idflyfish

Hi Lee, I just received my copy of the fbForth 2.0 Manual and thumbed through it. Fantastic job sir!

I don't blame him.

I decided to pull my TI out of the closet and get caught up on the going's on. Imagine my surprise to see this thread! This is unbelievable!

I received my new power supply and tested it. I was able to get 5.21v DC on pins 1 and 4 but got 2.6v AC on pins 3 and 5. This totally puzzled me until I removed the 1.6a fuse and found that it was blown. I guess I expected a blown fuse to not show any reading because that was what I experienced when the 4a fuse was blown. Anyway, I replaced this fuse and now everything works. Thanks to everyone for their help. I'm going to continue learning about the innards of the C 128.

Yes. I notice mine is very different from any images of 128 PSUs I have seen on the internet. I have ordered a new one which I will promptly inspect before plugging it in.

I replaced the fuse again. I am going to leave the PSU plugged in for a while to see what happens. This is because the last time I replaced the fuse I did plug it into the C128 which caused a load hum through the monitor speakers. However, the fuse blew after I had unplugged it from the C128 and while I was testing it with my MM. Anyway, I get 5.21v DC when testing pins 1 and 4. However, I only get 2.54v AC when testing pins 3 and 5. The troubleshooting continues.

Roger that. It would be helpful if I had a known good PSU. I'll keep working at it.

What about the goop in the top image. Is that normal?

Here are some images of what looks like a problem.

it works now

Looks like your link didn't work.

I am in North America. I have virtually no experience with electronics but I do have a digital multimeter and I am more than willing to learn, though it might take me a while.

It blew while not plugged into the 128. Couldn't that be attributed to using a 2a 250v fuse instead of the proper 4a 125v fuse?

It lasted for about 10 minutes and then blew

I went down to a electronics store and the owner told me that a 2a 250v fuse is a suitable replacement for a 4a 125v fuse. I really don't know much about electronics but this didn't sound right so I questioned it. I was then told by the owner that he had "gone to college for this" and that it would be fine. A quick google search proved this is horse crap. Anyway, I ordered a 5 pack of 4a 125v fuses from ebay. I will let everyone know how it goes.

F3 fuse is blown. Getting one on order.

thanks 7800

My C 128 PSU seems to be dead. I got 0 on my multimeter when I checked for 5 VDC. According to what I have read I should check to see if a fuse inside of the power supply is blown. Is it safe to pull apart the PSU while it isn't plugged in? Is there anything I need to be aware of before I do this?

LOL fine.. I'll play along.

Further evidence that this is the best 8-bit (16-bit kinda sorta) community in the world.

I believe that is when my Dad got my brother and I one. Unfortunately we didn't really understand what we had and really only used it to play Demon Attack and TI Invaders.