Brother HL 5370DW

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I just found this solution from an alternate site… (it worked for my 5370dw):

How to Identify and Fix Common Problems ?

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All of the LEDs flash to indicate a Service Call Error, which is a malfunction of one of the hardware components of the machine. 1. Power the machine off by holding down the POWER button.
The Ready (Green) LED is flashing. The Toner, Drum and Error LEDs are off. The machine is warming up.
The Paper LED flashing can be caused by no paper in the manual feed slot, a paper jam, the front cover is open, the back cover is open, dust on the drum, or not having a drum installed. Be sure that the drum unit and toner cartridge assembly is installed in the machine before continuing.
If the orange light flashes at 0.5 second intervals, the printer is in Cooling mode. Wait until the Status LED stops flashing.
[Settings]>[All Settings]>[Initial Setup]>[Reset]. to display the type of reset functions, and then press the reset function you want to use. The LCD displays [Machine will reboot after resetting. Press [OK] for 2 seconds to confirm.].
A flashing green light on a traffic signal means the signal is pedestrian activated.
There are two indicator lights on the printer: the Status light and the Charging light. Each indicator light shows the status of the printer as described below. Status indicator light: A blue or green light indicates the printer is operating correctly, while red indicates an error has occurred. Indicator light color.
This condition occurs when at least one ink cartridge needs attention, is faulty, incorrect, missing, damaged, or incompatible. Reseat both ink cartridges, clean the ink cartridge contacts, restart the printer, and replace one or both ink cartridges if necessary.
The blinking power light indicates that the unit has a cartridge problem. There could be several reasons for this: 1. Incorrect, defective or swapped cartridges.
If your router is blinking orange, it is likely getting an upgrade and you should give it time before doing anything. However, if your internet is unavailable or slow, it can get stuck and the blinking will not stop. Resetting the router and the modem normally resolves the problem and restores the connection.
The Drum LED blinks if the drum unit is near the end of its life. Use the drum unit until you have a print quality problem, then replace the drum unit with a new one.
Power down the printer and then unplug the power cord from the printer and the wall. Wait for a minute, then plug the printer back in. The printer will reset and turn on.
Unplug and restart your printer

Sometimes power cycling your printer can resolve the issue. Turn off your printer and unplug it, wait 30 seconds, plug your printer back in, and then turn the printer back on.

Traffic control signals that normally operate red, green, and yellow may be set to “flashing” mode for various reasons. If there is construction or a broken signal, for example, flashing lights may be used to indicate a change in traffic flow.
Flashing lights

Flashing RED traffic light (stop signal) means the same as a stop sign. You must come to a full stop and then you may go when it is safe to do so. Flashing YELLOW traffic light (caution signal) means slow down, check for cross traffic and proceed with caution through the intersection.​

If your PC or the LCD screen on your printer is telling you that your ink cartridges are full but no ink is passing through to the paper, then it`s most likely that you are dealing with a clogged printhead. Blurry documents and images that appear faded are also signs that it`s time to remove the excess ink.
Usually a quick paper setting adjustment will clear up a ghosting issue right away. Run a cleaning – Most printers have a cleaning function built into the machine. Run this a couple of times to attempt to clear up the printing issue. Inspect the drum – Sometimes excess toner powder can stick to the drum.
It is most likely that your image is yellow where you were expecting it to be red and you may also notice that blue parts of the image appear turquoise instead. Both of these effects are caused by a lack of magenta ink/toner on your prints. Magenta is added to both cyan and yellow to create these common colours.
Chances are that the flashing lights are an indicator that a printer component is malfunctioning. HP has a diagnostic tool called the “Print and Scan Doctor” that can help you find the broken part.
Print blemishes after inserting a new cartridge. Slow print times. Abnormal noises. Paper jams and ripped paper.
Install an appropriate canon ink cartridge. If the lamp on the ink tank is flashing, ink may have run out. Replacing the ink tank is recommended.
Power Ink Flushing affects the service life of the ink pads by causing them to reach their capacity sooner. When an ink pad reaches the end of its service life, the product stops printing and you must contact Epson for support. Flushing the Ink Using a Computer Utility.
The printer is offline.
The Toner (Yellow) LED is flashing. The Drum, Paper and Ready LEDs are off. The toner cartridge is not installed correctly. Remove the drum unit, remove the toner cartridge from the drum unit, and put the toner cartridge back into the drum unit.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Brother HL-5370DW – All lights flash in unison
ANSWER : I just found this solution from an alternate site… (it worked for my 5370dw):

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Brother HL 5370DW

Brother HL-2040 Drum Light Driving Me Crazy!
ANSWER : Cleaning the drum unit with QTip dipped in alcohol did not get rid of the drum light. But I shined the inside of the printer and saw lots of toner. Cleaning it with the QTip dipped in alcohol where the drum unit would be inserted did get rid of the drum light! Saved me lots of money, I had bought two drum kits before to get rid of the drum light but it turned out the printer inside was dirty. So could have saved lots of money! Thanks to this forum for bringing it to my attention. So far this printer has been working for over 10 years and the parts are cheaper now.

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Brother HL 5370DW

Flashing Amber light
ANSWER : Make 1) check that the back of tray that is adjustable is against the paper and 2) the paper sensor for the tray moves freely – if it gets stuck it will cause that error.

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Brother HL 5370DW

All lights flashing on turn on
ANSWER : If it is new, return it and get a replacement.

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Brother HL 5370DW

Brother MFC 8220
ANSWER : This problem is normally caused by the fuser. There’s a brown driver gear who frequently broke and you’ll be obliged to replce it to take care of the problem.

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Brother HL 5370DW

4F displayed on Brother 990CW printer?
ANSWER : That’s a printhead error.

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Brother HL 5370DW

Brother J315W – paper misfeed
ANSWER : I have the same problem: whether printing or copying, the paper feeds almost up to the print head and then stops with a paper jam error. Can’t find any bits of paper stuck anywhere. Sure would appreciate some help. DCP-J315W

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Brother HL 5370DW

Brother MFC-J6510DW extra paper tray.
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Brother HL 5370DW