Dear all,

I have this old radio clock by Sony from the early 80s, I guess. The clock display works, but is dim, the function board appears to be OK - but the radio unit shows no signs of life. It doesn't produce a single noise, crack or anything from either FM or AM band. It's like it doesn't even power up.
i opened the radio and it is full of some TRACON gray capacitors. They only have their negative strip printed, voltage and capacitace markings - no series, no temperature marking, nothing else.
My question is, do you know of this brand of capacitors and how bad are...

Hey everyone,

I'm currently working on a mid-70s Sharp Electronic Digital Clock Radio, Model FY-70CH. I found the service manual online, printed it out, and have been studying it for a while. My main reasons for tackling this are: (1) I want to learn electronics and figured I'd start with something I had on hand, and (2) I want to fix its issues. Right now, the radio sounds awful, has about 5V DC at the speaker terminals, and the alarm time setting doesn't work. But I'm not asking how to fix these problems.

Instead, here's what's been bugging me so far:
The schematic...

Hello I have a Emerson research clock radio model CKS3516C and the transformer went out on it ,the label on the clock radio says 120VAC 6 watt backup battery DC 3v CR2430. the numbers on the transformer ST3591C-13SEN which I can't find anywhere for it. Can anyone please tell me the AC output voltage. Thanks

I came across this sticker recently:



(It's from a 1980s GE clock radio - the model number is at the bottom left.)

I worked out the top pictogramme (indicating a 12/24 hour facility) and bottom pictogramme (120v or 220v mains power) fairly quickly. But the middle pictogramme...ah. That one left me baffled for a time.

(I won't say how long, exactly, because it would be too embarrassing.)

Eventually, it dawned upon me that this was a pictogramme to indicate a 9-volt battery backup facility.


My question is: has anyone...

Hello All,

I have an issue with my Majority PETERHOUSE GRADUATE Internet Radio, it keeps rebooting at the boot logo Welcome screen. I have an another forum active in other website but due to lack of response I am posting the same here. I am positing a link below that has pictures including all the troubleshooting I have tried, appreciate if someone can take a look and give me any suggestions.

https://www.hifivision.com/threads/m...-screen.98243/


Troubleshooting Summary: Majority Internet Radio - Flash Chip...