Specifications
Table Of Contents
- General Information
- Preparing for Use
- To inspect package contents
- To connect power
- To connect the mouse, keyboard, LAN, printer, and GPIB cable
- To connect the standard 10073C probes
- To connect optional InfiniiMax oscilloscope probes
- To connect the digital probe
- Digital probe lead set
- To tilt the oscilloscope upward for easier viewing
- To turn on the oscilloscope
- To turn off the oscilloscope
- To verify basic oscilloscope operation
- Installing application programs on Infiniium
- Changing Windows System Settings
- To clean the oscilloscope
- Testing Performance
- Calibrating and Adjusting
- Troubleshooting
- To install the fan safety shield
- To troubleshoot the oscilloscope
- Primary Trouble Isolation
- No Display Trouble Isolation
- To check the backlight inverter voltages
- To check the display board video signals
- Power Supply Trouble Isolation
- To check probe power outputs
- To Check the keyboard
- To check the LEDs
- To check the motherboard, CPU, and RAM
- To setup the BIOS
- To troubleshoot the acquisition system
- Software Revisions
- Replacing Assemblies
- To return the oscilloscope to Agilent Technologies for service
- To remove and replace the top cover
- To remove and replace the bottom sleeve
- To disconnect and connect Mylar flex cables
- To remove and replace the CD-ROM drive
- To remove and replace the AutoProbe assembly
- To remove and replace the internal digital input cable (MSO models only)
- To remove and replace the backlight inverter board
- To remove and replace the front panel assembly
- To remove and replace the keyboard, touch screen, and flat-panel display assemblies
- To remove and replace the acquisition board assembly
- To remove and replace the PCI bridge board
- To remove and replace the display board
- To remove and replace the hard disk drive
- To remove and replace the motherboard
- To replace the Intel motherboard with the ADLINK motherboard
- To remove and replace the power supply
- To remove and replace the fan controller board
- To remove and replace a fan
- To remove and replace the probe power and control assembly
- Replaceable Parts
- Theory of Operation
- Index
Chapter 5: Troubleshooting
To check the backlight inverter voltages
81
To check the backlight inverter voltages
The backlight inverter board A5 is located in the front-left corner of the oscilloscope (as you face
the front panel).
• There is an input connector at one side of the board.
• There are two output connectors on the other end of the board, that power the two backlights
which are inserted into the flat panel display.
The output voltage is approximately 300-450 V
rms
, 40 kHz (measured differentially between the
two wires) when the backlight is illuminated. The voltage is approximately 1 kV before the
backlight tube is illuminated. A red LED on the backlight inverter board illuminates when the
output voltage is present.
When the backlight goes off (when the oscilloscope’s operating system switches to screen saver
mode) the voltage on pins 1 and 2 (with respect to ground) slowly decays to 0 V.
The outputs are controlled by the input. Notice that input pin 5 goes low to enable the output
voltage. These pins can be reached at J1 on the display board A11 on systems that use the Intel
motherboard, or on connector CN10 on systems that use the ADLINK motherboard.
Table 5-5
Backlight Inverter Board Input Voltages
Input Pin # 7 65432 1
Backlight OFF 0 V 0 V 0 V 0 V 0 V 0 V 0 V
Backlight ON 5 V 0 V 2.5 V 0 V 0 V 12 V 12 V