Marantz PM 11S2 Service Manual

The Marantz PM 11S2 is a high-end integrated amplifier featuring advanced audio circuitry, dual monaural construction, high-current power supply, HDAM modules, toroidal transformer, and extensive connectivity options. This service manual provides detailed technical information for qualified service personnel including schematics, alignment procedures, parts lists, and troubleshooting guidelines.

1. Technical Specifications 2. Block Diagrams 3. Circuit Descriptions 4. Disassembly Procedures 5. Alignment & Adjustment 6. Parts List 7. PCB Layouts 8. Schematics 9. Troubleshooting Guide 10. Safety Precautions 11. Service Notes

Technical Specifications

Complete technical specifications for the Marantz PM 11S2 integrated amplifier.

Parameter	Specification
Power Output	100W + 100W (8Ω), 200W + 200W (4Ω)
Frequency Response	5Hz - 100kHz (+0/-3dB)
Total Harmonic Distortion	0.005% (20Hz - 20kHz)
Input Sensitivity	200mV (LINE), 800μV (PHONO MM)
Signal-to-Noise Ratio	100dB (LINE), 87dB (PHONO MM)
Inputs	5 LINE, 1 PHONO (MM), 1 XLR
Outputs	2 Speaker pairs, 1 Pre-out, 1 Rec out
Power Consumption	490W (max), 65W (no signal)
Dimensions	440 × 463 × 176mm (W×D×H)
Weight	25.5kg

Block Diagrams

System block diagrams showing signal flow and power distribution.

Main System Block Diagram: Overview of entire amplifier architecture
Power Supply Block Diagram: Dual monaural power supply configuration
Pre-amplifier Block Diagram: HDAM-based preamp section
Power Amplifier Block Diagram: Current feedback power amp stage
Protection Circuit Block Diagram: DC detection and thermal protection

WARNING! For qualified service personnel only. High voltages present.

Circuit Descriptions

Detailed circuit analysis of major sections.

Power Supply Circuit: Dual toroidal transformers and regulation
Pre-amplifier Circuit: HDAM-SA2 modules and switching
Phono Equalizer: MM phono stage with HDAM
Power Amplifier: Current feedback topology with dual differential
Protection Circuit: Speaker protection and thermal management

CAUTION! Disconnect power before servicing. Use isolation transformer.

Disassembly Procedures

Top Cover Removal: Remove 8 screws from top panel
Front Panel Removal: Detach knobs and remove 6 front screws
Main Board Access: Remove bottom plate and shield
Power Supply Removal: Disconnect all wiring and transformer leads
Heat Sink Removal: Remove output transistors and thermal compound
Rear Panel Removal: Detach all connectors and terminal blocks

Alignment & Adjustment

Required test equipment: Audio analyzer, oscilloscope, distortion analyzer, multimeter.

DC Offset Adjustment: Adjust VR801/VR802 for 0mV ±5mV at speaker terminals

Bias Current Adjustment: Set VR803/VR804 for 20mA across emitter resistors

Phono Equalization: Verify RIAA curve compliance within ±0.5dB

Input Level Matching: Adjust input sensitivity for consistent gain

Parts List

Complete component listing with manufacturer part numbers.

Reference	Description	Part Number
T801/T802	Toroidal Transformer	PM11S2-TRF-001
Q801-Q808	Output Transistor 2SC5200/2SA1943	PM11S2-TRA-002
IC801/802	HDAM-SA2 Module	PM11S2-HDAM-003
C801-C804	Main Filter Capacitor 15000μF/63V	PM11S2-CAP-004
F801/F802	Main Fuse 6.3A Slow Blow	PM11S2-FUSE-005

PCB Layouts

Printed circuit board layouts and component placement diagrams.

Main Amplifier Board (PWB-801): Component side and solder side
Power Supply Board (PWB-802): Component placement and routing
Front Panel Board (PWB-803): Switch and display circuitry
Input Selector Board (PWB-804): Input switching relays
Protection Board (PWB-805): Protection circuit layout

Tip: Use original Marantz parts for replacements.

Schematics

Complete electrical schematics for all circuit sections.

Main Amplifier Schematic: Complete power amp circuit
Power Supply Schematic: Dual monaural power supply
Pre-amplifier Schematic: HDAM-based preamp stage
Phono Stage Schematic: Moving magnet equalizer
Protection Circuit Schematic: DC and thermal protection
Control Circuit Schematic: Microprocessor and switching

WARNING! High voltage circuits. Use proper safety procedures.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No power	Fuse blown, power switch	Check F801/F802; test power switch; verify AC input
No sound output	Protection circuit, output stage	Check protection relay; test output transistors; verify bias
Distorted sound	Bias current, damaged components	Adjust bias current; test output devices; check driver stage
DC offset high	Input stage imbalance	Adjust DC offset; check differential pair; replace input transistors
Overheating	Bias current, thermal compound	Verify bias setting; renew thermal compound; check ventilation

Reset: Power cycle to reset protection circuits.

Service: Authorized Marantz service centers only.

Safety Precautions

This equipment contains hazardous voltages. Disconnect AC power before servicing. Use isolation transformer for live measurements. Discharge large capacitors before handling.

CAUTION! High voltages present. Qualified personnel only.

Service Notes

Marantz PM 11S2 uses surface mount technology requiring specialized equipment. HDAM modules are matched pairs - replace as sets. Thermal management critical for reliability. Document all adjustments made during service.