Sansui 6060 fuse advice needed

[bankara]

Greetings, I just got back from travelling in South America for a year and went to fire up my Sansui 6060 and kick back with the fine quality audio fix that I have been missing so much only to discover that my fuses died while I was away.
3 fuses are in there, two 125V 5A fuses and one 250V 2A. It appears that only 250 2A is dead but as long as I am in there I may as well replace the others. I just wanted to check with the fine geniuses here before ordering a new set of fuses to see if there are any specific fuses I need to use. When I put new fuses into my old Sansui 771 they had to be quick acting fuses and I had to order them from a member of the forums.
So anyway, any advice that would get me back upand running would be greatly appreciated. Thanks!
Bankara

[KingBubba]

You can use 250 volt fuses for all, but do not exceed the amperage rating of the fuses.

[LBPete]

Bankara, welcome to AudioKarma. You join a long list of members who start here with a "fix my gear" post.

As far as the fuses, you can use ordinary fast acting fuses, not "slo blow." Radio shack has them.

The bigger question is why did it fail? Fuses generally don't "expire" for no reason if they are the correct rating for the application.

- Pete

[EchoWars]

RatShack fuses are expensive low quality crap. Check a local Lowe's or the neighborhood Ma 'n Pa hardware store.

[Hyperion]

The bigger question is why did it fail? Fuses generally don't "expire" for no reason if they are the correct rating for the application.

- Pete

Fuses do 'fatigue' over time - sometimes depending on the running current versus the fuse rating (indicating a possibly underrated fuse) - thus they can blow for apparently no reason - but it is fairly rare.

Just my 3 ha'pence worth.

John

[bankara]

thanks for your advice guys, I will grab a new set of fuses and let you know what happens. The stereo had been travelled across the country on very poor suspension twice in a year so that may have contributed to a weakened physical state of the fuse. It doesnt even look burned, just snapped.
Thanks again
Banks

[bankara]

OK, replacd the burnt out 250V 2A fus and now the 6060 lights up again BUT I cannot get sound to come out. I dont hear the distinctive *CLICK* that used to happen when the unit un-damped the speakers. Now I am truly at a loss here, I don't know what is wrong with this thing. Any suggestions for where to start looking? I just got back from and expedition to Amoeba records in San Francisco and I was really hoping to have a listen when I got home.
Thanks again
-Bankara

[terra1]

Did you replace all the fuses or just the burnt one? Your last post just mentions the burnt one.

If you didn't, do so to eliminate that possibility. Fuses can look good but may still be bad.

Do all the lights work including meter, dial lights, and source indicator lights?

If you did replace all fuses then maybe look inside for anything that looks burnt or loose, or for cracked solder joints etc, etc.

[bankara]

I saw no signs of fatigue on any other parts, I am working on finding some replacement fuses. I would obviously prefer to use the same rated fuses that were originally in there but it is proving exceedingliy difficult to locate the 125volt 5amp fuses in 1 1/4 x 1/4 size. I cannot find a vendor online for this type. The only ones that come with this rating in this size are 5x20mm, which is too small for this application.
Anyone know where I an get a line on these fuses?

[terra1]

I saw no signs of fatigue on any other parts, I am working on finding some replacement fuses. I would obviously prefer to use the same rated fuses that were originally in there but it is proving exceedingliy difficult to locate the 125volt 5amp fuses in 1 1/4 x 1/4 size. I cannot find a vendor online for this type. The only ones that come with this rating in this size are 5x20mm, which is too small for this application.
Anyone know where I an get a line on these fuses?

They don't have to be 125V. It's the amperage 5A or 2A that's critical. If you look at a package by Bussman they will say UP TO 250V. I had the same problem finding 125V until I noticed that note. Just as King Bubba says above, they should work. 1 1/4 x 1/4 will commonly be the AGC types.

You can get cheaper fuses at Home Depot or local hardware. Our local Lowes used to have them but for some reason I couldn't find their fuse display the last time. Radio Shack has them but are more expensive (they have separate fast and slow-blow drawers). Fry's is pretty expensive too.

[klondike]

OK, replacd the burnt out 250V 2A fus and now the 6060 lights up again BUT I cannot get sound to come out. I dont hear the distinctive *CLICK* that used to happen when the unit un-damped the speakers. Now I am truly at a loss here, I don't know what is wrong with this thing. Any suggestions for where to start looking? I just got back from and expedition to Amoeba records in San Francisco and I was really hoping to have a listen when I got home.
Thanks again
-Bankara

I'm not familiar with 6060. But it sounds like the speaker relay is not being driven. It could be the fault of the relay or the driving transistor, or even worst, the protection mechanism has detected some fatal error and shut off the relay. If you have the schematic, I can tell you what to look in detail.

Good luck!

[bankara]

I saw no signs of fatigue on any other parts, I am working on finding some replacement fuses. I would obviously prefer to use the same rated fuses that were originally in there but it is proving exceedingliy difficult to locate the 125volt 5amp fuses in 1 1/4 x 1/4 size. I cannot find a vendor online for this type. The only ones that come with this rating in this size are 5x20mm, which is too small for this application.
Anyone know where I an get a line on these fuses?

[bankara]

oops, posted that one twice
I will grab some 250v 5A fuses at rat shack or hell depot and see what happens. Sadly I have no schematic for the 6060. If the fuses do not work then I shall have to buy the schematics from one of the numerous vendors of manuals and schematics that exist online.
The unit is otherwise functioning though, all of the lights come on and the tuner is obviously receiving a signal because the signal and tune needles are moving when I sweep the dial.
Thanks again for all your sage advice guys!
-Banks

[kcollins4]

I'll second the availability of fuses for our gear at Lowes. Don't know if they are around your location, but they will be on the end of one of the electrical aisles, usually in a yellow display cabinet, with pull out drawers for many sizes and styles.

[terra1]

oops, posted that one twice
I will grab some 250v 5A fuses at rat shack or hell depot and see what happens. Sadly I have no schematic for the 6060. If the fuses do not work then I shall have to buy the schematics from one of the numerous vendors of manuals and schematics that exist online.
The unit is otherwise functioning though, all of the lights come on and the tuner is obviously receiving a signal because the signal and tune needles are moving when I sweep the dial.
Thanks again for all your sage advice guys!
-Banks

Replacing the fuses is just trying to eliminate the simple stuff first that you can easily do.

As klondike says, it could still be the relay or worse. Unfortunately, I don't think the needle movement and lights eliminate that possibility.

[Stene]

Sadly I have no schematic for the 6060. If the fuses do not work then I shall have to buy the schematics from one of the numerous vendors of manuals and schematics that exist online.

-BanksBe sure to get the correct one. 6060 is using two different Power Supply boards, F-2701 or F-2648

[bankara]

Well, replacing the fuses has proved correct the theory that something else is the source of my problems. Still no luck in resuscitating the sound producing aspect of the unit. I have a 2648 power supply board in there, anyone got a schematic or a suggestion for what to do next? I love my 6060 and would like to see it back in working order but my chops at solid state repair don't extend much beyond fuse replacement. I would like to learn but it really depends on how complicated this operation is going to be.
thanks again guys!
-Eddie

[LBPete]

The two amp fuse, F601, is in the lighting circuit. When it blows, the lights go out but everything else should work. Check the lighting circuit for shorts.

- Pete

[bankara]

Lights are working on this unit after I replaced the one obviously blown fuse (250V 2A) on the power board. Everything appears to work but it still does not drive the speakers. Since the lights are back up that would seem to remove the possibility of the F601 being the cause, right?

[bankara]

ok, so the F601 Fuse is on the F-2647 lighting Board? Because, if it is then I don't see it.

[Stene]

ok, so the F601 Fuse is on the F-2647 lighting Board? Because, if it is then I don't see it.F601 more likely on F-2648 Power Supply Board

[bankara]

ok, my mistake F601 is the fuse I already replaced. That one did restore functionality to the lights but it has not restored the unit to fully operating. So where do I go from here? I am not sure what to check next, nothing else appears to be damaged but the unit is not undamping the speakers.

[LBPete]

In re-reading the earlier description, it sounds like it is in protection mode. You need to check the dc offset at a point before the protection relay. I'm not familiar enough with this model to give you an exact test point. A schematic would be a big help.

- Pete