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5 Troubleshooting hints
5.1 Error – possible solution
The machine does not start and the control lamp on the operation
device MT800 is off – replace 10 A melting fuse; if the new fuse melts, too
or the machine does not start: replace control board KK66.
The devices will not be enabled – the motor functions but the devices like
thread cutter, foot lifting or needle cooling will not be enabled – replace 3 A
melting fuses, then cut off all devices electrically from the motor control;
switch on the machine and connect all devices one after another; after every
connection, switch on the machine and check melting fuses; in this way, the
defective device can be detected (possibly magnetic valve); if the electrical
elements of the devices are ok and the replacement of the fuses brought no
success: replace I/O-module, replace control board KK66.
The operation device MT800 is switched on, but the display is not clear
or without function – switch machine off and on; pull out the connecting
cable of the operation device MT800, check and remount it; possibly do the
same with the connecting cable between control board KK66 and I/O-module;
replace operation device MT800, replace I/O-module, replace control board
KK66.
5.2 Error messages in the display – possible solution
Fault in the control board (KG) – replace control board KK66.
External fault (KE) – switch machine off and on; check power supply; check
environment for disturbing devices (spark-generating devices, high-frequency
machines, a.s.o.).
Program defective (KP) – delete defective program and program it again; if
several programs are defective, all programs should be loaded from the
storage module; if the loaded programs are defective: replace control board
KK66.
Position actor defective (SG) – check the connecting cable of the position
actor; check the connecting cable between I/O-module and control board
KK66; replace position actor, replace I/O-module, replace control board
KK66.
Driving belt loosened (CA) – make correct belt tension; check, whether the
motor is fixed properly on the base frame.
Motor overloaded (MS) – there can be many reasons: e.g. missing oil in the
sewing head, oil too cold, possibly sewing thread wrapped around the belt
disc, ...
Motor blocked (MB) – possible causes: machine blocked, needle blocked,
