Error code 239 EF

Issue

During the use of the 7701M device in the CADR program, an error Error code 239 EF occurs.

Solution

The cause of the error is the sticking of the magneto-optical head. This is due to the fact that on a new device, the silicone "sweats" and can delay the magneto-optical head when it rises.

The following factors may contribute to the problem:

• High temperature
• Increased humidity
• Wet ink from banknotes

Usually, the sticking effect weakens on its own after a certain period of device operation, as the silicone surface wears out and becomes covered with a thin layer of dust.

For urgent troubleshooting, it is recommended to:

1. Carefully clean the silicone surface from dirt
2. Wipe the magneto-optical head to remove ink traces and other foreign substances