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TANDBERG TR 2025 Service Manual

TANDBERG TR 2025
19 pages
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TANDBERG TR 2025 Specifications

General IconGeneral
Power output25 watts per channel into 8Ω (stereo)
Frequency response20Hz to 20kHz
Input sensitivity2.5mV (MM), 150mV (line)
Output150mV (line)
Speaker load impedance4Ω to 16Ω
Tuning rangeFM: 87.5-108 MHz
Signal to noise ratio85dB (line)

Summary

Switch Maintenance

Cleaning the Switches

Instructions for cleaning and lubricating push button switches for trouble-free action.

Dismantling Switches

Procedures for disassembling various types of switches: Independent, Interlocking, and Independent.

Mechanical Dismantling

Cabinet Removal

Steps to remove the cabinet top panel and side panels.

Dial Holder Removal

Procedure for removing the dial holder, including meter and lamp connections.

Front Plate Removal

Steps to remove the front plate, including knobs and front strip.

Output Transistor Installation

Thermal Compound Application

Guidance on applying thermal compound to mica washers for output transistors.

Cord Drive Mechanism

Cord Drive Service

Instructions for removing, fitting, and servicing the cord drive mechanism.

Setting the Tuning Pointer

Procedure for setting the dial pointer after cord drive assembly.

FM Alignment Procedures

FM Alignment Steps

Detailed steps for aligning the FM tuner using generator and oscilloscope.

Decoder Alignment Steps

Procedures for aligning the stereo decoder with a stereo generator.

FM Alignment Notes

FM Alignment Notes

Important notes regarding FM alignment, filter replacement, and decoder alignment.

Alternative FM Alignment Procedures

Alternative FM Alignment Methods

Alternative alignment procedures when specific test equipment is unavailable.

FM-IF + Decoder Circuit (TCA 4500)

TCA 4500 Component Layout

Component layout for the FM-IF and decoder board using TCA 4500 IC.

FM Tuning Fault Finding

FM Tuner Troubleshooting

Steps for fault finding in the FM tuner, including tuner lock and AGC lead.

FM Tuner Circuit Diagram (A1)

FM Tuner Board A1 Schematic

Schematic diagram for the FM tuner section (Board A1).

FM-IF + Decoder Circuit (MC 1310P)

MC 1310P Board A2 Schematic

Schematic diagram for the FM-IF and decoder board (MC 1310P IC).

FM-IF + Decoder Circuit - Solder Side

TCA 4500 Board Solder Side View

Solder-side view of the FM-IF and decoder board (TCA 4500 IC).

FM Tuner Troubleshooting

FM Tuner Fault Finding Steps

Troubleshooting steps for the FM tuner, including tuner lock and AGC lead.

FM Tuner Board Component Layout

FM Tuner Board A1 Component Layout

Component layout for the FM tuner section (Board A1).

FM-IF + Decoder Board (MC 1310P) Layout

MC 1310P Board A2 Component Layout

Component layout for the FM-IF and decoder board (MC 1310P IC).

FM Tuner Schematic Diagram

FM Tuner Board A1 Schematic

Detailed schematic diagram of the FM tuner board (A1).

FM-IF and Stereo Decoder Schematic Diagram

FM-IF Decoder Board A2 Schematic

Schematic diagram of the FM-IF and stereo decoder board (A2).

Signal Path Voltage Diagram

Diagram illustrating signal path voltages at various points in the circuit.

Decoder Circuit Schematics

TCA 4500 Decoder Schematic

Schematic diagram for the decoder circuit using TCA 4500 IC.

MC 1310P Decoder Schematic

Schematic diagram for the decoder circuit using MC 1310P IC.

Audio Output Stage Measurements

Left Channel Quiescent Current Measurement

Procedure for measuring quiescent current in the left channel AF output.

Right Channel Quiescent Current Measurement

Procedure for measuring quiescent current in the right channel AF output.

RIAA Input Amplifier Circuit

RIAA/Input Amplifier Schematic

Circuit diagram for the RIAA and input amplifier stages.

Power Amplifier Circuit Diagram

Power Amplifier Stage Schematic

Circuit diagram for the power amplifier section.

Audio Stage Component Layouts

Power Amplifier Component Layouts

Component layouts for the power amplifier (left and right channels).

RIAA/Input Amplifier Component Layout

Component layout for the RIAA/input amplifier stages.

AF Output Stage Component Layout

Component layout for the AF output stages.

Quiescent Current Adjustment

Quiescent Current Adjustment Procedure

Procedure for adjusting quiescent current in the amplifier channels.

Preamplifier Board (A6)

Preamplifier Board Component Layout

Component layout and wiring for the preamplifier board (A6).

Power Amp & Input Board (A5)

Power Amp/Input Board Component Layout

Component layout and wiring for the power amp and input circuit board (A5).

Tone Control Circuitry

Details of tone control components and their layout on the preamp board.

Dial Light Board Schematic

Pointer Dial Light Board Diagram

Circuit diagram and component layout for the pointer dial light board.

Mains Transformer Information

Mains Transformer Specifications and Wiring

Information about mains transformer part numbers and wiring configurations.

Power Amplifier & Input Circuit Board (A7)

Power Amp/Input Circuit Board Schematic

Circuit diagram for the power amp and input circuit board (A7).

Preamp Board Section Schematic

Schematic for a section of the preamplifier board.

Preamplifier Board (A6) Solder Side View

Preamplifier Board Solder Layout

Solder-side view of the preamplifier board (A6).

Power Amp & Input Board (A5) Solder Side View

Power Amp/Input Board Solder Layout

Solder-side view of the power amp and input circuit board (A5).

FM Aerial Connections

FM Aerial Installation Guide

Diagrams and specifications for connecting FM aerials.

Audio Input/Output Connector Details

DIN Plug Connections for Audio Devices

Details on DIN plugs for connecting record players, tape recorders, and headphones.

Technical Data and Specifications

Useful data including input sensitivity, impedance, and power consumption.

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