Hi John,

* As a note, if any of the three micro switches in the emergency stop button fault these machines can throw up all sorts of miscellaneous codes, so i'd suggest checking this first.

FE77, 24V error at the LAS module
There is no 24V signal at pin X10.35 when the vehicle is switched on. Both safety relays K1 and K2 are switched off by the ÜWA-CPU. No vehicle functions other than the steering can be used.
Check the wiring and if it is OK, replace the LAS module (see "LAS module, Safety monitoring, Block diagram").

FE80, Excess voltage/undervoltage at the steering.
The supply voltage of the steering is faulty. Check the power supply at X47 (see "Steering, Steering unit, Connections"). If this is OK, replace the steering unit.
Remark: The supply voltage is checked by the main steering contactor 3K1. This error code is also issued if the contactor is faulty.
The brake closes, travel is blocked.

FE42, CAN bus 2 communication error between FPS and travel
converter.
The FPS is not receiving any data from the travel converter. The main contactor K1 is opened.
Check that the CAN bus 2 wiring and bus terminal are correct (see "CAN bus, Bus structure CAN 2").
If the CAN bus is OK, the converter must be replaced. To test whether the converter is the problem in faulty bus communication, the component can be contacted directly via the onboard diagnosis of the display (Software version query, see "Display, Onboard diagnosis, Software version query"). If Version 0.00 appears on the display when the query is made (see "Display, Onboard diagnosis, Error codes") the component is faulty.
Remark: (Converter to 04/2005). This error message is also issued if the 48V supply voltage is missing at X1.1 of the converter (see "Converter, Status LED"). This is, for example, the case when the emergency-stop button has been actuated.
This error can also be caused by an incorrect converter encoding (cf. "Converter, converter encoding").
Remark: (Converter from 05/2005) If the 24 V supply voltage is missing at X1.15 of the converter, this error message also appears. Also if the connection FPS X1.12 -- travel converter X1.11 is interrupted when switching on the truck (cf. "Converter, supply and enabling (from 05/2005)")

Good luck.

Dez