⚡🖨️ HP 31V 2.42A 75W Printer Adapter
 
(31V DC • 2420 mA • 4.8 mm × 1.7 mm Barrel • No Pin)

This high‑wattage AC adapter delivers 31V of regulated DC power to HP’s larger multifunction inkjets. With a 75W capacity, it was the standard supply for OfficeJet, Photosmart, and PSC all‑in‑ones in the mid‑2000s.
 
🔧 Charger Form
Input: 100–240V AC, 50/60Hz
Output: 31V DC, 2.42A (75W)
Connector: 4.8 mm outer / 1.7 mm inner barrel, no center pin
Common part numbers: 0957‑2125, 0950‑4484, 0950-4483, PA‑1750‑03HB
 
🖥️ Compatible Devices
🟦 HP OfficeJet Series
OfficeJet 7200 series (7210, 7310, 7310xi, 7410, 7410xi)
OfficeJet 7300 series
OfficeJet 7400 series
🟦 HP Photosmart Series
Photosmart 2600 series (2610, 2610v, 2610xi)
Photosmart 2700 series (2710, 2710xi, 2713)
Photosmart 8150, 8450
🟦 HP PSC / All‑in‑One
PSC 2500 series (2510, 2550, 2575)
 
✅ Common Uses
🔌 Powering HP’s larger all‑in‑one inkjets with scanner, fax, and photo printing
🧩 Replacing lost or damaged OEM 75W adapters
🧪 Testing OfficeJet/Photosmart/PSC printers with a known‑good high‑wattage supply
 
🧠 Signal Format
⚡ Input: Universal AC (100–240V)
🔋 Output: Regulated 31V DC, 75W max
🔌 Simple 2‑wire barrel, no center pin
🔁 Not interchangeable with HP’s 30V 830 mA or 32V/16V dual‑rail adapters
 
⚠️ Things to Watch Out For
📉 Connector looks similar to 30V and 32V HP bricks — but is not cross‑compatible
🔌 Slightly larger barrel (4.8 mm) than the 4.7 mm used on smaller printers
🧯 Using the wrong adapter can cause “printer not recognized” or power faults
🧪 Always confirm the printer’s underside label (31V 2.42A) before plugging in
 
🛠️ Quick Tips for Beginners
🧭 Check the printer’s underside for “31V 2420 mA” rating
🔌 Use only with printers that accept the 4.8 mm × 1.7 mm barrel
🧪 If printer won’t power on, inspect barrel tip for wear or oxidation
🧯 Label adapters clearly to avoid mix‑ups with HP’s 30V or 32V bricks
🧵 Keep one in your collection to cover HP’s high‑wattage all‑in‑one era