HET UNLOCK
The RF Module Phase Lock Loop is unlocked. Items to check are:
n CAL OUTPUT
n A6A9
-
Check voltage at
A6A9J4.
n A6A4
-
Check 3.3 GHz output of A6A4.
FREQUENCY
DIAGNOSTICS BLOCK
TRACE
DETECT I ON
INDICATION
ACTIVE
FUNCTION
BLOCK
i/
SPECIAL
MESSAGES
BLOCK
I
I
START 2.0
GHz
STOP 22.0
GHz
RES BW 30
kHz
VBW
100
kHz
SWP
500
msec
Figure 1. CRT Locations of Special Messages and Diagnostic Function Indicators
Diagnostic Functions
The Diagnostic Functions are accessible through the blue
lsHlFTJ
key on the front panel.
Through their use it is possible to trace many instrument malfunctions back to the functional
block without removing any assemblies. They are also used in Performance Tests and
Adjustments as an aid in performing necessary adjustments. A summary of the Diagnostic
Functions follows. More information on their use can be found in the troubleshooting
procedures.
6 Overall Troubleshooting