LG devices service manuals. LG circuit diagrams, schematics and flowcharts, service guides, replacement hardware lists and repair manuals are taken from the company's official website.
One is the very sophisticated head discribed by John which has 2 tubes, one for low contrast and one for high contrast. The controller mixes the light in the tubes to achieve the desired contrast. The one made by Zone VI (sold by Calumet) has the built in tempature controller that various the time automatically. Aristo also makes a similar product, but I don't know if it compesates for tempature variation. Both of these cost over $1,000 USD.
Aristo also makes a 'regular' cold light head using a single 'V54' tube that is compatiable with VC filters (although there is no filter drawer provided with the head). These heads do not contain built-in time compsentation like the Zone VI model, but they do have a tube warmer that should be plugged into the electrical outlet at least 10 minutes before printing. The tube warmer helps, but does not completely solve the problem of light intensity drift. These models cost about $250 USD new. To completely compensate for light intensity drift, it is possible to purchase a Zone VI compensating enlarger timer (which also requires that a light sensor be added to the existing cold light head). Both the Zone VI compensating enlarger timer and light sensor can be purchased from Calumet for about $500 USD. Sometimes these are available used on e-bay.
Another solution is a used Zone VI Cold Light Stabilizer (no longer made) that is sometimes available on e-bay (also requires the installation of the light sensor on the cold light head). The Zone VI Cold Light Stabilizer requires the use of an external timer. One recently sold on e-bay for a bargin price of $75 (See copmpleted ebay item 1274649014) but they usually go for about $200.
There are many older Zone VI and Aristo heads without the V54 tube that do not work well with VC filter sets. These can be purchased used on e-bay for about $75-$125 USD. It is possible to upgrade some of these to V54 tubes for about $115 USD. They also work with the Zone VI Compensating Timer or Cold Light Stabilizer.
-- Michael Feldman ([email protected]), September 23, 2001.
-- Michael Feldman ([email protected]), September 23, 2001.
- Air Conditioners
- Car Electronics
- CD / DVD Recorder
- CD/DVD Players
- Cookers, stoves and ovens
- Dishwashers
- DVD, CD
![Aristo Aristo](http://img.youtube.com/vi/96AEXjBev_I/0.jpg)
- Laptops
- Microwaves
- Monitors
- Multimedia Systems
- Other
- PC
- Phones
- Refrigerators
- Remote Controls
- TV
- Vacuum Cleaners
- Video Recorders (VHS, VCR)
- Washing and Drying Machines
LG devices service manuals. LG circuit diagrams, schematics and flowcharts, service guides, replacement hardware lists and repair manuals are taken from the company's official website.
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