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DIGITAL PORTABLE RADIO

Service Manual

Preface This manual describes the information related to the product repair. It is intended for use by qualified technicians only. Before repairing the product properly, please read this manual carefully. This manual is applicable to the following product: BP51X Digital Portable Radio (X may represent 2, 5, 6, or 8)

Documentation Information This section describes the conventions and revision history of this document. Conventions

Instruction Conventions

Icon Description Indicates information that can help you make better use of your product. Indicates references that can further describe the related topics. Indicates situations that could cause data loss or equipment damage. Indicates situations that could cause minor personal injury. Indicates situations that could cause major personal injury or even death.

Notation Conventions

Item Description Example Boldface Denotes menus, tabs, parameter names, window names, dialogue names, and hardware buttons. To save the configuration, click Apply. The Log Level Settings dialogue box appears. Press the PTT key. " " Denotes messages, directories, file names, folder names, and parameter values. The screen displays "Invalid Battery!". Open "PSS.exe". Go to "D:/opt/local". In the Port text box, enter "22".

Directs you to access a multi-level menu. Go to File > New. Italic Denotes document titles. For details about using the DWS, refer to Dispatch Workstation User Guide. Courier New Denotes commands and their execution results. To set the IP address, run the following command: vos-cmd - m name IP

Revision History Version Release Date Description V01 July 2022 Added VHF (136– 174 MHz). V 00 March 2022 Initial release.

UHF (400– 470 MHz) Contents

i

• 1. Product Layout Contents
• 2. Disassembly and Reassembly
  • 2.1 Tools
  • 2.2 Procedure
• 3. Exploded View and Packaging Guide..................................................................................................
  • 3.1 Exploded View
  • 3.2 Packaging Guide
• 4. Specifications
• 5. Circuit Description
  • 5.1 Baseband Section............................................................................................................................
    • 5.1.1 Power Supply Module
    • 5.1.2 Control Module
    • 5.1.3 Audio Module
  • 5.2 RF Section
    • 5.2.1 TX Circuit
    • 5.2.2 RX Circuit
    • 5.2.3 FGU Circuit
• 6. Troubleshooting Flowchart
  • 6.1 Control Circuit
  • 6.2 RX Circuit
  • 6.3 TX Circuit
• 7. Interface Definition
• 8. Tuning Description..............................................................................................................................
  • 8.1 Tools
  • 8.2 Tuning Procedure
    • 8.2.1 Tuning the Radio
    • 8.2.2 Testing the Radio
• 9. PCB View
• 10. Block Diagram
• 11. Schematic Diagram
• 12. Part List

UHF (400– 470 MHz) Product Layout 1

1. Product Layout

No. Part Name No. Part Name No. Part Name 1 Channel Selector Knob 7 Antenna 13 Strap Hole 2 Push-to-Talk (PTT) Key 8 LED Indicator 14 Belt Clip 3 Volume Up Key 9 Speaker 15 Battery 4 Volume Down Key 10 Microphone 16 Charging Contacts 5 Side Key 3 (SK3) 11 Accessory Connector / / 6 On-Off Key 12 USB Type-C Port / /

UHF (400– 470 MHz) Disassembly and Reassembly 3 Solder Joint of Speaker Solder Joint of Microphone

4. Use tweezers to remove the male FPC connectors, and then remove the main board. Male FPC Connector
5. Rotate the antenna counter-clockwise to remove it, pull out the Channel Selector knob, and then use a socket wrench to remove the nuts from the Channel Selector knob.

Exploded View and Packaging Guide UHF (400– 470 MHz) 4

3. Exploded View and Packaging Guide 3.1 Exploded View Parts list: No. Part No. Description Qty. No. Part No. Description Qty. 1 5116000081705A Side key bracket 1 19 5113010081525A Earpiece PC sheet 1 2 51160000 00229A (^) PTT key cover 1 20 5113050091517A Blackout foam 1 3 5110020081520A Silicone rubber PTT key 1 21 11500000059653 Main board 1 4 5116000081706A Channel selector knob 1 22 5113050000341A Protective foam for filter 4 5 5111000000193A Inner lining for knob 1 23 5107000000625A Self-tapping screw 4 6 5110000000265A Silicone rubber emergency key 1 24 5113010061001A Waterproof sheet for aluminum chassis 2

Exploded View and Packaging Guide UHF (400– 470 MHz) 6 3.2 Packaging Guide

UHF (400– 470 MHz) Specifications 7

4. Specifications General Frequency Range 400 – 470 MHz Dimensions (H x W x D) (with battery and without antenna) 115 mm x 55 mm x 29.5 mm Weight (with battery and antenna) 21 0 g (±5%) Zone Capacity 4 Channel Capacity 64 Channel Spacing 12.5 KHz/20 KHz/25 KHz Operating Voltage 7.4 V (rated) Battery 1500 mAh Li-ion battery Battery Life (5/5/90 duty cycle, high TX power)  Analog: 12 hours (1500 mAh)/16 hours (2000 mAh)  Digital: 1 6 hours (1500 mAh)/21 hours (2000 mAh) Antenna Impedance 50 Ω RX Section Sensitivity (Analog)  Analog: 0.18 μV (12 dB SINAD)  Digital: 0.18 μV Adjacent Channel Selectivity TIA- 603 60 [email protected] kHz/70 dB@20/25 kHz ETSI 60 [email protected] kHz/70 dB@20/25 kHz Spurious Response Rejection TIA- 603 70 [email protected]/20/25 kHz ETSI 70 [email protected]/20/25 kHz Intermodulation TIA- 603 70 [email protected]/20/25 kHz ETSI 65 [email protected]/20/25 kHz Conducted Emission < – 57 dBm Blocking TIA- 603 80 dB ETSI 84 dB Rated Audio Distortion ≤ 3%

UHF (400– 470 MHz) Specifications 9 Humidity, Shock & Vibration GJB150A-2009: MIL-STD-810 G All specifications are tested according to applicable standards, and subject to change without notice due to continuous technological development.

Circuit Description UHF (400– 470 MHz) 10

5. Circuit Description 5.1 Baseband Section

5.1.1 Power Supply Module

FGU

BAT

Charge U 2506 TYPE_C VSYS （ 1800 mA） BAT

DCDC U 2002 Audio PA U 3010 LDO U 2014 3 V 6 D ( 1200 mA) MIC 3 V 3 A_MIC ULDO 2013 5 VA_FGU POWER_ON PWR_KEY POWER_ON RF PA Q 1 D 1 VBUS D 2 Power on LDO U 2008 RX 3 V 3 A_RX LDO U 2009 PLL 3 V 3 A_FGU TX LDO^3 V^3 A_TX U 2011 TX_EN FGU_EN LDO U 2020 BT 3 V 3 D_BT 2000 mA 2000 mA LDO U 2499 3 VA_ADC A 7 52 M Crystal Oscillator Pull up 3 V 3 A 3 V 3 D Accessory Connector/ Temperature Detection VBUS The power supply module employs two 7.4 V Li-ion batteries. The 7.4 V voltage powers the RF board and baseband board in the following ways:

RF Board

 The LDO converts the 7.4 V voltage into a 5.0 V voltage, which powers the VCO circuit.  The DC/DC (U2002) converts the 7.4 V voltage into a 3.6 V voltage. Then the LDOs (U2011, U2008, and U2009) regulate the 3.6 V voltage into 3.3 V voltages, which power the PLL circuit, RX circuit, and TX circuit.

Baseband Board

 The DC/DC (U2002) converts the 7.4 V voltage into a 3.6 V voltage.  The LDOs (U2014, U2020, and U2499) convert the 3.6 V voltage into 3.3 V voltages, which power the MIC, BT, and accessory connector/temperature detection modules.

Circuit Description UHF (400– 470 MHz) 12

5.1.3 Audio Module

DSP TPA 3131 VOP VON AU_AUXMIC_N RF UNIT BT AU_RCVP MICLP ANT SPKRN BT_SPKP INT_MICP HPR MICLN SPKRP BT_SPKN INT_MICN EXT_MICP EXT_MICN AU_MIC_P AU_MIC_N AU_RCVN AU_AUXMIC_P MIC Speaker 3 W/ 8 Ω EXT_SPK Green：Transmit Path Blue：Receive Path AIF BT_SPKP BT_SPKN BT_MICP BT_MICN INP INN BT_MICP BT_MICN Codec (Built-in A 7 ) The audio module consists of the Codec (built-in A7), class D audio power amplifier (PA) (U3010), BT module (U9504), microphone, analog switch circuit, and internal and external speakers.

Audio Path

 RX Path The audio signal received from the RF section is processed by the A7 DSP, goes to the codec module through the audio interface for gain adjustment and D-A conversion, and then is output through AU_RCV. Then the audio signal goes to the internal or external speaker through the analog switch circuit, amplified by the PA chip, and is finally output. Or the audio signal can also be output to the BT chip (U9504) for processing, and then transmitted to the BT earpiece through RF modulation.  TX Path  (^) Internal Audio The internal audio from two microphones goes to the codec module for A-D conversion, and then to the DSP for noise reduction, and finally transmitted through RF modulation.  (^) BT/External Audio The BT/external audio signal goes to the codec module for amplification and A-D conversion, and then to the DSP for processing, and finally transmitted through RF modulation.

UHF (400– 470 MHz) Circuit Description 13

Audio Power Amplifier

The table below lists the main parameters of the audio amplifier. Parameter Value Rated power (Po) 1 W Maximum power (Pmax) 3.5 W Speaker Impedance (RL) 8 Ω 5.2 RF Section

5.2.1 TX Circuit

ANT TX VCO Resistor^ Sampling Drive-stage Final-stage PA Match Tx/Rx Switch LPF APC/TV 1 To RX Pre-Driver V_BAT The TX circuit consists of the RF PA circuit, low-pass filter (LPF) circuit, automatic power control (APC) circuit, and so on.

RF PA Circuit

The carrier signal generated by the TX VCO goes to the pre-driver PA for initial amplification, the drive-stage PA for further amplification, and then final-stage PA for final amplification. The amplified carrier signal then passes through the microstrip matcher for output impedance matching, so as to reduce output power loss due to impedance mismatch.

LPF Circuit

After the output impedance matching, the signal goes to the TX/RX switch and then to the LPF for suppressing