870: Internal Power Supply fault.
All capacitors changed.
Repair PCB after heating.
Pre driver PCB: HCPL7800.
HCPL7800  -3.
After the previous repair (MAL's repair) PIN drane - one of the 3
was free, - without screw. 
7&8 pins for start. 3&4 CURRENT INPUT 4-20mA.
Numeration from right side.
Tested.