AI-LCD220-01-x Installation Manual
Document # 540231, Rev D, 05/2005
Page 14 of 18
4.3 General Troubleshooting Procedures
•
Verify power to the unit by rech28 VDC power is applied to the
proper pins on the unit. Use a voltmeter to verify correct level.
•
Remove power from the unit for at least one (1) minute and reapply
power.
•
Recheck all connections to the unit for security. Check all harness
runs for possible pinching. Recheck all pinouts for application
accuracy.
•
Check data bus integrity by utilizing a voltmeter, oscilloscope, or other
voltage instrument to verify proper input voltage on the data bus pins.
Typical measurements are as follows:
A to Ground: 4.0 to 4.5 VDC
B to Ground: 0.1 to 1.0 VDC
If any device is transmitting (i.e., holding bus active), then these typical
measurements would be reversed for the A-to-Ground and B-to-
Ground. This troubleshooting tool can help indicate a data bus lockup.
If this occurs, remove the data bus from all other equipment one piece
at a time. As each is removed, check the bus status to see if it is now
functioning properly. Once you have removed the piece or pieces of
offending equipment, disconnect power and then reconnect everything
but the suspect component. Reapply power and then test the
functionality of the unit(s).
4.4 Troubleshooting Chart
Problem Possible
Cause Solution
Poor picture quality or
scrambled video
LCD backlight malfunction
SP-LCD4 programming
Poor video source
•
Contact AI
•
Check setup
•
Change cassette
Blank screen*
LCD not receiving power
Mother board malfunctioning
•
Check all cable
connections
•
Contact AI
*The monitor displays a blue screen with the unit turned on and no video
signal.
