Initial Adjustment Of Pwm Value (Aging Of The Head/Carriage Unit) (Function Code 69) - Brother MFC620CN Service Manual

8.5.17 Initial Adjustment of PWM Value (Aging of the Head/Carriage Unit) (Function code 69)

Function code 69 is not supported in the maintenance program embedded in the flash ROM of the
MFC210C U.S.A./Canadian models. To use Function code 69 in these models, you need to
temporarily load the full maintenance program onto the flash ROM. Refer to
Function
This function obtains the initial value of the PWM by aging the head/carriage unit and writes it
onto the EEPROM.
This aging procedure should be performed if you replace the head/carriage unit, carriage motor, or
CR encoder strip or if you loosen the timing belt.
NOTE: Opening the scanner unit during the aging procedure will result in an error. If you perform
this aging procedure with the scanner unit opened, the machine will slowly age the head/carriage
unit resulting in an error after completion of the aging.
Operating Procedure
(1) MFC620CN/425CN/420CN/410CN/215C/210C and FAX2440C
Press the 6 and 9 keys in this order in the initial stage of the maintenance mode.
DCP315CN/310CN/120C/117C/115C/110C
Enter 6 and 9 in the initial stage of the maintenance mode by using
(*To enter a numerical code on models having no numerical keypad, press the
display the numerical code to be entered and then press the Set key. Repeat this operation for each
numerical code.)
The machine starts aging the head/carriage unit, showing the "CR AGING" on the LCD.
In each of travel speeds 40, 33.3, 32.0 and 20, the machine checks whether the maximum and
minimum speeds are within the specified range.
If both are within the range, the machine automatically returns to the initial stage of the
maintenance mode.
If either one is out of the range, the machine beeps and shows some message, e.g., "40O 33X
32X 20O" on the LCD. This sample message indicates that the speed variation is within the
allowable range when the head/carriage unit travels at 40 or 20 inches/sec.; however, it is out
of the range at 33 or 32 inches/sec.
To return to the initial stage of the maintenance mode, press the Stop/Exit key.
8 - 4 2
Section 8.1.
and Set keys.*
key several times to
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