Brother MFC-9420CN Service Manual page 196

Sequence of Assembling
(1) Install the transfer unit PU into the printer.
(2) Secure the transfer unit PU with the knob screw (2 pieces).
(3) Close the rear cover.
< How to reset the 120K Kit >
(1) Press the Menu/Set, Black Start,
mode.
(2) Press the 8 and 0 keys in this order to indicate the LOG INFO message on the LCD, and
press the Black Start key several times until the "120K_CH:" message appears.
(3) Press the 2, 7, 8 and 3 keys in this order to reset the counter of the 120K Kit.
(4) Press the 9 key twice so that the printer returns to the standby status.
CAUTION
• This work is one of periodic replacement jobs, but cannot be the customer. This should be
implemented upon request of customer or at periodic maintenance.
• After the replacement, confirm the improvement of print quality failure by test print.
Fig. 6-27
, , and keys in this order to enter the maintenance
6 -2 1
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