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Table
6-5.
Square Function
Indication:
Square
t,
avelorm problem
t.
Check
Sei controls
to
initial
positions
(refer to
paragraph
6
4)
Corrective
Procedure
Check
tor
normal
operation
2
Check
CRiO
cathode
tor
a 4 kHz. approximately
s 2V
square
wave
3
Select a
triangle function,
check U1
3
pin
10
for
a
si
25V
triangle.
4.
Select
square
function,
check
U1
3
pm
10
for
a
*
125V
square
Go
to table
6-2
Go
to table
6-3.
a.
012.
013
circuitry,
b
SW14
5,
Check
square
wave
at
500
OUT
(HI)
for
the
same 20V
pp
(open
circuit)
R106.
Ri
10.
Ri
1
amplitude
as
the
triangle
and
sme
6
Check
rise'fali
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
Corrective
Procedure
1.
Set controls
to
initial
positions
(refer to
paragraph
6
4)
Check
lor
normal
operation.
2
Check
U0
pm
1
for
a
TTL
level.
4
kHz
squaro
Go
lo
table
6-2
3
Check
U8
pm
8
for
a
TTL
level.
4
kHz
square
a
U8
b
CR11.CR12
4
Check
SYNC OUT
TTL
E27. E28.
E19
wiring
5
Check
SYNC OUT
wavefo'm
at
4
MHz.
usmg
a
TTL
load termination
or
a
£6000
resistive
termination
and
s3
foot
RG58U
coax
a
U8
b E19
ground
connection.
6-5
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