From the service manual...
System Error: 08:YZ
Problem Description: Problem with the Front Panel.
Corrective Action: Try the following:
- Switch the Power OFF from the back of the Printer and disconnect the Power cord. Reconnect the power cord and power On the Printer.
- Check that the Front Panel interface cable is not damaged and is correctly connected between the Main PCA and the Front Panel.
- Check that the memory module in the Formatter is installed correctly.
- Check that the connections between the Formatter, the Formatter and the Formatter are not damaged and are correctly connected.
- Check that the Printer has the latest Firmware version. If not, update the Firmware to the latest version.
- If the System Error continues, replace the Main PCA ⇒ Page 8-144.
- If the System Error continues, replace the Formatter ⇒ Page 8-140.
- If the System Error continues, replace the Front Panel ⇒ Page 8-40.
for the YZ (01) it says:
Reseat/Reconnect/Clean/Adjust (manually)