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Welcome to Ron’s tron tutorials and today
I am working on this old stereo amplifier. Some of you might still have a similar amplifier laying around in the attic still in use. This device is a Toshiba Stereo Receiver SA320L, which was manufactured in Japan. These andsimilar devices usually have a very high quality and this one is still in use. After about 35 years this unit still works almost flawlessly. Lately cracking noises were noticed when adjusting the volume. In addition you can see that some of the original backlights are defective. I will work on these issues today so that this 140 watts unit is all set to go back on duty. Before opening the device, it is
important to pull the plug. Then I remove these two Phillips screws on the side. Same thing on the other side. Before the housing can be removed there is one more screw on the back to be taken out. First I will takecare of the cracking and noise which disturbs the good sound quality of this device. If the device is dusty inside, it should first
of all be cleaned with compressed air. In this old device there is not much tiny electronic parts and plugs and connections are relatively large compared with newer models. This simplifies things because now it is important to find all connections and clean or treat with contact
spray. This helps to remove any corrosion or dirt, so that the current can flow freely
again. The same applies to the switches and potentiometers. These can get dusty and corrode
over time. Here again the contact spray can help. In order to reach the components it may be necessary to remove further parts ofthe housing like the bottom which is pretty easy usually as these devices are usually just screwed and not glued together. Now I have dusted off all contacts and potentiometer and treatedwith contact cleaner. Now I would like to renew the lights, as some are blown. On this model you
can take them out by twisting them. After that I just unplug the lamps. In this case they are 8 Volt T10 glass bulbs. I want to change them to LEDs. They can easily be ordered over the Internet. I’m putting the new LED into the socket and screw it back on I repeat this process for all lights. Most LEDs only work one way, so if it doesn’t light up just try it the other way. It is very important that you don’t put your hand into the device as long as the plug is still connected to the power line. Since the new LEDs are made for 12V systems they don’t shine as bright in this 8V sockets. But I don’t want it to shine very bright anyways so that’s good. The use of LEDs helps to run this amplifier more efficient from now on to save some power. The old bulbs also heated up the inside of the amplifier even more which now doesn’t happen anymore with the LEDs. After installingall lights I put the amplifier back together. I’m putting the case back on and all screws back in. And that’s it, the repair is already completed. In this case, the repair has broughtthe desired effect and the device can be used
without problems again. Thanks for joiningus and see you next time with
Ron’s Tron Tutorials.

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