Troubleshooting
114 Operating Instructions 513/533 - 01.0 - 09/2023
M-301 Memory 
abnormal
Control panel memory data 
abnormal.
• Internal error: The user needs 
to update the software of the 
control panel.
M-302 Machine type 
parameter error
The machine type data read by 
the control panel is outside of 
the set range.
• Press the RESET button 
to call up parameter 241 
automatically and select and 
save the corrected machine 
type.
M-303 UK parameter 
abnormal
Abnormal range of the 
parameter that was read from 
the EEPROM by the control 
panel.
• Press the RESET button to 
call up the system menu and 
restore the default setting.
M-304 Main PCB 
parameter 
abnormal
Abnormal range of parameters 
received from the control by the 
control panel.
• Press the RESET button to 
call up the system menu and 
restore the default setting.
M-305 Normal seam 
pattern 
parameter 
abnormal
During the use of seam pattern 
parameters, the control panel 
detects an abnormal parameter 
range.
• Press the RESET button to 
call up the system menu and 
restore the default setting.
M-306 Error
Seam pattern 
number
The selected seam pattern is 
not stored in ROM or has been 
disabled. The seam pattern is 
"0"
• Press the RESET button to 
confirm the seam pattern 
number.
M-307 Seam pattern 
data abnormal
While the sewing data of the 
seam pattern is read by the 
control panel, the system 
detects an abnormal data 
format.
• Select different seam 
patterns.
M-308 Sewing data too 
great
The volume of the seam pattern 
data is found to be too great 
during the calculation.
• Select different seam patterns 
for sewing.
Error Description Possible cause Troubleshooting