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TYT Electronics Co, .Ltd
UHF Transceiver
TX790U
service manual
Introduction
This manual provides the technical information necessary for servicing for the TX790U DMR
UHF Transceiver
Servicing this equipment requires expertise in handing surface-mount chip components.
Attempts
By non-qualified person to service this equipment may result in permanent damage not covered
by The warranty ,and may be illegal in some countries
Two PCB layout diagrams are provided for each double - sided board in this transceiver. Each side
Of the board is referred to by the type of the majority of components installed on that side( side
A Or Side B ),In most cases one side had only chip components (surface-mount services ), and the
Other has either a mixture of both chip and leaded components (trimmers, coils , electrolytic
capacitors, ICs etc.),Or leaded components only .
As described in the pages to follow, the advanced microprocessor design of the TX790U
Transceiver allows a complete alignments can be performed from the front panel, using the
Alignment mode menu.
While we believe the information in this manual to be correct ,TYT assumes no liability for
damage that may occur as a result of typographical or other errors that may be present. Your
cooperation in pointing out any inconsistencies in the technical information would be
appreciated
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Table of Contents
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Summary of Contents for TYT TX790U
- Page 1 Transceiver allows a complete alignments can be performed from the front panel, using the Alignment mode menu. While we believe the information in this manual to be correct ,TYT assumes no liability for damage that may occur as a result of typographical or other errors that may be present. Your...
- Page 3 Contents Specifications ..........................3 Exploded View ＆ Miscellaneous Parts ................4-5 Service Manual ........................6-7 Circuit Description........................8 Parts List＆Pictures ......................9-17 Parts list location .........................18-21 Radio technical specification ....................23 Specification : PHOENIX(CE) General Frequency range : 400-480MHz Channel : 64 Channels Power supply Voltage : 7.4V DC±10% Current consumption : ≤1.6A Channel spacing : 12.5 / 25khz...
- Page 4 Specification subject to change without notice or obligation Specification : AGC(CE) TX790U DMR Transceiver service manual Exploded View ＆ Miscell aneous parts Front case assy (component) Front case Main plate Model lable (TX790U) Rubber (PTT) Rubber(sp/mic) Volume / Channel Knob...
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Page 5: Front Case
Transistor 3.2*2.5 3160026M32250000 MIC1 Mini speaker 58db 3171000006027581 Jack1 Audio jack 2.5mm JAKK2.5D 45010MD795RJG000 Jack2 Earphone jack 3.5mm JAKK3.5D 45010MD795RJG000 When replace a chip fuse, Use the part of the same type and value TX790U DMR UHF TRANSCEIVER USER MANUAL... - Page 6 BAT+ POW_SW U106 SGM4157YC R152 C157 R153 C155 DMR_AF AF POWER AMP SW101 C186 VOL-SWITCH FM/DMR_AF_SW R161 100R C187 C188 VOL_IN R165 R164 R163 R150 R151 R120 C152 R162 100R LINE_OUT SPK100 SPK101 C128 R128 C111 C173 C172 C171 C170 C153 C156 SPK-...
- Page 7 FLASH_SCK_1 R245 NFC-SCLK TP209 SPI0_SCLK NFC_SCLK DVSS PR_V FLASH_SDI_1 R246 NFC-MOSI SPI0_MOSI NFC_MOSI DVSS FLASH_SDO_1 R247 NFC-MISO SPI0_MISO NFC_MISO DVSS FLASH_CS2 R248 NFC-CSN SPI0_CSN_0 NFC_CSN DVSS FLASH_CS3 R249 NFC-HOLD SPI0_CSN_1 NFC_HOLD DVSS DVDD33 R250 NFC-WP NFC_WP DVSS DVDD33 FLASH_SCK C208 C221 C213 C212...
- Page 8 TP300 BAT7V5 VBATT+ U303 BAT+ Q301 J301 AD2736A UT2301 TP302 F301 L303 BATTERY-CON-2P 3AFUSE UPZ1608U221-2R2TF C337 VBATT+ L305 L310 4.7uH UPZ1608U221-2R2TF DC3V8 C300 C301 C302 C303 C304 C305 C306 R301 C310 C311 C328 C335 C336 R306 C338 100P R307 22uF/16V C340 C341 C342...
- Page 9 TX/RX J401 C444 C443 C500 D402 BA592 ANTENNA C401 C403 C405 C407 C446 L420 470P Q408 ER0.4X1.5X2T D401 BA592 HTU7G06S011P R410 C449 220P TP401 C408 C445 C442 C441 C440 C439 C499 C437 L416 R454 330R L401 L402 L403 L413 R420 L400 330R ER0.4X1.5X4T...
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Page 10: Circuit Description
Circuit description RF Receiving The RF carrier signal enters a low -pass filter through antenna, and then via antenna switch diode D401 (BA592) ＆ D402 (BA592), D400 (BA277) ＆ D403 (BA277), D404 (BA277), and then pass through a tape filter. , Then send it to the RF amplifier Q401 (2SK318AA). After enlarged the signal and pass another filter, finally send it to the U401 (BK4819) for demodulation. - Page 11 In the DMR mode, the voice signal is first sent to the A13 pin of U201 (C7000) through the microphone, The C7000 has been processed by the voice code and the baseband as a 4FSK signal from the 1 pin of the X601 (26M crystal) to modify the carrier wave signal. output from the 17th pin of the RF carrier signal from the U401 (BK4819), After entering the Q406 amplification through the buffer large q405 (2SC3356), then send it to the promotion amplifier Q407 (H3) and then to the power amplifier Q408 (HTU7G06S011P) to amplify the radio frequency signal to 10...
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Page 12: Part List
PART LIST : MD-795A PART LIST DATE 25-Oct-2023 MD790-UHF-V3. 0/5W（20221019） Version V3.0 SIZE TYT CODE NAME AND ZISE UNIT 3001000000004020 0Resistance 0402/0R/J unit 8.00 30010047A4104020 0Resistance 0402/4.7R/J unit 1.00 3001001004104020 1Resistance 0402/10R/J unit 3.00 3001002204104020 1Resistance 0402/22R/J unit 3.00 3001003304104020... - Page 13 capacitance 0402/2.0P/B/NP0/50V/1.0*0.5*0.5mm/ 3003002015104020 unit 1.00 Murate capacitance 0402/3.0P/B/NP0/50V/1.0*0.5*0.5mm/ 3003003015104020 unit 1.00 Murate capacitance 0402/4.0P/B/NP0/50V/1.0*0.5*0.5mm/ 3003004015104020 unit 1.00 Murate capacitance 0402/5.0P/B/NP0/50V/1.0*0.5*0.5mm/ 3003005015104020 unit 1.00 Murate capacitance 0402/6.0P/C/NP0/50V/1.0*0.5*0.5mm/ 3003006015104020 unit 1.00 Murate capacitance 0402/10P/J/COG/50V/1.0*0.5*0.5mm/ 3003010055104020 unit 5.00 Murate capacitance 0402/15P/J/COG/50V/1.0*0.5*0.5mm/ 3003015055104020 unit 2.00 Murate capacitance 0402/22P/J/COG/50V/1.0*0.5*0.5mm/...
- Page 14 capacitance 0402/273P/K/X7R/50V/1.0*0.5*0.5mm/ 3003027365104020 unit 2.00 Murate capacitance 0402/473P/K/X7R/50V/1.0*0.5*0.5mm/ 3003047365104020 unit 1.00 Murate capacitance 0402/104P/K/X7R/16V/1.0*0.5*0.5mm/ 3003010465004020 unit 62.00 Murate capacitance 0402/105P/K/X5R/10V/1.0*0.5*0.5mm/ 3003010565004020 unit 29.00 Murate 3003056265104020 capacitance 0402/562P/K/X7R/50V unit 4.00 capacitance 0603/1.0PF/B/NPO/50V/1.6*0.8*0.8m 300300101510603C unit 2.00 m/Murate capacitance 0603/2.0PF/B/NPO/50V/1.6*0.8*0.8m 300300201510603C unit 1.00 m/Murate capacitance 0603/3.0P/B/NPO/50V/1.6*0.8*0.8mm/ 300300301510603C...
- Page 15 30070CH303N04020 L0 inductance 0402/CH3.3N unit 1.00 30070CH407N04020 L0 inductance 0402/CH4.7N unit 1.00 300700CH22N04020 L1 inductance 0402/CH22N unit 2.00 300700CH27N04020 L1 inductance 0402/CH27N unit 1.00 30070CH39N004020 L1 inductance 0402/CH39N unit 1.00 300700CH47N04020 L1 inductance 0402/CH47N unit 1.00 30070CH100N06030 M3 inductance 0603/CH100N unit 1.00 30070CH220N06030...
- Page 16 3160032768000A00 B Crystal 32.768 / unit 1.00 30300TC75S51F000 Integrated circuit TC75S51F unit 1.00 30300AD2736A0000 Integrated circuit AD2736A/SOT23-6 unit 1.00 3030P25Q16HSSHIT Integrated circuit P25Q16SH-SSH-IT unit 2.00 30300LN4898SOP80 Integrated circuit Audio AM/LN4898_C/SOP8 unit 1.00 30300BK4819X0000 Integrated circuit BK4819/new unit 1.00 30300BA2904SFVE2 Integrated circuit BA2904SFV-E2 unit 1.00 30300R3111Q271A0...
- Page 21 TX790U Radio technical specification 1 Overview latest generation of high-quality, high-efficiency and high-performance radio intercom, its ultra-clear call quality and beautiful, compact and modern structure design, flexible expansion and simple Its operational performance makes it widely used in the airport, security, military, entertainment, service, manufacturing and property management industries.
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