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Kenwood TKR-820 Service Manual

Uhf desk-top repeater

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Service manual (96 pages)

Service manual (90 pages)

Table Of Contents

Table of Contents

Revised
Contents
Scope of the Manual
Ordering Replacement Parts
Personnel Safety
FCC Compliance and Type Numbers
Pre-Installation Considerations
Service
During Operation of Repeater
Planning the Installation
System Set-Up
Installation
Installing the EEPROM of Signaling Unit
Installing the Duplexer
Attaching the Rack-Mount Brackets (for EIA Racks)
Conversion
Modification of the DC Switching Circuit
Disassembly for Repair
How to Remove the Case
Disassembling the Transmitter/Receiver Section
How to Remove the Transmitter/Receiver Section
How to Remove the TX-RX Unit
How to Remove the Panel
Disassembling the Final Ass'y Unit
Disassembling the Sub-Panel
Disassembling the AVR Unit
Disassembling the AVR Unit (X43-3040-10)
How to Remove the AVR Unit (X43-3040-10) and the Electrolytic Capacitor
How to Remove the Power Transformer
TKR-820 Block Diagram
Circuit Description
Trensmitter Circuit
Receiver Circuit
Transmitter Block Diagram
Squelch Circuit
RX Frequency Synthesizer
TX Frequency Synthesizer
Microphone Amplifier
Reset Circuit
PLL and Modulation Circuit Block Diagram
Reset Circuit Block Diagram
EEPROM Programming
Signaling Unit
Takeover Switch
Decoder Operation
Accessory Connector
AVR Circuit
AVR Circuit Block Diagram
Semiconductor Data
JLC1075DW: PL System (TXPLL, RX PLL IC2)
M51943BML: Reset System (Signaling Unit IC2), Precision Reference (Display Unit IC2)
M5222FP: Electronic Attenuator (BPF/VCA IC3)
M57729UH-P, M57729SH-22, M57729L-22, M57729H-01-P: TX Power Amplifier (Final Unit IC1)
MB504F: Prescaler (TX PLL, RX PLL IC1)
MB3756: Voltage Regulator (TX-RX Unit IC2)
MC3361D: if System (if IC1)
93C46PI: EEPROM (Signaling Unit IC10, Display Unit IC2)
PC1242H: AF Power Amplifier (TX-RX Unit IC1)
PD75104G-604-1B: Microprocessor (Display Unit IC1)
Description of Components
Parts List
Disassembly
Packing
Adjustment
Test Equipment Required for Alignment
Signaling
Test Cable for Microphone Input
Adjustment Location
Adjustment Points
Bottom View
Front Panel View
Alignment
PC Board View/Circuit Diagram
Rx Pll: Z1, Tx Pll: Z4 (X58-3120-10)
Rx Vco: Z2 (X58-3150-XX) -10:K,M -11:K2,M2 -13: K3,M3 -14:K4,M4
Tx Vco: Z5 (X58-3460-XX) -10:K,M -11:K2,M2 -12: K3,M3 -13:K4,M4
MIC Amp: Z7 (X59-3210-10)
If: Z8 (X59-3220-10)
Bpf/Vca: Z9 (X59-3230-10)
AVR Unit (X43-3040-10)
Final Unit (X45-3250-10)
Final Unit (X45-3250-XX) -10:K,M -11:K2,M2 -12:K3,M3 -13:K4,M4
Signaling Unit (X52-3140-10)
Display Unit (X54-3070-11)
TX-RX Unit (X57-3270-10)
TX-RX Unit (X57-3270-XX)10:K,M -11:K2,M2 -12: K3,M3 -13:K4,M4
Signaling Circuit Diagram
Signaling Circuit Diagram (S/No. 104XXXXX)
Schematic Diagram
Schematic Diagram (S/No. 104XXXXX)
Terminal Functions
KMC-9 (Base Microphone)
Chassis Removal
Removal of Microphone Element and Microphone Amplification Unit
External View
Switch Unit Removal
Removing Microphone Plug
Circuit Diagram
Specifications

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1 System Set-Up
2 Specifications
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Kenwood TKR-820 Service Manual

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