Sensitivity Adjustment Of Density Sensor (Function Code 72) - Brother HLL3290CDW Service Manual

1.3.26 Sensitivity adjustment of density sensor (Function code 72)

< Function >
This function is used to print the patch data for density sensor sensitivity adjustment on the
belt unit and measure the density with the density sensor. The characteristics of the density
sensor are calculated based on the value measured by the density sensor, and the parameter
for correcting developing bias voltage is adjusted.
< Operating Procedure >
(1) For models with touch panel
Press the [7] and [2] in this order in the initial state of the maintenance mode. "PLS WAIT
72" is displayed on the LCD and performs the sensitivity adjustment of the density sensor.
For models without touch panel
Press the [▲] or [▼] in the initial state of maintenance mode to display
"MAINTENANCE 72" on the LCD, and press the [OK]. "PLS WAIT 72" is displayed on
the LCD and performs the sensitivity adjustment of the density sensor.
(2) When this operation is completed without errors, "OK" is displayed on the LCD.
(3) Press the [X] or [Stop], and the machine returns to the initial state of maintenance mode.
Note:
If the sensitivity adjustment of the density sensor fails, "ERROR 72" is displayed on the
LCD. Display the error message by pressing the [▼], and take the following remedy that
corresponds to the error message.
Error display
dens_l_drk_err
belt_err
dens_pat_err
dens_calc_err
dens_led_adj_err
lph_calc_err
TONER EMPTY #
Cover is Open
Replace Toner
* # indicates the toner color (Y, M, or C) of which cartridge became empty.
• Reconnect the harness of the eject sensor PCB.
• Replace the registration mark sensor ASSY.
• Replace the main PCB.
• Replace the belt unit.
• Replace the waste toner box.
• Replace the registration mark sensor ASSY.
• Replace the main PCB.
• Check if the toner cartridges are set in the correct order of colors.
• Replace the toner cartridges and drum unit.
• Replace the registration mark sensor ASSY.
• Replace the main PCB.
• Replace the belt unit.
• Replace the waste toner box.
• Replace the registration mark sensor ASSY.
• Replace the main PCB.
• Replace the toner cartridges and drum unit.
• Securely close the top cover.
• Wipe the LED ASSY with a soft, lint-free cloth.
(Refer to Fig. 2-15
• Re-assemble the LED ASSY.
*
Replace the empty toner cartridge and press the [Start] or [Mono
Start] to clear the error. Perform the sensitivity adjustment of the
density sensor again.
Close the top cover.
Replace the black toner cartridge and press the [Start] or [Mono
Start] to clear the error. Perform the sensitivity adjustment of the
density sensor again.
5-62
Remedy
(P2-118).)
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