Hughes JVC Projector 250 Service Manual

							Chapter 7---Troubleshooting
Model 250 Service Manual 7-23
1.34“No mem available” Software error-no heap available for memory
allocation.
2.1 “Invalid Sector” Software error-invalid Flash sector number.
2.2 “Write Timeout” Flash Memory Write Failure.
2.3 “Erase Timeout” Flash Memory Erase Sector Failure.
2.4 “Verify Error” Flash Memory Write Verify Failure.
NOTE:
 Category 3 error codes may occur when power is interrupted by opening the
cover interlock switches or during power brown-outs.
3.1 “Pin Timeout” IIC Slave HW protocol error-possible on each
byte transfer.
3.2 “BB Timeout” IIC Slave HW protocol error-1st error possible
on Read or Write.
3.3 “No Slave Ack” IIC Slave HW protocol error-missing
acknowledgement on byte transfer. NOTE: This
error occurs if the slave is missing. During
Power On, this error is reported in the POWER
category.
4.1 “CD PCA Missing” “No Slave Ack” on first poll of Convergence/
Deflection PCB.
4.2 “CD PCA Not OK” /CD_OK is high (BAD).
4.3 “”HVD PCA Missing” “No Slave Ack” status on first poll of
Horizontal/Vertical Deflection PCB.
4.4 “HVD PCA Not OK” HVD_OK is High (BAD)-[/HVD_OK requires
RTG Timing.
4.5 “VA PCA Missing” “No Slave Ack” status on first poll of Video
Processor.
4.6 “VA PCA Not OK” /VA_OK is High (BAD).
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). 
						

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Model 250 Service Manual
4.17 “VIC1 Board Not OK” /VIC_OK is High (BAD) on VIC Slot 1.
4.18 “VIC 2 Board Not Ok” /VIC_OK is High (BAD) on VIC Slot 2
4.19 “VIC3 Board Not OK” /VIC_OK is High (BAD) on VIC Slot 3
4.20 “VIC1 Invalid Type” Software does not support VIC_ID in Slot 1
4.21 “VIC2 Invalid Type” Software does not support VIC_ID in Slot 2
4.22 “VIC3 Invalid Type” Software does not support VIC_ID in Slot 3
4.23 “Shutters Missing” One or more shutters not installed (BAD)
4.24 Lamp Start Not On /LAMP_OK is high, lamp module not installed,
jumper missing, ALPS bad.
No error codes in Category 5 (Flash Manager)
Most Category 6 error codes indicate RS232 communication errors and apply to
Switchers only.
6.1 “Sync Timeout” No Header found in data stream - possible baud
rate error.
6.2
“No Char Repeat” Expected data characters to be repeated - failed.
6.3
“Invalid Format” Data not in Extron or JVC Switcher format.
7.1
“Write Len Error” Ansi Output to RS232 port was interrupted -
incomplete.
8.1
“VIC Slot is empty” User has selected a Channel - VIC is not present.
8.2 “VIC Type Changed” User has selected a Channel - VIC type has
changed. User may have swapped a VIC into an
incorrect slot.
8.3
“Interpol Blocked” Software process error - Interpolation Process
not allowed to run by higher priority processes.
9.1
“Quad Dec Not Init” HW: Quad Decoder failed Startup Sequence.
10.1 “Shutter Stat BAD” One or more shutters reading wrong status.
One other error may appear on the monitor screen with the statement “Assertion
Failed” (only if the PC is connected to Port A). This is a very rare but serious
error. If it occurs:
1. Copy the three lines that appear on the screen.
2. Note what occurred just prior to this failure.
3. Call Hughes-JVC at 1 800 392-9666. 
						

							Chapter 7---Troubleshooting
Model 250 Service Manual 7-25
7.5 Troubleshooting Guide
Table 7-3 lists some common projector problems, what to check when problems
occur, and offers possible solutions. It indicates the section in this Service Manual
that provides some related information on the problem. If the User’s Guide
contains pertinent information, the appropriate section will be given.
Table 7-3  Troubleshooting Guide
Problem Check Possible Solution Section
No Power Main Circuit Breaker on
Projector rear panel.Reset Circuit Breaker. Section 3.2
Main Circuit Breaker
fails when reset.Verify input power is
correct. Replace defective
Low Voltage Power
Supply or Arc Lamp
Power Supply.Section 3.2
Projector cover not
enabling interlock
switch?Reposition projector
cover.Section 6.1
No Picture Correct channel input &
VIC selected?Select correct channel
and VIC.User’s Guide
section 4.6
Arc Lamp turned off. Restart projector. User’s Guide 4.3.
System power turned off. Restart projector. User’s Guide 4.3.
Signal source Verify signal source is
turned on and properly
connected.User’s Guide 3.5.
HIDE command
invoked?Unhide image with the
HIDE key on the remote.
One color is missing. Turn on the missing color
with the HIDE key.
No image or raster on
one CRT.Replace defective CRT or
Video Amplifier Board.Section 6.9, 6.10
Arc Lamp Arc Lamp will not light.
Clicking noise is heard
when projector is turned
on.Replace worn out Arc
Lamp.Section 4.1
Clicking noise not
audible when projector is
turned on.LVPS, ALPS, or Ignitor
faulty. Replace LVPS,
ALPS, or Ignitor.Section 3.3, 3.4
Arc Lamp ignites but will
not stay lit.Replace defective Ignitor. Section 3.4 
						

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Model 250 Service Manual
Troubleshooting on the Backplane PCB
The connectors on the Backplane PCB provide one of the more accessible places
to probe voltages and signals that may be useful for troubleshooting purposes (see
Figure 7-18 and associated list of signals and voltages).
Figure 7-17  
Backplane Diagram (left side) 
						

							Chapter 7---Troubleshooting
Model 250 Service Manual 7-27
Figure 7-18  
Backplane Diagram (middle section)
The following is a list of pins that would be helpful for troubleshooting purposes.
Low Voltage Power Supply (J8) High Voltage Power Supply (J7)
Pin # Signal or Voltage Pin # Signal or Voltage
8 /LV_ENA 5 /HV_OK
9 /LV_OK 8 +80 V
10  +24 V_FANS 9 +15 V
11  _5.1 V Stdby 10 -15 V
12  +5.1 V 11 G1 SUPPLY
13 +6.2 V 12 /VA_OK
14 +15 V 1-4 GND
15 -15 V
16 +80 V
17 /COVER_ON
18 /FAN_ENA
1-7 GND
Arc Lamp Power Supply (9)
Pin # Signal or Voltage
2 /LAMP_LIT
3 /LAMP_OK
4 /LAMP_ENA
5 /COVER_ON
1, 6 GND 
						

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Model 250 Service Manual
Figure 7-19  
Backplane Diagram (right side) 
						

							Chapter 7---Troubleshooting
Model 250 Service Manual 7-29 
						

							Chapter 8---Software and Protocol
Model 250 Service Manual 8-1
8.0  Software and Protocol
Contents
8.1  Software Updating........................................................................................ 8-1
8.2  Importing/Exporting..................................................................................... 8-5
Configuration ............................................................................................. 8-5
Exporting .................................................................................................... 8-6
Importing .................................................................................................... 8-7
Null Modem Adapter ................................................................................. 8-9
8.3  Terminals and Communication Protocol...................................................... 8-10
Terminals.................................................................................................... 8-10
Terminal Preferences.................................................................................. 8-10
Communications Protocol .......................................................................... 8-11
8.1 Software Updating
The Model 250 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 (Windows 95/98 with Procomm Plus fax/modem software) 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.
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 (Terminal-In).
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.
!
 Under Terminal Preferences the following selections are appropriate;
Terminal Modes=Sound
!
 CR->CR/LF=Both off
!
 Columns=80 
						

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8-2 Model 250 Service Manual
!
 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.
6. Under Settings select Text Transfer=Standard Flow Control. Select OK.
7. 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 7-2) 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.
8. Turn the projector circuit breaker on while depressing and holding down
the service mode switch on the System Controller PCB (see Figure 7-1).
Verify that Boot Manager appears on the terminal monitor. The Power
On LED stays Red.
Alternate for Step 9: In Power Off Standby mode, Press Control, Shift
+ _ (underscore), hex IF (international keyboard may vary in key
placement).
9. 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: _
10. 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 12A to update the System Software.
11A. Enter the command loadboot at the prompt. You should see the
following output:
 Command: loadboot
 Boot Manager software update procedure 
						

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Model 250 Service Manual 8-3
 ***WARNING: IMPROPER USE MAY MAKE THIS SYSTEM 
UNBOOTABLE*** (This warning relates to the
Flash Memory  updating that occurs in Step
11D. Do not turn projector  power off while the
Flash Memory is updating)
 Memory buffer reset to 0xff
 Begin your S-Record upload now (Esc to abort).
 11B. From the Windows Terminal Menu (normally in Accessories window),
select Transfers/Send Text File, then select List Files of Type: All
Files, and select the disk and/or directory with the Model 250 software.
You should see a file named boot.hex. Select this file and press the OK
button to begin the upload. Uploading takes about 20 minutes (9600 bps).
 11C. During upload, a progress indicator updates the number of records
received. At the completion of the upload, the system will display the
following (numerical values are for example only and depend on the
Boot Manager version):
 S-Records processed: 823
 Upload Successful
 Address Range: 0x00000000-0x00006687
 Bytes Loaded:  26248
 ***WARNING: FLASH WILL NOW BE UPDATED***
 Press Enter to continue, Esc to abort.
 11D. The system has verified that the load module is correct and is ready to
update the Flash. Press Enter to perform the update (press Esc now to
abort the update with no changes). While the Flash memory is being
updated (15-30 seconds), DO NOT turn off the projector circuit breaker
or the machine could be made unbootable, requiring a new set of flash
chips to be installed. When the update is complete, the system will
display the following:
 Reprogramming Flash Sector 0 1
Boot Manager software update successful
 Command: _
The Boot software has been successfully updated. To restart the projector
under control of the updated boot manager, enter the reboot command
while depressing the service mode switch (see Figure 7-1). The projector
will now restart with the updated boot manager software.
NOTE:
 If normal software starts, see Step 9 to reenter Boot Manager.)
You should see the following displayed, where y.y.0 is the updated Boot
Managers version.