SM74 8 PH Entered Variant code for perfector not plausible

[Linus]

Hi all
After power down, the machine started and showed error on unit 2. the machine cannot run.
Entered Variant code for perfector not plausible on unit 2. This machine has perfector only after unit 4.
Variant codes are all same except it doesnt show pages 141-150 while it showed previously when the error hadn't appeared.
Please suggest.

 

[boooch]

Hi! What year was the car built? Who changed the variant key?