The service Manual says that if both the ready (Bulb) light and the exclamation light are both on it is a invalid engine
code /Invalid network code. But to clarify that you say they are both on and solid and not blinking. If they are you have a bad main board.
If they are blinking then the error is a Flushing /Resolution reduced error.
The cause is:
Printer is processing data or printing pages,but the resolution of a page in the current print job is reduced from 600 dots per inch (dpi) to 300 dpi to prevent a memory full error.
Solution is:
Wait until the ready light is displayed to print other jobs.
• Press and release the triangle button to cancel print job. It is the lower of the two buttons.
• Press and hold the traiangle button again to reset printer.
Hope this helps
Bruce
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