Marantz SM500DC - Introduction and System Overview; Introduction to the Service Manual; Printed Circuit Boards (P.W. Boards); Block Diagram

MODEL SM500 DC STEREO POWER AMPLIFIER
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1. ‘INTRODUCTION
This service manual was prepared for use by Authorized
Warranty Stations and contains service information for
the Marantz Model SM500DC Stereo Power Amplifier.
Servicing information and voltage data included in this
manual are intended for use by knowledgeable and ex-
perienced personnel only. All instructions should be
read carefully. No attempt should be made to proceed
without a good understanding of circuitry operation.
The parts list furnishes complete ordering information.
Most replacement parts should be ordered from the
Marantz Company. However, a simple description is
included for parts which can be obtained locally.
3. BLOCK DIAGRAM
FEEDBACK
NETWORK
POSITIVE
PREDRIVER DRIVER
BIAS
CIRCUIT
DIFFERENTIAL
INPUT
NEGATIVE
PREDRIVER DRIVER
DC SERVO
AMPLIFIER
PR AR REGIE
POSITIVE
LOAD LINE
LIMITING
PROTECTION
CIRCUIT
NEGATIVE
2. P.W. BOARDS
As can be seen from the circuit diagram, the chassis of
Model SM500DC consists of the following units. Each
unit mounted on a printed circuit board is described with-
in the square enclosed by a bold dotted line on the circuit
diagram.
1. Main Amp & Power Supply............-
mounted on P.W. Board P700
2. Speaker Switch. ... mounted on P.W. Board PSOO
3. Head Phone...... mounted on P.W. Board PWOO
4, Lamp.......... mounted on P.W. Board PZ00
POWER
METER
POSITIVE CIRCUIT
POWER
SPEAKER
PROTECTION
RELAY
HEAD
TO RCHO—— || PHONES
2
NEGATIVE
OWE, SPEAKERS
SYSTEM 1
TO
RCH
SPEAKER
SYSTEMS
SYSTEM 2
TO
RCH