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Author Topic: ATX Power Adapter Issue (3000T)  (Read 1600 times)

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Offline madgrizzleTopic starter

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ATX Power Adapter Issue (3000T)
« on: February 19, 2018, 08:33:16 PM »
I have one of Ian Stedman's ATX adapters that I'm trying to use with a 3000T.  Prior to connecting it to the motherboard, I want to triple check everything and make sure I'm getting the correct voltages at the plug going into the motherboard.  However, I can't seem to get the PSU to turn on.  I've installed a jumper on JP4 and set the switch to latch, but when I turn on the PSU via the switch on the mains, I get nothing (no voltage and no fans turning on).  I've emailed Ian but he hasn't responded (its only been a few hours).. Has anyone tried to use one of these before and know if you can use it without it plugged into the motherboard?

Edit: The first power supply outputs ~3V on pin 14 and the second output ~5V. When I jumper pin 14 to ground, both PSUs will power up.  I looked at the device in my microscope and it appears the lead to the jumper passes through an IC.  Github says this is a PIC microcontroller, so I suspect there is an an issue with it as it should operate from 2V to 5.5V (per a datasheet I found)
« Last Edit: February 19, 2018, 09:12:43 PM by madgrizzle »
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Offline madgrizzleTopic starter

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Re: ATX Power Adapter Issue (3000T)
« Reply #1 on: February 20, 2018, 12:20:57 PM »
Yes, I plugged in a scsi drive with no success.  If I jumper the pins on the atx PSU plug, they turn on.  I'm pretty sure there's an issue with the PIC at this point.  Just waiting for a response.  Thanks

Can you post a link to the adapter you are using?
« Last Edit: February 20, 2018, 12:24:14 PM by madgrizzle »
Only Amiga *woo-woo* Makes It Possible
Only Amiga   ... Makes.. It .. Happen!
Amiga 2000, 2MB Chip RAM, OS3.9, GVP Combo 030/22 13 MB, Supra 4MB
Amiga 3000, 16 MB RAM, OS3.9, A3640 v3.2 with 060 Processor, Picasso II, A2065, PCD-50B
Dead VA2000/CX :(