Wavetek 188 Instruction Manual page 36

Indica tion: Problem
f requency (2.0
9. Check 400 Hz
frequency (2.0
1 0. Check 40 Hz
Check frequency (4.0 X ' )
1 1 .
4 Hz
, 2. Check symmetry at 0 . 2
Indica tion: Generator trigger and gate mode problems.
Set i nitial positions (refer
1 . cont rols to
If
generator operates
2.
3. Check for OV at U9 pins 2 and 5.
a
4 . Check for TTL low at U 1 0 pin 1
SV U l0
Check for at
5.
+
Check for approximately
6.
uous mode ope ration.
pin
Check that U6
7.
4
as dial is rotated from 4
1 SV
-
a. Go to gated mode (CONT dep ressed. TRIG/GA T E
for TTL high.
a
6-8
Table 8-9. C apJIcltancl
bottom frequency ranges
on
Check
1 00).
x
1 0).
x
.
1 00; ensu re
t riang l e is l i nea r.
x
Table
8- 1 0. Trigger Logic
Check
pa ragraph
to
normally
in conti nuous mode . go to step 7.
0.
pin 9.
3.5V at anode CR6.
+
a nd U6. pin 1 5 va ry from approximately
to .00 4 .
.0
Scans by ArtekMedia
Multiplier (Contlnu.d)
only.
6.4).
Check for normal contin­
1 0V to
-
re l eased).
Check U9 pin
2
201 1
=>
Procedure
Corrective
adjustment.
Ra6
a.
b. Ra9. R95. C45.
R93 . SW3.
R94 .
adjustment.
a . R90
b. Leaky C30, U 1 t . C36, C45.
c. C46,
CR6, US, 09.
It Faulty. Check
Check
for norma l con tinuous
operation.
SW9 .
U9, 5V supply.
+
U 1 0.
a .
CRS. CR1 S, 08.
b.
c. US.
CRS, to US. oa.
a .
b. Go table 6-2.
l
a. U6. RS2. R53.
b. Go tab 6-7 .
to
e
a. U 1 0.
5V supp l y.
b.
+
SW9, SW1 1 .