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
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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