Audio Section Partial Tests; Scaf Variable Low Pass Filter; Figure 35. General Location Of The Scaf Circuit; Figure 36. Close Up Component View Of The Scaf Section Of The Board - NORCAL NC2030 Manual

Audio Section Partial Tests

Apply the 9v battery voltage. Check voltage across C107 to makes sure it has 2.9v.
Check the voltage across C111 for ~ 1.5v. This should be biased to half of the 2.9v supply voltage.
Check the voltage from either end of R78 to ground. It should also be ~ 1.5v.
Disconnect the 9v battery supply.
This section will be tested further after the SCAF and CW Keyer sections are finished.

SCAF Variable Low Pass Filter

Figure 35. General location of the SCAF circuit

Figure 36. Close up component view of the SCAF section of the board.

Norcal NC2030 v5 12-18-05
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