The ready light comes on,alarm lightand the data light.does not always print when needed I have togo through the print command again

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Try first unplugging power, and removing toner
check inside for foreign objects or fragments of paper
Open all doors and close them back , and plug back power.

Go into Test Print Mode
The printer incorporates various test print modes.
Select the test mode you want to use following the steps below;
(1) Turn off the power switch of the printer and check that the front cover is closed.
(2) Turn on the power switch while holding down the control panel button. Press the button
until the Drum LED comes on.
The Drum LED illuminates to indicate that the printer enters into the test print mode.
(3) If you want to execute the test print, release and then press the button again when the
Drum LED comes on.
or
Push "alarm" button : The printer is restored to the factory setting and permanent fonts and macros are cleared.
The printer returns to the ready status after
printing.
If it does not reset, replace the main PCB.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response
Thanks, Joe



I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

Service manual: ready and alarm blinking :
Paper Jam
Clear the paper jam and press the panel button if the printer
does not automatically resume printing.
Misfeed:
Re-install the paper and press the panel button.

Clear the jammed paper inside the printer. Press the panel button
if the printer does not automatically resume printing.

check the sensors:
1) Turn off the printer power switch, open the front cover, and remove the drum unit.
2) Turn on the printer while pressing the control panel button. The Drum LED comes ON.
3) Lightly press the panel button again.
Alarm LED is ON = Front registration sensor is turned ON.
4) Press and release the panel button again.
Drum LED is ON = Paper eject sensor is turned ON.

If sensors are On, paper is being detected, Off- no paper

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

Thanks, Joe

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

Because I was getting gray shading on my pages and data was still being printing, I decided to change the toner cartridge. Now the pages are clean and white and all the lights function properly. Most cartridges that are running on empty don't print any data at all or at least print the data at the top of the page and gradually gets fainter sp? on the page. Who would have thought just by changing the cartridge would solve the problem? So glad that's all it was........wasn't excited about having to buy a new printer.

Might have a paper jam in area of toner and drum cartridge that may need to be removed. Typically this will solve the issue.

I had the same problem after a resent power outage. Here's what fixed mine.

Turn the power switch off.
Wait a 15-20 seconds
While holding the button on the front panel down turn the power switch on.
After the drum light comes on release the button wait then press the button again.
Turn the machine off then back on again and you should be back in business.

To prevent the problem in the future if you are not using the printer turn it off and if the power goes off while printing get the printer turned off before the power comes back.

Alarm and Data lights on together is from low toner. If shaking of the toner cartridge is not helping, change the toner.
Drum light is usually on because of the print counter. If the print quality goes really bad, change the drum and reset the counter by holding the front button wile the front cover is open till all lights come on. Release the button and close the cover.
If just Data light is on, check the print ques, some jobs might got stuck there.

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).

tray this
The procedure for the factory inspection mode is as follows.
(1) Turn off the printer power switch, open the front cover, and remove the drum unit.
(2) Turn on the printer power switch while holding down the control panel button. The Drum
LED comes ON.
(3) Lightly press the panel button again.
(4) Check that all the LEDs except the Ready LED are OFF.
✒ If the toner sensor is ON, the Drum LED stays ON (error).
✒ If the front registration sensor is ON, the Alarm LED stays ON (error).
✒ If the upper paper cassette sensor is ON, the Data LED stays ON. (error) (HL-1250
only)
NOTE:
The lower paper cassette solenoid is turned ON/OFF even if the panel button is not pressed.
(5) Check the rear registration sensor.
✒ If the rear registration sensor is stuck backwards, the Ready LED stays OFF. (error)
✒ If the rear registration sensor is moved back and forth, the Ready LED comes ON at
any time. (error)
(6) Check that only the Data LED comes ON while pressing the panel button.
✒ If the paper eject sensor is ON, the Drum LED stays ON. (error)
✒ If the lower paper cassette registration sensor is ON, the Ready LED stays ON. (error)
If the registration sensor is ON, the lower paper cassette solenoid is turned ON, and
the Ready LED also stays ON. (HL-1250 only)
NOTE:
The lower paper cassette solenoid is turned ON/OFF even if the panel button is not pressed.
(7) Install the drum unit.
✒ Check that the Drum LED goes ON and the Ready LED goes OFF.
(8) Close the front cover.
(9) Continue to press the control panel button.
✒ Check that the Data LED stays OFF.
(10) Release the panel button.
(11) If all the sensors except the toner sensor are correct, the printer goes back to the Ready
status.
If any error is detected, the printer stays in the inspection mode.