Manual

M390S Manual Maintenance  23
Refer to the Appendix for an exploded view of the cavity assembly.
5.5 Fuse Locations
The M390 has several fuses. Refer to the table below. See the appendix for photo-view of fuse
locations.
Fuse N
µm
ber
Amps/volts
Location
Description
F1 & F4 3.15A / 250 VAC External Rear Panel Fans
F2 & F5 1A / 250 VAC External Rear Panel Temp. Controller
F3 & F6 2A / 250 VAC External Rear Panel SCR Control
F7 125A / 250 VAC
In SCR on floor of
blackbody
SCR Main Fuse
Electrodes
Quartz tube with graphite
foil and felt around cavity
Slide this electrode out to
repair/replace cavity.
Electrode tension
adjustment
M668 Optics
Front
Rear