Question about Umax Astra 3400 Flatbed Scanner

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Is there a replacement 12 VDC power supply w/cord available for the 3450 scanner?

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I simply googled "Umax Astra 3400 12 v dc power cord" and found this . . . http://www.amazon.com/power-adapter-Umax-astra-Scanner/dp/B0028T3Z3A

Posted on Dec 28, 2010

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How do i turn on a compaq ps-7231 power supply?


Pin Name Color
Description 1 3.3V Orange +3.3 VDC 2 3.3V Orange +3.3 VDC 3 COM Black Ground 4 5V Red +5 VDC 5 COM Black Ground 6 5V Red +5 VDC 7 COM Black Ground 8 PWR_OK Gray Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok) 9 5VSB Purple +5 VDC Standby Voltage (max 10mA, max 2A in ATX 2.2 spec) 10 12V Yellow +12 VDC 11 12V Yellow +12 VDC 12 3.3V Orange +3.3 VDC 13 3.3V Orange +3.3 VDC. ATX V2.3 / EPS12V V2.92 both define that the PSU has to use remote sensing to compensate cable drops on the 3.3V line. Because of this there is an additional brown cable crimped together with the orange cable either to pin 13 (ATX) or pin 1 (EPS12V). 14 -12V Blue -12 VDC 15 COM Black Ground 16 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF. 17 COM Black Ground 18 COM Black Ground 19 COM Black Ground 20 -5V White -5 VDC (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units) 21 +5V Red +5 VDC 22 +5V Red +5 VDC 23 +5V Red +5 VDC 24 COM Black Ground /PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.

Feb 26, 2015 | Compaq Computers & Internet

1 Answer

I want to convert this power supply for use with a battery charger for model aircraft. I need to know the color codes for the wires and also the pinout and which wire is the power on.


Pin Name Color Description
1 3.3V Orange +3.3 VDC
2 3.3V Orange +3.3 VDC
3 COM Black Ground
4 5V Red +5 VDC
5 COM Black Ground
6 5V Red +5 VDC
7 COM Black Ground
8 PWR_OK Gray Power Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
10 12V Yellow +12 VDC
11 3.3V Orange +3.3 VDC
12 -12V Blue -12 VDC
13 COM Black Ground
14 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15 COM Black Ground
16 COM Black Ground
17 COM Black Ground
18 -5V White -5 VDC
19 5V Red +5 VDC
20 5V Red +5 VDC

/PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.
18 AWG is recommended for all wires except pin 11, which should be 22 AWG. For 300W configurations 16 AWG is recommended.
There are several ATX variants.
Hope this helps.
If this helps you resolve your problem, please
consider giving me a rating of 4.It will help me as well. Thank you.

Nov 26, 2010 | Compaq (243890-001) 250-Watt Power Supply

2 Answers

MY Lexmark 3450 all in one show cover open but it


Nothing much can be done, you can try to unplug and replug the power supply after 30 secs if still doesnt work then its a hardware failure, kindly replace the product with the manufacturer.

Sep 14, 2009 | Umax Astra 3450 Flatbed Scanner

1 Answer

Pin Name Color Description


Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

Apr 01, 2009 | HP Compaq dc7100 PC Desktop

3 Answers

HP 4070 Doesn't Power Up


Power requirement per HP specs is 12VDC @ 575mA 6.9w. My scanner and power supply shows 12 VDC @ 1250ma.Over double the power going in that required. No wonder the fuse blows and you have to buy a new scanner because you can't identify or get a replacement fuse. I would suggest you confront HP and have them supply you with a new scanner.

Aug 07, 2008 | HP Scanjet 4070 Flatbed Scanner

1 Answer

Visioneer 8920


I have had this very problem with 2 of these scanners (8920) and finally figured out what happens is that the cheap chinese power supply loses power over time and then finally gives out. Before it fully gives out it doesn't have enough power to scan properly but will still turn the scanner on. Symptoms range from terrible scans with noise to the dreaded "scanner is locked" error. I got a new power supply from radioshack - 12 VDC at 1.5A (1500 MA) and it works like brand new! Make sure the power supply can deliver the full 1.5 A of the original! This is very important.

Jan 22, 2008 | Visioneer OneTouch 8920 Flatbed Scanner

1 Answer

Power on problem.


What do you mean the power supply has been repaired and outputs 24 vdc and 12 vdc?

Jan 14, 2008 | Protron PLTV-32 Television

1 Answer

Visioneer scanner 9220


If there isn't any light..........it means that the power adapter has bit the dust or the lite has burned out. Does the scanner light come on? There is probably a second hand shop somewhere around that has a used replacement real cheap.... 12 volt DC, 1.25 amp w/ the center being +. Or you can take it to a shop and have them check it out to see if it is putting out voltage... it will read 50% more than 12 vdc if it is still good.

Mar 30, 2007 | Visioneer OneTouch 9220 Flatbed Scanner

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