B&K Precision 1693-1694 - Manual - Manual (Page 18)

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6 Maintenance
6.1 When the Unit is Not Turning On
Check if the power ON/OFF switch is turned ON. If not, then check the power cord.
Please make sure that the power cord is properly connected to the unit. Please also
check the main switch and ensure that the AC supply at your site is the same as the
one mentioned at the rear chassis of the unit. Check for a blown fuse.
6.2 Fuse Replacement
If the fuse blows, the LED will not light and the instrument will not operate. Replace
only with the correct value fuse. Refer to table below for fuse value and type. There
are two identical fuses located internally on a PCB near the power input receptacle.
Line Voltage Fuse Type
100 – 240 VAC 20 A/250 V 3AB ceramic tube fast blow
Table 2 - Fuse Table
CAUTION: Never remove the metal cover of the power supply while AC power is
connected.
Replace fuses as follows:
1. Unplug the power cord from the rear of the instrument.
2. Use a screwdriver to remove case cover of power supply.
3. Locate PCB near the power input receptacle where the fuses are clipped in
(designated as F1 and F2) and replace blown fuses.