Anyone can help me with my DCP-T720DW printer, machine error 7E00.How can I fix this?

Question edited for full 'make model (what it is)'.

We don't mean anything, we are Fixya not DCP-T720DW or Brother.
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Communications error

https://www.google.com/search?q=Brother+DCP-T720DW+error+3000

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https://help.brother-usa.com/app/answers/detail/a_id/145040/~/unable-to-print-e3

This video maybe will help you

How to Reset Purge Counter on Brother DCP 195C or DCP 197C Printer

Resetting the purge counter must fix your problem

The hard drives are in a USB externa enclosure, set up as RAID 1 and are formatted as Mac OS Extended (Journaled). I do not save any TM back ups to them and they work after a restart and then sometime later start to provide the error message anytime I try to save to them. A restart usually fixes the issue for a finite period of time. Disk Utility runs and tells me the disks are fine. I never have trouble accessing data from them.
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error code EC

Hi. I had unable to print and unable to init 46 error. Any help available to reset my machine please. Thank you

error 44 dcp 130/mfc 240/440 etc.:

abnormally high temperature within print head.

You have two choices to TRY to fix it:
1. put in new carts. press menu then start copy b/w then  fourtimes arrow up button (AUB) quickly one after another.

press by help of AUB and OK:
7 - (Ok) 6  - (ok) 4 (ok) then start b/w copy to initiate the carts and let the machine do some power cleaning.

leave the maintenance mode by pressing AUB 9 (ok)  and 9 again.

2. Make sure that the ph is at correct position simply by pressing on it from top (power up machine. wait til ph runs to left side. unplug from power. simpl press onto the ph). replug to power.

If you still receive the error the ph is defective due to bad generic ink and needs replacing.

you have to replace the print head.

But to be honest: its cheaper to buy a new dcp 135c or 130c with warranty and new carts incl.....

you cant clean the waistinktank because when the felt dries up it wont take up any ink anymore! The rejected ink will flow into machine and cause serious demages!

Anyway you have forgotten to reset the eeprom code to tell the machine thta the ink absorberbox has been CHANGED!

Search here for error 46

48 = head cable problem

lift top of machine as if changing ink, there is a black cover that needs to be removed to expose head cable, check it is pluged into board fully

remove A, check cables at B