hi-fi repair question

[thedoc46]

Hi,

is anyone in here qualified to repair electronics?

I have an old but perfect condition Yamaha RX-E100 amp for a component Yamaha midi-system.

Anyway, for whatever reason one speaker channel decides not to start at times... Sometimes you turn it off, turn it back on it comes back.. Or sometimes i just turn the vol up and down very quickly and normally within 10secs both channels come back on line...

I've checked all my connections, and it's not that, something definately wrong internally on the amp side...

So if anyone in here knows their stuff on electronics, what do you reckon it is? and where do you go to repair such things?

Problem is Yamaha does not sell anything small sized with plenty of aux inputs any more, and that's exactly what i need... So it would definitly be worth repairing...

 

[Torch [P4]]

dry or fractured solder joints causing intermitent connection? or signs of a component about to give up the ghost
check for leaking tantulum caps should be easy to spot and can usually tell by the smell they give off, also any burnt out resistors?

a safety note: beware of caps as they can store a LOT of energy so don't go touching them

 

[Sinopa]

My guess is the speaker protection relay.

Looking at the service manual I can see that the headphone out is taken just before the relay. If both channels on the headphones always work then I would say that proves the relay has dirty switch contacts.

Note. There is a switch on the headphone socket to detect that headphones are plugged in. This probably switches the relay off when headphones are in so plugging headphones in and out may cause the faulty speaker to come back on.

 

[thedoc46]

My guess is the speaker protection relay.

Looking at the service manual I can see that the headphone out is taken just before the relay. If both channels on the headphones always work then I would say that proves the relay has dirty switch contacts.

Note. There is a switch on the headphone socket to detect that headphones are plugged in. This probably switches the relay off when headphones are in so plugging headphones in and out may cause the faulty speaker to come back on.

Excellent and thanks... Just been trying this out and both speakers are working for the time being. So can't test that for sure.. But it does sound like you are on the right tracks.

Let me ask you, is something like that easy to fix for a electronics specialist? Will it need a special part from Yamaha? Reason i ask is because i'll need to get it fixed and would like to know roughly how much something like that type of repair would cost... Now the thing is, this unit is a UK model, i'm in the USA, running it off a power converter.. But looking around they did sell a RX-E100 receiver over here in the USA but it wasn't very popular. So getting the faulty part for it, may prove a task in itself. Unless they'd just use a generic part???? Sorry i have no idea which is why i'm asking you.

Thanks

 

[Sinopa]

Yes, it would be a simple repair. It is a fairly standard 24volt speaker relay (type DH24D2-OT/M2) not special to Yamaha. Should cost £10-£15 max for the part.

The Yamaha part number is VK438300 or VK438301. I beleive the substitution V6322600 will also work.

 

[thedoc46]

Yes, it would be a simple repair. It is a fairly standard 24volt speaker relay (type DH24D2-OT/M2) not special to Yamaha. Should cost £10-£15 max for the part.

The Yamaha part number is VK438300 or VK438301. I beleive the substitution V6322600 will also work.

TOP MAN !!!!!!!

 

[thedoc46]

Yes, it would be a simple repair. It is a fairly standard 24volt speaker relay (type DH24D2-OT/M2) not special to Yamaha. Should cost £10-£15 max for the part.

The Yamaha part number is VK438300 or VK438301. I beleive the substitution V6322600 will also work.

One last question. Looks like i can pick this part up myself for $10, so thanks for your help on all of this...

Do you think this is something a noob could change himself? I'm reasonable with things and not afraid to take something apart.. I use to solder mod-chips into the old PS1's as an example... But on the other hand i recently took apart a Dual Shock 3 controller and ended up having to sell it as parts on ebay, because for the life of me, i could not put it back to together.. A couple of springs shot off the analogue triggers and that was the end of it for me!

At the end of the day i guess i should wait to see what the part looks like and make a decision from there. But if it's just four solder joints i should be fine.. But it always pays to ask other peoples opinions ... Easy for a noob?

 

[Sinopa]

Very easy I'd say. Take cover off. 3 screws to remove fan. 2 screws on back panel. 2 or 3 screws for the main PCB. Slide amp unit to the rear then tilt upright. 6 solder joints on the relay.

Only if it turns out to be the relay or course!

 

[thedoc46]

Very easy I'd say. Take cover off. 3 screws to remove fan. 2 screws on back panel. 2 or 3 screws for the main PCB. Slide amp unit to the rear then tilt upright. 6 solder joints on the relay.

Only if it turns out to be the relay or course!

cool, for $10 i'll definiately give it a shot !

One other question that maybe you can answer seeing that you have the service manual... This unit is a UK model and therefore 240v, there is a US model designed to run on 110v... Can i convert this myself? For some of my other components, all i had to do was change an internal fuse for it to work.. Is such a change possible with this Yamana Piano Craft RX-E100 unit?

Once again thanks for all your help.

 

[Sinopa]

Your unit is not able to be converted. The US transformer part number is XW338A00 but I cannot advise you fit this yourself.

 

[thedoc46]

Your unit is not able to be converted. The US transformer part number is XW338A00 but I cannot advise you fit this yourself.

Thx, I'll just continue with my external power transformer in that case

I'm ordering the relay switch and will let you know how it goes..