DYNACO Stereo 120 Updating Instructions

Name: DYNACO Stereo 120
Brand: DYNACO
Rating: 5 (1 reviews)

32 pages

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UPDATING THE

DYNACO STEREO 120

SOLID STATE

POWER AMPLIFIER:

SUPER HEATSINK

VERSION

Revision 1.12: October 20, 2011

Table of Contents2
Table of Figures3
Section 1: about this Manual4
Who Should Attempt this Project4
Tools You'll Need4
Project Overview5
Important Safety Notes5
Section 2: Checking the Stereo 120 Power Supply6
Opening the Amplifier6
Check the Power Supply Voltages6
Figure 1-Location of the Four Screws that Hold the Cover to the Base6
Section 3: Saving the Stuff that Should be Saved7
Cutting the Wires on the Old Amplifier Modules7
Removing the LEFT Channel Module7
Removing the RIGHT Channel Module8
Figure 2-Location Diagram for Cutting Wires9
Figure 3-After the Amplifier Modules Have Been Removed10
Removing C7 RIGHT11
Removing C7 LEFT11
Removing the Output Zobel Networks11
Figure 4- Removal of Components Is Completed12
Section 4: Troubleshooting the Stereo 120 Power Supply13
Prepare and Connect the Test Load13
Test the Power Supply13
Figure 5-Connecting a Test Load to the Power Supply13
Just in Case - Trouble Shooting14
The Voltage Is Much more than 78 Volts14
The Voltage Is Much Less than 66 Volts14
There's no Voltage at All14
Section 5: Building the Updated Circuit Boards15
Install the Resistors15
Figure 6-The First Four Resistors Are Installed with Leads Bent on the Back Side, but Not yet15
Figure 7-Leads Soldered and Clipped16
Install the Small Capacitors and the Diodes17
Figure 8-Showing LED Cathode Orientation17
Last Capacitors and the Transistors18
Winding the Output Inductor18
Solder the LM3886 into the Board19
Figure 9-Starting to Wind the Output Inductor19
Figure 10-Finishing Step for the Output Inductor19
Figure 11-Showing Method of Attaching Brackets to the PCB20
Figure 12-Template for Checking Mounting Height of LM388621
Figure 13-LM3886 Installation Step Three, Just the Corner Pins Are Soldered21
Final Inspection of the Circuit Board22
Figure 14-The LM3886 Sits up off the Board to Avoid Shorts between the Front and Back22
Mounting the Updated Amplifier Board to the Super Heat Sink23
Figure 15-Mounting Assembled PCB to Super Heat Sink23
Figure 16-A Completed Amplifier Module24
Figure 17-Showing Detail of Attaching Power Wiring Harness to C1224
Figure 18-Showing the Final Wiring (Shown with Original, Rather than Super Heatsinks)24
Section 6: Wiring in the Updated Amplifier Modules25
Building and Installing the Power Wiring Harness25
Figure 19-Final Wiring Viewed from the Other Side of the Amplifier (Shown with Original, Rather than Super Heat Sinks)25
Building and Installing the Ground Wiring Harness26
Figure 20-Wiring Harness26
Wiring the Inputs27
Wiring the Outputs27
Connecting the Left Channel Amplifier Module27
Figure 21-Ground Wiring Harness27
Connecting the Right Channel Amplifier Module28
Making the Speaker Binding Posts User Friendly29
Section 7: Testing the Completed Amplifier29
Test #129
Test #230
Test #330
Test #430
Figure 22-Schematic of Amplifer Module31
Resistor Color Code32
Figure 23-Demonstrating the Resistor Color Code32

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DYNACO Stereo 120 Specifications

General

Brand	DYNACO
Model	Stereo 120
Category	Amplifier
Language	English

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