Section 4 -- Maintenance 4-3
© 2008, Satake USA Inc.
(ALL RIGHTS RESERVED)
D. Disconnect the electrical cables from the lamps, including the light level
sensor cable on the lower lamp.
E. Remove the wing nut and vertical stiffener at the center of the viewer.
F. Turn the quarter turn fasteners 1/4 turn counterclockwise, and pull the lamp
and holder straight out from the lamp enclosure.
G. Replace the old lamp with a new lamp, being careful to install the lamp pins
into the connector properly. Any printing on the lamp should be positioned
toward the viewer door, and away from the background and product view
point. This will ensure that the printing does not block any light from
getting to the background or the product.
H. Replace the lamp and holder into the lamp enclosure and turn the fasteners
1/4 turn clockwise.
Make certain that the lamp holder with the light level sensor is installed in
the lower position.
Make certain that the flange on the top lamp holder faces up, and the flange
on the bottom lamp holder faces down.
I. Install the vertical stiffener and wing nut.
J. Connect the electrical cables.
K. Close the viewer doors and return the machine to operation.
L. Check to see that the new lamps are illuminated.
M. See Section 4.6, ADJUSTING THE LAMP BALLASTS.
4.6 ADJUSTING THE LAMP BALLASTS
The ScanMasterII uses two fluorescent lamp ballasts (See Figure 2-1). The ballast
nearest the front of the machine operates the front lamps. The ballast nearest the
rear of the machine operates the rear lamps.
The top front lamp and the bottom front lamp are connected in series. The same
current passes through both lamps. If one lamp does not operate, the other lamp
will not operate either. The one exception is the Dual Sort Mode. When the sorter is
set up to simultaneously sort based on color on the rear view and translucence on
the front view, the upper front lamp will be turned off and the lower front lamp will
remain on.
The top rear lamp and the bottom rear lamp are also connected in series.
A light level sensor (photoresistor) is located near the center of each lower lamp,
and monitors the light output from its respective lamp (See Figure 1-4 and 1-5).
This light level sensor is connected to its respective ballast. The ballast controls the
lamp current to provide constant light output, even with variables such as lamp
phosphor deterioration, temperature changes, and line voltage fluctuation.
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