Table Of Contents - Kenwood TK-790 Service Manual

Table of Contents

Contents / General2
Ordering Replacement Parts2
Personnel Safety2
Table Of Contents2
Pre-Installation Considerations3
Unpacking3
Pre-Installation Checkout3
Planning The Installation3
General3
System Set-Up4
Before Reading About System Set-Up4
Operating Features5
Controls And Functions5
Basic Function Panel5
Full Function Panel5
Microphone7
Receive7
Transmit7
Scan Operation7
Adding Channels And Groups To The Scan Sequence8
Deleting Channels And Groups From The Scan Sequence8
Operator Selectable Priority8
Talk Around (Ta)8
Public Address (Pa)9
Speaker Internal/External (Sp)9
Channel Name (An)9
Intercom (Ic)9
Option Board (Opt)10
Aux A, Aux B, Aux C10
Direct Channel Access10
Channel Recall (Rcl)10
Busy Channel Lockout (Bcl), Bcl Override11
2Tone Signalling11
Dtmf Signalling11
Time Out Timer11
Minimum Volume12
Dead Beat Disable (Dbd)12
Ani Board12
Accessory Programmable Function Port (Pf Port)12
Msk Ptt Id13
Power On Text13
Data Programming (Pc Mode)13
Mode13
How To Enter Each Mode14
Pc Tuning Mode14
Clone Modes15
To Enter The Clone Mode And Connect Transceivers15
All Clone15
Group Clone15
Installation16
Front Panel Kit (Kch-10, Kch-11)16
Connection With Tk-790(B)/H(B)16
Install The Accessory Knobs16
Optional Voice Scrambler Function17
Optional Ani Function17
Code Setting17
Voice Scrambler Board Connection17
Ignition Sense Cable (Kct-18)18
External Speaker (Kes-4)18
Ignition Function18
Timed Power Off Function18
Connection For The Kes-4 With The Tk-79019
Connection For The Kes-4 With The Remote Kit19
Modification Of Plug (12-Pin)19
If The Kch-10 Is Used19
Accessory Terminal Function20
Horn Alert Function20
Modification To Increase The Audio Output Of The Control Head20
Use As Public Address Speaker20
Disassembly For Repair (Tk-790/(B))22
Removing The Case And Shield Cover22
Removing The Tx-Rx Unit22
Removing The Final Unit22
Removing The Tx-Rx Unit (X57-561 A/3)23
Removing The Final Unit (X45-356)23
Disassembly For Repair23
Removing The Control Unit (X57-561 B/3)24
Removing The Accessory Connector On The Rear24
Disassembly Of The Display Unit25
Circuit Description26
Transmitter Circuit26
Microphone Amplifier Section (X57 B/3)26
Modulation Section (X57 A/3)26
Receiver Circuit27
Double Balanced Mixer27
Squelch Circuit28
Rx Bpf (L110~112)28
Vco/Pll Circuit28
Squelch And Rssi Voltage Vs Ant Input Level28
Control Circuit29
Signalling Circuit29
Memory Circuit29
Shift Register29
Display Unit30
Encoder30
Power Supply30
Dimmer Function30
Kch-1131
Kch-11 Block Diagram31
Semiconductor Data32
Terminal Function32
Shift Register 2 On Control Unit (Ic517)34
Shift Register On Tx-Rx (Ic201)34
Audio Power Amplifier34
Flash Rom : At29C020-90Ti (Control Unit Ic519)35
Power Amplifier : M68702H (Final Unit Ic1) Tk-790/(B) K Type35
Final Amplifier : 2Sc2782 (Final Unit Q6, Q7) Tk-790H(B)35
Description Of Components36
Control Unit (X57-5610-Xx) (B/3)37
Final Unit (X57-5610-Xx) (C/3)37
Display Unit (X54-3190-20) : Kch-1038
Display Unit (X54-3200-20) : Kch-1138
Parts List39
Exploded View (Tk-790/(B))57
Exploded View (Tk-790H(B))58
Exploded View (Kch-10)59
Exploded View (Kch-11)60
Packing (Tk-790/(B))61
Packing (Tk-790H(B))62
Packing (Kch-10)63
Packing (Kch-11)64
Adjustment65
Key Functions In Panel Test Mode And Panel Tune Mode65
Test Equipment Required For Alignment67
Mic Connector67
Test Cable For Microphone Input67
Test Cable For Speaker Output67
Adjustment Points68
Common Section69
Final Unit (X57-5610-Xx) (C/3) : Tk-790/(B)75
Tx-Rx Unit (X57-5610-Xx) (A/3)75
Wiring77
Pc Board Views78
Display Unit (X54-3190-20) Component Side View : Kch-1078
Display Unit (X54-3190-20) Foil Side View : Kch-1078
Display Unit (X54-3200-20) Component Side View : Kch-1179
Display Unit (X54-3200-20) Foil Side View : Kch-1179
Circuit Diagram80
Final Unit (X45-3560-10) Component Side View : Tk-790H(B)92
Block Diagram93
Specifications94
Applicable (Mil-Std)94