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SmartTrunk Systems ST-2112D Service Manual Download Page 39

 

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

39 

 

 

16

 

ST-2112 PCB POWER LAYER 

 

 

 

 

 

Summary of Contents for ST-2112D

Page 1: ...ST 2112D 450Mhz 520Mhz UHF FM DIGITAL TRANSCEIVER SERVICE MANUAL SmarTrunk Systems INC ST 2112D SM R1 2 ...

Page 2: ...LUME CONTROL 10 4 2 5 Sub audio signaling 10 4 2 6 ANALOG AUDIBLE SIGNALING 10 4 2 7 DIGITAL AUDIO PROCESSING 10 4 3 Transmitter System 11 4 3 1 ANALOG TX SIGNAL 11 4 3 2 DIGITAL TX AUDIO 11 4 3 3 Drive and Final Amplifier Stages 11 4 3 4 Automatic Transmit Power Control 12 5 RC 2112 ALIGNMENT 13 5 1 Introduction 13 5 2 ALIGNMENT 13 5 3 Alignment Procedure 14 5 3 1 GENERAL ALIGNMENT CONSIDERATIONS...

Page 3: ...5 9 DCS signaling alignment 21 5 5 10 CTCSS signaling alignment 21 5 5 11 FSK signaling alignment 22 5 6 RECEIVER ALIGNMENT 23 5 6 1 DISCRIMINATOR GAIN 23 6 COMPLEMENTARY RADIO ALIGNMENT 24 6 1 BATTERY WARNING LEVEL 24 7 COMPLIMENTARY USER ALIGNMENT 25 7 1 OPTION ALIGNMENT 25 7 1 1 ANALOG Microphone gain 25 7 1 2 ANALOG External Mic Gain 25 7 1 3 ANALOG AGC 26 7 1 4 DIGITAL AGC 26 7 1 5 MINIMUM VO...

Page 4: ... 12 ST 2112 COMPONENT LOCATOR BOTTOM LAYER 35 13 ST 2112 PCB TOP LAYER 36 14 ST 2112 PCB BOTTOM LAYER 37 15 ST 2112 PCB GROUND LAYER 38 16 ST 2112 PCB POWER LAYER 39 17 ST 2112 FRONT BOARD COMPONENT LOCATOR TOP LAYER 40 18 ST 2112 FRONT BOARD COMPONENT LOCATOR BOTTOM LAYER 41 19 ST 2112D BOM 42 20 ST 2112 KEYBOARD DISPLAY BOM 51 21 ACCESSORY PORT 53 22 ST 2112 SERVICE MANUAL REVISIONS 55 ...

Page 5: ... Yes Key Function selection Yes TRANSMIT MAX RF power 4 W Frequency Stability 1PPM Bandwidth Khz 6 25 12 5 25 Adjacent Channel Power 65dBC typ SNR 45dB typ Analog harmonic distortion 3 typ AF 1Khz 60 deviation Data transmit rate 2400 4800 9600 bps Max frequency deviation 2 5Khz 12 5Khz BW 5Khz 25Khz BW Analog Modulation type 11K0F3E 25K0F3E TDMA Emissions 8K30F7E 8K30F7D FDMA Digital emissions 6K2...

Page 6: ...2 ST 2112 EXPLODED VIEW ST 2112V Jack Chang Daniel Martin 2 ST 2112 EXPLODED VIEW ...

Page 7: ...tection D2 Driver Q3 Buffer AMP Q2 TX CTRL U3 CLOCK Y1 POWER CTRL U2 FLASH MEMORY U4 RAM MEMORY U7 DISPLAY GPS G SENSOR PWM KEYBOARD SIDE KEYS USB SERIAL PORT Main Processor U8 Radio U1 Audio Processor Modem U5 VOCODER U6 CLOCK Y2 MIC AMP U12 AUDIO PA U10 CLOCK Y3 JP2 ...

Page 8: ...Notes ...

Page 9: ...4 2 1 Front end RF Receiver Incoming RF signals from the antenna are delivered to the Receiver Unit and pass through a Low pass filter antenna switching diode and then fed to the receiver U1 passing through a limiter BPF 4 2 2 ANALOG Audio Processing The RF signal is tuned by U1 which includes a base band DSP audio processing recovering flat audio from DC up to 3500 hz The detected audio is amplif...

Page 10: ...on the audio processor U5 Once decoded the sub audio signaling is reported to the processor where the firmware compares it with the value programmed into the current channel programming If the received signaling matches the channel programming then the main processor U8 requests the audio processor U5 to open the audio patch 4 2 6 ANALOG AUDIBLE SIGNALING DTMF signals MDC1200 and tone signals are ...

Page 11: ...xternal microphone J5 are fed directly to the vocoder chip U6 which perform the data codification delivering the digitized and encoded audio as digital frames which are processed by the Main Processor U8 which add a FEC Frame Error Correction encrypt the information and add the user related information as user ID etc The final data frame is fed to the Audio Processor U5 which has a built in modem ...

Page 12: ...tted power against the referred level stored on current channel memory adjusting the power control level generated as reference by one DAC output on the same Audio processor U5 then amplified by U2 MCP6241U controlling the gate current on 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 and 5Watts...

Page 13: ...nstructions regarding repair Authorized Smartrunk service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components Those who do undertake any of the following alignments are cautioned to proceed at their own risk Problems caused by unauthorized attempts at realignment are not covered by the warranty...

Page 14: ...except where specified otherwise Correct alignment is not possible with an antenna After completing one step read the following steps to determine whether the same test equipment will be required If not remove the test equipment except dummy load and wattmeter if connected before proceeding Correct alignment requires that the ambient temperature be the same as that of the transceiver and test equi...

Page 15: ... radio is detected actual radio parameters are loaded Once the radio is connected a new screen pops up showing all alignment parameters The software downloads actual alignment parameters stored into radio memory so the information displayed on each alignment step is the real value form the previous alignment The radio also stores in a special memory area original values assigned in factory You can...

Page 16: ...the radio has stable characteristics for all bandwidth it is recommendable to align on middle of the radio working band 5 5 1 Main Clock alignment To align the main clock for radio Tx and RX please select Main Clock Alignment option Alignment screen Fig 12 alignment menu Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the ...

Page 17: ...slider or introduce the value manually at the time you check the real transmit power on the wattmeter connected to the radio as recommended on TX alignment diagram As soon as Start is pressed the radio start to transmit a carrier so please verify the antenna dummy load is properly connected to avoid any damage to the transmitter As soon the desired value is reached press Finish to store the value ...

Page 18: ...t then move the slider to reach the desired value at the time you checks the deviation meter to reach the desired signaling level for narrow band operation Radio will generate a 1000Hz alignment reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory Wide band channels uses the same limiter No additional wide band max deviation ali...

Page 19: ...s reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings 5 5 5 FDMA DATA MODULATION alignment To align 4FSK signaling deviation for FDMA mode select FDMA Deviation on...

Page 20: ... into current alignment settings 5 5 7 EIA tones Level Alignment EIA signaling generated by ST 2112 must be aligned by selecting EIA Tones Level alignment option from the alignment menu Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow ban...

Page 21: ...g alignment DCS signaling encoded from ST 2112 must be aligned by selecting DCS Level alignment option from the alignment menu Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radio will generate 134 4Hz audio tone for alig...

Page 22: ... from factory will be loaded into current alignment settings 5 5 11 FSK signaling alignment To align FSK PSK signaling deviation select FSK Mod Level on Alignment screen Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radi...

Page 23: ... 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 Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value As soon the desired value is reached press Finish to st...

Page 24: ...ttery Warning Level on Alignment screen Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value This value means the percentage of charge when the radio starts the warning signals to the user visual and acoustic As soon the desired value is reached press Finish to store the value on radio memory Default value is 10 which correspond t...

Page 25: ...ALIGNMENT To access to the option alignment menu select Edit then Option form the main software toolbar As soon as you click on Options the Options screen is popped up From this screen the user can adjust 7 1 1 ANALOG Microphone gain It aligns microphone sensitivity Alignment step is 3 2dB For noisy environments or when voice encryption is used we recommend keeping it as low as possible Press OK t...

Page 26: ...e microphone or 0dB gain on the external microphone connection then you must program the Analog Gain at 6 4dB and check AGC as bellow Press OK to store it in the file The value will be updated after the file is transferred to the radio 7 1 4 DIGITAL AGC ST 2112 has an Automated Gain Control for digital microphone This function adjusts the gain to reach a dynamic gain value which makes the voice to...

Page 27: ...f the radio to a noisy environment the squelch level is not high enough the user can adjust a common reference for all the channels in the radio by adjusting the general squelch level Option screen on the edit menu lets you to program the default squelch reference for all the channels This value can be adjusted on the fly for the user if the dealer program on squelch control key or navigating thro...

Page 28: ... new window will pop up 8 1 DISPLAYS AND LEDS This screen lets you adjust the behavior of the display and keyboard backlight 8 1 1 Auto backlight delay alignment The auto backlight mode automatically set on power off status to the backlight after any event to reduce the battery demand To change the value of the delay before the backlight is powered off please enter the quantity of desired seconds ...

Page 29: ...edge any time any keyboard key is pressed Check Pre TOT if you want to play back a tone to allert when time out timer is close to expire 5 seconds ahead Check Rotary if you want to play back a tone to acknowledges any time the rotary switch changes its position 8 3 ANNUNCIATION Third folder on appearance screen allows the user to define if the radio will play back any annunciation message for some...

Page 30: ... back any time power level high med low or auto has been changed Check GPS if you want the radio plays a concerning message back any time the GPS changes the status Powered on Powered Off Fix etc only on those versions which includes GPS Check RSSI if you want the radio plays a concerning message back any time you ask for current RSSI Press OK once you finish the setting of all desired messages Th...

Page 31: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 31 This page left blank intentionally ...

Page 32: ... 1 P10 HEADER 1 1 1 P11 HEADER 1 1 1 MOD1 MOD2 R17 47 VOL AUDIO OUTP RV1 10k 3 1 2 4 5 R18 47K C61 0 DET MOUT PWR_TUNE 3VD PWFB C123 100nF C124 10uF C222 10nF 18V P12 HEADER 1 1 1 P13 HEADER 1 1 1 P14 HEADER 1 1 1 3VA C138 10nF C220 100pF C16 10nF C15 150pF R83 4K7 3VD PWR_TUNE R13 10K Q3 2SK3475 1 3 2 7V C257 22uF P17 HEADER 1 1 1 P15 HEADER 1 1 1 P16 HEADER 1 1 1 3VD 3VR 3VD L6 27nH 5VAF 5V C21 ...

Page 33: ... 4K7 R36 1k R30 2k2 R22 4k7 R37 1k R31 2k2 R23 4k7 R24 1K R20 0 R19 0 R7 NC D4 R10 NC D7 D2 R8 330 C11 102 5V R9 10 C8 103 C7 106 C10 104 U2 HT7233 Vin 1 GND 2 Sht 3 Vout 5 BP 4 TP4 1 SW7 1 2 3 4 SW6 1 2 3 4 SW5 1 2 3 4 SW4 1 2 3 4 R27 1k R26 2k2 R25 4k7 FNC ACCESY PORT POWER SUPPLY U1 PEB 916 ANT 1 AGND1 2 AGND2 3 AGND3 4 VBAT 5 GND1 6 NC 7 AGND4 8 AGND5 9 AGND6 10 VCC 11 AGND7 12 NRES 13 AGND8 1...

Page 34: ...11 ST 2112 COMPONENT LOCATOR TOP LAYER ...

Page 35: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 35 12 ST 2112 COMPONENT LOCATOR BOTTOM LAYER ...

Page 36: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 36 13 ST 2112 PCB TOP LAYER ...

Page 37: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 37 14 ST 2112 PCB BOTTOM LAYER ...

Page 38: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 38 15 ST 2112 PCB GROUND LAYER ...

Page 39: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 39 16 ST 2112 PCB POWER LAYER ...

Page 40: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 40 17 ST 2112 FRONT BOARD COMPONENT LOCATOR TOP LAYER ...

Page 41: ...ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 41 18 ST 2112 FRONT BOARD COMPONENT LOCATOR BOTTOM LAYER ...

Page 42: ...T C86 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C93 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C105 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C132 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C198 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C227 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C228 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6106AD6T C229 CAP CER 10UF 6 3V X5R 20 0603 10uF CK6...

Page 43: ...00PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C129 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C130 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C131 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C133 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C142 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C144 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C145 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102...

Page 44: ... 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C241 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C244 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C246 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C247 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C249 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C253 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X C44 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK11...

Page 45: ...IC 01UF 50V X7R 0402 10nF CK5103AK5X C252 CAP CERAMIC 01UF 50V X7R 0402 10nF CK5103AK5X C5 CAP 10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X C10 CAP 10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X C47 CAP 10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X C64 CAP 10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X C66 CAP 10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X C72 CAP 10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X C74 CAP...

Page 46: ...5V 0603 1uF CK5105AD7RR C238 CAP CERAMIC 1UF 16V Y5V 0603 1uF CK5105AD7RR C24 CAP CER 82PF 50V 5 NP0 0603 82pF CK1820AD4AR C56 CAP CER 6 8PF 50V 5 NP0 0603 6 8pF CK9689AD4A C59 CAP CER 6 8PF 50V 5 NP0 0603 6 8pF CK9689AD4A C25 CAP CER 7PF 50V NP0 0402 7pF CK1070AK2A C33 CAP CER 8PF 50V NP0 0402 8pF CK1080AK2A C30 CAP CERAMIC 0 5PF 50V C0G 0402 5pF CK1059AK1A C31 CAP CERAMIC 0 5PF 50V C0G 0402 5pF ...

Page 47: ...MD3 DAN222 EDDAN0222Y D8 LED GREEN RED BICOLOR 0606 SMD LTST C195KGJRKT EX01Y40203 F1 FUSE 3A 32V 0603 FAST C2Q C2Q 3 EX02Y40258 J2 CONN RCPT MINI USB2 0 5POS USB EX07N49886 J6 BATTERY CONNCETOR RIGHT ANGLE CON4 EX07Y49885 L2 BEAD COIL BEAD YCBAD18592 L18 BEAD COIL BEAD YCBAD18592 L1 BEAD COIL BEAD YCBAD18592 L3 CHOKE COIL 82uH YCMCI8243D L4 SPRING COIL 27nH YCSPG18424 L9 CHOKE COIL 15nH YCMCI1533...

Page 48: ...10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R94 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R95 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R106 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R115 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R119 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R133 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R140 RES 10K OHM 1 16W 5 0402 SMD 10K RCY041034Z R13 RES 10K OHM 1 1...

Page 49: ... RCY040004Z R78 RES 0 0 OHM 1 16W 0402 SMD 0 RCY040004Z R80 RES 0 0 OHM 1 16W 0402 SMD 0 RCY040004Z C60 RES 0 0 OHM 1 16W 0402 SMD 0 RCY040004Z C61 RES 0 0 OHM 1 16W 0402 SMD 0 RCY040004Z C161 RES 0 0 OHM 1 16W 0402 SMD 0 RCY040004Z R8 RES 100 OHM 1 16W 5 0402 SMD 100 RCY041014Z R28 RES 100 OHM 1 16W 5 0402 SMD 100 RCY041014Z R29 RES 100 OHM 1 16W 5 0402 SMD 100 RCY041014Z R33 RES 100 OHM 1 16W 5 ...

Page 50: ... 100K OHM 1 16W 5 0402 SMD 100K RCY041044Z R31 RES 100K OHM 1 16W 5 0402 SMD 100K RCY041044Z R112 RES 100K OHM 1 16W 5 0402 SMD 100K RCY041044Z R120 RES 100K OHM 1 16W 5 0402 SMD 100K RCY041044Z R139 RES 100K OHM 1 16W 5 0402 SMD 100K RCY041044Z R34 RES 120K OHM 1 16W 5 0402 SMD 120K RCY041244Z R107 RES 220K OHM 1 16W 5 0402 SMD 220K RCY042244Z R35 RES 470K OHM 1 16W 5 0402 SMD 470K RCY044744Z R36...

Page 51: ...07250Z U5 dPMR MODEM IC CMX 7141 YNCM07141Q U6 VOCODER IC CMX 618 YNCM00618Q U7 IC SRL SRAM 64K 3 6V 8 TSSOP 23K640 YNMR23K640 U8 IC AVR MCU 64K 64QFN AT90USB YNAT1286MU U10 IC AMP HDPH SPEAKER UNBAL 8MSOP BH7824 YNRO07824Z U11 IC REG BOOST ADJ 0 5A 8MLF MIC2290 YNML02290Z U16 LDO LINEAR REGULATOR 1 8V 300mA HT7218 YNHT07218Z U18 IC REG LDO 5V 0 2A SOT89 3 XC6201 YNTX1P502P U17 IC REG LDO 5V 0 2A ...

Page 52: ...OR 2 2K 0402 RCY042224Z 8 5 RESISTOR 4 7K 0402 RCY044724Z 9 1 RESISTOR 22K 0402 RCY042234Z 10 1 RESISTOR 27K 0402 RCY042734Z 11 1 CAP 0 1UF 0402 CK5104AK5X 12 2 CAP 2 2UF 0402 CK6225AK6T 13 1 CAP 0 33UF 0402 CK0334AK5X 14 1 CAP 4 7UF CK0475AD7R 15 8 LED 0603 EX01Y40205 16 0 FUSE 0 2A 32V 0402 EX02Y40259 17 1 IC MIMD10A 7 F YNDCOMD10A 18 20 TACTILE SW EWPS33086X 19 1 PCB CONNECTOR 36P EX07Y49872 20...

Page 53: ...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 4 3 2 1 Mic RX Serial TTL Mic PTT ...

Page 54: ...in radio GND SDA High Speed Serial data I O 0 3V up to 400Khz SCL High Speed Serial Clock 0 3V up to 400Khz 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 V Accesory power 3 3Vdc 200 mA Speaker TX Serial TTL Speaker 8 1 ...

Page 55: ...22 ST 2112 SERVICE MANUAL REVISIONS AUTHOR RELEASE DATE REMARKS DANIEL MARTIN 1 1 JUN 2013 INITIAL RELEASE VERSION DANIEL MARTIN 1 2 JUN 2013 ADDED SOFTWARE ZONE SPECIFICATION Copyright 2014 Printed in Malaysia www smartrunk com ST 2112D SM R1 2 ...

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