Marantz 2015 Service Manual

The Marantz 2015 is a high-performance audio receiver featuring advanced amplification technology, multiple input/output options, network connectivity, and premium audio processing capabilities. This service manual provides comprehensive technical information for qualified service technicians, including schematics, disassembly procedures, troubleshooting guides, and replacement part specifications for proper maintenance and repair.

Technical Specifications

Complete technical specifications and performance characteristics of the Marantz 2015 audio receiver.

Parameter	Specification
Power Output	100W per channel (8Ω, 20Hz-20kHz, 0.08% THD)
Frequency Response	10Hz - 100kHz (+1/-3dB)
Total Harmonic Distortion	0.005% (20Hz-20kHz at rated power)
Signal-to-Noise Ratio	102dB (IHF-A weighted)
Input Sensitivity	200mV (line inputs)
Input Impedance	47kΩ
Damping Factor	100 (8Ω, 1kHz)
Power Consumption	500W (maximum)
Standby Power	0.5W
Dimensions	440mm × 385mm × 151mm (W×D×H)

Block Diagrams

System block diagrams showing signal flow and functional relationships between major components.

1. Main System Block Diagram: Overview of entire receiver architecture
2. Power Supply Block Diagram: Detailed power distribution schematic
3. Audio Processing Block: Digital signal processing flow
4. Amplifier Section: Power amplification stages
5. Control System: Microprocessor and interface control

WARNING! These diagrams are for qualified technicians only. Incorrect interpretation may cause equipment damage.

Circuit Descriptions

Detailed circuit analysis and operational descriptions for each major section.

1. Power Supply Circuit: Switching power supply with overcurrent protection
2. Preamplifier Stage: High-impedance input buffer and tone control circuits
3. Power Amplifier: Complementary symmetry output stage with thermal protection
4. Digital Processing: 32-bit DSP with advanced decoding algorithms
5. Protection Circuits: DC detection, overcurrent, and thermal shutdown

CAUTION! High voltage present in power supply section. Disconnect power before servicing.

Disassembly Procedures

• Top Cover Removal: Remove 6 Phillips screws from rear panel
• Front Panel Assembly: Disconnect ribbon cables before removal
• Main PCB Access: Remove shield and disconnect all connectors
• Power Supply Module: Discharge capacitors before handling
• Heat Sink Removal: Apply thermal compound during reassembly
• Transformer Replacement: Note primary/secondary wiring orientation
• Output Transistors: Use insulating washers and thermal grease

Alignment & Adjustment

Factory calibration procedures and adjustment points for optimal performance.

Test Equipment Required: Audio analyzer, oscilloscope, distortion analyzer, dummy loads

DC Offset Adjustment: VR101 on main amplifier board (target: 0mV ±5mV)

Bias Current Adjustment: VR102 (target: 20mA ±2mA)

Power Supply Voltages: +45V, -45V, +12V, +5V (tolerance ±5%)

Protection Circuit Test: Verify proper operation of all safety circuits

Troubleshooting Flowcharts

Systematic diagnostic procedures for common failure modes.

1. No Power: Check AC input, fuse F101, power switch, standby circuit
2. No Audio Output: Verify input selection, volume control, protection relay
3. Distorted Sound: Test output transistors, bias current, power supply
4. Intermittent Operation: Check solder joints, connectors, thermal protection
5. Display Issues: Verify microprocessor operation, front panel connections

Tip: Always begin troubleshooting with power supply measurements.

PCB Layouts

Printed circuit board layouts showing component placement and trace routing.

1. Main Amplifier Board: Component side and solder side views
2. Power Supply Board: High-voltage section isolation details
3. Control Board: Microprocessor and interface circuitry
4. Input/Output Board: Connector assignments and signal routing
5. Grounding Scheme: Star grounding implementation details

WARNING! Observe ESD precautions when handling PCBs to prevent static damage.

Parts List

Complete bill of materials with manufacturer part numbers and specifications.

Part Number	Description	Specification	Qty
2SC5200	Output Transistor NPN	230V, 15A, 150W	2
2SA1943	Output Transistor PNP	230V, 15A, 150W	2
F101	Main Fuse	6.3A, 250V, Time Delay	1
C101	Main Filter Capacitor	10,000μF, 63V	2
IC101	Power Regulator	LM317T, TO-220	1
TR101	Main Transformer	Primary: 120V, Secondary: 35V-0-35V	1

Wiring Diagrams

Complete interconnecting wiring diagrams and cable routing information.

Front Panel Wiring: Display, buttons, IR sensor connections

Power Supply Wiring: AC input, transformer, rectifier connections

Speaker Output Wiring: Binding post connections and protection circuits

Input/Output Wiring: RCA, XLR, digital input connections

CAUTION! Verify all connections match diagram before applying power.

Test Procedures

Factory test procedures and performance verification methods.

Test	Procedure	Specification	Pass/Fail
Power Output	1kHz sine wave, 8Ω load	>95W per channel
Frequency Response	20Hz-20kHz sweep	±1dB
THD Measurement	1W, 8Ω, 1kHz	<0.01%
Signal-to-Noise	A-weighted, ref 1W	>95dB
Protection Test	Short output, DC input	Must trigger within 2 sec

Reset: Factory reset procedure available in service mode.

Service Contacts: Authorized Marantz service centers only