Table of Contents
Advertisement
Table
6-4.
Sine Conversion
1.
2
.
3.
4.
5.
6
.
Indication: Sine
waveform
problem.
Check
Set controls
to
initial
positions
(refer to
paragraph
6.4).
Check
emitter
Q1
for
a 4
kHz,
±
1
,25V
triangle.
Verify that the
±
1
.25V
triangle
peaks
at
the emitter
of
Q1
agree
within
3%
Select
triangle function;
check
for
±
1
,25V
triangle
at
U13
pin 10.
Select sine
function;
check
for
±
1.25V
sine
at
U13
pin
10.
If
Faulty,
Check
Check
for
normal
operation.
Go
to
table
6-2.
a.
R62, R63, R64, R65,
R67, R68,
R69 R70
b.
CR7, CRB,
U7.
c.
±
15V
supplies.
Go
to
table
6-3,
step
3.
a.
U12
circuitry.
b.
SW12.
Check
sine
distortion
500
OUT
(HI)
per
calibration
procedure
(refer to
table
5.1).
a.
R97,
R114
adjustments.
b.
Waveform
symmetry,
R45
adjustment
and
table
6-8.
c.
U12
circuitry.
7.
Check
sine
amplitude
vs
frequency per
specifications
(refer to
section
1
).
C47, C55, C56,
C57
Table
6-5.
Square
Function
Indication:
Square waveform
problem.
Check
If
Faulty,
Check
1.
Set controls
to
initial
positions
(refer to
paragraph
6.4).
Check
for
normal
operation.
2.
Check
CR10
cathode
for
a 4 kHz,
approximately
±2
V
square wave.
Go
to
table
6-2.
3.
Select
a
triangle function;
check
U13
pin
10
for
a
±
1
,25V
triangle.
Go
to table
6-3.
4.
Select
square
function;
check U1
3
pin
1
0
for
a
±1
.25V square.
a.
Q12,
Q13
circuitry.
b.
SW14.
5.
Check
square
wave
at
500
OUT
(HI) for
the
same
20V
p-p
(open
circuit)
amplitude as
the
triangle
and
sine.
R106, R110, R111.
6.
Check
rise/fall
times
of
4
MHz
square (500
terminated)
for
<50
ns.
C51
,
C55, C56, C57.
Table
6-6.
TTL Sync
Output
Indication:
TTL sync
output problem.
Check
If
Faulty,
Check
1
.
Set
controls
to
initial
positions
(refer to
paragraph
6.4).
Check
for
normal
operation.
2.
Check
U8
pin
1
for
a
TTL
level,
4
kHz
square.
Go
to
table
6-2.
3.
Check
U8
pin
8
for
a
TTL
level,
4
kHz
square.
a.
U8.
b.
CR1
1
,
CR12.
4.
Check
SYNC OUT
TTL.
E27, E28, El 9
wiring.
5.
Check
SYNC OUT
waveform
at
4
MHz,
using
a
TTL
load termination
or
a
>6000
resistive
termination
and
<3
foot
RG58U
coax.
a.
U8.
b.
El
9 ground connection.
6-4
Advertisement
Table of Contents
