Re: Should I power this thing up?(I HAVE NO VARIAC)
do what do I do with all the diodes? and thermistors?
do what do I do with all the diodes? and thermistors?
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Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
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Re: Should I power this thing up?(I HAVE NO VARIAC)
Once again, you don't have thermistors in that power amp!
Just STV-3s, bias diodes, which will be fine if undisturbed. They're mounted to the heatsink.
If you're confused as to what they are, look at the schematic. The STV-3s have diode symbols, don't they? If you don't have the sch, I''ve attached it.
The only thermistors in this unit are the ones on the prot relay PCB, for temperature compensation, so the trip point is (mostly) the same over varying ambient temperatures."pokemon go... to hell!"
EOL it...
Originally posted by shango066Originally posted by smashstuff30guilty,guilty,guilty,guilty!
guilty of being cheap-made!
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Re: Should I power this thing up?(I HAVE NO VARIAC)
Got a list of caps to replace:
List of caps to replace
Now, is there anything else to replace? And have I gotten all of the caps to replace? I got the caps from the amp, the prot. board, and the tone board. Thank you.Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
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Re: Should I power this thing up?(I HAVE NO VARIAC)
my experience with old stuff,
check the power cable - is it still flexible & smooth - not stiff or cracked?
take all the fuses out (one at a time) - are all the clips still tight and springy?Comment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
power cable: yup.
fuses: most are soldered in, main fuse holder needs juuuuust a little work.
update: fixed main fuse holderDon't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
what to do now? is there anything else that needs replaced?Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
hello?Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
hello??????Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
does it work? if yes then just change the caps for now.
later you can check switchs & pots for crackle and any backlights in meters etc.Comment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
Volume is dirty and one of the switches is dirty. Going to clean it soon. Right now, the signal strength meter is frozen.Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: Should I power this thing up?(I HAVE NO VARIAC)
While I will say prices have gone INSANE with these, the particular unit you have seems to need a tuner alignment very badly. The tuners in these are quite sensitive if they're operating properly.
I'd also recap that voltage regulator board and adjust its output. The tuner won't work for crap if it's out of whack.Comment
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
Hi all,
I have an old Apple II monitor to restore and I do have a big variac. I've always wondered whether a variac is a good idea to power on equipment which has been unpowered for (likely) decades?
When it comes to analogue stuff, I suppose it's ok and I'm probably going to see the device slowly coming back to life with a lower voltage applied.
But I suppose this won't work for devices with digital components in it as they won't work unless the proper voltages are applied?
In case of an old monitor, it is safe/good for the monitor to...10-13-2023, 02:47 AM -
Hello everyone,
I was wondering if anyone in the forum can tell me how they use the variac transformer to check a switch mode power supply that they had just repaired.
I wanted to know how they adjust the votlage, do they start from zero and turn it up slowly or rather switch on that about 60V ac ( My country we use 220V ac) and hope for the best.
Also what sounds the PSU should make, what sounds wrong etc. Also if i have a scope what can i check for.
The reason why i am asking is i have a Sony LED TV PSU whose PFC circuit shorted out and upon closer inspection a... -
I have an old "Adjust-a-Volt" variac. Shortly after I bought it, it started smoking and now the windings look burned for about 2 inches around the left side. Is it possible to fix this or bypass the shorted windings? I'm not sure how to detect where the bad windings are, except by appearance. -
My Mom bought some cheap motion sensor lights on wish... then complains about about batteries and this thing chews though them, well it uses 4 AAA batteries and a pack of rechargeable ones is about 13 USD
well since it uses 4 AAA and rechargeable are 1.2v and non-recharge at 1.5 this thing must work with 4.8-6v, I'll shove a USB cable on it, infant i will use a broken phone charge cable... dam this thing uses 430 mA and they made it battery powered...
lets ignore the fact that i thought the board fit both ways... and the wire color is reversed going to the board...
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