JRC Alpatron AlphaMidiCourse, Installation And Operation Manual

Page: 65 / 82

4.6.6 Fuse Replacement
To replace a fuse when it has blown:
Figure 39: Fuses Control Unit
1. Turn OFF the power switch on the operating panel.
2. Disconnect the power supply from the ship’s distribution board and the emergency power supply of this system.
3. Investigate the cause of the fuse blowing.
Note It will blow again, unless the cause is removed when replaced with the same capacity fuse and it
recovered for a while. Note that there is some characteristic dispersion for the same capacity fuse.
Note Confirm that the voltage at the following external terminal board is zero. To confirm this, perform action
as in Power Supply Failure (alarm code 1) on page 60.
Fuse No. Capacity TB-No. Signal Description
F1 TB1-33 1R24+ Power supply for ch. 1 serial repeater
F2 TB1-38 2R24+ Power supply for ch. 2 serial repeater
F3 TB1-43 3R24+ Power supply for ch. 3 serial repeater
F4 TB1-48 4R24+ Power supply for ch. 4 serial repeater
F5
1A
TB1-21 ST15 Power supply for ch. 1 step motor repeater
F6 10A TB3-1 24M+
Main power supply (standard type)
Master compass power supply (with Power supply unit)
F7 3.15A TB3-3 24B+ Power supply for ICIF and IOPT board (with Power
supply unit)
F8 6.3A TB2-1 24R+ Power supply for repeaters (with Power supply unit)
F9 10A TB3-5 24BT+ Emergency power supply (standard type)
Table 19: Fuse Replacement
Note All fuses are
∅5.2x20mm,
except Master Compass fuse.
65 | Maintenance