Marantz 2215 Service Manual

The Marantz 2215 is a classic stereo receiver from the 1970s featuring 15 watts per channel RMS power output, high-quality phono preamp, tuner section with AM/FM reception, tone controls, headphone output, and traditional Marantz styling with blue dial lighting. Below are key sections for technical specifications, service procedures, alignment instructions, schematic diagrams, parts list, and troubleshooting.

1. Technical Specifications 2. Service Precautions 3. Disassembly Instructions 4. Circuit Description 5. Alignment Procedures 6. Schematic Diagrams 7. Parts List 8. Voltage Measurements 9. Troubleshooting Guide 10. Replacement Parts

Technical Specifications

Key electrical and performance characteristics of the Marantz 2215 receiver.

Parameter	Specification
Power Output	15 watts per channel RMS (8 ohms, 20Hz-20kHz)
Total Harmonic Distortion	0.3% at rated output
Frequency Response	10Hz-50kHz (+1, -3dB)
Input Sensitivity	Phono: 2.5mV; Aux: 150mV
Signal-to-Noise Ratio	Phono: 70dB; Aux: 85dB
Tuner Section	FM/AM with multiplex stereo
Tone Controls	Bass ±10dB at 50Hz; Treble ±10dB at 15kHz
Power Requirements	120V AC, 60Hz, 45 watts
Dimensions	16-1/2" W × 4-3/4" H × 13" D
Weight	18.5 lbs (8.4 kg)

Service Precautions

Important safety considerations before servicing the Marantz 2215.

Disconnect AC power before performing any internal service work.
Use isolation transformer when testing live circuits.
Observe proper grounding procedures to prevent electrostatic discharge.
Note that high voltages are present in power supply and output stages.
Allow sufficient cooling time after operation before handling internal components.

WARNING! Lethal voltages exist inside chassis. Only qualified technicians should perform service procedures.

Disassembly Instructions

Step-by-step procedure for accessing internal components.

Remove rear panel screws and carefully lift off rear cover.
Remove top cover by unscrewing four corner screws.
Detach front panel by removing screws along bottom edge.
For board access, remove additional mounting screws as needed.
Label all disconnected wires for proper reassembly.

CAUTION! Handle glass dial face and tuning mechanism with care to avoid damage.

Circuit Description

Overview of major circuit blocks and their functions.

Power Supply: Transformer-rectifier system providing ±24V DC and other voltages
Preamplifier: Phono and line-level amplification with tone controls
Power Amplifier: Complementary symmetry output stage with driver transistors
FM Tuner: RF amplifier, mixer, IF stages, and multiplex decoder
AM Tuner: RF and IF amplification with detector circuit
Protection Circuit: Speaker relay and overload protection

Alignment Procedures

Factory alignment instructions for tuner and amplifier sections.

FM IF Alignment: Adjust IF transformers for maximum output at 10.7MHz
FM Front End: Align RF and oscillator circuits for proper tracking
Stereo Decoder: Adjust separation and pilot cancellation
AM Alignment: Peak IF transformers and align oscillator tracking
Bias Adjustment: Set idle current for output transistors

Note: Use proper test equipment including signal generator, oscilloscope, and VTVM.

Schematic Diagrams

Complete circuit schematics included in manual.

Diagram	Description
Main Schematic	Complete receiver circuit diagram
Power Supply	Transformer, rectifiers, and regulators
Preamplifier	Phono and tone control circuits
Power Amplifier	Output stage and driver circuits
FM Tuner	RF, IF, and multiplex sections
AM Tuner	AM receiver circuitry
Control Section	Switches, pots, and input selection

Parts List

Complete component listing with manufacturer part numbers.

Transistors: 2SC458, 2SC945, 2SA495, 2SB507, 2SD313
Diodes: 1S1555, 1S2473, WZ-130, S-4S2
Integrated Circuits: HA-1156W (FM IF), TA-7130P (Phono)
Capacitors: Electrolytic, ceramic, and film types with values
Resistors: Carbon composition and metal film with tolerances
Transformers: Power, output, and IF transformers

Voltage Measurements

Reference voltage measurements at key test points.

Test Point	Voltage (DC)	Notes
Power Supply Output	+24V, -24V	Main rail voltages
Output Transistor Bases	±0.6V	Bias voltage
Phono Equalizer	+15V	Supply to preamp
FM IF IC (Pin 14)	+12V	HA-1156W supply
Protection Circuit	+24V	Relay driver supply

Troubleshooting Guide

Common problems and their solutions.

Symptom	Possible Cause	Corrective Action
No sound	Protection relay, power supply	Check relay operation; measure supply voltages
Distorted audio	Output transistors, bias	Test output devices; adjust bias current
No FM reception	FM tuner section, power	Check tuner board voltages; align front end
Hum in audio	Grounding, filter capacitors	Inspect ground connections; replace filter caps
Intermittent operation	Cold solder joints, switches	Resolder connections; clean controls and switches

Note: Always verify proper operation after repairs.

Replacement Parts

Recommended replacement components and equivalents.

Output Transistors: 2SD313/2SB507 or MJE15030/MJE15031 equivalents
Power Supply Diodes: 1N4004 or similar 1A rectifiers
Electrolytic Capacitors: Same values, higher voltage ratings acceptable
Lamps:8V, 300mA dial lights (replace in sets)

Fuse: 1.5A slow-blow (main power fuse)