HP 9825a

[Craig Bladow]

Troubleshooting the "End of Tape" Error so far:
1. Positioned single hole in tape near the drive wheel. No change. Note that I have not yet heard the motor do anything.
2. Inspected both tapes I've tried for missing coating, which might lead to "End of Tape", both look like they have their coating intact. (Except where the drive band has sat for the last 27 years, but I've manually rolled past that section.
3. Slid an opaque piece of paper behind the cartridge to block the hole sensor light. Still get "End of Tape".
5. Tried to rewind with no cartridge present, received a "Cartridge Out" error, so cartridge sensing appears to be working.
4. Perused HP's 9815a patent and Tony Duell's schematics. Next step will be to trace the Hole sensor signal to see if there is a component or circuit fault.