Kyocera R-451 troubleshooting power

[chinombre]

Have a Kyocera R-451 receiver that has recently stopped powering on.

Both AC plugs in the back of the unit are still able to run power to plugged in devices, but the main power switch is not turning the unit on.

Novice here who's never had to troubleshoot or attempt a fix for something like this. Any suggestions for things I can try or check? Local vintage repair shop will not service it since it "relies on a number of proprietary parts".

 

[cademan]

Check for fuses either on the back panel or inside. Mind you that if you find a fuse that looks blackened, there is probably an internal short somewhere.

Since you say that you are a novice, I would just take it in and have a tech look at it.

 

[chinombre]

Thanks @cademan I got brave and cracked open the unit. I can see a few fuses and neither of them appear blackened. You reckon I could try to replace both fuses myself? I honestly think having a tech look at would probably cost more than the unit is worth.

 

[cademan]

Got any pics? One of those has to be the main power fuse but if you can't tell if they are bad by looking at them then you would need to take an ohm meter to them just to make sure as sometimes they break inside at the ends.

 

[swamppirate]

Those Kyocera units are well made and great sounding….well worth repairing.

 

[chinombre]

Got any pics? One of those has to be the main power fuse but if you can't tell if they are bad by looking at them then you would need to take an ohm meter to them just to make sure as sometimes they break inside at the ends.

@cademan I believe the fuse labeled 250V 4A is the one associated with the power switch. It's separate from the other two fuses and nearest to the switch.

20221014_163439

• chinombre
• Oct 14, 2022

Appears to be the fuse for the main power switch

20221014_163540

• chinombre
• Oct 14, 2022

fuse #2

20221014_163556

• chinombre
• Oct 14, 2022

fuse #3

 

[swamppirate]

Maybe its just me but the first one labeled 250V 4A looks suspect. Worth a go. Do you see any other caps that may have given up the ghost? And just for giggles, have you tried Deoxit on the power switch ?

 

[waggs098]

Check for fuses either on the back panel or inside. Mind you that if you find a fuse that looks blackened, there is probably an internal short somewhere.

Since you say that you are a novice, I would just take it in and have a tech look at it.

Someone has to learn somewhere. I would say if its very important to the op then maybe take it to a tech. If he wants to learn then go ahead and dive right in.

 

[petehall347]

don't waste new fuses they are sure to blow pretty quickly . and possibly make things worse . the short circuit needs finding and rectifying first .

 

[cademan]

First pic looks iffy to me also but the second pic really looks bad (too me anyway). Could be the light or the way the picture was taken but I would check both.

 

[Semanon]

Sometimes fuses simply fail, but most of the time they fail because they are doing their job of protecting stuff.

Someone has to learn somewhere. I would say if its very important to the op then maybe take it to a tech. If he wants to learn then go ahead and dive right in.

This is a decision point right now: find another tech (good advice anyway, cuz this guy sounds unhelpful), sell, donate, or trash it, or spend time and money to fix it yourself with an unknown outcome.

OP, if you go down the fix it road, you will need some tools. The most important one is a meter. Borrow one, or pick up a throw-away one for $15 online or at some place like HD or Harbor Freight. Without one, helping you effectively will be nearly impossible.

 

[cademan]

People here will be willing to help out no problem but your best bet would be to find a person on AudioKarma that might live close to you to give a visit and teach something as well.