Brother HL 5370DW, Service Manual

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7-13 Confidential
21) Developer Roller Counter Reset 1 (Ineffective)
21) Developer Roller Counter Reset 2 (For the standard toner cartridge)
21) Developer Roller Counter Reset 3 (For the high-capacity toner cartridge)
Since print density is likely to become darker as toner is getting older, the developing
bias is lowered by degrees according to the number of prints so that an almost fixed
density can be maintained from the start of the use of brand-new toner to the end of it.
The value of the developing bias is printed on the maintenance sheet. The developing
bias is a parameter which depends on the developing assembly, so it needs to be reset
when the developing assembly is replaced. At that time, the developing roller counter
reading is also reset. This mode is to enable to execute these operations (equivalent to
those done when the developing assembly is replaced) manually from the service
mode.
22) Fixed USB Speed Mode
This allows you to switch the setting of Full fixed/Auto switching (HIGH/FULL) of the
USB speed. Whenever switching, the current setting is changed to the other one.
The default setting is Auto switching.
It also allows you to check the selected setting by the Toner LED (Full fixed) or Drum
LED (Auto switching) being lit for 1 second when releasing the [Go] button.
LED Model LCD Model
When switch the
setting from Auto
switching to Full
fixed. Toner LED lights
for 1 second. Data LED is
OFF.
When switch the
setting from Full
fixed to Auto
switching. Drum LED lights
for 1 second. Data LED is ON.
Back
Cover
Toner
Drum
Paper
Status
Back
Cover
Toner
Drum
Paper
Status