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Indication: Generator trigger and gate mode
9.
Check U 9 pi n 1 for
a
1 0
1 0.
Check U 1 0 pi n
for
1 1 .
Check U 1 0 pin 9 for TTL low.
1 2 .
Check anode CR6 for approx i mately - 1 . 5V.
1 3.
Check cathode CR6 for
Check
1 4 .
em itte r 01 1 for 0 Vdc
Connect
1 5.
an
external
of that
at U 1 0
signal
16.
Press
TRIG/GATE swi tc h and c heck for
pulse at U 1 0 pin 1 0 following
the frequency
s i g n a l (i ncreasing
pulse
m ore
visible).
1 7 .
Remove the external
when the MAN TRIG swi tch is held depressed .
the TR IG/GATE
Release
high
1 8 .
from
to low when the MAN TRIG switch is pressed .
triangle
Monitor 500 OUT.
1
9.
MAN TR I G
20.
Press
switch
switc h is
while the
held.
cycle output each time the MAN TR IG switch is
a
single
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Trigger Logic (Continued)
Table 8·1 0.
Check
TIL high.
TTL h i g h .
a
0.7V.
approximately
-
1 00 mY.
±
TIL signal to TR IG I N connec t or; c h eck for the
pin 1 0.
approx i mate 20
a n
of
t ransition of the
the low-te-h i g h
the exte rnal generator makes thi s
verify
and
that U 1 0
s i g na l
(gated)
swi tc h
and check that U 1 0
function. for 0 Vdc
check Soo O UT for a continuous triangle
and
Dep ress TR IG/GATE swi tch
2011
=>
problems,
inve rse
ns
negative
ex t e rn a l
pin
S goes f rom hig h to
l ow
1 0 goes
pin
basel
ine.
verify
and
(trigge red)
depressed.
Correct Iv. Procedure
a .
U9.
supply.
b. R73,
5V
-
U9.
a .
b. U l 0.
U l 0.
a.
b.
08.
C R 1 S. 08.
R78.
a .
b. C R6�
a. U S .
b. U6.
adjustment.
R81
a.
b. 09
a l l circuitry.
-
E25. E26.
a .
b. CR 1 3, CR1 4.
U 9 , SW1 0.
c .
U 9 . SW1 0.
a .
b. C29 .
SW1 1 .
a.
b. U l 0.
SW9.
adjustments.
A 8 1 . A 1 1 2
U l 0
signal to U l 0
a
.
or
c lock
from
(pulse
na rrow).
U 7 .
b. C29
too
6-9
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