Re: Roland AC Adapter 14,3V without load???
Posted on 2024-12-28, 20:02
I didn't see 7805 nowhere on Roland or on adapter?!? Shouldn't inside this adapter (or roland itself) be 7809, not 7805? It is a 9V adapter...
Re: Roland AC Adapter 14,3V without load???
Posted on 2024-12-28, 13:57
It is 11,25V when i check on the ac adapter jack inside Roland, when turned on?!? Is this ok or too high, or do i need to check after some chip, not on the adapter jack? Thanks
Re: Roland AC Adapter 14,3V without load???
Posted on 2024-12-28, 13:07
This is normal for unregulated transformer based power supplies. Usually the equipment from that era is able to deal with it. It never hurts to upgrade to a modern electronic power supply if you are worried, but ironically the transformers from yesteryear last decades without issues Hi, so it is ok …
Re: Roland AC Adapter 14,3V without load???
Posted on 2024-12-28, 13:07
It's a bit high, there's a voltage regulator inside these but it's usually a 7805. It requires, depending on the datasheet, 2 to 2.5 volts drop to properly regulate. And IIRC there is a diode as well to prevent reversed polarity. So to be on the safe side and account for possible grid dips the …
Roland AC Adapter 14,3V without load???
Posted on 2024-12-27, 15:45
Hi, i finally made my dream come true, and bought myself Roland MT-32 :) I didn't want to connect it yet, since his adapter (ACB-220) has 14,3V without load! Is this normal, 'cause all old adapters i have - gave me around 10-11V without load (like AC on Commodore 64, or DC on ZX Spectrum)? Thanks in …
Re: VLB s3 Card blinks often???
Posted on 2024-12-08, 15:46
blinks = screen loses sync. Normally I would blame the LCD screen first, but maaaaybe might also be caused by noisy power to the card. Since You are the second guy who pointed me to the LCD, i tried to connect it to my older LCD, and it works normally!!! Can't believe it didn't work on two LCDs, …
Re: VLB s3 Card blinks often???
Posted on 2024-12-08, 13:55
I took another 486 from my collection, and it was Cyrix DX40MHz, and the card works fantastic!!! without any issues??? So the problem could be in some frequencies on faster CPUs (VLB or ISA speeds)?
Re: VLB s3 Card blinks often???
Posted on 2024-12-08, 13:31
One thing i could do now is to reflow all the solder joints, maybe a little bit of hot air with flux on main memory chips.... But if someone has better idea, please help 😀
Re: VLB s3 Card blinks often???
Posted on 2024-12-08, 13:28
Your picture is blurry but the main S3 chip has 2 lines soldered together (could be that way from the factory), and also it looks like top right corner (second down) has a broken lead touching the one below it. I think those are ok, hope this picture is better? Those two connected are "factory …
Re: VLB s3 Card blinks often???
Posted on 2024-12-08, 11:25
Despite the fact than another card works fine on the monitor, have you tried a different monitor just to rule it out? Or are you somehow else confident that it's the card's problem? Yes, i tried on 2 computers (one 100MHz AMD 486, and this 120MHz), and few monitors. Any other card i connect on …
Re: VLB s3 Card blinks often???
Posted on 2024-12-08, 09:15
My guess: incompatible video ram is creating the issue. The main/soldered ram chips are TC514256AJ-70 standard DRAM but those ram upgrade chips AS4C256K16E0-50JC are EDO. Try this: remove the upgrade chips and see if you still have an issue. If you do still have the issue it is something else, use …
VLB s3 Card blinks often??? - Solved - LCD!!!!
Posted on 2024-12-07, 23:58
Hi, i need help from geniuses here!! I have one VLB card i bought few days ago that has some weird problem. Cards works ok until it starts to load DOS. Than the picture starts to blink (maybe every second or two). I tried to enter Prince of Persia, and i played game for almost 15 minutes, and it has …
Re: eMachines (FIC) AU31 Socket A (462) seem to be a CPU killer
Posted on 2024-11-29, 09:44
What most likely happened here: drawing.png Looking at Socket 370 and 462 datasheets they look pretty much identical. Socket step height is defined as 2.55mm. I was sure AMD cores were lower than Intel ones, but AMD lists Athlon height at 1.917mm REF and 1.777mm minimum, Pentium 3 1.787mm minimum …
Re: PHILIPS 9CM073/00B Power button replacement
Posted on 2024-11-26, 23:22
Does anyone have this monitor??? Nobody knows are the power switches same?
Re: eMachines (FIC) AU31 Socket A (462) seem to be a CPU killer
Posted on 2024-11-25, 12:02
[/quote] I so understand. There is a specific term/concept in psychology (that I can't remember). As long as it makes you feel good. [/quote] Next in line 😀 😀 😀
Re: eMachines (FIC) AU31 Socket A (462) seem to be a CPU killer
Posted on 2024-11-23, 09:10
Now i have to apologize to Momaka!!!! :) :) :) Sorry Momaka, if I could delete all my posts, i would do that, but it is too late :) Yeah , sorry Momaka ! :) Hehe, my bad. But still, i didn't know that there was some boards that didn't have this Abit "thing" :) I had only Abit 462 boards in early …
Re: eMachines (FIC) AU31 Socket A (462) seem to be a CPU killer
Posted on 2024-11-22, 10:55
I stopped toying with socket A as it is easy to make a fatal mistake. My experience with it is the following: - ALWAYS BE SURE THE HEATSINK IS FLUSH ON AND HAS PASTE - just using gravity to test is a very bad idea, it can overheat fast - always use paste, always, even for a short POST test: PASTE - …
Re: PHILIPS 9CM073/00B Power button replacement
Posted on 2024-11-22, 10:51
dominusprog wrote on 2024-11-22, 06:29: Use W40 contact cleaner and grease spray. https://www.wd40.com/products/contact-cleaner/ Yep, i tried with WD40 Contact cleaner, didn't sprayed with grease spray....
Re: PHILIPS 9CM073/00B Power button replacement
Posted on 2024-11-21, 19:21
Can you post a photo? Also check the voltage and current readings on the switch. I need to disassembly the monitor again to take pics :( Switch works, but i need to add toothpick :) on the upper side, to stuck the button on! I was hoping someone here has the same monitor, and had exact same problem …
EGA PHILIPS 9CM073/00B Power button replacement
Posted on 2024-11-21, 15:32
I finally had find EGA monitor for my collection!!! Monitor was in really bad shape, but worked (from auto service, garage). I cleaned it fully, and now looks awesome, but of course, the Power Button is at the end of his journey :) Does anybody knows, can I use power button from CM8833 or Commodore …
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