Agilent Technologies HP 8719D Service Manual page 206

Note
If firmware did not load, a red LED on the CPU board will be
flashing. Refer to "Loading Firmware" in Chapter 3.
3. Evaluate results
If either of the following LED patterns remain, go to "Display
q
Troubleshooting. '
If any other LED patterns remain, replace the A7 CPU after verifying the
q
power supply.
l l 0
l
0 l
(front of instrument J.)
l l 0
0 l
Digital Control Troubleshooting