Marantz ST400 - Introduction

MODEL ST400 AM/FM STEREOPHONIC TUNER
1. INTRODUCTION
This service manual was prepared for use by Authorized
Warranty Stations and contains service information for
Marantz Model ST400 AM/FM Stereophonic Tuner.
Servicing information and voltage data included in this
manual are intended for use by the knowledgeable and
experienced technician only. All instructions should be read
carefully. No attempt should be made to proceed without a
good understanding of the operations in the Tuner.
The parts list furnishes information by which replacement
parts may be ordered from the Marantz Company. A simple
description is included for parts which can usually be
obtained through local suppliers.
2. P.W. BOARDS
As can be seen from the circuit diagram, the chassis of
Model ST400 consists of the following units. Each unit
mounted on a printed circuit board is described within the
square enclosed by a bold dotted line on the circuit dia-
gram.
45 Tne eis Seas Salles « mounted on P.W. Board P100
2. Power Supply........ mounted on P.W. Board P800
3. FM/AM Buffer....... mounted on P.W. Board PCOO
4. DE-Emphasis........ mounted on P.W. Board PLOO
5. Frequency Counter .... mounted on P.W. Board PQ00
6. Switch & Meter. ...... mounted on P.W. Board PSO1
7. Stereo Survo Led...... mounted on P.W. Board PY00
8. Pointer Lamp........ mounted on P.W. Board PZ01
Figure 1. Dial Stringing