Sony UP-895 Service Manual

To reduce the risk of electric shock, fire or injury, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. ! WARNUNG Die Anleitung ist nur für qualifiziertes Fachpersonal bestimmt. Alle Wartungsarbeiten dürfen nur von qualifiziertem Fachpersonal ausgeführt werden. Um die Gefahr eines elektrischen Schlages, Feuergefahr und Verletzungen zu vermeiden, sind bei Wartungsarbeiten strikt die Angaben in der Anleitung zu befolgen. Andere als die angegeben Wartungsarbeiten dürfen nur von Personen ausgeführt werden, die eine spezielle Befähigung dazu besitzen. ! AVERTISSEMENT Ce manual est destiné uniquement aux personnes compétentes en charge de l’entretien. Afin de réduire les risques de décharge électrique, d’incendie ou de blessure n’effectuer que les réparations indiquées dans le mode d’emploi à moins d’être qualifié pour en effectuer d’autres. Pour toute réparation faire appel à une personne compétente uniquement.

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

4-4-1. Reading of Keys .........................................................................4-8 4-4-2. Reading of Function Switches ...................................................4-8 4-4-3. Platen Motor Control..................................................................4-9 4-4-4. Head Up and Down Control..................................................... 4-10 4-4-5. Monitor of Door Sensor ........................................................... 4-10 4-4-6. Monitor of Paper Sensor .......................................................... 4-10 4-4-7. Monitor of Head Temperature Sensor......................................4-11 4-4-8. Control of Head Fan Motor (for Head Cooling) ...................... 4-11 4-4-9. Control of Video Circuit Section ............................................. 4-11 4-4-10. Control of Memory and Head Control Circuit .........................4-12 4-4-11. Gamma Correction and Thermal Storage Correction ..............4-13 4-4-12. Discrimination of Video Signal to be Input ............................. 4-13 4-4-13. Remote Interface ...................................................................... 4-13 4-4-14. Storage of Print Count History.................................................4-13 4-5. Thermal Head Section ...............................................................................4-14 4-5-1. Structure ................................................................................... 4-14 4-5-2. Basic Operation ........................................................................4-15 4-5-3. Stair Generation ....................................................................... 4-15 4-5-4. Temperature Correction ........................................................... 4-16 4-5-5. Line Count Correction..............................................................4-16 5. Troubleshooting 5-1. Print is Faulty ..............................................................................................5-1 5-2. Print is Too Dark or Too Light ...................................................................5-2 5-3. “Paper Sensor” is Out of Order ...................................................................5-3 5-4. Head Operation (Up & Down) is Out of Order...........................................5-4 5-5. Paper Feeding is Out of Order ....................................................................5-5 5-6. Door (Opening and Closing) is Out of Order..............................................5-6 6. Service Mode (Self-diagnostic Function) 6-1 Printing the Test Pattern ..............................................................................6-1 6-2. Up/Down Operation of Head ......................................................................6-2 6-3. Feed Operation ............................................................................................6-2 6-4. Display and Clearing of Print Sheet History ...............................................6-3 7. Semiconductor Pin Assignments

8-2. Exploded Views ..........................................................................................8-2 8-3. Electrical Parts List .....................................................................................8-7 9. Block Diagram Overall ....................................................................................................................9-1 10. Schematic Diagrams and Board Layouts FRAME ................................................................................................................10-2 KY-454 .................................................................................................................10-2 SE-531 ..................................................................................................................10-2 SE-532 ..................................................................................................................10-2 SU-52 ...................................................................................................................10-2 MA-99 ..................................................................................................................10-4