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Use
the
following table to check various circuit
proper level.
Table 6-l:
NOTE:
Voltage measurements with DAC value of 0, 1 kHz Frequency
and Tone Steady.
Measurement Location
Junction R314 & R316 (R Side) - Osc. out
U303 3 Pin 15 - DAC Voltage Reference
U303 3 Pins 4 thru 11
U302 2 Pin 7
U300 0 Pin 7
U300 0 Pin 1
Junction R313 & R311 (R Side) -3.4 Vdc
10 dB Range Extender Check
U300 0 Pin 1
DAC =
DAC = 10
* Sine Wave should have "clipping" evident on negative and
positive slopes.
decrease output level and eliminate clipping.
ATTENUATOR CIRCUIT TEST CHECK
Tone OFF
+5 5 Vdc
-3.4 Vdc
+ .5 Vdc
0 VRMS
Pad OUT
1.2 VRMS
0
.7 VRMS
Increasing DAC value to 5, 6, or 7 should
51
voltages
for
Expected Voltaqe
.2 VRMS
3.35 Vdc
0 Vdc
0 Vdc
-.15 5 Vdc
1.2 VRMS
0 Vdc
Pad In
* 3.5 VRMS
2.1 VRMS
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Troubleshooting
