Fluke 6080A - Page 132

TROUBLESHOOTING AND REPAIR
FREQUENCY SYNTHESIS
6C-2
Figure 6C-1. Frequency Synthesis Fault Tree
IF
302,
TRY
SPCL
04,
THEN CODES:
402-403
405-407
411 422-423 425-427
431
IMPLY
A
LATCH
PROBLEM
OR
CAL/COMP
MEMORY PROBLEM
RELATING
TO
FREQUENCY
FM
BOARD
247
MEASURE
80 MHz
(OUT)
TO SUM
LOOP
PCA
SEC.
6E
SUM
LOOP
AND
SUM
LOOP
VCO
244
245 327-333
MEASURE
16-32
MHz
(IN)
540-980
MHz
(IN)
80 MHz (FM
PCA)
PARA. 6C-28 THRU 6C-40
COARSE LOOP
AND
COARSE LOOP
VCO
243
246 320-323
MEASURE
540-980
MHz
(OUT)
80 MHz
(OUT)
10 MHZ REF
(OUT)
PARA.
6C-13
THRU 6C-27
SUB-SYNTHESIZER
AND
SUB-SYNTHESIZER
VCO
242 246
324-326
MEASURE
16-32
MHz
(OUT)
PARA.
6C-3
THRU
6C-12
EXACT FREQUENCIES
CAN BE
FOUND
BY:
SPCL
945 -
SUM
LOOP FREQUENCY
SPLC
946 -
COARSE LOOP FREQUENCY
SPCL
947
-
SUB-SYNTHESIZER FREQUENCY