Marantz PM-94 Service Manual

Marantz PM-94 Specifications

General

Input Sensitivity	0.2 mV (MC), 2.5 mV (MM), 150 mV (line)
Type	Integrated Amplifier
Frequency Response	5 Hz - 100 kHz
Damping Factor	100
Signal to Noise Ratio	110dB (line input)
Output	Speakers A, B

Summary

Ordering Parts

Technical Assistance

Introduction to Marantz PM-94

Printed Circuit Board Layout

Tone (L) and Tone (R) Boards

Details the P.W. boards for the Tone (L) and Tone (R) assemblies.

Flat Amp/Supply and CD Direct Boards

Covers P.W. boards for Flat Amp/Supply and CD Direct/Balance circuitry.

Power Transistor and Protection Boards

Details P.W. boards for Power Transistor, Comparator, Protect, and Supply functions.

Volume, Selector, and Muting Boards

Covers P.W. boards for Main Volume, Speaker Muting, Phono/Speaker Selector, and Muting circuits.

Test Equipment for Servicing

Voltage Conversion

Adjustment Procedures

Output Offset Voltage Adjustment

Procedure to adjust output offset voltage for L and R channels to ±10 mV.

Idling Adjustment

Steps to set idling voltage between J607 and J707 to 36 mV and 180 mV.

Quarter 'A' Adjustment

Adjusts amplifier bias and waveforms for optimal performance by setting pulse width and emitter voltage.