Johnson Systems JS-ICON 624 ARCH Dimmer Rack - Manual (Page 13)

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Phase Reference Printed Circuit Board
3-Phase/1-Phase Select Switch (SW1)
This switch enables selection of 3-Phase or 1-Phase operation of the JS-
ICON ™ . If this switch is not in the correct position, dimmers 3 and 4 will not
dim correctly and appear as though they are non-dim. Refer to 3-Phase to
1-Phase conversion directions on page 6 for more details.
DC Power Supply Fuse (F1)
This fuse protects the on-board switch mode DC power supply from over-
current. If the “POWER” LED is not illuminating, and AC power is present on
phase A, check the fuse by removing the fuse holder cap and inspecting, or
measure continuity. If the fuse needs to be replaced, only use a fuse rated
the same as the original GDC 250mA 250V fuse.