Search found 11 matches

by Ransom
Sun Mar 20, 2022 1:53 am
Forum: Introduce yourself!
Topic: Hello from Italy!
Replies: 21
Views: 1083

Re: Hello from Italy!

Writing emulators and FPGA cores?! Excellent, welcome.
by Ransom
Sun Feb 13, 2022 2:57 am
Forum: Hardware
Topic: Replacement rear panel for AV mod
Replies: 7
Views: 436

Re: Replacement rear panel for AV mod

Nice. yeah, I also want to do a composite mod at some point so might end up printing this, thanks.
by Ransom
Tue Jan 25, 2022 11:40 am
Forum: Hardware
Topic: I think my Japanese PSU is bad?
Replies: 20
Views: 1230

Re: I think my Japanese PSU is bad?

Ahhh, didn't know that. :o I'll try out the Traco then. 8-)
by Ransom
Tue Jan 25, 2022 4:44 am
Forum: Hardware
Topic: I think my Japanese PSU is bad?
Replies: 20
Views: 1230

Re: I think my Japanese PSU is bad?

Thanks, it works!!! For anyone interested, here are the steps and issues I went through: * Replaced the 7805 with a LM7805CV, the only kind I have on hand. Before installing I verified it output 5V with 9V in, in a test environment * For fun, tested the old 7805 that was pulled, sure enough, with 9V...
by Ransom
Mon Jan 24, 2022 2:41 pm
Forum: Hardware
Topic: I think my Japanese PSU is bad?
Replies: 20
Views: 1230

Re: I think my Japanese PSU is bad?

Thanks Tom. For the ground I mostly used the motherboard ground plane strip that the metal enclosure parts plug into, I tried to check my readings as suggested but I couldn't get the machine to get out of "black screen" and run correctly - but they did match as far as the "black screen" low voltage ...
by Ransom
Mon Jan 24, 2022 10:32 am
Forum: Hardware
Topic: I think my Japanese PSU is bad?
Replies: 20
Views: 1230

Re: I think my Japanese PSU is bad?

Thanks, very helpful. Ok, I took it out and to my surprise, it actually turned on - for around ten seconds. Then it shutoff, black screen. If I leave it on, it kind of toggles on/off at kind of random intervals around 5 to 30 seconds apart. I checked the three power pins on one of the 4116 and while...
by Ransom
Sun Jan 23, 2022 4:40 am
Forum: Hardware
Topic: I think my Japanese PSU is bad?
Replies: 20
Views: 1230

Re: I think my Japanese PSU is bad?

Oops, no I tested them wrong! I misunderstood the label. I had the negative lead on the N pin in the middle... I went and re-rested correctly...! The two pins on the left: 19V AC The two pins on the right: 11.7V DC So while the values are a little high, I guess under load they probably come down a b...
by Ransom
Sat Jan 22, 2022 10:05 am
Forum: Introduce yourself!
Topic: Hello from Japan
Replies: 6
Views: 439

Re: Hello from Japan

Thanks, I've posted the pic in a new thread in the hardware area.
by Ransom
Sat Jan 22, 2022 9:52 am
Forum: Hardware
Topic: I think my Japanese PSU is bad?
Replies: 20
Views: 1230

I think my Japanese PSU is bad?

Hey guys, So I was playing my Creativision one day around a year ago and it just died, video went blank. But when I toggled the power I did notice a flicker or light or something that made me think it was getting some. Anyway, I opened it up and was surprised to find 0 dc on everything, so it didn't...
by Ransom
Thu Jan 20, 2022 12:18 pm
Forum: Introduce yourself!
Topic: Hello from Japan
Replies: 6
Views: 439

Re: Hello from Japan

Yep, it's an NTSC Japanese model. The power supply says 100V, "Cherryko" branded, hmm. Will take a close look and open a thread with pics if it isn't an obvious problem. Thanks for the replies and info!