I had the radio on one of those big mobile wooden cabinets and it was playing music then I moved the cabinet slightly and since then it's stopped working. Any help on how to fix would be appreciated. I am a complete novice at electrical engineering. Thanks

 

I do have some suggestions, but will allow Audioguru to make them first.

 

Welcome to AAC!

The second thing that you will do is get the vacuum cleaner out and get all that dust out of there with the help of a soft paint brush.

The first thing that you will do before removing the dust is pretend that you are the first investigative agent arriving at a crime scene. You do not want to disturb anything without proper observation and recording any suspicious evidence pertaining to the crime.

That is, look for signs of stress, smoke, burnt or blown pieces, fragments, bulging capacitor tops, leaked residues, water or moister damage, mold, rust, loose or broken wiring, etc, etc. without touching anything.

Then go to step 2.

Step 3 - Take a good look at that fuse labeled T315mA. Do you see an intact wire inside the glass tube?

 

Let's start with the basics, does it power up, is there any sound, any radio?

 

it's stopped working

No lights, hiss or other signs of life?
Have you waggled the speaker connections at the back to see if there's an intermittent connection?

 

Move it back to the original position and maybe it works again; 40 years in the same place means sonething.

 

Hi guys, thanks for the helpful replies.

So the radio had been moved to my new house a few months ago and had been working fine. As I say I moved it about 5cm on its wheels whilst it was on and then silence.

Since then I get no hiss or feedback off any sort. It did used to make a sound when initially turned on even if not tuned but that is no longer the case.

The light on the tuner used to flicker on also at strong frequencies.

The sign on the back says danger high voltage. Does this only apply when plugged into mains?

 

The sign on the back says danger high voltage. Does this only apply when plugged into mains?

Capacitors inside the set may hold a dangerous charge even after mains has been disconnected, so wait several minutes after disconnecting power before exploring inside the set.

 

C614, C613 and maybe a few other have what look like electrolyte leak spots around them. I can't the the main filter caps but I suspect they are affected too. After 30+ years my prime suspects would be capacitor failures.

 

I think the hifi is old enough to be buried and replaced.
I had my first stereo receiver die at age 26 when its selector switch wore out and could not be replaced. The replacement stereo receiver died at age 28 when its FM stopped working and a few of its switches wore out.
Now music comes from the internet or from my cable TV provider so there are no switches, and I built my own amplifier.

 

I think the first thing is to not let Homer anywhere near it.

 

C614, C613 and maybe a few other have what look like electrolyte leak spots around them. I can't the the main filter caps but I suspect they are affected too. After 30+ years my prime suspects would be capacitor failures.

Thing is, it died immediately as I moved it. So surely something has become dislodged, the floor it was on is tiled so it may have been a sudden jerk as it rolled over the joint between tiles..

 

Thing is, it died immediately as I moved it. So surely something has become dislodged, the floor it was on is tiled so it may have been a sudden jerk as it rolled over the joint between tiles..

It might be but it's more likely the vibration from moving it caused internal component failure from brittle, thin and worn materials damaged from long years of use.
https://www.mouser.com/pdfdocs/ELNAReliabilityAlumElecCaps.pdf

Maybe it's time.

 

Don't believe the naysayers.
Never Say Die!

 

When I was a young engineer, a wise man said to me, that everything I was working on would be in the landfill before I knew it. I thought surely he must be mistaken, but I now see his words as prophetic.

 

Back up to the beginning. Did the power plug become dislodged? Is there power at the outlet?

 

Don't believe the naysayers.
Never Say Die!

View attachment 207449

My thoughts exactly. It took some major hits in my younger days, taking karate knocks, being carried up and downstairs etc, the little movement I did to it when it suddenly stopped working pales in comparison to what it has taken..

 

Back up to the beginning. Did the power plug become dislodged? Is there power at the outlet?

I'm a novice at EE, but not that bad, no and yes.

 

I would start with the obvious things such as power in, power cord, power switch, fuse.
Are there any signs of life such as panel lights on?
Do you have a test meter?

 

Hello,

The service manual seems to be available here:
https://www.hifiengine.com/manual_library/technics/sa-110.shtml
You will need to register to download the manaul.

bertus