Brother RH-9820 Service Manual page 231

Communication and memory-related errors
Code
Connection error detected between the main
E401 P.C. board and power supply motor P.C.
board when the power was turned on.
Communication error detected between the
E403 main P.C. board and PMD P.C. board when
the power was turned on.
Communication error between main P.C.
E410
board and panel P.C. board detected.
Communication error between main P.C.
E411 board and power supply motor P.C. board
detected.
No CF card is inserted.
E420
(No messages are displayed.)
E422 Error occurred while reading CF card.
E424 Insufficient free space on CF card.
E425 Error occurred while writing to CF card.
Problem with flash memory on main P.C.
E430
board.
E440 Problem with EEPROM on main P.C. board.
Model selection cannot be read from the
E450
machine head memory.
Data cannot be backed up to machine head
E451
memory.
E480 Problem with RAM on main P.C. board.
[P.C. board and connector positions]
Power supply P.C. board
Cause Remedy
Turn off the power, and then check that connector P17 on
the main P.C. board and connector P6 on the power
supply motor P.C. board are properly connected.
Turn off the power, and then check that connector P16 on
the main P.C. board and connector P1 on the PMD P.C.
board are properly connected.
Turn off the power, and then check that the operation
panel connector P1 is connected at the main P.C. board.
Turn off the power, and then check that connector P17 on
the main P.C. board and connector P6 on the power
supply motor P.C. board are properly connected.
Turn off the power, and then insert a CF card into the CF
card slot of the control box.
Check the data on the CF card.
Use a different CF card.
Use the specified type of CF card.
Turn the power off and then back on again.
Turn the power off and then back on again.
Turn off the power, and check the connection of the
machine head memory connector P3 at the power supply
motor P.C. board.
Turn the power off and then back on again.
Turn the power off and then back on again.
PMD P.C. board
RH-9820
9. ERROR CODES
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Main P.C. board
0535B
222