Star Micronics WinType 4000 Technical Manual page 139

Step
7 (Check the thermal fuse.)
Has the thermal fuse melted?
*4: If the procedure in section 2.3 U4 is followed and no other problems are detected, follow the procedure below:
If the thermal fuse melts again, replace the LVPS assembly and MCU PWB parts.
If the problem does not recur, the problem could have been caused by a malfunction in the fuser assembly before
it was changed or by a malfunction in the thermostat.
Check
– 135 –
TROUBLESHOOTING
Remedy
YES
In order to determine
the reason for the
thermal fuse melting,
follow the procedure
in section 2.3 U4 after
replacing the fuser
assembly. *4
NO
Replace the fuser
assembly.