SMPS Gateway ADP-180AB Profile PSU Power Supply 12V 15A Delta

"Wild_Bill" schreef in bericht news:SqUwm.42376$ snipped-for-privacy@en-nntp-01.dc.easynews.com...

You can do some things before giving up:

- Check the power transistor(s). If they're gone, you may find the cause of it before replacing them and blow the new ones.

- Check the transformer for both opens and shorts. Shorts can be found by using a ringer.

- Check secondary rectifiers and caps. A short or even a bad one can explain your observations.

- Locate the main SMPS chip and look at its datasheet. You may find the outlines of the circuit. At last you can contact Delta. If they cannot help, don't want to help or become too expensive you can always trash the thing. Delta has a reputation in power supplies but I never need their services.

petrus bitbyter

Have you measured the resistance to ground for each of the output voltages?? You could discover why it is shutting down.

Thanks for the comments regarding various other checks.

After doing a quick check of the semis with the diode check of my BK Precision 388-HD, and not finding any suspicious readings, I put the PSU aside to do other stuff.

Today, with PR57 isolated supply, meter and 'scope (SC3100) arranged around the PSU, I turned it on for testing, knowing that voltage checks might not reveal much since the PSU is pulsing on-off.

Now the PSU is staying on with no load, or a low load of about 45W. Later, I'll flex the board a bit and then retry startup.

BTW, I just realized I had made test connections to a live circuit, and I'm still alive.. just not a lucky day for the alarmist types, I guess. Also, my fingers touched lead, but it's probably too painful to amputate them.

B+ 401VDC 0.647VAC 1.8Vp-p

--
WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html


"Wild_Bill"  wrote in message 
news:SqUwm.42376$5K7.381@en-nntp-01.dc1.easynews.com...
>I wasn\'t able to find any archived info regarding repair of this somewhat
> sophisticated, high current PSU. This is the 180W version of this ADP 
> series
> of SMPSs.
>

 --
> Cheers,
> WB
> .............
>

I ended up buying 2 replacement power supplies, since this situation is a FFAF favor for a friend, as a replacement would likely be the quickest solution for me (I'm slow). So I have a spare 12V 15A SMPS for other uses. I'm reluctant to disassemble the working replacement PSUs for more testing, since disassembly isn't as simple as opening the cases.

Luckily, both of the used replacement PSUs appear to work properly, and both have lower ripple on their outputs (which is possibly the fault with the original PSU).

After following up on the recommendations, and reviewing the SMPS section of the FAQ, and determining/witnessing that the original PSU will work intermittently, I thought I'd try my luck at getting replacements on eBay (2 units $25 each plus s/h).

The replacements have been tested with up to 8A load, so I'm somewhat confident that they will probably be reliable. I don't know how much current the Gateway Profile 5 all-in-one PC/laptop needs, only that 8A is about half of the rating of the ADP-180AB PSU.

I found that a salvaged power connector/terminal strip pin header from a 286 motherboard had pins of the correct size and spacing, so a 6-pin connector was fabricated to match the output connector of the ADP PSU.

BTW, ATX PSU power terminals aren't solid brass, the ones I examined are precision fabricated from sheetmetal (like Molex and others).

The load used is a halogen #9004 lo/hi dual beam headlamp (45W, 65W), mounted in a vented aluminum can, to reduce the annoying bright light source, and as a safety cage in the event that the pressurized lamp would burst. Note that the cage/can gets very hot, even though it's vented with numerous

1/4" holes drilled in it, so the can/lamp socket assembly needs to be supported in a way to prevent heat damage or ignition/fire of any nearby objects.

The smaller 3/16" (4.76 mm) push-on quick connect crimp terminals will fit the blade terminals in the headlamp connector socket, if closed slightly with pliers.

The #9004 headlamp provide loads of approximately 3.4A, 4.85A and 8A

Output checks:

11.93 - 12.01VDC, lower measurement with increased load

0.103 - 0.150 VAC ripple, lower meaurement with increased load

0.290 - 0.450 Vp-p ripple, lower measurement with increased load

The original, intermittent-starting PSU checks with just the low load (3.4A):

12.01VDC, 0.647 VAC, 1.8 Vp-p (incorrectly stated in previous post).

The AC measurements are taken with a Sencore SC3100 100MHz Auto Tracker, but ordinary DMM measurements would likely be inaccurate, due to the frequency of the ripple present on the DC voltage (approx 40kHz, I think). The use of a true-RMS DMM would likely result in more accurate AC measurements than those from a low-end DMM.