Aristo VCL4500 Series User manual

Aristo Archive Information
Aristo VCL4500 Series
Dual Lamp Cold Light Head
General Information
◊ Complete variable contrast control
from grade 0 to grade 5 with 50 settings
over entire range without using lters
◊ Low power consumption
◊ Fast consistent exposures
◊ Maybe used with most any timer
Light Head
(2 lamps High Intensity)
◊ Size: 7 11/16” L x 7 11/16” W x 4 5/16” H
◊ Weight: 3.3 lbs.
◊ Secondary Cable: 6’
◊ Heater: adjustable thermostat controller
◊ Power supply: 120 VAC, 60 Hz, 195 Watts
◊ Fuse: AGC 3 amp
◊ Size: 8” L x 8” W x 3.75” H
◊ Weight: 10.2 lbs.
◊ Primary cord: 6’ long, 3-prong grounded
◊ Relay: Built-in with 6’ 2-line cord for timer connection
1. LED intensity control
2. Red LED Display 0.0 up to 5.o in tenths.
3. Variable contrast control from grade
0 through grade 5 with 50 settings. Maybe
used to adjust speed on graded paper
4. Color selection 3 way rocker switch
5. Main power on/off lighted rocker switch
with red lens
6. Normal/split printing mode switch
7. Zero adjustment for different variable
contrast papers
VCL4500-C-Dual-Dim-110V Model Shown
2 pc set with separate power pack.
Blue lamp is dimmable on standard models.
Blue and green lamps are dimmable on Dual models

Aristo Archive Information
Installation:
1. Your diffusion light source is equipped with two (2) high
intensity lamps. They are designed to give you peak
spectral distribution in blue and green for optimum control.
◊ Installation of your VCL4500 is fast and easy and only
requires removing the existing lamp housing and
condenser lenses.
◊ On Beseler 4x5 units, just place the Aristo light head
into the upper bellows which should be left totally
collapsed. It is not necessary to focus for different
negative sizes.
◊ For the Omega D Series, the optional bracket is
required to attach the cold light to the four (4) raising
and lowering arms on the column.
2. Connect the cable from the light head into the back of the power supply.
3. Plug the three-prong power cord into any 115 Vac outlet.
4 Plug the two-line cord into any 110 Vac timer with a 1.5 W or more capacity.
5. Turn on the main power switch and allow 10 to 15 minutes for the thermostatically controlled heating system in your
light head to warm the lamps to optimum operating temperature. This will insure consistent light output during each
exposure. Turning the lamps on for two to three minutes at the start of a printing session is benecial and will hasten
the warm-up.
Caution:
The lamps do generate moderate amounts of heat on their own. Excessive on time can cause light loss. This is a tempo-
rary condition. When turned off and allowed to cool to the thermostat setting (95°F on the top of the lamp head) the light
level will increase and return to normal. Repeat overheating will degrade the light output faster than normal and shorten
lamp life. Proper work habits are important and will insure consistency.
VCL4500 Back Shown

Aristo Archive Information
Typical VCL4500 Front Electronics Box Shown
#6 in ON position, #4 provides;
Blue Max: = blue only at maximum brightness
Blue/Off: = blue only with fully adjustable brightness control
Green/Blue: = Green and blue combined with blue intensity being fully adjustable
#6 in OFF position, #4 provides;
Blue Max: = blue only at maximum brightness
Blue/Off: = off only
Green/Blue: = Green only, no blue
Note:
For printing without timer, cold light may be turned on and off by plugging two line cord directly into a 110Vac outlet with an ON/OFF
switch Capability.
The LED numerical display is not meant to represent each exact paper grade when dialing up from 0 toward 5.
With switch No. 6 in the ON position and switch No. 4 in the green and blue color mode, you can dial in any contrast.
The minimum brightness level of the blue lamp is set at the factory to provide and approximate minus 0 starting point
with the display at 0.0. This can be manually re-adjusted according to what brand of paper you are using.
Re-adjusting of No. 7 only effects the starting point
and not the maximum brightness of the blue lamp.
High contrast is obtained with the LED set at 5.0 and printing times
may have to be reduced by 50% from mid range settings.
Switching to the maximum blue or blue adjustable position will print
extra hard and yield an approximate grade 5.5 depending on the paper and chemistry used.

Aristo Archive Information
For split printing on variable contrast papers,
switch No. 6 should be in the OFF position.
It is then simply a matte of selecting BLUE ONLY or
GREEN ONLY from switch No. 4.
For printing on graded papers switch No. 6 should
be used in the ON position.
Graded papers primarily like the blue energy spectrum.
You can now select maximum blue, blue with adjustable
intensity or blue and green combined. In the blue adjustable
position you can set the intensity level to control printing speeds or adjust for dry down time. You can also print with
blue and green combined and may nd it possible on some papers to achieve plus or minus a half grade by
adjusting the blue green ratio.
The thermostatically controlled heater is preset at the factory for average room temperature (70°F).
Should your darkroom be above or below average or have wide temperature swings because of
heating or air conditioning ducts close by, you may need to readjust. See the thermostat adjustment sheet.
Familiarize yourself with the function and location of the controls shown in the product specication sheet.

Aristo Archive Information
Caution: Instructions are for guidance only.
Aristo/Voltarc will not be responsible for any damage to lamp or lamp housing for items improperly installed.

Aristo Archive Information
Caution: Instructions are for guidance only.
Aristo/Voltarc will not be responsible for any damage to lamp or lamp housing for items improperly installed.
Power Supply