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Denon DR-M22 Service Manual

Denon DR-M22
31 pages
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DENON
SERVICE
MANUAL
Hi-Fi
Component
STEREO
CASSETTE
TAPE
DECK
Mope.
—_—ODR-M22
NIPPON
COLUMBIA
CO.
LTD.

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Denon DR-M22 Specifications

General IconGeneral
TypeCassette Deck
Track System4-track, 2-channel stereo
Tape Speed4.76 cm/s
Heads1 x record/playback, 1 x erase
Tape TypeCrO2, Metal
Noise ReductionDolby B
OutputLine
Inputs1 x RCA
Outputs1 x RCA
Signal to Noise Ratio72dB (Dolby C)

Summary

Specifications

WARNINGS: Component Parts and Leakage Current

Safety warnings regarding component replacement and leakage current testing.

System Diagrams

Block Diagram

Overall functional block diagram of the cassette deck.

Level Diagram

Signal level flow diagram for playback and recording systems.

Component Identification and Functions

POWER switch

Controls AC power to the deck.

TIMER switch

For use with optional audio timer for unattended recording/playback.

EJECT button

Press to eject cassette. Stop tape first if operating.

Cassette compartment cover

Must be closed for transport controls to operate.

TAPE COUNTER

Four-digit readout indicating tape count position.

DOLBY NR switches

Activates/deactivates Dolby NR and selects B/C type.

MONITOR switch

Selects SOURCE or TAPE monitoring.

BIAS FINE ADJ control

Adjusts bias for NORMAL and CrO2 tape.

FLUORESCENT PEAK METERS

Indicate recording or playback peak levels.

TAPE SELECT indicator

Indicates tape type selected by Auto Tape Select.

OUTPUT LEVEL control

Adjusts playback, recording monitor, and headphone levels.

NR SYSTEM indicator

Informs Dolby NR status (B or C type).

MONITOR indicator

Informs selected monitoring source (TAPE or SOURCE).

INPUT LEVEL controls

Adjust recording levels for each channel.

PHONES jack

For private listening or monitoring via headphones.

COUNTER RESET button

Resets the tape counter to zero.

MEMORY STOP button

Stops tape at '0000' counter point during rewind.

Tape transport controls

Detailed explanation of all tape transport operational keys.

Mechanism Operation and Control

Mechanism Control Microcomputer Overview

Explanation of the microcomputer's role in controlling the tape deck mechanism.

Disassembly Instructions

Step-by-step guide for disassembling various parts of the cassette deck.

Maintenance and Adjustments

Mechanism Section Adjustments and Checks

Procedures for adjusting and checking mechanical parts like pinch rollers and heads.

Electrical Section Adjustments

Procedures for adjusting electrical components and overall frequency response.

Circuit Diagrams and P.W. Boards

Schematic Diagram - Power and Logic Unit

Circuit diagram for the power supply and logic control sections.

P.W. Board - Power and Logic Unit

Printed wiring board layout for the power and logic unit.

Schematic Diagram - Audio Amp Unit

Circuit diagram for the audio amplification stage.

P.W. Board - Audio Amp Unit

Printed wiring board layout for the audio amplifier unit.

Schematic Diagram - Counter Meter Unit

Circuit diagram for the tape counter and meter display units.

P.W. Board - Counter Meter Unit

Printed wiring board layout for the counter meter unit.

Schematic Diagram - Control Unit

Circuit diagram for the main control functions.

Exploded Views

Exploded View of Mechanism 85 Unit

Visual breakdown of the cassette mechanism components.

Exploded View of Cabinet and Chassis Group

Visual breakdown of the external cabinet and chassis assembly.

Parts Lists

Parts List - KU-5350 AUDIO UNIT

Component list for the KU-5350 Audio Unit.

Parts List - Mechanism 85 Unit

Component list for the Mechanism 85 Unit.

Parts List - Counter/Meter Unit

Component list for the KU-5371 Counter/Meter Unit.

Parts List - Mechanism P.W.B Unit

Component list for the KU-5100 Mechanism P.W.B Unit.

Parts List - Exploded View

Parts related to carton case packaging.

Parts List - Power and Logic Unit

Component list for the KU-5361 Power and Logic Unit.

Wiring and Connections

P.W. Board Connections Diagram

Diagram illustrating all P.W. board interconnections and external component wiring.

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