Error 91 in Heidelberg 102 CD S+Lx 1999 machine

I am installing one Heidelberg 102Cd 1999 machine getting error 91 description is as shown in the attached picture.
Please help

 

Hi sir:
Possibles fault

One EAK is missing in the plug-in unit

There is one EAK too many in the plug-in unit.

2. Fault of the differential inputs.
Wrong output on input/ output IC.

Upper loop test terminated with fault (it is possible that the
plug-in contacts X1E, X1A, X2E, X2A on the EAR got mixed
up).

Lower loop test terminated with fault (it is possible that the
plug-in contacts X3E, X3A, X4E, X4A on the EAR got mixed
up).

3. Initial state of input/output IC incorrect after reset.
Fault when writing, reading test pattern on input/output IC.
Filter times for inputs incorrect.
Incorrect interrupt generation via inputs.

4. Faulty output latch of internal control.
Fault when reading, writing to internal register.
Defective timer flip-flop.
Timer defective.

Blessing

 

Dear sir

Thanks for your help. My problem was solved. I found the error into one of the fans unit underneath the printing unit of the machine was faulty. Due to the it was giving error 91

 

You're welcome sir

Blessing