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I've had this fault myself, If memory serves me right the control panel ( small though it is) we found to be the problem, once replaced the unit the displayed correctly, weirdly all functions of the printer were still available even though we were unable to see the display.
we were able to get config pages etc, and like you say the indicator lights were working- sort of - when they wanted to.
replace the diplay PWB ( its small and reasonably cheap)
To fix this- Restore to the factory settings: 1. Power OFF the printer and DISCONNECT any data cables. 2. Open the side cover. 3. While pressing the Continue and Cancel buttons at the same time, turn on the printer. 4. CONTINUE to PRESS and HOLD the Continue and Cancel buttons until ALL the indicators are turned on, then release the two buttons. 5. After the Continue, Error, and Ready/Data indicators go out, close the side cover.
The printer will: * Initialize the non-volatile memory (NVM). * Restart * Prints the Printer Settings and Device Settings pages.
CAUTION: DO NOT turn off the printer during this process or the printer will cease to function.
When the Ready/Data light is solid, press the Continue button to print a menu settings page and a network setup page. Select TCP/IP heading on the network setup page. There you can change your IP address.
Ok, try this--1.power off printer 2. open front door 3. press and hold continue and cancel buttons 4. power back on 5. wait until light sequence stops om error 6. power off and back on.
this resets factory defaults on the printer..
According to the operation manual: If alarm light and data light blink every 5 seconds- TONER LOW (purchase more toner and have it ready when the 'toner empty' is indicated). If alarm light and data light stay lit- TONER EMPTY (replace toner cartrige with new one).