CAE Dynaco ST-70 Restoration Module Assembly, Installation And Adjustment Manual

Driver restoration pc board

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Page 1

I. Introduction

Thanks for your purchase of our ST-70 Driver Restoration PC Board. It has been

designed to provide an exact replacement for the original Dynaco input driver card (Dyna

PC-3) using dramatically improved construction materials (Mil Spec FR-4 fiberglass). It

has been designed to drop into the original PC-3 position without any electrical or

mechanical changes to your ST-70. Once installed, the reliability of your ST-70 will be

greatly improved and its stability significantly enhanced.

This document describes the specific instructions and steps associated with our Dynaco

Upgrade board (PC-3R). Additional documents referenced (and available from our web

page) are:

General Overview Assembly Notes (CAE Tech Note # 1)

Soldering Tutorial (CAE Tech Note # 2)

Recommended Tools & Test Instruments (CAE Tech Note # 3)

Please take the time to familiarize yourself with all of these documents in particular Tech

Note # 1.

II. General Overview

Take time to review all of the documentation provided including the aforementioned tech

notes related to soldering technique and proper tools and test equipment. In the following

sections we will guide you through several project phases. Each section has been

carefully prepared with our own notes and comments from our customers to be sure that

any anticipated question has been considered. The sequence is identical to that which we

follow when we complete the fabrication for our customers. Please follow the same

sequence to maximize efficiency and eliminate errors. It is also very helpful to read each

section before beginning to gain a visual idea of the construction.

Your project will be built in stages. If you have purchased the PC Board in its

unassembled form (PWB-PC3U) you will first assemble the components onto that board.

Next, you will remove the original Dynaco PC-3 board and carefully label each of the

associated wires. You will then install the CAE replacement upgrade PC Board and

reconnect the original wires to their corresponding terminals followed by a few electrical

tests and power up sequence.

Finally you will check and set the bias of the output stage.

Dynaco ST-70 Restoration Module

Assembly, Installation, and Adjustment Manual

CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02

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Summary of Contents for CAE Dynaco ST-70 Restoration Module

Page 1 Next, you will remove the original Dynaco PC-3 board and carefully label each of the associated wires. You will then install the CAE replacement upgrade PC Board and reconnect the original wires to their corresponding terminals followed by a few electrical tests and power up sequence.
Page 2 Assembly, Installation, and Adjustment Manual Page 2 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02 Please note that this module houses components having lethal voltages present on their leads and cases. Please take the appropriate care in both installing and operating this module.
Page 3 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 3 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02 III. Assembly A. Building the PC Board (PC-3R) Components are to be inserted on the non foil side and soldered on the foil side. The sequence of assembly has been chosen so that the components with the lowest profile (such as jumpers, low power resistors, IC’s etc.) are installed first with higher profile...
Page 4 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 4 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02 6. Visually inspect all of your solder connections. Refer to the adjacent diagram. Quality solder connections should be smooth and shiny. Dull surface or large blobs on the PC board should be cleaned and resoldered.
Page 5 C . Installation of the New CAE Stereo 70 Driver Board (CAE-PC-3R) 1. Locate the CAE replacement Driver board (PC-3R) and orient it so that the TWO 330K ohm 3 Watt resistors are near the rear of the amplifier (nearest the amp center).
Page 6 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 6 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02 D . Final Checkout & Initial Power Application 1. Replace the power fuse (3A Slo-Blo) with a 1A AGC (quick trip).
Page 7 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 7 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02 Figure 1...
Page 8 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 8 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02 CAE Stereo 70 Restoration Module 7-02 Stereo 70 Restoration Module, CAE# ASM-3R PAGE 1 of 1 DESIG DESCRIPTION QNTY PART NUMBER VAL / VOLT C1 &...
Page 9 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 9 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02...
Page 10 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 10 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02...
Page 11 Dynaco ST-70 Restoration Module Assembly, Installation, and Adjustment Manual Page 11 CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02...