Hughes Jvc 220 Projector Service Manual

Chapter 4---Maintenance (Removal/Replacement) 
 
Figure 4-4.  Ignitor Assembly and Arc Lamp Power Supply 
4.6  Arc Lamp Power Supply 
To remove the Arc Lamp Power Supply: 
1.   Remove the front cover (Section 4.2). 
2.   Remove the lower-right-front-side panel by removing 
the 5 pozidrive screws securing it. 
3.   Remove the 2 pozidrive screws from the bottom of the 
EMI shield and slide it out of the way to the left. 
4-8  Model 220 Service Manual  

 Chapter 4---Maintenance (Removal/Replacement) 
 
Figure 4-5.  Arc Lamp Power Supply connections. 
4.   Remove and label the cables from the DC OUTPUT 
terminal, J74 (see Figure 4-5 for cable connections).  
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 of the projector. 
9.   Replace the Arc Lamp Power Supply in reverse order 
from above. NOTE: When replacing the cables on the 
±...

Chapter 4---Maintenance (Removal/Replacement) 
These connectors may be difficult to 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...

 Chapter 4---Maintenance (Removal/Replacement) 
 
Figure 4-6   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 
4-6 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 upper left of...

Chapter 4---Maintenance (Removal/Replacement) 
14. Grasp the HVPS at the bottom and lift upward and 
outward so that it slides away from the bottom screws. 
15. Reinstall the HVPS in the reverse order from above. 
When reinstalling, be sure that the HVPS slides over 
the bottom screws and the lip at the top of the 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...

 Chapter 4---Maintenance (Removal/Replacement) 
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.   Disconnect 6 connectors; J31, J32, J33, J38, J39, and 
J40. (Figure 4-6). Move the cables out of the way. 
 
Figure 4-7.   Convergence/Deflection PCB. 
4.   Loosen (not necessary to...

Chapter 4---Maintenance (Removal/Replacement) 
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 Electronic Module card cage....

 Chapter 4---Maintenance (Removal/Replacement) 
 
Figure 4-8.   Horizontal/Vertical Deflection PCB. 
4.12   Video Input Cards (VICs) 
The 4 types of Video Input Cards, RGB Standard, 4X RGB Mux (4 
RGB Input), Quad Decoder, and HDTV (YPbPr) are all removed 
and inserted in the same manner.  
To remove a VIC: 
1.   Disconnect all video input connections from the VIC to 
be removed. 
2.   Remove the 2 flathead screws that secure the VIC to 
the projector rear panel. 
3.   Grasp the VIC connector bracket and...

Chapter 4---Maintenance (Removal/Replacement) 
loosen it. Use care not to let the flathead screwdriver 
slip out of the slot and possibly damage components. 
Do not use a screwdriver or any other tool to tighten 
this ring-it should be hand-tight only.  
CAUTION! This step is performed with the CRT Socket 
Connector still connected to the Green CRT and the 
ground wire still connected from the CRT/Yoke Assembly 
to the CRT Socket Connector. This is because the Green 
CRT Socket Connector is close to the...

 Chapter 4---Maintenance (Removal/Replacement) 
 
Figure 4-9.   Video Amplifier PCB showing breakaway CRT Socket 
Connectors. 
10. Disconnect the 3 Focus cables that run from the CRT 
Socket Connectors to the Focus connectors on the 
HVPS. NOTE: Observe that each of the 3 Focus 
cables (large, red wires that run from each CRT Socket 
Connector to the Focus connectors on the HVPS) is 
joined near the CRT by a coupler plug and jack. 
Disconnect (and label) the focus cables at these 
couplers. 
11. Loosen...