Fafnir errors in SK700 Gilbarco Weeder-Root repair without service terminal

If FAFNIR module in SK700 has fixed critical amount of errors of GRF, the further work will be impossible. There is way to correct this problem. It's necessary to connect the signal wire SA and SB from module FAFNIR on GND.

Variant 1:
In Head on block FAFNIR we disconnect the white wire and connect to nearby brown together (white - SA, brown - GND). Also we do with gray and orange (gray - SB, orange - GND).
Variant 2:
On Board GRF-Interface (it's under table near by IS-Interface) we connect contacts 1 and 2 (SA and GND), and contacts 5 and 6 (SB and GND) with short wire. White and gray wire to disconnect and cut.