• Document: ML-2240 & ML-2245 & ML-1640 Series training February 2008 Agenda 1. Overview 2. Block & Connection Diagram 3. Schematic Key concept 4. Cover Open Sensing 5. Q&A 1-1. Overvi...
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ML-2240 & ML-2245 & ML-1640 Series training February 2008 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 Main Board Waste Sensor (Only ML-2245) HVPS Ⅰ. Introduction 1-2. Overview(ML–1640) SMPS Main Board HVPS 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 CS Chip Select Input SK Serial Clock ¾ ML-2240 has EEPROM in order to store environmental data, total page count data, dot counter data, etc… DO Serial Data Output ¾ M93C66(4Kbit) EEPROM device is used. DI Serial Data Input ¾ Read/Write operation is activated when the machine states go idle. ¾ While printing, Copying, scanning, EEPROM read/write operation ORG Organization Select not activated. VCC Supply Voltage 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 GND Ground 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. Introducti

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