Wavetek 171 - Page 32

REFERENCE
SELECTOR
CHECK
'SYNTH
LOOP DOES NOT WORK
WITH
EXTERNAL
REFERENCE
V
FREQUENCY
SOURCE
SYNTH LOOP
DOES
NOT
WORK
WITH INTERNAL REFERENCE
FREQUENCY
SOURCE
REF
SELECTOR
OK
CHECK SYNTH
LOOP
(SHEET
21
X
10
OR
GREATER
RANGE
&
SYNTH MODE
NO
/
12
\
LIT OVER
DIGITAL SW
\ ^
CHECK
IC1
&Q1.2
CLOCK CIRCUIT
ILLEGAL
OPERATION
CHECK
08,9
CLOCK KILL
CIRCUIT
SWITCHES
TO EXT
REF
\ /
1 MHz
EXT
REF
SIGNAL.
>1 VRMSSINE,
SQUARE
OR
.
TTL
^'Y'nO
1 MHz
TTL SIGNAL^
AT PINS
4,
5 IC6^
CHECK
IC6-8
CIRCUIT
ILLEGAL
OPERATION
CHECK
Q3,4
CIRCUIT
SELECTOR
FUNCTIONAL
BUT NO
SIGNAL"
.
AT "REF
OUT"
,
BNC
PROBLEM IN IC1
OR. IF
TTL BUFFER
OPTION
INSTALLED,
IC33
Figure
6-4.
Synthesizer Mode Checks
(Sheet
6
of
6)
6-12