Hughes JVC Projector 250 Sc Service Manual

Chapter 3---Electrical
Model 250 Service Manual 3-15
3.4 Igniter Assembly
The Igniter Assembly consists of the Igniter and the Laser Power Supply. The
Igniter and Laser Power Supply are replaced as one unit.
Igniter Assemby - Main Functions:
!
 Generates 32 kV pulse to light Arc Lamp Power
!
 Acts as link between Arc Lamp Power Supply and Arc Lamp during normal
Arc Lamp operation
Igniter Assembly - Inputs
!
 +170 V - From the Arc Lamp Power Supply during Arc Lamp lighting.
!
 25-31 V at 70-85 A - From...

Chapter 3---Electrical
3-16 
Model 250 Service Manual
Figure 3-7  
Igniter Assembly.
Igniter Assembly -  Service Adjustments
There are no service adjustments performed on the Igniter Assembly.
Igniter Assembly - Remove and Replace
Replace the Igniter and the Laser Power Supply as one unit.
Tools Needed
2 - 7/16-inch wrench (one open end wrench)
#1 Pozi-drive Phillips-head screwdriver
Parts Needed
Igniter Assembly  p/n 106570
To remove the Igniter Assembly
1. Power the projector Off by IR Remote or PC,...

Chapter 3---Electrical
Model 250 Service Manual 3-17
5. Disconnect the orange cable attached to the input side of the Igniter
Transformer using the 7/16-inch wrench. This cable will have black shrink
sleeving on it. It goes to the negative terminal of the Arc Lamp Power
Supply.
6. Disconnect the orange Cathode cable from the Igniter ground post using
the 7/16-inch wrench. Remove the other orange cable that goes to the
positive terminal of the Arc Lamp Power Supply.
7. Remove the five #1 Pozi-drive...

Chapter 4---Optical
Model 250 Service Manual 4-1
4.0 Optical
Contents
4.1  Arc Lamp...................................................................................................... 4-2
4.2  Optical Path .................................................................................................. 4-7
4.3  ILA
®............................................................................................................. 4-13
4.4  Relay Lenses...

Chapter 4---Optical
4-2 
Model 250 Service Manual
4.1 Arc Lamp
The Arc Lamp is the beginning of the high intensity Light Path. It is located
inside a housing on the right side of the Optical Support Assembly (see Figure
4-5).
Arc Lamp - Main Functions:
The Arc Lamp is a single component composed of a Xenon gas bulb at the center
of a compound elliptical reflector. It supplies the high intensity white light used
by the projector to put a very bright image on the screen. The expected 50% life
(half of...

Chapter 4---Optical
Model 250 Service Manual 4-3
  CAUTION! Fan disconnection is acceptable for a short
period of time only (preferably 

Chapter 4---Optical
4-4 
Model 250 Service Manual
Hot spot
off-center
Figure 4-1   
Arc Lamp “Hot Spot” (brightest area) is off-center vertically and
horizontally. Adjust to center the “hot spot”.
 
Figure 4-2  
Arc Lamp alignment fixture.
  

Chapter 4---Optical
Model 250 Service Manual 4-5
Figure 4-3  
Arc Lamp Assembly access door.
Arc Lamp - Remove and Replace
The Arc Lamp Enclosure Assembly consists of the Xenon Arc Lamp module and
blower. Replace the blower together with the Arc Lamp Module.
Tools Needed
7/16 inch wrench
#1 Pozi-drive Phillips-head screwdriver
Diagonal wire cutters (or equivalent)
Parts Needed
Arc Lamp p/n 106298
  WARNING!!!  Dangerously bright light and high current
exist in this area of the projector. Before...

Chapter 4---Optical
4-6 
Model 250 Service Manual
5. Disconnect the orange Cathode cable from the Igniter, using the 7/16-inch
wrench (see Figure 3-7).
6. Cut the cable tie that is wrapped around the ferrite inductor (metal tube
with white cap below the blower).
7. Disconnect the Arc Lamp door fan cable. This cable runs through the door
and out the bottom of the Arc Lamp Assembly housing (below the right
side inFigure 4-3). It provides power to the Arc Lamp door fan through the
white socket shown to the...

Chapter 4---Optical
Model 250 Service Manual 4-7
Figure 4-4  
Arc Lamp Assembly top view.
4.2 Optical Path
Optical Path - Main Function
!
 Transports the Arc Lamp high intensity light from the Arc Lamp to the
ILA® and from the ILA® to the Projection Lens
!
 Removes the Infrared light that contains most of the heat
!
 Removes the unwanted Ultraviolet light
!
 Condenses the white light using the Light Pipe for a uniform output
!
 Separates the white light into its RGB component colors using Dichroic...