Checking A7 Cpu Red Led Patterns (F'or Instruments With Ilrmware Revisions 7.Xx And Above.) - Agilent Technologies HP 8719D Service Manual

Checking A7 CPU Red LED Patterns
(For instruments with firmware revisions 7.~3~ and above.)
The A7 CPU has five red LEDs that can be viewed through a small opening in
the rear panel of the analyzer. (See Figure 6-6.) Four LEDs are easily viewable.
The fifth LED must be viewed by looking to the left at an angle.
1. Cycle the power while observing five red LEDs
Cycle the power on the analyzer and observe the five red LEDs. After an
initial pattern, the five red LEDs on the A7 CPU board should remain off.
If the LEDs remained off, then proceed to the assembly that you suspect
n
has a problem.
If the LEDs did not remain off, switch off the power and remove the
n
bottom cover for further troubleshooting.
Figure 6-6. CPU LED Window on Rear Panel
2. Cycle the power while observing all eight red LEDs
With the analyzer positioned bottom up, cycle the power and observe the
eight red LEDs while looking from the front of the instrument.