HET UNLOCK

The RF Module Phase Lock Loop is unlocked. Items to check are:

nCAL OUTPUT

nA6A9 - Check voltage at A6A9J4.

nA6A4 - Check 3.3 GHz output of A6A4.

FREQUENCY

D I A G N O S T I C S B L O C K

TRACE

DETECT I ON

I N D I C A T I O N

A C T I V E

F U N C T I O N

BLOCK

S P E C I A L

MESSAGES

BLOCK

i/

I I

S T A R T 2 . 0 GHz

 

S T

O P

2 2 . 0 GHz

R E S BW 3 0 kHz

VBW 1 0 0 kHz

SWP 5

0 0

m s e c

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