)

    17 ST-2112 FRONT BOARD COMPONENT LOCATOR (TOP LAYER) ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 41: St-2112 Front Board Component Locator (Bottom Layer)

    18 ST-2112 FRONT BOARD COMPONENT LOCATOR (BOTTOM LAYER) ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 42: St-2112C Bom

    CAP 1000PF 50V CERAMIC X7R 0402 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 43 CAP 1000PF 50V CERAMIC X7R 0402 C201 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 C202 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 C203 CK1102AK5X 0402 CAP 1000PF 50V CERAMIC X7R 0402 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 44 CAP CER 47PF 50V NPO SMD 0402 C193 47pF CK1470AK4A 0402 CAP CER 47PF 50V NPO SMD 0402 47pF CK1470AK4A 0402 CAP CER 47PF 50V NPO SMD 0402 470pF CK1471AK4A 0402 CAP CERAMIC 47PF 50V NP0 0402 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 45 CAP .10UF 16V CERAMIC Y5V 0402 C151 100nF CK5104AK5X 0402 CAP .10UF 16V CERAMIC Y5V 0402 C152 100nF CK5104AK5X 0402 CAP .10UF 16V CERAMIC Y5V 0402 C153 100nF CK5104AK5X 0402 CAP .10UF 16V CERAMIC Y5V 0402 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 46 CAP CER 7PF 250V NP0 0603 10pF CK4100AD5A 0603 CAP CER 10PF 100V 10% NPO 0603 33pF CK4330AD4A 0603 CAP CER 33PF 100V 5% NP0 0603 27pF CK9270AD4A 0603 CAP CER 27PF 250V 5% NP0 0603 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 47 TY2SK3476Z 2SC3356 TY2SC3356Z 2SK3475 TY2SK3475Z DTA114EM TYDTA114EM VMT3 PNP PRE BIASED TRANSISTOR 33tk RTU143334Y THERMISTOR RCY041034Z 0402 RES 10K OHM 1/16W 5% 0402 SMD RCY041034Z 0402 RES 10K OHM 1/16W 5% 0402 SMD ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 48 RES 1.0K OHM 1/16W 5% 0402 SMD RCY041024Z 0402 RES 1.0K OHM 1/16W 5% 0402 SMD RCY041024Z 0402 RES 1.0K OHM 1/16W 5% 0402 SMD RCY041024Z 0402 RES 1.0K OHM 1/16W 5% 0402 SMD ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 49 RES 22K OHM 1/16W 5% 0402 SMD RCY044714Z 0402 RES 470 OHM 1/16W 5% 0402 SMD R113 RCY044714Z 0402 RES 470 OHM 1/16W 5% 0402 SMD RCY044704Z 0402 RES 47 OHM 1/16W 5% 0402 SMD ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 50 RES 2.2 OHM 1/16W 5% 0402 SMD R125 RCY042294Z 0402 RES 2.2 OHM 1/16W 5% 0402 SMD R128 RCY042294Z 0402 RES 2.2 OHM 1/16W 5% 0402 SMD R130 RCY042294Z 0402 RES 2.2 OHM 1/16W 5% 0402 SMD ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.
  • Page 51 BOARD TO BOARD 18X2 CONN DTC114EM TYDTC114EM VMT3 NPN PRE BIASED TRANSISTOR AT23DF321 YNAT25321A 8-SOIC (0.209", 5.30mm Width) FLASH MEMORY 32MBIT VC-TXCO EFO128000Y CRYSTAL HT7233 YNHT07233Z HT7233 YNHT07233Z HT7233 YNHT07233Z CRYSTRAL 16Mhz EFO160000Y CRYSTAL ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 52: St-2112 Keyboard & Display Bom

    CK5104AK5X CAP. 2.2UF (0402) CK6225AK6T CAP. 0.33UF (0402) CK0334AK5X CAP. 4.7UF CK0475AD7R LED (0603) EX01Y40205 FUSE 0.2A 32V (0402) EX02Y40259 IC MIMD10A-7-F YNDCOMD10A TACTILE SW EWPS33086X PCB CONNECTOR 36P EX07Y49872 PCB FHA8-M108000GA EX07Y49911 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 53: Accessory Port

    21 ACCESSORY PORT: In the side of the radio, you will find four connectors: 1 – USB: USB 2.0 compliance 2 – External mic, External PTT and RX serial data (2.5mm) Mic (-) RX Serial (TTL) Mic (+)/PTT...
  • Page 54 I/O 3 Digital Input/Output 1K Ohm, 0-3.3V I/O 2 Digital Input/Output 1K Ohm, 0-3.3V I/O 1 Digital Input/Output 1K Ohm, 0-3.3V I/O 0 Digital Input/Output 1K Ohm, 0-3.3V Accesory power 3.3Vdc @ 200 mA ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

  • Page 55: St-2112 Service Manual Revisions

    22 ST-2112 SERVICE MANUAL REVISIONS AUTHOR RELEASE DATE REMARKS DANIEL MARTIN JUN-2013 INITIAL RELEASE VERSION DANIEL MARTIN JUN-2013 ADDED SOFTWARE ZONE SPECIFICATION Copyright 2014 Printed in Malaysia www.smartrunk.com ST-2112C SM R1.2 ST-2112C SM R 1.2 SMARTRUNK SYSTEMS, INC.

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