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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.
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.
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.
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.
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.
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.
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