HP ml 1640, ml 2240, ml 2241, ml 2245 Diagram

ML-2240 & ML-2245 & ML-1640 Series training

ML-2240 & ML-2245 & ML-1640 Series training

February 2008

February 2008

Agenda

Agenda

1. Overview

2. Block & Connection Diagram

3. Schematic – Key concept

4. Cover Open Sensing

5. Q&A

Ⅰ. Introduction

1-1. Overview(ML–2240 & ML-2245)

SMPS

HVPS

Main Board

Waste Sensor
(Only ML-2245)

Ⅰ. Introduction

1-2. Overview(ML–1640)

SMPS

HVPS

Main Board

Ⅰ. Introduction

2. Block & Connection Diagram of ML-2240 & 2245

Ⅰ. Introduction

2-2. Block Diagram of ML-1640

Ⅰ. Introduction

3. Schematic - Key Concepts
3-1. Main PBA – 1(ML-2240&2245)

Main Clock and SSCG

¾ SSCG means Spread Spectrum Clock Generator
¾ Apply SSCG(Spread Spectrum Clock Generator) on the Main Clock.
¾ Main Clock frequency is 12MHz and Video Clock is 14.75MHz.
¾ CPU makes video clock using internal PLL block.
¾ It doesn’t need extra Oscillator for video clock.

Ⅰ. Introduction

3-1. Main PBA – 2(ML-2240&2245)

CPU – Jupiter4e

¾ Jupiter4e is developed using ARM940T 32Bit RISC embedded processor core.
¾ 1.8V internal, 3.3V external(I/O boundary) Voltage used.
¾ Image processor included(GDI only).
¾ On-Chip clock genarator with internal PLL.
¾ Operating frequency is 75MHz ( converting 10MHz main clock to 75MHz operating

clock using internal PLL )

¾ It has Built in Flash Memory : 4MBits (128Kx32bits)
¾ 4Mbit is 0.5MByte. It is small capacity. So we can not store many function in it.

Ⅰ. Introduction

3-1. Main PBA – 3(ML-2240&2245)

SDRAM – 8MB * 1ea

¾ SDRAM(Max operating frequency : 133MHz) used and SDRAM has

8MByte memory capacity.

¾ SDRAM operates 75MHz which is the same as CPU’s operating

frequency.

¾ F/W program code had been stored in the Built-in Flash Memory

when Main PBA assembled , and the program code can be
upgraded by user.

¾ When upgrading F/W, never turn off the power until completing

upgrade process.

¾ If user turn off the power while upgrading F/W, the program code

will be conflicted and the machine will not work.

¾ If above situation occurs, replace the Main PBA.
¾ After downloading, set automatically conduct power off/on.

Ⅰ. Introduction

3-1. Main PBA – 4(ML-2240&2245)

EEPROM

Chip Select InputCS

Serial ClockSK

Serial Data OutputDO

Serial Data InputDI

Organization SelectORG

Supply VoltageVCC

GroundGND

¾ ML-2240 has EEPROM in order to store environmental data, total

page count data, dot counter data, etc…

¾ M93C66(4Kbit) EEPROM device is used.
¾ Read/Write operation is activated when the machine states go idle.
¾ While printing, Copying, scanning, EEPROM read/write operation

not activated.

¾ Because of above reason, if user turn the power off right after

printed page exit, there is no time for writing newer data that
results dot count and page count data not updated.

Ⅰ. Introduction

3-1. Main PBA – 5(ML-2240&2245)

Main Motor Control

(BLDC)

¾ ML-2240 drives the engine motor using BLDC Motor.
¾ BLDC Motor includes the motor driver IC and extra

circuits for driving the engine motor.

¾ The main board controls only 3 signals (ex. Enable ,

Ready , CLK)

Ⅰ. Introduction

3-1. Main PBA – 6(ML-2240&2245)

Fuser Control

¾ ML-2240 has one heat lamp.
¾ Main controller has a signal to control the lamp.

Ⅰ. Introduction

3-1. Main PBA – 7(ML-2240&2245)

USB 1.1

(Compatible with USB2.0)

¾ ML-2240 uses internal USB1.1 in Jupiter4e.
¾ USB2.0 full speed supported.

Ⅰ. Introduction

3-1. Main PBA – 8(Only ML-2245)

Toner Waste-Sensor

¾ ML-2245 uses Waste sensor PBA to sense remaing Toner.
¾ Developer Unit of ML-2245 is separated into Toner cartridge and

Imaging Unit.
(Developer Unit of ML-2245 & ML-1640 is not separated.)

¾ So remaining toner of Toner cartridge must be sensed.

Ⅰ. Introduction

3-2. Main PBA – 1(ML-1640)

Main Clock and SSCG

¾ SSCG means Spread Spectrum Clock Generator
¾ Apply SSCG(Spread Spectrum Clock Generator) on the Main Clock.
¾ Main Clock frequency is 12MHz and Video Clock is 20.75MHz.
¾ CPU makes video clock using internal PLL block.
¾ It doesn’t need extra Oscillator for video clock.
¾ The SSCG of the main clock has +/-0.6% spread spectrum in order

to reduce EMI.

¾ The SSCG of the video clock part has no spread because of image

quality, but still effective for reducing EMI.

Ⅰ. Introduction

3-2. Main PBA – 2(ML-1640)

CPU – Jupiter4e

¾ Jupiter4e is developed using ARM940T 32Bit RISC embedded processor core.
¾ 1.8V internal, 3.3V external(I/O boundary) Voltage used.
¾ Image processor included(GDI only).
¾ On-Chip clock genarator with internal PLL.
¾ Operating frequency is 75MHz ( converting 10MHz main clock to 75MHz operating

clock using internal PLL )

¾ It has Built in Flash Memory : 4MBits (128Kx32bits)
¾ 4Mbit is 0.5MByte. It is small capacity. So we can not store many function in it.

Ⅰ. Introduction

3-2. Main PBA – 3(ML-1640)

SDRAM – 8MB * 1ea

¾ SDRAM(Max operating frequency : 133MHz) used and SDRAM has

8MByte memory capacity.

¾ SDRAM operates 75MHz which is the same as CPU’s operating

frequency.

¾ F/W program code had been stored in the Built-in Flash Memory

when Main PBA assembled , and the program code can be
upgraded by user.

¾ When upgrading F/W, never turn off the power until completing

upgrade process.

¾ If user turn off the power while upgrading F/W, the program code

will be conflicted and the machine will not work.

¾ If above situation occurs, replace the Main PBA.
¾ After downloading, set automatically conduct power off/on.

Ⅰ. Introduction

3-2. Main PBA – 4(ML-1640)

EEPROM

Chip Select InputCS

Serial ClockSK

Serial Data OutputDO

Serial Data InputDI

Organization SelectORG

Supply VoltageVCC

GroundGND

¾ ML-1640 has EEPROM in order to store environmental data, total

page count data, dot counter data, etc…

¾ M93C66(4Kbit) EEPROM device is used.
¾ Read/Write operation is activated when the machine states go idle.
¾ While printing, Copying, scanning, EEPROM read/write operation

not activated.

¾ Because of above reason, if user turn the power off right after

printed page exit, there is no time for writing newer data that
results dot count and page count data not updated.

Ⅰ. Introduction

3-2. Main PBA – 5(ML-1640)

Main Motor Control

(A3983)

¾ ML-1640 drives the engine motor using Stepping motor unlike

ML-2240.

¾ A3983 is a stepping motor driver IC.
¾ A3983 has the ability control the output current which gives the

smoothing action to the motor in the starting period.

¾ But main motor can be driven forward only full-step resolution in

ML-1640.

Ⅰ. Introduction

3-2. Main PBA – 6(ML-1640)

Fuser Control

¾ ML-2240 has one heat lamp.
¾ Main controller has a signal to control the lamp.

Ⅰ. Introduction

3-2. Main PBA – 7(ML-1640)

USB 1.1

(Compatible with USB2.0)

¾ ML-1640 uses internal USB1.1 in Jupiter4e.
¾ USB2.0 full speed supported.

II. Summary of Product

3-3. SMPS PBA

ML-2240/2245

Heat Lamp

Connector

AC Input

Socket

Rear Cover Open

S/W

Main <-> SMPS

Connector

Paper Feed Sensor

¾ The output current of 5V and 24V is

- 5V : 0.7A

- 24V : 1.5A (in ML-1640)

2.0A (in ML-2240,2245)

¾ On the SMPS board, Paper feed sensor

exists.

¾ The capacity of one heat lamp is

600W in ML-1640 &
750W in ML-2240,2245.

ML-1640

II. Summary of Product

3-4. HVPS PBA

LEDs & tact switch

-100VOPC

-1300VMHV

-550VSUP

-350VDEV

Main <-> HVPS

Connector

Front Cover Open

S/W

¾ HVPS board supply high voltage for developing Process.
¾ High Voltage controlled by PWM signal from CPU.
¾ LEDs & tact switch exists on HVPS instead of OPE PBA.

THV

+1,300V

-1,000V

II. Summary of Product

4. Cover Open Sensing

Two cover open switches are near front cover & rear cover.
If two switches open, 24VS2 for DC fan, main motor, polygon
motor part of LSU and high voltage of HVPS and 5VS for LSU are
cut off.
And Online/Error LED emits Red light.
Cut off mechanism is like below.

HVPS

5V

5VS

Digital Switch

Main PBA

24VS2

24VS1

Near front cover

24VS2

Near rear cover

24VS1

5V

Cover Open

Switch

24VS1

Cover Open

Switch

24V

SMPS

II. Summary of Product

5-1. UI

Embody UI using RED LED & 3 color LED.

3 color LED

RED LED

Cancel KEY

II. Summary of Product

5-2. UI – State Diplay

ML-1640 & ML-2240 UI is same.

ML-2245 UI is diferrent from ML-1640
& ML-2240 UI.

Because Developer Unit of ML-2245 is
separated into Toner cartridge &
Imaging Unit.

Thank you

The END