Surge Current Controller; Fuse - Fujitsu DL7600 Maintenance Manual

5.3.9. Surge Current Controller

Surge current caused at power-on is controlled by the power thermistor (NTC thermistor) on the power supply board.
This section explains the surge current controller.
At power-on
The power thermistor is directly connected to the power supply input line and normally has several ohms of
resistance when power is turned on.
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
2-1.Ampere Rating ：5A
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
3-2.Voltage
：125V
3-3.Fusing feature ：Super fast-blow type
4.FU5,FU6,FU7,FU8
4-1.Ampere Rating ：3.5A
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
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