Motorola M120

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Revision Details2
Attachments2
Parts List5
Schematic Diagram for HLD8265A and HLD8266A VHF RF Boards, 136-162 Mhz12
Circuit Board Details for HLD8265A and HLD8266A VHF RF Boards, 136-162 Mhz13
Circuit Board Details and Schematic for HDL8293A VHF Power Amplifier, 136-162 Mhz, 10-25 Watts14
Circuit Board Details and Schematic for HLE8385A UHF Power Amplifier, 403-433 Mhz, 1-10 Watts15
Instructions for Expanded Accessory Connector16
Extracting a Terminal16
Inserting a Pin16
Accessory Connector, Rear View16
M120 Radio Accessory Connector Table17
Table of Contents18
How to Use this Manual20
Ordering Replacement Parts20
M120 VHF Mobile Radio 146 - 174 Mhz 1 - 10 Watts RF Power21
M120 VHF Mobile Radio 146 - 174 Mhz 10 - 25 Watts RF Power22
M120 VHF Mobile Radio 146 - 174 Mhz 25 - 45 Watts RF Power23
M120 VHF Mobile Radio 403 - 433 Mhz 25 - 40 Watts RF Power24
M120 UHF Mobile Radio 438 - 470 Mhz 1 - 10 Watts RF Power25
M120 UHF Mobile Radio 438 - 470 Mhz 10 - 25 Watts RF Power26
M120 UHF Mobile Radio 438 - 470 Mhz 25 - 40 Watts RF Power27
M120 UHF Mobile Radio 465 - 495 Mhz 25 - 40 Watts RF Power28
M120 UHF Mobile Radio 490 - 520 Mhz 25 - 35 Watts RF Power29
Accessories List30
Specifications32
Disassemble Radio33
Remove Control Head and Chassis Covers33
Remove RF Chassis Shield33
Remove PA Heatsink33
Remove RF Circuit Board/Logic Circuit Board/Pa Circuit Board34
Assembly Radio34
Align Circuits36
Program Radio36
Recommended Test Equipment36
Replace and Calibrate Logic Board36
Theory of Operation37
RF Board37
VHF Receiver Front End, 146-174 Mhz37
UHF Receiver Front End/Characteristics of Resonator Filter37
Receiver Back End38
Receiver IC Block Diagram38
Frequency Synthesizer39
Synthesizer Section Block Diagram40
Charge Pump41
Loop Filter41
Reference Oscillator41
Vcos and Buffers41
Logic Board42
DC Distribution and Regulation42
Microcomputer and Logic43
Receiver Audio43
Voice Path43
Microcomputer Start-Up Routine/Programmable I/O43
Transmitter Audio44
Transmitter Power Control44
Voice/Data Path44
Control Line Functions44
RF Power Amplifiers45
Power Control Operation45
1-10 Watt VHF Power Amplifier45
10-25 Watt VHF Power Amplifier46
25-45 Watt VHF Power Amplifier46
1-10 Watt UHF Power Amplifier46
10-25 Watt UHF Power Amplifier47
25-35/40 Watt UHF Power Amplifier47
Front Panel Boards48
Display Board48
VOL/MIC Board48
Front Panel Filter Board48
Jumper-Selectable Options49
Jumper Positions49
Non-Field-Serviceable Components50
Operation of the Reference Oscillator50
Schematic Diagram for HDL8029A and HDL8031A VHF RF Boards, 146-174 Mhz52
Circuit Board Details for HDL8029A and HDL8031A VHF RF Boards, 146-174 Mhz53
Schematic Diagram for HLE8229A and HLE8230A UHF RF Boards, 403-433 Mhz54
Circuit Board Details for HLE8229A and HLE8230A UHF RF Boards, 403-433 Mhz55
Schematic Diagram for HLN8074E Masked Logic Board (2-Layer) (Sheet 1 of 2)56
Schematic Diagram for HLN8074E Masked Logic Board (2-Layer) (Sheet 2 of 2)57
Service Manual Revision58
Schematic Diagram for HLE8300A and HLE8301A UHF RF Boards, 438-470 Mhz59
Circuit Board Details for HLE8300A and HLE8301A UHF RF Boards, 438-470 Mhz60
Circuit Board Details for HLN8074E Masked Logic Board (2 Layer)61
2-Layer Logic Parts List62
Switchboard Shown from Component Side65
Schematic Diagram for HLE8263A and HLE8264A VHF RF Boards, 465-495 Mhz66
Circuit Board Details for HLE8263A and HLE8264A VHF RF Boards, 465-495 Mhz67
Schematic Diagram for HLE8227A and HLE8228A UHF RF Boards, 490-520 Mhz68
Circuit Board Details for HLE8227A and HLE8228A UHF RF Boards, 490-520 Mhz69
Schematic Diagram for HLN8074B Masked Logic Board (2-Layer) (Shit 1 of 2)70
Schematic Diagram for HLN8074B Masked Logic Board (2-Layer) (Shit 2 of 2)71
Circuit Board Details for HLN8074B Masked Logic Board (2-Layer)72
Circuit Board Details and Schematic for HDL8299A VHF Power Amplifier, 146-174 Mhz, 1-10 Watt73
Circuit Board Details and Schematic for HDL8033A VHF Power Amplifier, 146-174 Mhz, 10-25 Watt74
Circuit Board Details and Schematic for HDL8287A VHF Power Amplifier, 146-174 Mhz, 25-45 Watts75
Circuit Board Details and Schematic for HLE8275A UHF Power Amplifier, 404-433 Mhz, 25-40 Watts76
Circuit Board Details and Schematic for HLE8267A UHF Power Amplifier, 438-470 Mhz, 1-10 Watts77
Circuit Board Details and Schematic for HLE8034A UHF Power Amplifier, 438-470 Mhz, 10-25 Watts78
Circuit Board Details and Schematic for HLE8271A UHF Power Amplifier, 438-470 Mhz, 25-40 Watts79
Circuit Board Details and Schematic for HLE8284A UHF Power Amplifier, 465-495 Mhz, 25-40 Watts80
Circuit Board Details and Schematic for HLE8269A UHF Power Amplifier, 490-520 Mhz, 25-35 Watts81
Circuit Board Details, Schematic and Parts List for Front Panel Filter Board (01-80704Y83)82
Circuit Board Details, Schematic and Parts List for HLN8439A Display Board, 2 Frequency83
Circuit Board Details, Schematic and Parts List for HLN8071A Volume/Microphone Board84
Exploded View, Schematic, Circuit Board Detail, and Parts List for Microphone85
Exploded Mechanical View and Parts List for M120 Mobile Radios86
RF 146-174 Mhz Parts List87
RF 403-433 Mhz Parts List90
RF 438-470 Mhz Parts List94
RF 465-495 Mhz Parts List98
RF 490-520 Mhz Parts List102
HLN8074B Logic Board 2-Layer Masked Parts List106
PA 146-174 Mhz (1-10W) Parts List109
PA 146-174 Mhz (10-25W) Parts List111
PA 146-174 Mhz (25-45W) Parts List113
PA 403-433 Mhz (25/40W) Parts List115
PA 438-470 Mhz (1-10W) Parts List117
PA 438-470 Mhz (10-25W) Parts List119
PA 438-470 Mhz (25/40W) Parts List121
PA 465-495 Mhz (25/40W) Parts List124
PA 490-520 Mhz (25/35W) Parts List126
Service Manual Revision (More)128

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