Faulty power cords and connections are an uncommon but possible cause of a printer not turning on. Before suspecting a cord failure, ensure that there is power to the wall outlet and there are no conditions preventing the printer from turning on. Testing by substitution can confirm if a cord connection is the problem.
Check for No Power Conditions
The power button on most printers is a soft-power switch that is connected to the printer's electronics and does not physically connect and disconnect power. Depending on the make and model of the printer, software may prevent the switch from operating if it is held down too long or too briefly, or if any printer doors or access panels are open. To restart a printer, unplug all cords, wait at least 30 seconds and then plug in only the power cord. Larger printers may have a physical power switch located under an access panel or near the power cord.
Power Supply Configurations
Larger printers have a single power cord from the wall outlet to the back of the printer. The AC adapter is built into the printer, and the cord may or may not be removable. Smaller printers have external AC adapters or transformer boxes. These may be built into the wall plug, or there may be a power cord that runs from the wall outlet to the adapter, and a thinner cord that connects the adapter to the printer. The different cords and adapter may be permanently wired together or have multiple plugs.
Printers With Built-in AC Adapters
If the printer uses a single cord which cannot be detached, it is not possible to test the cord. If power at the wall outlet has been confirmed and there are no conditions preventing the printer from turning on, professional service is required. If the cord is detachable, the printer end is likely the common C13 connector also used by monitors and computers. Use another one of these cords to determine if the original is faulty.
Printers With External AC Adapters
If the printer uses a detachable power cord between the wall outlet and the AC adapter, another cord can be used to determine if the original is faulty. A different AC adapter and low-voltage cord can only be tried if they are intended for that make and model of printer. Alternatively, the adapter and low-voltage wiring could be tested by using them for a different printer of the same make and model. If the adapter and low voltage wiring cannot be tested, they can be taken to a computer specialty shop. If there is electrical power at the wall outlet, and there are no conditions preventing the printer from turning on, the adapter or the low voltage wiring are likely defective.
Advanced Testing of an AC Adapter
An electrical meter can be used to confirm operation of an AC adapter and conductivity of the low voltage wires. A common problem is a break in the wires at the plug. This can be resolved by replacing the plug. Replacement plugs are available at electronics specialty stores and online. To prevent injury, fire hazards and damage to the printer, voltage measurements and plug replacements should only be done by people with skills and training in electricity and electronics.
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