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Denon DRM-550 Service Manual

Denon DRM-550
28 pages
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DENON
SERVICE
MANUAL
MODEL
DRM-550
STEREO
CASSETTE
TAPE
DECK
TABLE
OF
CONTENTS
OPERATING
INSTRUCTIONS...
DISASSEMBLY
INSTRUCTIONS
.
ADJUSTING
AND
CHECKING
THE
MECHANISM
SECTIO!
ADJUSTING
THE
CHECKING
THE
ELECTRICAL
SECTIONS.
BLOCK
DIAGRAM
LEVEL
DIAGRAM...
PARTS
LIST
OF
EXPLODED
VIEW
EXPLODED
VIEW
OF
CHASSIS
AND
CABINE
CASSETTE
MECHANISM
UNIT.........
KU-9336
AUDIO
P.W.B.
UNIT
ASS’'Y
KU-9337
DISPLAY
P.W.B.
UNIT
ASS'
KU-9338
POWER
P.W.B.
UNIT
ASS"
NOTE
FOR
PARTS
LIST...
PRINTED
WIRNING
BOARD
PARTS
LIS)
BUNDEL
DIAGRAM
WIRING
DIAGRAM
SCHEMATIC
DIAG!
SEMICONDUCTOR...
24,
2!
NIPPON
COLUMBIA
CO.
LTD.

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Denon DRM-550 Specifications

General IconGeneral
TypeCassette Deck
Track System4-track, 2-channel stereo
MotorDC servo motor
Noise ReductionDolby B
Tape Speed4.75 cm/s
Tape TypeCrO2, Metal
InputLine Level
Signal to Noise Ratio65dB (dolby B)

Summary

Important Safety Precautions

Safety Instructions Overview

Comprehensive guidelines for the safe operation, installation, and maintenance of the appliance.

Features

Names and Functions of Parts

Front Panel Controls and Indicators

Detailed explanation of the functions of buttons, knobs, and displays on the front panel.

Playback and Recording Operations

Recording Procedure

Instructions for recording audio onto cassette tapes, including Dolby NR and MPX filter use.

Advanced Recording and Tape Management

Special Features and Systems

Dolby Noise Reduction Systems

Details on Dolby B and C noise reduction and HX-Pro headroom extension.

Maintenance and Troubleshooting

Routine Maintenance Procedures

Steps for cleaning and demagnetizing heads, pinch rollers, and capstans.

Troubleshooting Guide

Common problems and their solutions for the cassette deck.

Technical Specifications

Disassembly Instructions

Mechanism Section Adjustments and Checks

Pinch Roller and Head Replacement

Procedures for replacing the pinch roller and the record/playback/erase heads.

Tape Transport Torque and Time Checks

Verifying take-up torque, FF/REW torque, back tension, and FF/REW times.

Electrical Section Adjustments and Checks

Initial Adjustments and Tape Transport Check

Pre-adjustment cleaning, demagnetizing, and basic tape transport verification.

Azimuth and Tape Speed Adjustment

Adjusting head azimuth for optimal playback and setting the correct tape speed.

Playback and Recording Section Adjustments

Playback Gain and Characteristics Adjustment

Setting playback gain to a specific voltage and ensuring characteristic conformity.

Recording Level and Frequency Response

Adjusting recording levels and frequency response for different tape types and Dolby NR.

Parts List and Exploded View

Parts List for Components

Detailed listing of part numbers, names, and quantities for various assemblies.

Cassette Mechanism Unit Details

Printed Wiring Board Patterns

Wiring Diagram

Semiconductor Components

Transistor and Diode Information

Semiconductor Pin Assignments

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