Fujitsu ULTIMA90 Maintenance Manual page 168

This resistance suppresses surge current at power-on.
During printer operation
Because the power thermistor heats by itself by input current during printer operation, resistance is lowered down
to about one-tenth of its initial value to reduce loss.
When power is turned on again
If the power is turned on again immediately after it is turned off, the power thermistor is still warm and
may have less suppression effects, and surge current exceeding the specified level may flow.
5.3.10. Fuse
Basically, PCB should be replaced. But just in case of replacing fuse, choose the following fuse.
1.FU1
1-1.Ampere Rating： 1A
1-2.Voltage ： 125V
1-3.Model name ： 0451001.MRL-LITTELFUSE
1- 4.Fusing feature ： Super fast-blow type
2.FU3,FU4
1.Ampere Rating ： 5A
2-
2-2.Voltage ： 125V
2-3.Model name ： 0451005.MRL-LITTELFUSE
2- 4.Fusing feature ： Super fast-blow type
3.FU2
3- 1.Ampere Rating ： 5A
： 125V
3-2.Voltage
3.Fusing feature ： Super fast-blow type
3-
4.FU5,FU6,FU7,FU8
1.Ampere Rating ： 3.5A
4-
4- 2.Voltage ： 125V
4-3. Fusing feature ： Super fast-blow type
5.FU10,FU12,FU13
5- 1.Ampere Rating ： 2A
5- 2.Voltage ： 125V
5-3. Fusing feature ： Super fast-blow type
168