: The printer paper roll is empty; a common fix is simply dropping a new roll into the holder. Acme Revival Maintenance & Environmental Requirements
| Error Code | Meaning (Standard) | Meaning (Exclusive Manual) | Fix | | :--- | :--- | :--- | :--- | | EE-4 | Printer error | Thermal head resistance out of spec (170–190 ohms) | Replace print head or adjust resistor R12 on power board. | | EE-7 | Communication error | Serial buffer overflow due to baud mismatch | Check opto-isolator IC5 on I/O board. | | EE-23 | Alignment error | CCD line scan defective row 512 | Run pixel mask routine in Service Mode; replace sensor if >10 dead pixels. | topcon kr8900 service manual exclusive
The device is designed for high-speed, accurate clinical measurements. : Sphere : -25D to +22D Cylinder : 0D to ±10D Axis : 0° to 180° Corneal Curvature : 5.00mm to 10.00mm radius Minimum Pupil Diameter : 2.0mm : The printer paper roll is empty; a