HP Printer Error Code 70: How to Fix It
Hard 30-90 minutes depending on cause Medium Severity
Verified June 2026
- Error Code
- 70
- Brand
- HP
- Product Type
- printer
- Severity
- Medium
- DIY Difficulty
- Hard
- Estimated Fix Time
- 30-90 minutes depending on cause
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Tools You'll Need
- Phillips head screwdriver
- Flathead screwdriver
- Lint-free cloths
- Multimeter (optional, for testing power supply voltage)
- Anti-static wrist strap
- HP printer service manual (model-specific)
How to Fix Error Code 70
-
Power Cycle the Printer
Always unplug the printer from the wall before opening any panels or touching internal components. -
Check the Power Source and Outlet
Do not use a multimeter on live outlets unless you are trained and comfortable doing so safely. -
Inspect and Reseat Internal Cable Connections
Unplug the printer completely before touching any internal components. Static discharge can damage circuit boards — ground yourself by touching a metal surface before handling electronics. -
Remove and Reinstall Toner Cartridges and Imaging Drum
Avoid touching the green drum surface on imaging units as this can damage them permanently. -
Update or Reinstall Printer Firmware
Do not power off the printer during a firmware update — this can permanently damage the device. -
Test and Replace the Power Supply Unit
Replacing the PSU requires disassembling internal printer components. Ensure the printer is fully unplugged and discharged before proceeding. If you are not comfortable with electronics repair, skip to calling a professional. -
Replace the DC Controller Board
Use anti-static precautions when handling the DC controller board. Unplug the printer entirely before replacing this component. If you are not confident in this repair, have a certified HP technician perform it.
Parts You May Need
DC Controller Board
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Internal Power Supply Unit (PSU)
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Ribbon Cable / Internal Wire Harness
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Printer Power Cord
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DC Controller Board
Check Price on Amazon
Internal Power Supply Unit (PSU)
Check Price on Amazon
Ribbon Cable / Internal Wire Harness
Check Price on Amazon
Printer Power Cord
Check Price on Amazon
DC Controller Board
Check Price on Amazon
Internal Power Supply Unit (PSU)
Check Price on Amazon
Ribbon Cable / Internal Wire Harness
Check Price on Amazon
Printer Power Cord
Check Price on Amazon
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When to Call a Professional
If you have completed all steps — including checking cables, updating firmware, and replacing the power supply — and Error Code 70 still appears, the DC controller board has likely failed and needs professional replacement. You should also call a certified HP technician or printer repair specialist if your printer is still under warranty (DIY repairs can void the warranty), if you are uncomfortable disassembling internal components, or if you see any signs of burning, melted plastic, or electrical damage inside the printer. In these cases, repair costs may exceed the printer's value, so a technician can help you decide whether repair or replacement is more cost-effective.Frequently Asked Questions
What does HP Printer Error Code 70 mean?
Error Code 70 on an HP printer indicates a DC controller failure. The DC controller board is responsible for managing power distribution and communication between the printer's internal components. When it malfunctions or loses power, the printer halts and displays this error.
Can I fix HP Error Code 70 myself?
Yes, in many cases. Simple fixes like power cycling, reseating cable connections, cleaning cartridge contacts, and updating firmware are all DIY-friendly. However, if the issue is a failed power supply unit or DC controller board, the repair becomes more technical and may be better suited for a professional technician.
How much does it cost to fix HP Printer Error Code 70?
If the fix is a simple cable reseat or firmware update, the cost is zero. A replacement DC controller board typically costs between $30 and $150 depending on the HP printer model. If you hire a professional technician, labor costs typically add $50 to $150. For older or lower-end printers, replacement may be more economical than repair.
Will a factory reset fix HP Error Code 70?
A factory reset can sometimes resolve Error Code 70 if the cause is a firmware or software issue. To perform a factory reset, access the printer's control panel menu, navigate to Setup or Printer Maintenance, and select the Restore Factory Defaults option. However, if the error is caused by a hardware failure such as a damaged DC controller or power supply, a factory reset will not fix the problem.
Is Error Code 70 on an HP printer serious?
Error Code 70 is a medium-severity error. It prevents the printer from operating until the underlying issue is resolved, but it does not indicate catastrophic damage in all cases. Many instances are caused by loose connections, power issues, or firmware problems that are straightforward to fix. However, if the DC controller board itself has failed, it is a more significant hardware issue that may require professional repair.