QUANTUN XMHQP-750U Manuals

Manuals and User Guides for QUANTUN XMHQP-750U. We have 1 QUANTUN XMHQP-750U manual available for free PDF download: Service Manual

Quantun XMHQP-750U Service Manual

Quantun XMHQP-750U Service Manual (79 pages)

Brand: Quantun | Category: Radio | Size: 1 MB

Table of Contents

Table of Contents
3
Chapter 1 Test Equipment, Service Aids, and Service Tool

6
- Test Equipment
  6
- Service Aids
  6
- Model
  7
Chapter 2 Realignment

8
- Getting Acquainted
  8
- Radio Modes
  9
  - User Mode
    9
  - All Reset Mode
    9
  - Wireless Clone Mode
    9
  - User Wired Clone Mode
    9
  - Manual Adjust Mode
    10
  - PC Adjust Mode
    11
- Adjustment Description
  11
  - Required Test Instrument
    11
  - 2Adjustment
    12
Chapter 3 Disassembly and Assembly

15
- Disassemble the Radio
  15
  - Remove the Battery
    15
  - Remove the Antenna
    15
  - Remove the Knob
    16
  - Separate the Chassis from PCB
    16
  - Remove the Main PCB
    16
  - Disassemble PTT Key
    17
- Assemble the Radio
  18
  - Attach PTT
    18
  - Assemble the Chassis and PCB
    18
  - Attach the Battery
    19
Chapter 4 Mechanical View and Parts List

20
- Exploded View
  20
- QP-750 Part List
  21
- DC Power Distribution
  22
  - DC Regulation and Distribution
    22
Chapter 5 DC Power Distribution

22
Chapter 6 Controller Theory of Operation

24
- Controller
  24
- Microprocessor Circuitry
  24
- Audio Circuitry
  29
  - Audio Power Amplifier
    30
  - Internal Microphone Audio Voice Path
    30
  - PTT Circuits
    30
  - VOX Operation
    30
  - Programming and Flashing through Microphone Jack
    31
- QP-750 Service Manual
  24
Chapter 7 UHF Theory of Operation

31
- Introduction
  31
- UHF Receiver
  31
  - Receiver Front-End
    31
  - Receiver Back-End
    32
  - Narrowband/Wideband Switch Circuit
    32
  - UHF Transmitter
    32
    
    AF and Signaling
    32
    
    RF Power Amplifier
    32
    
    Antenna Switch and Harmonic Filter
    32
    
    Apc
    32
  - PLL Frequency Synthesizer
    34
    
    PLL Circuit
    34
    
    Vco
    35
    
    Unlock Detector
    35
  - Base Band and Signaling System
    35
    
    Ctc/CDC
    36
    
    DTMF / 2-Tone
    36
    
    Msk
    36
Chapter 8 UHF Troubleshooting Tables

37
- Troubleshooting for CPU
  37
- Troubleshooting for VCO
  38
- Troubleshooting for Receive
  40
Chapter 9 UHF Schematic Diagrams, Layout, Parts Lists

41
- Introduction
  41
- QP-750 Block Diagrams
  42
- QP-750 UHF Schematic Diagrams
  43
  - QP-750 RF Section
    43
  - QP-750 VCO Section
    44
  - QP-750 PLL Section
    45
  - QP-750 AF Section
    47
  - QP-750 Controller Section
    48
- QP-750 UHF PCB Layout
  49
- QP-750 (450-470Mhz) Parts List
  53

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