Wavetek 75 - Waveform Synthesizer Troubleshooting; Waveform Synthesizer Functional Check

Table 6-13. Waveform Synthesizer Troubleshooting
Fault
No waveform out, amplitude
out of tolerance, or offset
out of tolerance.
Waveform output erratic,
not at programmed points.
Setup
Check
I
Results Desired
Reset.
Set stop address to
0000. Adjust
"Y" value
to - 2047.
Reset.
Select square function.
U2-13.
U2-14 thru
-24.
U
6-6.
Verify waveforms and voltages as
shown in table 6-1 4.
A
TTL high.
All are low.
Approximately
- 2.5V.
Slowly adjust "Y" value
to
+ 2047. Voltage should smoothly increase
to
+ 2.5V.
Sum In not functioning
properly.
Reset.
Erase current waveform.
Apply +5V to "Sum In"
connector. Junction of
R34 and
F1
U7-6.
Verify
+ 5V.
Verify
+ 2.OV.
Table 6-14. Waveform Synthesizer Functional Check
Test Point
U2 pin 4
U2 pins 14 thru
Desired Results
+10V k0.1 Vdc
y2 rnsT
24
U6 pin 6
I
HIGH ----
LOW - - - - - - --
U2 pin 13
A high logic level
Scans by ArtekMedia O 2006
u7 pin 6
r2rns~