Question:
How do I fix a printer that won’t power on at all? I checked the power supply, and it outputs 93 volts AC and 41 volts DC.
Answer:
Regarding your power supply readings, I suspect there may have been a slight misunderstanding. If the input to the power supply is reading 93 volts AC, that is slightly lower than the required range of 100-110 volts AC. The output of a typical 3-pin power supply should have:
- Ground to Middle Pin: 40 to 42 volts DC
- Ground to Standby Pin: 1.3 to 1.5 volts DC
From what you described, it seems like your power supply is functional and providing the correct output. Therefore, the problem likely lies inside the printer. Here are the most common causes and troubleshooting steps:
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Mainboard Failure: One of the most common reasons a printer fails to power on is a malfunctioning mainboard. Electrical damage, short circuits, or failed components on the board can prevent power from being distributed properly. If you’re comfortable working with electronics, inspect the mainboard for burnt components, discolored areas, or visible damage.
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Loose Internal Connections: Over time, vibrations, handling, or repairs can cause internal cables to come loose. Specifically, check the connections between the power supply and the mainboard. Carefully disassemble the printer (while following safety precautions) and ensure all cables are firmly seated in place.
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Faulty Power Button: The power button itself can sometimes fail due to wear and tear. To test this, use a multimeter to check for continuity when the button is pressed. If you don’t detect continuity, the power button may need to be replaced or bypassed temporarily to test the printer.
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Firmware Corruption: In rare cases, corrupted firmware can prevent the printer from initializing and powering on. Unfortunately, reflashing the firmware usually requires professional tools and expertise, so this may need further servicing if other checks don’t resolve the issue.
Addressing printer issues can be complex because they often require hands-on troubleshooting. While I’m unable to provide remote repair support, we do offer an in-person evaluation and repair service through our local diagnostic facility: BCH Printer Repair Service (https://bchtechnologies.com/printer-repair-service). Repairs are conducted on a first-come, first-served basis, so it may take a few weeks before we can assess your printer.
For those looking to save on repair costs, I highly recommend self-help through online research. Start by checking our YouTube channel homepage (BCH Technologies YouTube [https://youtube.com/@bchtechnologies]) and using the search function next to the “About” tab to locate specific videos. With over nine years of content, it’s the most efficient way to find solutions, and YouTube might also suggest relevant videos from other creators to assist you.