Damaged solenoid driver transistors

When the embossing head cable is connected the wrong way it will damage the driving transistors, typically solenoid number 3. 

Picture of correct embossing head cable on Everest-D.

Test the solenoids by the hammer test HELP+ON. It print a pattern with all 13 solenoids with corresponding number. See below picture


If the embossing head cable is placed wrong way below strange hammer test (HELP+ON) will printed and the transistor and resistor for solenoid 3 will be damaged.


Find instructions of how to replace transistors and resistors in below link. 
www.indexbraille.com/en-us/support/downloads/service/v5/replace-solenoid-drivers-v4-v5