Question about HP Scanjet 5470c Flatbed Scanner
I have a HP 5470c scanner with no power. Is there a possible common solution that can resolve the issue. All the basic have been looked at. Or is just time for a new scanner?
I've done it, using an adjustable power supply all i needed was 12VDC -
2Amp, the power connector going to the scanner is a 4 pin mini-DIN
male, so i've ripped of the cable from the original bad power module,
cable has inside 2 wires one black one white and a shielding. Black and
schielding are connected together and are going to the minus, the white
one is going to +12V
guess what? .... my scanner is working again
Posted on Dec 27, 2007
After reading guest (solution no 2) i used an old 12v psu (goodmans car dvd), it worked fine just a few points,
i think he got his last wiring wrong
top left +12
bottom left 12v ground
top right +24v
bottom right 24v ground
the scanner only psu is 12v 1250ma, i disconnected my adf and am just happy to get scanner going again , might pick up a 24v psu if i find one cheap enough, and use it to power the adf part.
hope this helps
Posted on Jan 17, 2009
The power supply for my HP5490 scanner (same as HP5470c with ADF) recently died. Here's what I learned, and how I fixed it...
There are two different power supplies -- one for the scanner only, and another if you have the scanner and automatic document feeder (ADF). Both have a 4-pin plug. The adapter for the scanner only puts out 12vdc, and uses only two pins. The adapter for the scanner w/ADF puts out 12vdc on those two pins, and 24vdc on the other two pins.
HP no longer carries either one. Extensive searching turned up a couple places with a direct replacement for the scanner-only (12vdc) supply, but not the scanner+adf supply (12vdc/24vdc).
My solution was to purchase two separate power supplies, cut off their plugs, and wire them together using the old power supply's cord and plug.
Both supplies must be 'switching' or 'regulated' supplies. The 12vdc must be rated for 1.5A (1500mA) or higher. The 24vdc must be rated at 0.8A (800mA) or higher. Any supplies that meet those specs will work. I purchased the following two supplies from www.powerstream.com:
PST-AC2419 24v 1.9a $23
PST-F10242-ROHS 12v $25
Cut the cord with 4-pin plug off the old (bad) 12/24v supply, and expose/strip the wire ends. If your old supply was p/n 138-2030-IP3, the wires will be as follows: (shield=ground, black=common, red=+12v, white=+24v). If you had a different supply, you will need to determine which wires are which by checking continuity from the plug pins (pin layout is described later in this message).
Cut the 12/24v plugs off the two new supplies, expose and strip the ends. You'll need a meter to determine which conductor is ground and which is positive. For the supplies mentioned above, the wires are as follows: PST-AC2419 (Black=ground, White Stripe=+24v), PST-F10242 (Shield=ground, white=+12v).
Connect and solder the grounds and commons together. Then connect the +24v and +12v to the appropriate conductors. Wrap connections with electrical tape and/or shrink tubing.
If you have a meter, plug in the two supplies and test the voltages on the 4-pin connector. With the "flat" of the connector to the right, the pins should measure as follows: top-left 12v ground, top-right +12vdc, bottom-left 24v ground, bottom-right +24v.
Plug it in and your scanner should work again!
Posted on Aug 01, 2008
I have the same model. The hole for the power cable connection is beneath the "ledge" about one inch from your right right side as you look at the BACK of the scanner. There's a data connector next to it that goes to the ADF. This is the opposite side from where the USB cable plugs in.
Posted on Mar 28, 2008
A few people have said their scanner just died, or powered off while in use. This happened to me. Has anyone tried a new power adapter?
Posted on Dec 18, 2007
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