Brother MFC620CN Service Manual page 349

[ 2 ] "MACHINE ERROR 4F" error message
The error message "MACHINE ERROR 47" appears if the head drive voltage drops from the high
to low level in an abnormally short period. The source of the problem is either the head/carriage
unit or power supply PCB.
Check
Head/carriage unit
Power supply PCB
Main PCB
[ 3 ] Ink-related problems
Problems of this nature may arise not only due to machine malfunction but also to the user's actions.
IMPORTANT: In many cases, the user fails to set ink cartridges in place.
Problems due to the user's actions
Check
Ink cartridges
Data setting
required after
replacement
Possible causes
- The carriage-head flat cable is
disconnected from the carriage
PCB.
- Piezoelectric (PZT) ceramic
actuator defective (Cracks or rare
short)
- A power failure when the
machine was in operation
resulted in a damaged part.
- Exposure to power surges caused
by lightning damaged electronic
devices on the power supply
PCB.
Voltage detection circuit defective
Possible causes
- Ink cartridges are not inserted
fully into the ink refill ASSY.
- One or more of the ink cartridges
are not loaded.
- One or more of the ink cartridges
has run out of ink.
The related ink dot counter(s) was
not reset after replacement of ink
cartridge(s).
9 - 3 6
Problems that may result
At the start of printing or head
cleaning operation, correct
voltage will not be applied to
the electrodes on the surface of
the PZT ceramic actuator
(described in Chapter 3,
Section 3.2.2.2).
The head drive voltage will be
too low to drive the print head.
The head drive voltage
becomes too high or low.
Problems that may result
The machine will not be able to
print.
After the machine is used for a
while, the "INK EMPTY
XXX" message will appear and
the machine will no longer be
able to print.
Confidential