Wavetek 171 - Page 24

GENERATOR
LOOP
CHECK
YES
115/220V
SWITCH
& POWER
CONNECTION
QK>
<
<
ROTATE
DIAL
FROM TOP
TO BOTTOM
+15VTO~15 mV
SHIFT
AT E9
ROTATE DIAL;
0
VdcWITH
NO SHIFT
AT PIN
3
IC4
1
,
YES
DIAL
POTENTIO-
METER
BAD
%
ROTATE
DIAL;
APPROX
-15V
TO -10V SHIFT
AT
NO
PINS
7,4.
2&+15V'
X
TO +10V
SHIFT
AT
PINS
10
13 IC5?
^
YES
~±2
Vdc
AT
JUNCTION
&~+1.25
Vdc*
AT
JUNCTION
CR1
1,
127
YES
PROBLEM
>
—
IN
IC5
CIRCUIT
YES
CHECK
Q12-
15
>
CR15,
16
&
IC7
CIRCUIT
'The
top
or
bottom
of
the
square and
triangle
waveforms,
which
indicates
a
locked
up
generator.
Figure
6-2.
Generator
Mode Checks
(Sheet
2
of
3)
6-4