Sansui 350A score - Lost all lighting as I was changing fuse-bulbs

[fcm44]

Hello group,

Yesterday I scored my first Sansui receiver ever for 20$. It is a Sansui 350A. It is in good condition, but it needed a few fuse-type bulbs to be replaced, some of the pots need a clean with deoxit and I'm trying to mend a switcher (stereo/mono switch) that's been broken. I am NO GOOD at electronics, but I usually can do this sot of stuff.

I had a few fuse-type bulbs home and wanted to change that first. So I plugged the receiver after changing a few of them. The new ones did light up, and some of the old ones too. But after 2 seconds, I lost ALL lights, including the bigger one and the "stereo" one that lights up when a radio station is in tune.

The receiver still works overall but there is no lighting at all.

Anyone knows what could've gone wrong in the process? Thank you.

 

[petehall347]

check the fuse .

 

[fcm44]

check the fuse .

The one in the back of the receiver? I thought since the rest of the receiver still works, the fuse was ok. I only lost lights.

 

[petehall347]

is there not a fuse for the lights ? it shows one on the schematic,

 

[fcm44]

I'm not gonna lie, I've opened the Schematic and the Manuals out of hifiengine ( here : https://www.hifiengine.com/manual_library/sansui/350a.shtml ) and it really is like Chinese to me. I don't know where the fuse lamps are in it.

 

[petehall347]

 

[petehall347]

if you cant see the fuse from above look underneath .

 

[spark1]

I think there is a wire-ended fuse in the lamp circuit, near the transformer (underneath).

 

[fcm44]

Is there a way to know what fuse I need to order to replace it ?

 

[spark1]

Shows as 3A in schematic. Or just look at it...amperage will be stamped on it at one end or the other. Go with same amperage and equal or higher voltage.

 

[fcm44]

I can't seem to find any fuse in this area. Also, there is no way to take off the front panel which would allow me to access the area way easier. Some receivers, you pop off the front panel and work from there.

 

[fcm44]

Could that little thing in the middle be a fuse ?

 

[petehall347]

follow the wires from the lights ..one of them goes to the fuse .

 

[spark1]

You have to remove the bottom panel. It is near the transformer.

 

[fcm44]

follow the wires from the lights ..one of them goes to the fuse .

If I follow the path of the white wire that starts at the bulbs, it brings me to that board. But I still get confused as to which of these components can be the fuse.

 

[petehall347]

look under the bottom panel

 

[spark1]

For the third time....remove the bottom panel. You will find an inline fuse, near the transformer (which is the big black square thing with a lot of different colored wires going in and out of it).

See second post in this thread:

https://audiokarma.org/forums/index.php?threads/sansui-350a-need-advice.864414/

 

[CT Jim]

I had a few fuse-type bulbs home
Considering how this thread has progressed who knows WHAT size fuse lamps were installed? Not knowing what a fuse is means you should not be playing around in there until someone helps you. Please be careful as you proceed. If you're not sure what a fuse is, how did you determine that you have fuse-bulbs, which look similar to a fuse?

Once the bottom cover is off, you will see the fuse, but I don't know if it's in a fuse holder, or wired in place?

 

[fcm44]

For the record, the bottom panel was always removed from the begining. I had to have it removed also to follow the wire's path to the circuit board.

Now, I see this fuse. It's hidden in some plastic wrap, I didn't know it was that far removed from either the bulbs or the circuit board.

So it's written TOYO 3A on it. It's got these wires on the ends of it.

I'm looking for this part over at Newark and Digikey but I can't find it. Can it be higher amp, like 5A let's say, or does it have to be 3A? Or would that fit ?

 

[fcm44]

I had a few fuse-type bulbs home
Considering how this thread has progressed who knows WHAT size fuse lamps were installed? Not knowing what a fuse is means you should not be playing around in there until someone helps you. Please be careful as you proceed. If you're not sure what a fuse is, how did you determine that you have fuse-bulbs, which look similar to a fuse?

Once the bottom cover is off, you will see the fuse, but I don't know if it's in a fuse holder, or wired in place?

Fuses come in all shapes and sizes, so do lamps. I couldn't just assume that THE ONE fuse I was looking for looked exactly like the LAMPS I had replaced. And just as I said, I re-lamped some of my other receivers with fuse-lamps and I still had 3-4 on hand. The fuse-lamps in the Sansui happened to be the same size as those in my Realistic and Sony that I had relamped in the past.