Sony UP-895, Service Manual

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UP-895/(E)
Table of Contents
1. Operating Instructions
2. Service Information
2-1. Board Layout ............................................................................................... 2-1
2-2. Disassembly ................................................................................................ 2-1
2-3. Removal of Major Parts .............................................................................. 2-2
2-3-1. Removal of Mechanical Block ................................................... 2-2
2-3-2. Removal of MA-99 Board ......................................................... 2-3
2-3-3. Removal of Switching Regulator ............................................... 2-3
2-3-4. Removal of Thermal Head ......................................................... 2-4
2-4. Tightening the Screws ................................................................................. 2-5
2-5. Installation of Fan Motor ............................................................................ 2-6
3. Electrical Alignment
3-1. AGC Adjustment ......................................................................................... 3-1
3-2. Video Level Adjustment ............................................................................. 3-1
3-3. Brightness and Contrast Adjustment ........................................................... 3-2
3-4. Head Voltage Adjustment ........................................................................... 3-3
3-5. Initialization of Print Count History ........................................................... 3-3
4. Circuit Operation Description
4-1. Video Circuit ............................................................................................... 4-3
4-1-1. BNC Input Connector - Trap Filter Circuit ................................ 4-3
4-1-2. nC-SYNC Generator Circuit ...................................................... 4-3
4-1-3. AGC Circuit ............................................................................... 4-3
4-1-4. Brightness and Contrast Control ................................................ 4-3
4-1-5. A/D Conversion and D/A Conversion ....................................... 4-3
4-2. Clock Generator Circuit .............................................................................. 4-4
4-3. Memory and Head Control Circuit ............................................................. 4-4
4-3-1. Reading the Serial Data from System Control ........................... 4-5
4-3-2. Writing in Frame Memory ......................................................... 4-5
4-3-3. Transfer from Frame Memory to Line Memory ........................ 4-5
4-3-4. Thermal Head Control and One-Line Memory .......................... 4-5