This is where the term exclusive becomes paramount. Topcon restricts full calibration routines to authorized service centers. The genuine manual includes:
| 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
: It contains exploded views and part lists for replacing delicate components like the internal printer, joystick assembly, or the scenic fixation target. Advanced Troubleshooting This is where the term exclusive becomes paramount