HP 16600A Series User Manual page 252

Analyzer won't power up
If logic analyzer power is cycled when the logic analyzer is connected
to a target system or emulation probe that remains powered up, the
logic analyzer may not be able to power up. Some logic analyzers are
inhibited from powering up when they are connected to a target system
or emulation probe that is already powered up.
❏ Remove power from the target system, then disconnect all logic analyzer
cabling from the analysis probe. This will allow the logic analyzer to power
up. Reconnect logic analyzer cabling after power up.
Solutions for CPU32
Chapter 12: Troubleshooting the Analysis Probe
Logic Analyzer Problems
251