Hughes Model 230 Projector Service Manual

Chapter 4---Maintenance (Removal/Replacement)
Model 230 Service Manual4-5
the fans to cool the Arc Lamp. The power interlock switches for both covers
are attached to each cover hinge.
5.   When the Latch Levers are inserted into the holding slots, lift the cover off.
Be careful not to brush against any of the internal components of the
projector when removing the cover. If any undue resistance is felt, stop to
locate the source before proceeding.
6.   Replace the covers in reverse order from above. When...

Chapter 4---Maintenance (Removal/Replacement)
4-6Model 230 Service Manual
3.   Remove the lower-right-front-side panel (5 screws).
4.   Remove the Dichroic Shield (1 screw on top-connects to Arc Lamp
enclosure, 1 screw in front-connects to Arc Lamp enclosure, 1 screw on
bottom-right-connects to Ignitor board).
Figure 4-3.   Arc Lamp Assembly
5.   Disconnect the Arc Lamp blower cable.
6.   Disconnect the Arc Lamp fan cable. This cable is routed through the bottom
of the Arc Lamp assembly enclosure (below...

Chapter 4---Maintenance (Removal/Replacement)
Model 230 Service Manual4-7
Figure 4-4.   Arc Lamp cable and clamp.
7.   Label and disconnect both Arc Lamp cables from the Ignitor board (Figure 4-
5). These are called out as Positive Common and Negative Output in
Figure 4-5. Return these cables with the Arc Lamp assembly
8.   Remove the two holding bolts that secure the Arc Lamp Enclosure to the
projector (Figure 4-4).
9.   Carefully slide the Arc Lamp assembly out.
9.   Reinstall the Arc Lamp in reverse...

Chapter 4---Maintenance (Removal/Replacement)
4-8Model 230 Service Manual
Figure 4-5.   Ignitor Assembly.
4.6  Arc Lamp Power Supply
To remove the Arc Lamp Power Supply:
 CAUTION!It is strongly recommended that the Arc Lamp
current be turned down (see Section 3.1) before installing a new Arc Lamp to
help prevent possible damage that could reduce the life of the new lamp.
1.   Remove the front cover (Section 4.2).
2.   Remove the lower-right-front-side panel by removing the 5 pozidrive screws
securing...

Chapter 4---Maintenance (Removal/Replacement)
Model 230 Service Manual4-9
Figure 4-6.  Arc Lamp Power Supply connections.
4.   Label and remove the cables from the DC OUTPUT terminal, J74 (see
Figure 4-6 for cable connections). Retain the .47µfd capacitor, connected
across the terminals, to be reinstalled on the replacement power supply.
5.   Disconnect J71 (AC Input).
6.   Disconnect J72 (SIGNAL CABLE).
7.   Disconnect J73.
8.   Remove the 2 screws at the bottom of the ALPS and carefully slide it out...

Chapter 4---Maintenance (Removal/Replacement)
4-10Model 230 Service Manual
remove and it may be necessary to angle the LVPS partly out of the chassis
in order to get a firmer grip on the connectors.
5.   Remove the 2 screws on the bottom side of the LVPS and carefully slide it
out of the projector.
6.   Reinstall the LVPS in reverse order. After the LVPS is installed, recheck
Timing, Geometry, Electronic Focus, ILA
® Bias/Sensitivity, Convergence, G2,
and Shading.
4.8  High Voltage Power Supply
To remove...

Chapter 4---Maintenance (Removal/Replacement)
Model 230 Service Manual4-11
Figure 4-8   High Voltage Power Supply.
3.   Carefully slide the cover upward and outward to remove it.
NOTE:  For the remainder of this procedure refer to Figure 4-8 above.
4.   Disconnect the 3 CRT anode cables.
5.   Disconnect P44-G2 Out (at the middle-front of the HVPS).
6.   Unsnap the cable clamp at the top of the HVPS.
7.   Remove the anode cables and the P44 cable from the cable clamp.
8.   Disconnect P45 (“Control”) at...

Chapter 4---Maintenance (Removal/Replacement)
4-12Model 230 Service Manual
projector frame. Make sure each anode cable “snaps” back into its
receptacle. The receptacles are about 2” inside the hole where the cable fits
into. Also, be sure the rear flap on each focus cable connector snaps over
the square socket securely-wiggle the connector a little to make it fit over.
16. Replace the HVPS cover. After the HVPS is replaced, recheck CRT Mech
Focus, Yoke Alignment, G2, and Electronic Focus.
17. Replace the...

Chapter 4---Maintenance (Removal/Replacement)
Model 230 Service Manual4-13
NOTE: To remove connectors on the printed circuit boards in the sections
below, push the connector in slightly, then squeeze the tab and pull the
connector out.
4.10  Convergence/Deflection PCB.
The Convergence/Deflection PCB is located on the bottom side of the Electronic
Module card cage.
To remove the Convergence/Deflection PCB:
1.   Remove the rear cover (Section 4.2).
2.   Tilt the Electronic Module up. (Section 3.3).
3....

Chapter 4---Maintenance (Removal/Replacement)
4-14Model 230 Service Manual
NOTE: it may be necessary to fit the top 2 fins of the heat sync over the
electronic module frame lip at the left to get enough clearance for the right
side to be installed. Carefully fit the board over the mounting screws and
slide the board into position. Tighten the screws and reconnect the
connectors.
4.11   Horizontal/Vertical Deflection PCB
The Horizontal/Vertical (H/V) Deflection PCB is located in the upper portion of
the...