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Marantz 1090 Service Manual

Marantz 1090
32 pages
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Marantz 1090 Specifications

General IconGeneral
Power Output45 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.1%
Input Sensitivity2.5mV (MM), 150mV (line)
Damping Factor45
Speaker Load Impedance4Ω to 16Ω

Summary

1. INTRODUCTION

2. PRE-AMPLIFIER

3. MAIN AMPLIFIER

4. TROUBLESHOOTING ANALYSIS

Excessive Line Consumption

Checks for shorted transistors and open components causing high line current.

Zero Bias Voltage Issues

Troubleshooting steps for zero bias voltage and line consumption.

High Hum and Noise Level

Checks filter capacitors for issues causing high hum and noise.

Parasitic Oscillation

Checks specific capacitors for parasitic oscillation problems.

5. POWER AMPLIFIER ADJUSTMENT

Idling Current Adjustment

Procedure for adjusting idling current using a vacuum voltmeter.

7. PERFORMANCE VERIFICATION

Test Equipment for Performance Verification

Specifies test equipment needed for performance verification.

Preliminary Test Procedures

Details initial setup steps for performance testing.

Total Hum and Noise Test

Maximum Power Output Test

Harmonic Distortion Test Procedure

8. VOLTAGE CONVERSION

Voltage Conversion Chart and Procedure

Illustrates plug positions for different voltage settings.

9. MAJOR COMPONENT LOCATIONS

Front Panel Component Locations

Diagrams and labels for front panel components and adjustments.

Main Chassis Top View Component Locations

Identifies major components on the top side of the main chassis.

9. MAJOR COMPONENT LOCATIONS

Rear Panel Component Locations

Identifies components and connection points on the rear panel.

Main Chassis Bottom View Component Locations

Identifies major components on the bottom side of the main chassis.

10. DIAGRAM AND COMPONENT LOCATIONS

Tone Component Assembly Schematic

Schematic and component layout for the tone control assembly.

10. DIAGRAM AND COMPONENT LOCATIONS

LED Lamp Assembly Schematic

Schematic and component layout for the LED lamp assembly.

Loudness Assembly Schematic

Schematic and component layout for the loudness assembly.

Volume Assembly Schematic

Schematic and component layout for the volume control assembly.

10. DIAGRAM AND COMPONENT LOCATIONS

Main Amplifier (P700) Schematic

Schematic and component layout for the main amplifier assembly (P700).

10. DIAGRAM AND COMPONENT LOCATIONS

Rear Panel Assembly Schematic

Schematic and component layout for the rear panel assembly (PV00).

Speaker Switch Assembly Schematic

Schematic and component layout for the speaker switch assembly (PS00).

10. DIAGRAM AND COMPONENT LOCATIONS

Pre-Amp. Assembly (P400) Schematic

Schematic and component layout for the pre-amplifier assembly (P400).

10. DIAGRAM AND COMPONENT LOCATIONS

Main Amp. Assembly (P700) Schematic

Schematic and component layout for the main amplifier assembly (P700).

11. CONNECTION DIAGRAM

12. SCHEMATIC DIAGRAM

13. EXPLODED MECHANICAL DIAGRAM

13. EXPLODED MECHANICAL DIAGRAM

Rear Panel Exploded View (USA/Canada)

Exploded view of the rear panel for US and Canadian models.

Rear Panel Exploded View (Europe)

Exploded view of the rear panel for European models.

14. PACKING MATERIAL EXPLODED VIEW

15. BLOCK DIAGRAM

15. PARTS LIST

17. TECHNICAL SPECIFICATIONS

USA Model Specifications

Technical specifications for the amplifier's U.S.A. model.

Amplifier Section (USA)

Detailed specifications for the amplifier's audio output and performance.

Pre-Amplifier Section (USA)

Specifications related to the pre-amplifier section for the USA model.

General Specifications (USA)

General specifications including power, dimensions, and weight for the USA model.

European Model Specifications

Audio Section (Europe)

Audio performance specifications for the European model.

General Specifications (Europe)

General specifications for the European model.

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