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Table of Contents
Table of Contents................................................................................................................ 2
Table of Figures .................................................................................................................. 2
Section 1: About This Manual ............................................................................................ 3
Other SCA-80 Upgrades................................................................................................. 3
Who Should Attempt these Projects? ............................................................................. 3
Tools You’ll Need........................................................................................................... 3
Project Overview ............................................................................................................ 4
About Components ......................................................................................................... 4
Recommended Solder ..................................................................................................... 4
Section 2: Building the Power Supply PC Board ............................................................... 5
First, Get A Soup Bowl! ............................................................................................. 5
Install the Resistors......................................................................................................... 5
Resistor Notes ............................................................................................................. 7
Install the Diode.............................................................................................................. 7
Install U2, the TO-92 Package 17.5 Volt Regulator....................................................... 7
Install the 24 Volt Regulator, TO-220 Package.............................................................. 8
Install the Capacitors....................................................................................................... 9
Solder GJ1 in Place..................................................................................................... 9
Remove the Old Power Supply................................................................................... 9
Install the New Power Supply........................................................................................... 10
Connect the New Power Supply ............................................................................... 12
Final Test and Assembly................................................................................................... 12
Schematic.......................................................................................................................... 14
Resistor Color Code...................................................................................................... 15
Table of Figures
Figure 1-A Soup Bowl Makes Assembly Easy................................................................... 5
Figure 2-Guide to component installation .......................................................................... 6
Figure 3-17.5 volt regulator comes in TO-92 package....................................................... 7
Figure 4-Front and Back views of Q6 mounted on heat sink ............................................. 8
Figure 5-Remove these wires from C11 ............................................................................. 9
Figure 6-Mounting the power supply to the SCA80......................................................... 10
Figure 7-Showing location of C11.................................................................................... 11
Figure 8-New Power Supply Installed in SCA80(Q) ....................................................... 13
Figure 9-Close up of Assembled Circuit Board................................................................ 13
Figure 10-Schematic of C11 Replacement Electronically Regulated Power Supply for
SCA-80 ............................................................................................................................. 14
Figure 11-demonstrating the resistor color code .............................................................. 15
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