E.F. Johnson Company 761X Manuals

Manuals and User Guides for E.F. Johnson Company 761X. We have 1 E.F. Johnson Company 761X manual available for free PDF download: Service Manual

E.F. Johnson Company 761X Service Manual

E.F. Johnson Company 761X Service Manual (99 pages)

VHF-UHF Conventional Mobile FM TWO-WAY RADIO

Brand: E.F. Johnson Company | Category: Two-Way Radio | Size: 4.07 MB

Table of Contents

Table of Contents
3
1 General Information

6
- Scope of Manual
  6
- Transceiver Description
  6
  - General
    6
- Product Warranty
  6
- Part Number Breakdown
  6
- Transceiver Identification
  6
- Accessories
  6
- Factory Customer Service
  6
- Factory Returns
  7
- XX Accessories
  7
- Replacement Parts
  8
- Internet Home Page
  8
2 Installation and Disassembly

12
- General
  12
  - Scope of Instructions
    12
  - Performance Tests
    12
  - Transceiver Programming
    12
  - Power Source
    12
- Transceiver Installation
  12
  - Selecting Mounting Location
    12
- Installation Components
  12
  - Installing Mounting Bracket
    13
  - Installing Microphone Hanger
    13
- Power Cable Installation
  13
  - General
    13
  - Cable Installation
    13
- Mounting Bracket Installation
  13
  - Power Cable Fuses
    14
- Using an External Speaker
  14
- Accessory Cable Installation
  14
- Transceiver Disassembly
  15
- Installation
  
  15
  - Cover and Front Panel Removal
    15
  - PC Board Screws
    15
  - Removing PC Board
    15
    
    Installation Procedure
    16
    
    2-Tone Programming
    16
  - Tone Module Installation
    16
3 Operation

18
- Features
  18
- Front Panel
  18
- Controls and Display
  19
  - Front Panel Controls
    19
  - Display
    19
  - Back Panel
    19
- Basic Operation
  19
  - Turning Power on and off
    19
  - Entering a Password
    20
  - Volume Level Adjustment
    20
  - Power-On Menu
    20
  - Channel Selection
    20
  - Adjusting Squelch Level
    20
  - Bank Select
    21
  - Automatic Scan Enable
    21
  - Backlight On-Off
    21
  - Beep On-Off
    21
- Receiving and Placing Calls
  21
  - Introduction
    21
  - Receiving a Call
    21
  - Placing a Call
    21
  - Monitoring before Transmitting
    21
  - Time-Out Timer
    22
  - Introduction
    22
- Programmable Functions
  22
  - Backlight On-Off
    22
  - Bank Select
    22
  - Beep On-Off
    22
- Option Key Programmable Functions
  22
  - Call Guard Tone Select
    23
  - Channel Select
    23
  - DTMF Number Select
    23
  - Emergency Key
    23
  - Lock Key
    23
  - Monitor Mode Select
    23
  - Output Power Select
    23
  - Priority Channel Select
    23
  - Receive Attenuate
    23
  - Scan Select
    23
  - Scan List Programming
    24
  - Talk-Around Select
    24
  - 2-Tone Calling Features
    24
  - Wide/Narrow Band Select
    24
- Channel Scan
  24
  - Introduction
    24
  - Scan Lists
    24
  - Priority Channel Sampling
    25
4 Programming

26
- General
  
  26
  - Programming Setup
    26
  - Programming Cables
    26
  - Programming Software
    26
  - Starting the Program
    27
  - Special Keys and Functions
    27
  - Menu Flow
    27
    
    Introduction
    27
    
    File Menu
    27
    
    Screen Menu
    28
    
    Program Menu
    28
    
    Print Menu
    28
    
    Model Menu
    28
    
    Setup Menu
    29
  - Key and Display Assign Screen Description
    32
  - DTMF Autodial Screen Description
    34
  - Continuous Tone Screen Description
    35
  - Scan Function Screen Description
    35
  - Tone Code Channel Screen Description
    36
  - Common Screen Description
    38
  - Expert Screen Description
    39
  - Unique Pmr (European) Screens
    40
    
    General
    40
    
    Unique PMR Screens
    40
  - Cloning
    41
- Cloning (Programming One Transceiver with Another)
  
  41
  - Memory Channel Screen (PMR Models)
    42
5 Vhf (7610) Circuit Description

44
- Vhf Receiver Circuit
  44
  - Antenna Switching Circuit
    44
  - RF Circuit
    44
  - First Mixer and First if Circuits
    44
  - Second if and Demodulator Circuits
    44
  - Audio Amplifier Circuit
    45
  - Receiver Mute Circuit
    45
- Second if System IC3 (VHF)
  45
- Audio Switching and Amplifier Circuit (VHF)
  45
- Vhf Transmitter Circuit
  46
  - Microphone Amplifier Circuit
    46
  - Modulation Circuit
    46
  - Transmit Driver Circuit
    46
  - Power Amplifier Module
    46
  - APC Circuit
    47
- Vhf Pll Circuit
  47
  - PLL Circuit
    47
  - VCO Circuit
    48
- Vhf IC Pin Descriptions
  48
Uhf (7640) Circuit Description

50
- Uhf Receiver Circuit
  50
  - Antenna Switching Circuit
    50
  - RF Circuit
    50
  - First Mixer and First if Circuits
    50
  - Second if and Demodulator Circuits
    50
  - Audio Amplifier Circuit
    51
  - Receiver Mute Circuit
    51
- Second if System IC1 (UHF)
  51
- Audio Switching and Amplifier Circuit (UHF)
  51
- Uhf Transmitter Circuit
  52
  - Microphone Amplifier Circuit
    52
  - Modulation Circuit
    52
  - Transmit Driver Circuit
    52
  - Power Amplifier Module
    52
  - APC Circuit
    53
- Uhf Pll Circuit
  53
  - PLL Circuit
    53
  - VCO Circuit
    54
  - UHF Power Supply
    54
  - UHF CPU IC1 Port Allocation
    54
  - UHF I/O Expander IC12 (Main Unit)
    55
  - UHF Port Expander IC13 (Main Unit)
    55
6 Adjustment Procedure

56
- General
  
  56
- Suggested Test Equipment
  56
- Test Channels
  57
- Test Cable
  57
- Computer-Aided Tuning
  58
- VHF Test Frequencies
  58
- UHF Test Frequencies
  58
  - Reprogramming if EEPROM Is Replaced or Error Occurs
    59
- Preliminary Setup
  59
- Pll Adjustment (Vhf Models)
  59
- Transmitter Adjustments
  59
  - (Vhf Models)
    59
  - Reference Frequency
    59
  - Output Power Adjust
    60
  - FM Deviation Adjust
    60
  - DTCS Waveform Adjust
    61
- Receiver Adjustments
  61
  - Bandpass Filter Adjust
    61
  - Squelch Adjust
    61
  - Beep Tone Level
    62
- Pll Adjustment (Uhf Models)
  63
- Transmitter Adjustments
  63
  - (Uhf Models)
    63
  - Reference Frequency
    63
  - Output Power Adjust
    63
  - FM Deviation Adjust
    63
  - DTCS Waveform Adjust
    64
- Receiver Adjustments
  65
  - Bandpass Filter Adjust
    65
  - Squelch Adjust
    65
  - Beep Tone Level
    65
7 Parts List

66
- Main Unit
  66
- Main Unit
  73
- Front Unit
  83
- Chassis Parts
  85
- Exploded View
  87
- Main Unit
  92
- Front Unit
  98

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