Technical data

LEDs continue to blink, or remain lit, this is an indication of a problem.
5-2 Troubleshooting
LEIk will blink on momentarily as the analyzer activates and checks the
module If the
ERR (error)
tnmed on, the ACT (Active)
and
each time the analyzer is
70903A IF Section Service Manual for alignment procedures.
Module Self-Test
During module self-test, which occurs
HP
It is possible that a module may dismpt all HP-MSIB communication without
its own error indicator flashing.
Caution
Do
not remove the module side covers. A complete electrical alignment
of the module is required when the side covers are removed. Refer to the
System master.
n Some errors may only be present when the spectrum analyzer sweeps; this causes the
error indicator to flash at the sweep rate.
Note
has keyboard control of the
display.
n The instrument is in self-test mode.
Refer to the installation and verification manual for the system master for additional detail
related to ACT LED.
STATUS ERR
The module error indicator, the ERR LED, indicates that the module has an error condition.
If the module is a slave, then the error light of both the slave and its master will indicate the
error condition.
l The ERR LED flashes at a 1 Hz rate when communication over HP-MSIB is not
satisfactorily completed.
n If the error indicator LED of more than one of the spectrum analyzer ’s modules flash
at a 1 Hz rate simultaneously, refer to the installation and verification manual of the
STATUS ACT
Note
The ACT LED of a slave module is only operative when there is a display in
the system or when the instrument is performing a self-test.
The ACT LED of a slave module turns on when:
n The module is performing a function directed by manual control of the display
keyboard.
n The module is making a measurement and its master