Hughes Jvc 220 Projector Service Manual

Chapter 5---Troubleshooting 
 
Figure 5-2.   Left side of projector with rear cover off. 
 
Figure 5-3.   Right Side of projector with rear cover off. 
 
5-2 Model 220 Service Manual  

Chapter 5---Troubleshooting 
   
Figure 5-4.   Convergence/Deflection and Video Amplifier LEDs. 
5.2   Error Codes 
For certain errors that may occur in the Model 220 Projector the softwar\
e 
provides error codes that are helpful in determining the nature of the 
problem. These error codes can be seen on the left side of the monitor 
screen when using a PC connected to Port A or Port B.  
Table 5-1.   Error Categories: 
CATEGORY 
NUMBER ERROR CATEGORY DESCRIPTION 
1 CEXEC Operating System. 
2 FLASH HW...

Chapter 5---Troubleshooting 
The first column of the table lists the error number code that appears o\
n 
the PC screen. The second column describes the on-screen text. The 
third column provides a description of the problem and any other pertine\
nt 
information. 
Table 5-2.   Error Codes. 
ERROR 
NUMBER ON-SCREEN TEXT DESCRIPTION 
1.5 “Invalid read/wrt” Software error-mismatch. Open mode vs. Write or 
Read command. 
1.12 “Ser parity error” Serial Port Parity error-not currently used. 
1.13 “Bad dev I/O...

Chapter 5---Troubleshooting 
4.7 “VP PCA Missing” “No Slave Ack” status on first poll of VP. 
4.8 “VP PCA Not OK” VP_OK is High (BAD) 
4.9 “RTG PCA Missing” “No Slave Ack” status on first poll of RTG 
4.10 “RTG PCA Not OK” RTG_OK is High (BAD) 
4.14 “Lamp Startup” Lamp Failed to light (/LAMP_LIT_B not Low for 3 
seconds out of 20 seconds.) 
4.15 “Low Voltage PS” Low Voltage PS failed (/LV_OK_B is High). 
4.16 “High Voltage PS” High Voltage PS failed (/HV_OK_B is High). 
4.17 “VIC1 Board Not OK” /VIC_OK...

Chapter 5---Troubleshooting 
5.3.   Troubleshooting Guide 
Table 5-2 shows some common projector problems, what to check when problems occur, possible 
solutions and the section in this Service Manual (If User’s Guide co\
ntains pertinent information, the 
appropriate section will be given) that provides some related information on the problem. 
Table 5-3. Troubleshooting Guide. 
PROBLEM CHECK POSSIBLE SOLUTION SECTION 
No Power Main Circuit Breaker on 
Projector rear panel. 
Reset Circuit Breaker....

Chapter 5---Troubleshooting 
Table 5-3.   Troubleshooting Guide (continued) 
PROBLEM CHECK POSSIBLE SOLUTION SECTION 
Arc Lamp Brightness flicker or 
picture is very dim. 
Arc Lamp may have too 
many hours of usage. 
Replace Arc Lamp. 
4.4 
Image out of focus Spacer balls not visible. Perform the Projection 
Lens Focus procedure.  
User’s Guide 5.5.15 
 ILA® “spacer balls” are 
visible but the image is 
fuzzy. 
Perform the CRT 
Mechanical Focus 
procedure. 
3.5 
 CRT focus range is 
limited and the image...

Chapter 5---Troubleshooting 
PROBLEM CHECK POSSIBLE SOLUTION SECTION 
XY Convergence Not enough range in Red 
or Blue XY convergence. 
Adjust Red or Blue 
CENTERING to match 
Green. 
5.5.11 
Picture Color 
Balance 
Red, Green, or Blue is 
missing in the image. 
ILA® assembly bias 
voltage is incorrect or 
there is no signal-replace 
Video Amplifier Board. 
4.13 
 Red, Green, or Blue 
lacks color. 
Replace ILA® assembly 
or Video Amplifier Board. 
4.16, 4.13 
 Grey scale test pattern is 
correct but image...

Chapter 5---Troubleshooting 
 
Table 5-3.   Troubleshooting Guide (continued) 
PROBLEM CHECK POSSIBLE SOLUTION SECTION 
Picture-Various 
Problems 
Image jitter and noise. Replace Video Processor 
Board. 
4.8 
 Image jitter present at 
one source only. 
Replace Raster Timing 
Generator. 
4.8 
 Image is not level. Level the projector or 
rotate the CRT Yoke. 
3.6 
 “Flagwaving” at top of 
picture or top of image is 
skewed. 
VTR mode checked in 
Timing menu. Deselect 
VTR mode.  
User’s Guide 4.9...

Chapter 5---Troubleshooting 
5-10 Model 220 Service Manual 
  

   Chapter 6---Parts List 
6.0  Parts List 
 
 DESCRIPTION PART NO. 
Bottom Cover Assembly 102614 
Arc Lamp/Heat Sink Assembly 104452 
Cathode Ray Tube (CRT) 103465 
CRT/Yoke Assembly 103350 
Diffuser, Holographic 104207 
Electronics Cover Assembly 102613 
Ignitor Assembly, 750W (Ignitor & Laser P.S.) 103671 
ILA®, SM Moving 3 x 4 Video (High Contrast) 
Add for Blue -44, for Green -45, for Red -46. 
102630 
 
ILA®, SM Moving 3 x 4 Video (Reduced Aperture)
Add for Blue -44, for Green -45, for Red -46....