Hi guys

Recently I worked on a 2002 EFG-DF 13-20 that due to a K1´s coil short circuit to chassis provoke that circuit protection for MP1514 drive controls 1U1 and 1U1.1 blew up. This happened because the operator began to replace 1F9 fuse each time it was blown for protection causing the circuit protection (diode and smd capacitors to short circuit ).

Luckely I could repaired protection circuit for these two boards and installed them again, but before that i checked all electrical wires and canbus connections, everything was fine. Also checked cables status with battery connected but unplugged from every board excepting Interface 3, also the customer uninstalled left drive motor for maintenance.

After installing the repaired boards and replaced the malfunction K1 I connect the battery and turnned on the forklift:
1. Lift board and RH Drive board startted with leds red and green flashing.
2. LH board only with red led flashing.
3. Int 3 with steady green
Lisa shows errors: 14 (K1 off), 40 (Drive motor temp sensor) and messages related to brushes sensor offline
As LH drive motor was offline this was according to the problem, but after installing again LH Drive motor with all the cables them:
1. Lift Board and LH drive Board startted with leds red and green flashing.
2. RH Drive board only with red flashing.
In this ocassion the problem with brusshes was changed to the RH drive board together with error 14 (k1 off).
3. Int 3 with steady green

As LH Drive board is the one in charge of turning on K1 I set parameters to default and restart the forklift without any result.

After checking all the cables I try to change truck type from default one to see if the boars were dummy, default truck type was EFG and I put EFG DF ac and set parameters to default, after rstarting the equipment:
1. 3 Boards goes on with red/green light steady.
2. LH Drive board turned on K1
3. 3M1 steering motor turned on
after few seconds of some smoke arrise from Lifting board and K1 turned off.

I turned off the forklift and check everything for damage, nothing at sight. I re-started the forklift and change Truck type to EFG and at this time:
1. Error 39 at Lift board, Error 83 at LH Drive board and Error 1

I checked Battery voltage even at startup and it was at 48 volts. I also changed truck type again to EFG (only) and at startup the forklifts starts as EFG-v 2.5 not just as EFG and all errors remain.

Finally I tooked Lift board to check for any circuit damage but right now i´m getting without ideas and resources.

Any help there

Many thanks