Wavetek 171 - Page 29

CONTINUED
FROM
SHEET2
SYNTHESIZER
LOOP
CHECK
(CONTINUED)
-+2.sv
AT0.1000
YES LOOP
RUNNING
<
&-+12V
AT
1.9999
,__
____
CHECK
FREQUENCY
Dl'GITAL
SWITCH SETTI
RANGING
AT
PIN 6
IC10
(SHEET 4)
?
NO
LOOP
LOCKED
UP
CHECK
IC9,
10
CIRCUIT
CHECK
IC23,24
CHECK
IC23,
24
REPLACE
IC28
REPLACE
IC32
NO
CHECK
IC11,
12
CIRCUIT
REPLACE
IC29
CHECK
IC13
& VR1
CIRCUITS
NOTE FREQUENCY
{F)
FOR
FOLLOWING
CHECKS
SET
DIGITAL
SWITCH
TO 1.9999
REPLACE
IC30
CHECK
IC22,26,27
Figure
6-4.
~ynthesizer
Mode
Checks (Sheet 3
of
6)
YES
SET
DIGITAL
SWITCH
0.4000
0.2000
0.1000
SET
DIGITAL
SWITCH
TO 0.8000
VERIFY
ATPIN6
IC24
(FREQUENCY)
1/2
F
1/4
F
1/8
F
REPLACE
IC31
6·9