870: Internal Power Supply fault.
All capacitors changed.
Repair PCB after heating.
Pre driver PCB: 1k for soft start and 1k x4 for HCPL7800.
HCPL7800  -3,
Repair the power board: 
changed SS-resistors 22R (10R+10R)
7&8 pins for start. Numeration from right side.
Tested.
1081: Replacement Pre driver board after repair.
FAN 24V.
Tested.
1481: installed the DC BUS outputs and terminal.
1484: because fault voltage of PS unit out of work PRE-DRV
Total.
1624: no problem. Test, -ok. SW I-V was in V instead I (4-20mA)