Sony UP-895 Service Manual page 4

4-4. System Control Section ............................................................................... 4-8
4-5. Thermal Head Section ............................................................................... 4-14
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
2
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
4-5-1. 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
UP-895/(E)