HP Laserjet 1536dnf MFP Blinking ready light and exclamation mark

[Deliz]

After replacing low voltage power supply and formatter board HP Laserjet 1536dnf MFP blinking ready light and exclamation mark. 

[Betty0610]

@Deliz

Welcome to the HP Support Community.

Do you get any error message?

Let's try to reset the Printer here as it helps in removing any stored static electricity from the Printer which might be causing these issues.

1. Turn the printer on, if it is not already on.
2. Wait until the printer is idle and silent before you continue.
3. With the printer turned on, disconnect the power cord from the rear of the printer.
4. Unplug the power cord from the wall outlet.
5. Wait at least 60 seconds.
6. Plug the power cord back into the wall outlet.
7. NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
8. Reconnect the power cord to the rear of the printer.
9. Turn on the printer, if it does not automatically turn on.
10. Wait until the printer is idle and silent before you proceed.

Try to print. If the issue persists, continue to the next step. Also, try connecting the Printer to a different wall outlet directly.

Let me know if this helps.

If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution and Kudos buttons, that'll help us and others see that we've got the answers!

Thanks!

Have a great day!