Wavetek 171 - Page 24

GENERATOR
LOOP
CHECK
N0±1.25V
'\/
ATPIN
6
IC6
~
REGULATED
NO
115/220V
SWITCH YES
<
+&-15Vdc
~
&POWER
~
AT
TP2 & TP3
CONNECTION
?
Q!S}
YES
ROTATE
DIAL
FROM TOP
TO
BOTTOM
(
+15V
T0"""15
mV
SHIFT
AT
E9
?
Jves
ROTATE
DIAL;
<
OVdcWITH
NO
SHIFT
AT
PIN
3
IC4
7
'j;YES
ROTAT\
DIAL;
APPROX
-15V
T0-10V
SHIFT
AT
<PINS
7,4,
2
&
+15V
TO
+10V
SHIFT
AT
PINS
10
13
IC5?
l.
YES
"'±2
Vdc
AT
JUNCTION
<
CR9,
10
&
-+1.25
Vdc*
AT
JUNCTION
CR11
12
7
-~de
ON C24 (+)
&"""-24
Vdc
ONC23
(-)
?
DIAL
POTENTIO-
METER
BAD
PROBLEM
IN
IC4
CIRCUIT
PROBLEM
IN IC5
CIRCUIT
CHECK
CR13, 14
CHECK
POWER SUPPLY
~--
REGULATOR
(FIGURE
6-3)
CHECK
012
-
15
>----...
CR15,
16
&
IC7
CIRCUIT
CHECK
XFMR
CHECK
012
- 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