HP LASERJET 9065 User Manual download pdf (Page 61)

ENWW Laser scanner unit 53

MFP unit explanation

*2 Light source

Conventionally, two parallel beams

were generated from two laser beams.

The laser diode adopted for this

machine can generate two beams using

a single chip, requiring neither

fine-adjustment prism nor beam

composition prism.

M15 (polygon) control

M15 (polygon) is driven by PMDB (polygon

drive board) and is controlled by PRCB

(printer control board).

1 Operation

a Explanation of operation

M15 is a 3-phase brushless DC motor

which is driven by the 3-phase bipolar

method. The current flowing through the

coil is switched according to the position

of the rotor detected by the position

sensor (magnetic sensor) in the motor.

This motor rotates the polygon mirror to

scan the laser beams from LDB (laser

driver board) in the axial direction of the

drum. Its rotation is held constant by

PLL control.

b Rotational speed

M15 is powered by 24 VDC and its

rotational speed is as follows:

2 Signals

a Input signals

1 POLM_LOCK (PMDB to PRCB)

This signal indicates the clock

synchronization state of M15

(polygon).

[L]: Synchronous (normal)

[H]: Asynchronous (abnormal)

b Output signals

1 POLM_CONT (PRCB to PMDB)

This signal turns on/off M15.

[L]: M15 on

[H]: M15 off

2 POLM_CLK (PRCB to PMDB)

This is a reference clock signal for

PLL-controlling M15 in PMDB.

Image write control

The analog image data from the CCD sensor

is A/D-converted by the ADB (A/D converter

board), then sent to the ICB (image control

board) for data processing. The processed

image data is converted into a laser beam

on the LDB (laser driver board), and then the

Rotational

speed

Linear speed 9055 9065

37,795 rpm 320 mm/s - normal

33,070 rpm 280 mm/s normal -

21,850 rpm 185 mm/s thick paper

PMDB

M15

PRCB

24V1

P.GND

POLM CONT

POLM CLK

POLM LOCK

DCPS

24V/1

5V/2

S.GND

P.GND

ICB

INDXSB

5V

SGND

/IND

SGND

/INDPR

LDB

GND

VIDEO2

/VIDEO2

GND

LPR5V

LD5V

LD5V

GND

VIDEO1

/VIDEO1

GND

/ENB1

/S/H1

/ALM1

GND

/ENB2

/S/H2

/ALM2

GND

DADI

DACLK

DALD

ADB

CCD

DCPS

24V1

5V2

S.GND

P.GND

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