Marantz 2216B Service Manual

The Marantz 2216B is a classic stereo receiver featuring 16 watts per channel RMS, built-in AM/FM tuner, phono input for turntables, tape monitor circuits, loudness control, and tone controls. This service manual provides comprehensive technical information for service technicians, including schematics, alignment procedures, parts lists, and troubleshooting guides for the 2216B model. Below are key sections covering specifications, block diagrams, circuit descriptions, alignment procedures, and service adjustments.

1. Specifications 2. Block Diagram 3. Circuit Description 4. Alignment Procedures 5. Disassembly Instructions 6. Parts List 7. Schematic Diagrams 8. PCB Layouts 9. Service Adjustments 10. Troubleshooting Guide 11. Safety Precautions

Specifications

Technical specifications for the Marantz 2216B stereo receiver.

Parameter	Specification
Power Output	16 watts per channel RMS (8 ohms, 20Hz-20kHz)
Total Harmonic Distortion	0.3% at rated output
Frequency Response	20Hz - 20kHz (±1dB)
Input Sensitivity	Phono: 2.5mV; Aux: 150mV
Signal-to-Noise Ratio	Phono: 70dB; Aux: 80dB
Tuning Range	FM: 88-108MHz; AM: 530-1600kHz
Speaker Impedance	4-16 ohms
Power Requirements	120V AC, 60Hz, 45W
Dimensions	17-1/4" W × 4-3/4" H × 13" D
Weight	17.6 lbs (8 kg)

Block Diagram

System block diagram showing signal flow and major circuit sections.

Tuner Section: FM front end, IF stages, detector, and stereo decoder
Preamplifier: Phono equalization, tone controls, and input selection
Power Amplifier: Driver stages and complementary output transistors
Power Supply: Transformer, rectifiers, and regulation circuits
Protection Circuit: Speaker protection and thermal shutdown

NOTE: Refer to schematic diagrams for detailed circuit connections.

Circuit Description

Detailed description of major circuit sections and their operation.

FM Tuner: RF amplifier, mixer, local oscillator, and 10.7MHz IF stages
AM Tuner: Ferrite antenna, converter, and 455kHz IF amplifier
Phono Preamp: RIAA equalization with low-noise transistors
Tone Control: Bass and treble controls with center detents
Power Amplifier: Complementary symmetry output stage with 2SD288/2SB321 transistors
Power Supply: Full-wave rectification with capacitive filtering

CAUTION! High voltages present in power supply section.

Alignment Procedures

Step-by-step alignment procedures for tuner and amplifier sections.

FM IF Alignment: Adjust IF transformers for maximum output at 10.7MHz
FM Oscillator: Set tracking at 90MHz and 106MHz
AM Alignment: Adjust oscillator and antenna trimmers
Stereo Decoder: Adjust 19kHz and 38kHz adjustments for minimum distortion
DC Offset: Adjust bias for 0V DC at speaker terminals
Bias Current: Set idle current to 20mA per output pair

Disassembly Instructions

Proper disassembly sequence for service access.

Remove top cover: Four screws on rear panel
Remove bottom cover: Six screws on bottom
Remove front panel: Two screws on each side
Remove tuner assembly: Disconnect wiring harness and remove mounting screws
Remove main amplifier board: Desolder connections and remove mounting hardware

WARNING! Discharge power supply capacitors before working on circuits.

Parts List

Complete parts list with manufacturer part numbers.

Part Number	Description	Qty
2SD288	NPN Power Transistor	2
2SB321	PNP Power Transistor	2
HA1156W	IC FM IF/Detector/Stereo Decoder	1
P7001	Main Power Transformer	1
C701	6800μF 35V Electrolytic Capacitor	2
R801	0.33Ω 5W Fusible Resistor	2
F701	1.5A Fuse (AC Line)	1

Schematic Diagrams

Complete schematic diagrams for all circuit sections.

Main Amplifier Circuit: Power output stage and driver circuits
Tuner Section: FM/AM tuner and stereo decoder
Preamplifier: Phono and line-level input circuits
Power Supply: Transformer, rectification, and filtering
Control Circuits: Selector switches, tone controls, and protection

Tip: Use high-resolution prints for component identification.

PCB Layouts

Printed circuit board layouts and component placement guides.

Main Board: Component side and foil side diagrams with reference designators

Tuner Board: FM/AM tuner section component placement

Control Board: Selector switches and tone control circuits

NOTE: All measurements in millimeters; observe polarity for electrolytic capacitors.

Service Adjustments

Routine service adjustments and calibration procedures.

FM Alignment: Use FM generator at 98MHz for center tuning
AM Alignment: Set oscillator coil and antenna trimmer
Stereo Separation: Adjust for maximum separation (>35dB)
DC Balance: Adjust for 0V DC at output terminals
Bias Current: Set to 20mA using emitter resistor voltage drop
Meter Calibration: Adjust for accurate signal strength indication

WARNING! Use isolation transformer when servicing live circuits.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No power	Blown fuse, power switch	Check F701; test power switch; verify transformer output
No audio output	Protection circuit, output transistors	Check protection relay; test output transistors; verify bias
Distorted sound	Bias current, leaky capacitors	Adjust bias; replace coupling capacitors; check driver transistors
No FM reception	Tuner section, IF alignment	Check tuner power supply; realign IF stages; test HA1156W
Hum in audio	Ground loops, filter capacitors	Replace main filter capacitors; check ground connections

Service Note: Always check DC offset before connecting speakers.

Safety Precautions

Important safety information for service technicians.

FCC Part 15: Class B digital device; complies with interference limits. Always disconnect AC power before servicing. Use grounded tools and anti-static precautions. High voltages present in power supply - discharge capacitors before working. Replace fuses only with specified ratings. Copyright © 1977 Marantz; all rights reserved. For technical support, contact authorized Marantz service centers.