Brother HL-4000CN Service Manual page 9

11. IMAGE QUALITY FIP .................................................................................. V-74
11.1 Notes on Image Quality Trouble Check ........................................................................... V-74
11.2 Basic Rule of Image Quality Adjustment.......................................................................... V-74
11.3 Troubleshooting Table by Trouble Phenomena............................................................... V-75
CHAPTER VI DIAGRAMS.............................................................. VI-1
1.PREFACE ....................................................................................................... VI-1
1.1 How to Use the BSD ........................................................................................................... VI-1
1.2 Explanations of Symbols..................................................................................................... VI-1
1.3 Signal Name ....................................................................................................................... VI-4
1.4 DC Voltage.......................................................................................................................... VI-4
1.5 Input/Output Test ................................................................................................................ VI-4
2. BSD (BLOCK SCHEMATIC DIAGRAM)

CHAPTER VII PLUG/JACK (P/J) CONNECTOR LOCATIONS .... VII-1
1. LIST OF P/J................................................................................................... VII-1
1.1 Base Engine....................................................................................................................... VII-1
1.2 2 Tray Module .................................................................................................................... VII-3
2. P/J LAYOUT DIAGRAM ................................................................................ VII-4
2.1 IOT Top.............................................................................................................................. VII-4
2.2 IOT Front/RH ..................................................................................................................... VII-5
2.3 MCU and HVPS PWB/ESS PWB....................................................................................... VII-6
2.4 Tray 1................................................................................................................................. VII-7
2.5 2 Tray Module .................................................................................................................... VII-8