Hughes Jvc 220 Projector Service Manual

							Chapter 3 Service Adjustments 
3.4 ILA® Back Focus 
The ILA® Back Focus adjustment moves the ILA®/Relay Lens/CRT 
assemblies together to adjust the focal length. This adjustment 
allows the zoom lens’ tracking to remain focused throughout the 
entire range. Use focus test pattern to perform this adjustment one 
color at a time. This procedure performs the Green ILA® Back 
Focus. 
For best results, perform ILA® Back Focus with 2 people.  One 
person will watch the screen close-up and the other will move the 
ILA®/Relay Lens/CRT assemblies back and forth. The adjustment 
is factory-set but may need some touch-up in the field. 
To adjust the ILA® Back Focus: 
1. Remove the rear cover (Section 4.2). 
2. Tilt up the Electronic Module (Section 3.3). 
3. For this procedure, view Green. Hide Red and Blue. 
4. Select the Focus test pattern. 
5. Select Projection Lens from the menu. 
6. Use the up/down arrow keys to zoom the Projection Lens to full 
telephoto position (smallest image). NOTE: Skip this step when 
using an optional fixed lens. 
7. Use left and right arrows to focus the projection lens to get 
sharply focused spacer balls.  NOTE 1: Spacer balls are used 
inside the ILA® Assembly to separate the layers. They are tiny, 
random, irregularly-shaped spots that are visible throughout the 
image.  Look directly in front of the screen in the lighter areas of 
the image to view. From throw distances shorter than 4 meters, 
spacer balls are difficult to see.  
8. Zoom the lens to a wide angle position (largest image). NOTE: 
Skip this step when using an optional fixed lens. 
9. Put on safety gloves (see Safety section for gloves type) then 
loosen the wing nut on the Green Relay Lens (or whichever 
lens is being focused). NOTE: If the ILA®/Relay Lens/CRT 
assembly cannot be moved close enough to get a good spacer 
ball focus, loosen the CRT Lens Stopper Ring in front of the 
CRT Holder Ring (Figure 3-5).  Move the CRT snug against the 
collar to get additional range, and then, retighten the collar. 
10. Loosen the 2 hex bolts (Figure 4-12) on the ILA® assembly in 
front of the Relay Lens. 
11. Slide the Relay Lens/CRT/ILA® assembly forward or backward 
until the sharpest spacer ball focus is achieved. NOTE: Do not 
use the zoom lens focus while performing this step. 
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12. Repeat Steps 6-11 until the spacer balls stay in focus through 
the entire zoom range. The spacer balls may go slightly out of 
focus in spots while zooming up or down, but they should be in 
focus at the smallest and largest images. 
13. Tighten the hex bolts on the Green ILA® Assembly and the 
wing nut on the Green Relay Lens. 
14. Repeat Steps 6-11 above for any other assembly needing ILA® 
Back Focusing. Be sure to hide the other 2 colors. 
 
NOTE: The CRT Mechanical Focus procedure (Section 3.5) is often 
performed sequentially with the CRT Rotation procedure (Section 3.6). The 
same two set screws (Figure 3-5) are loosened when doing either of these 
procedures. When performing the procedures in sequence, ensure the two s\
et 
screws are secured when either the focus lock screw or the CRT thumbscrew 
is tightened after finishing each adjustment. Do not leave the set screws loose 
when securing either the focus lock screw or the CRT thumbscrew. Turning 
either one of these adjustments while the set screws are loose may 
cause the CRT to go out of focus or rotate. 
3.5 CRT Mechanical Focus 
The CRT Mechanical focus is factory-set and will not normally 
require adjustment. When a CRT is replaced, the CRT mechanical 
focus must be reset. Adjust colors individually.  After completing, 
recheck other colors for additional adjustment.  Replacing the CRT 
could cause other colors to become misadjusted.  Use the Focus 
test pattern (an external signal or other test patterns can also be 
used) for adjustment. 
To adjust the CRT Mechanical Focus: 
1. Remove the rear cover (Section 4.2) 
2. Tilt the Electronic Module to the full up position (Section 3.3). 
3. Select the Focus test pattern. 
3. Zoom the Projection Lens to the widest angle (largest image) 
and adjust the Projection Lens focus for the sharpest image of 
the Focus test pattern. 
4. Tilt up the Electronic Module (Section 3.3). 
5. Loosen the two set screws (Figure 3-5) near the top of the CRT 
sleeve. 
6. Loosen the CRT focus lock screw located on the Guide Plate at 
the top of the CRT shield (Figure 3-5). The CRT is now free to 
slide. 
7. Grasp the CRT thumbscrew (Figure 3-5) and slide the CRT 
back and forth until the image is focused as sharply as possible 
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							Chapter 3 Service Adjustments 
(be careful not to loosen the CRT thumbscrew which could 
cause the CRT to rotate). 
8. Tighten the set screws first, then the CRT focus lock screw. 
NOTE: Tighten set screws before focus lock screw. The focus 
lock screw can slightly defocus or rotate the CRT as it is being 
tightened if the set screws are loose. 
9. Repeat the above steps for the Red and Blue CRTs. 
 
Figure 3-5.   CRT Mechanical Focus adjustments. 
3.6 CRT Rotation 
The CRT tilt adjustment aligns the CRT level with the screen. This 
is a factory-set adjustment and should not need adjusting unless 
the CRT or yoke is moved. 
Remove the rear cover (Section 4.2) and tilt the electronic module 
up (Sections 3.3).  
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1. Select Test Pattern 8, Center/Lin. 
2. View the color for the CRT that requires rotation. Hide the other 
2 colors. 
3. In the Geometry menu, set “Reg Enable” to off by unchecking 
the box. Unchecking the Reg Enable box temporarily disables 
any convergence corrections that have been performed with a 
different CRT/Yoke assembly and sets these values to the 
default levels so that CRT Rotation can be accomplished 
correctly. 
4. In the Geometry menu, access Bow, Skew, Pincushion, and 
Keystone. Note the values for each setting.  After recording 
values, set each to the default level of 128 (For Skew, select 
the color of the CRT that is to be rotated-the other functions are 
not color-selectable). This is done so that the CRT Rotation can 
be properly performed without the influence of any previous 
corrections made for these adjustments. 
5. Loosen the 2 set screws (Figure 3-5) near the top of the CRT 
sleeve. 
6. Loosen the CRT Thumbscrew (Figure 3-5) on the top of the 
CRT Assembly.  
7. Tilt the yoke by grasping the Thumbscrew and moving it in 
whichever direction it takes to make the CRT raster square.  
8. When the CRT raster is square on the screen, tighten the 2 set 
screws first, then the CRT thumbscrew. 
9. In the Geometry menu, toggle the Reg Enable box back to On.  
10. Reset Bow, Pincushion, Keystone, and Skew (select proper 
color for Skew) to the values noted previously in Step 4. 
11. Recheck Bow, Pincushion, Keystone, and Skew and readjust if 
necessary. Also recheck Convergence (refer to the Model 220 
User’s Guide). 
12. Repeat the above procedure for any other CRT that is not level. 
 
3.7 CRT Electronic Focus 
The Electronic Focus is factory-set and will not normally need to be 
adjusted except after component replacement, maintenance, or if 
wide temperature variations exist between the factory and the field 
location. View one color at a time. 
1. Select the Focus test pattern. 
2. Zoom the Projection Lens to the widest angle and adjust the 
Projection Lens focus for the sharpest image. 
3. View Green. Hide Red and Blue. 
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							Chapter 3 Service Adjustments 
4. Adjust the Green Electronic Focus (Figure 3-6) for a sharp 
focus of the H pattern at the center of the screen. 
5. Repeat the above steps for Red and Blue. 
 
Figure 3-6.   RGB Electronic Focus adjustments. 
3.8 ILA® Overlap 
This adjustment positions the ILA® assemblies in their sockets. 
Adjustment should only be made once or whenever an ILA® is 
replaced. 
To determine if this adjustment is necessary: 
1. Note the value of the ILA® bias for Red, Green and Blue so 
they can be returned to these levels when this procedure is 
complete.  
2. Hide all three colors. 
3. Increase the ILA® biases to maximum for all 3 colors. With all 3 
colors at maximum, the image on the screen should be a white 
screen with some colors at the edges. 
4. Observe the right, left, top, and bottom of the screen. Normally, 
green is the reference to which blue and red will be matched. 
(NOTE: If the green ILA® was replaced, the blue or red image 
should be used as the reference to which green is matched.) If 
a red or blue border is present on either side or at the top or 
bottom the ILA® overlap needs adjustment. If both red and blue 
overlap, the border will be yellow. In either case, proceed with 
the adjustment below. If there is no overlap, reset the ILA® 
biases to their previous levels from Step 2. 
To perform an ILA® Overlap adjustment: 
Remove the rear cover (Section 4.2) and tilt the electronic module 
up (Sections 3.3).  
1. Continue with all three colors hidden. 
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2. Loosen the 2 wing nuts at the top of the ILA® assembly to be 
adjusted (Figure 4-12). 
3. If the overlap is at the left or right, grasp the ILA® assembly and 
slide it to the right or left so that the edges coincide with the 
edges of the other two ILA® assemblies. CAUTION! To avoid 
damaging the connector, grasp the ILA® assembly itself, not 
the connector at the top. 
4. If the overlap is at the top or bottom, be sure the projector is 
level, then slide the spring clip (Figure 4-12) at the top of the 
ILA® assembly backward and remove the ILA® assembly (it will 
slide out with some resistance). Observe there are two 
adjustment screws at the bottom of the ILA® assembly which 
allow for up and down movement. Turn these screws in or out 
very slightly to allow the ILA® to seat lower or higher, 
whichever is needed. 
5. Reinstall the ILA® assembly and replace the spring clip. 
6. Repeat Step 4 if adjustment is still needed. 
7. Retighten the 2 wing nuts. 
8. Reset the ILA® biases to their previous levels from Step 2. 
3.9 Front/Rear or Inverted Projection Jumper Settings 
3.9.1 Front/Rear Jumper Setting (Horizontal Reverse) 
The Horizontal Scan Reversal Jumper reverses the image 
projection for front or rear projection. Figure 3-7 illustrates the 
jumpers’ location on the Scan Reversal Board, and the proper 
location for front and rear projection.  
The Model 220 Projector is shipped with the jumper plugs inserted 
in J50 and J100 for front projection. For a rear projection setup, 
these jumpers must be inserted into JA50 and J101. 
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Figure 3-7.   Scan Reversal Board. 
To set the Horizontal Scan Jumper: 
1. Turn power off at the projector and wait for the arc lamp to cool. 
2. Remove the projector rear cover (Section 4.2). 
3. Verify that the jumper is plugged into JA50 and J101 for rear 
projection or J50 and J100 for front projection (See Figure 3-7). 
Change jumper if necessary. 
4. Replace the projector cover. 
5. When changing jumpers for front or rear screen projection, 
Centering, convergence and shading must be rechecked. 
3.9.2 Inverted Vertical Jumper Setting 
The Ceiling/Floor jumpers invert the image vertically for use in 
some situations that use mirrors or ceiling projections. Figure 3-6 
illustrates the location of the jumpers on the Scan Reversal Board 
and indicates the proper location for ceiling or floor projection. The 
Model 220 Projector is shipped in the normal vertical projection 
position with the jumper plug inserted into J53. For an inverted 
vertical setup this jumper plug must be inserted into J53A. (Refer to 
Figure 3-7). 
To invert the vertical image: 
1. Turn power off at the projector and wait for the arc lamp to cool. 
2. Remove the projector rear cover (Section 4.2). 
3. Tilt the electronic module up (Section 3.3). 
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4. Verify that the vertical jumper is inserted in the correct jacks for 
appropriate application, (see Figure 3-7).  Change jumpers if 
necessary. 
5. Replace the electronic module and rear cover. 
6. When changing jumpers for floor or ceiling screen projection, 
Centering, convergence and shading will need to be rechecked. 
3.10 Vertical and Horizontal Size Settings 
Adjust the vertical height pots and horizontal size coils when 
replacing the Horizontal/Vertical Deflection board, Scan Reversal 
board, or CRT/Yoke assembly. They may also be needed when the 
convergence adjustment procedures fail to bring the colors into 
convergence. 
 
Figure 3-8. Horizontal/Vertical Deflection Board. 
To adjust the Vertical height (see Figure 3-8): 
1. Remove the rear cover (Section 4.2).  
2. Select Test Pattern 5, X-hatch. 
 NOTE: Green is the master to which Red and Blue will be 
matched. The Green height pot should not need adjustment 
except when the Green CRT assembly has been replaced. 
3. Hide Blue and view Red and Green. 
4. If Red is higher than Green at the top and lower than Green at 
the bottom of the X-hatch image, or If lower than Green at the 
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top and higher at the bottom, adjust Red vertical pot to correct 
the error. 
 If Red is higher than Green at the top and bottom, or lower than 
Green at the top and bottom, this is most likely caused by Red 
not being centered correctly and can be corrected with the 
centering adjustment (User’s Guide, Section 5.5.11).  
 If the Red height pot does not completely eliminate the 
difference in height between Red and Green, balance the error 
at the top and bottom. Too much of an error at the top or 
bottom makes convergence procedures harder to accomplish.  
5. Repeat Steps 2 and 3 above for Blue while hiding Red. 
6. Recheck all Geometry and Convergence settings (see User’s 
Guide) and readjust wherever necessary. 
 
To adjust the horizontal size coils (see Figure 3-7): 
1. Continue to use Test Pattern 5, X-hatch. 
2. Hide Blue. View Red and Green. 
3. If Red is outside of Green on both sides, or inside of Green on 
both sides, use a Delrin .100 hex alignment tool to adjust the 
Red horizontal size coil to correct the error. If Red is outside of 
Green on one side and inside of Green on the other side, this is 
most likely caused by Red not being centered correctly and can 
be corrected with the centering adjustment (User’s Guide, 
Section 5.5.11).  
If the Red horizontal size coil does not completely eliminate the 
size error between Red and Green, balance the error on both 
sides to allow for easier convergence. 
4. Repeat Steps 2 and 3 above for Blue while hiding Red. 
5. Recheck all Geometry and Convergence settings and readjust 
wherever necessary. 
6. Replace the electronic module and rear cover. 
3.11 Software Updating 
The Model 220 software resides in Flash Memory and is updated 
via the projectors serial Port A. To perform an update, a disk 
containing the updated Boot Software (boot.hex) and/or System 
Software (zsys.hex) and a PC with Windows 3.1 (avoid Windows 
95 at this time) is required to perform update.  
Boot Manager Software and System Software are separate 
products. Each may be updated independently. The System 
Software will depend on a specific version of the Boot Manager. 
Refer to the System Software release bulletin for Boot Manager 
version dependencies.  
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To perform software upgrade: 
1. Verify that the projector circuit breaker is off. Use a Null Modem 
cable to connect a PC to the projector’s Serial Port A. 
2. Start Windows 3.1. 
3. Click on the terminal icon from the Accessories Directory. 
4. From the Terminal menu, select Settings-Terminal Emulation 
and click on DEC-VT-100(ANSI).  
Select OK. 
5. Under Settings choose Terminal Preferences. 
6. Under Terminal Preferences the following selections are 
appropriate; Terminal Modes=Sound, CR->CR/LF=Both off, 
Columns=80, Cursor=Block & Blink, Terminal Font=Fixedsys 
15, Translation=None, Show Scroll Bars=On, Buffer Lines=100, 
Use Function Arrow & Control Keys for Windows=Off. Select 
OK. 
7. Under Settings select Text Transfer=Standard Flow Control. 
Select OK. 
8. Under Settings select Communications and choose; 
Connector=select the PC port being used, Baud Rate=9600 or 
19200 (depending on the System Controller Switch block Pos 
4-see note below this step), Data Bits=8, Stop Bits=1, 
Parity=None, Parity Check=Off, Carrier Detect=Off, Flow 
Control=XON/XOFF. Select OK. 
NOTE: Switch position 4 on the switch block at the card edge of 
the System Controller (see Figure 5-1) controls the baud rate 
for Serial Port A for the Boot Manager and System Software. 
Down=9600, Up=19200. Ensure the other SCB switches (1, 2, 
and 3) are in the Down position.  
9. Turn the projector circuit breaker on while depressing and 
holding down the service mode switch on the SCB (see Figure 
5-1) for at least 5 seconds or until Boot Manager appears on 
the terminal monitor. The Power On LED stays Red.  
10. The following should be displayed on the Windows Terminal 
screen (where x.x.0 is the currently loaded Boot Manager 
version (e.g. 0.9.0 or 1.1.0). 
 –Boot Manager Ver x.x.0 (Service Mode Startup) 
 –Copyright (c) 1994 Hughes JVC Technology 
 –Command: _ 
11. Verify that the Boot Manager version is correct. If it is 
necessary to update the Boot Manager, perform the following 
steps. If the Boot Manager is already up to date, skip to Step 12 
to update the System Software.  
11A. Enter the command loadboot at the prompt. You should 
see the following output: 
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