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Indication: Generator trigger and gate mode problems.
1.
Set controls to initial positions (refer to paragraph 6 .4).
2.
If generator operates normally in continuous mode, go to step 7.
Check for OV at U9 pins 2 and 5.
3.
4.
Check for a TIL low at U 10 pin 10.
5.
Check for + 5V at U1 0 pin 9.
6.
Check for approximately + 3.5V at anode CR6. Check for normal contin
uous mode operation.
7.
Check that U6 pin 4 and U6 pin 15 vary from approximately - 10V to
- 15V as dial is rotated from 4.0 to .004.
Go to gated mode (CONT depressed, TRIG/GATE released). Check U9 pin 2
8.
for a TIL high.
9.
Check U9 pin 1 for a TIL high.
10.
Check U10 pin 10 for a TIL high.
11.
Check U1 0 pin 9 for TIL low.
12.
Check anode CR6 for approximately - 1.5V.
13.
Check cathode CR6 for approximately -0.7V.
14.
Check emitter 011 for 0 Vdc
15.
Connect an external TIL signal to TRIG I N connector; check for the inverse
of that signal at U 10 pin 10.
16.
Press TRIG/GATE switch and check for an approximate 20 ns negative
pulse at U 10 pin 10 following the low-to-high transition of the external
signal (increasing the frequency of the external generator makes this
pulse more visible).
17.
Remove the external signal and verify that U1 0 pin 5 goes from high to low
when the MAN TR!G switch is held depressed.
18.
Release the TRIG/GATE switch (gated) and check that U10 pin 10 goes
from high to low when the MAN TRIG switch is pressed.
19.
Monitor 50n OUT, triangle function, for 0 Vdc baseline.
Table 6·10. Trigger Logic
Check
±
100 mY.
If Faulty, Check
Check for normal continuous
operation.
SW9.
U9, + 5V supply.
a. U10.
b. CR6, CR 15, 08.
c. U6.
a. CR6, U6, 08.
b. Go to table 6-2.
a. U6, R52, R53.
b. Go to table 6-7.
a. U10.
b. SW9, SW11, + 5V supply.
a. U9.
b. R73, - 5V supply.
a. U9.
b. U10.
a. U 10.
b. 08.
a. CR15, 08, R78.
b. CR6.
a. U5.
b. U6.
a. R81 adjustment.
b. 09 - 011 circuitry.
a. E25, E26.
b. CR13, CR14.
c. U9, SW10.
a. U9, SW10.
b. C29.
a. SW11.
b. U10.
SW9.
R81, R112 adjustments.
a. U10 or clock signal to U10
from U7
b. C29 (pulse too narrow)
6-7
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