Brother International HL-3400CN Service Manual - Page 170

CHAPTER

5

CONTROL

PANEL

OPERATION

PR2001003

3.4.2

Setting

of

engine

NVRAM

data

As

data

in

the

NVRAM

has

been

preset

to

the

optimum

value

at

the

factory,

it

is

not

necessary

to

change

the

preset

values

under

normal

conditions.

However,

fine

adjustment

may

be

required

subject

to

the

media

or

operational

conditions.

<Purpose>

Print

quality

can

be

improved

by

changing

the

preset

value

in

the

engine

NVRAM.

<Procedures

of

Setting>

(1)

Follow

the

procedures

set

out

in

Section

3.3

`Service

Mode'

in

this

chapter.

(2)

Select

RAM

TUNE

UP

mode.

(3)

Select

the

desired

TUNE

UP

mode.

(4)

Adjust

the

preset

value

to

the

appropriate

value

(step).

(5)

Carry

out

a

test

print

to

confirm

the

print

quality.

<Subject

TUNE

UP

Mode>

Mode

Subject

of

Adjustment

Purpose

LP

TUNE

UP

Adjustment

of

laser

power

Optical

density

THV

TUNE

UP

Adjustment

of

transfer

voltage

Transfer

efficiency

DB

V

TUNE

UP

Adjustment

of

developer

bias

Optical

density

CB

V

TUNE

UP

Adjustment

of

OPC

belt

bias

Optical

density

FBV

TUNE

UP

Adjustment

of

cleaning

roller

bias

Drum

cleaning

efficiency

ADC

TUNE

UP

Adjustment

of

paper

discharging

output

bias

Reduction

of

winding

paper

jam

around

the

drum.

5-48

Brother International HL-3400CN Service Manual - Page 170

Brother International HL-3400CN - Color Laser Printer Manual

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