Chapter 2 59
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
6. Referring to Figure 2-6, verify that the +12D VDC power supply is on.
Figure 2-6 A6 Midplane Board +12D LED
Is the +12D backlight supply voltage LED on?
If yes:
Proceed to step 7.
If no:
Replace the A5 Power Supply assembly.
7. With the instrument turned off remove the 8 screws that attach the front panel
assembly to the instrument chassis.
8. Without disconnecting any of the cables carefully lay the front panel assembly
face down on the work surface.
9. Referring to Figure 2-7, verify the 3 voltage levels listed in Table 2-1 are
correct.
NOTE The instrument does have a screen saver which can disable the display backlight
after a predefined period of time. If there is any question as to whether or not this
has been set by the user prior to the current failure, and the “Inverter Enable”
voltage measures too low, press a front panel key and see if the voltage level
increases to the expected level.
A9, L.O. Board
plugs into J21
A5, Power Supply plugs
into J101 and J102
A3, CPU Assembly plugs into
J201, J202, J203 and J204
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