73
TEST PROCEDURES
• Remove the six screws that secure the I/O - DSP PCB to the enclosure. Disconnect the
10-pin wiring harness at J3. This will remove the I/O -DSP output and allow you to perform
the following tests. Leave the other wiring harnesses connected. The I/O - DSP PCB uses
the +/- 18VDC output from the SMPS/Amplifier PCB to operate.
Input 1 and 2 Tests
The below tests use Input 1 driven with a balanced differential signal and its volume control set
to MAXIMUM (fully CW) and the Mic/Line Level switch set to the MIC position.
The Line Output XLR jack is used for all readings. The EQ switch is set to the FULL RANGE
position. Input 2 volume control is set to MINIMUM (fully CCW).
2. Input 1 Gain Test
2.1 Input 1 to Line Output balanced. Set the Signal Input switch to the MIC setting. Set the Input
1 volume control to MAXIMUM (fully CW).
2.2 Apply a 1KHz, -30dBu signal to the Input 1 XLR connector.
2.3 Measure the output level at the Line Output XLR connector. It should be +6.0dBu, +/- 2dB.
2.4 Set the Signal Input switch to the LINE position. Measure the output level at the Line Output
XLR connector. It should be -15.0dBu, +/- 2dB.
3. Input 1 LED Test
3.1 Set the Input 1 Signal Input switch to the LINE position. Set the Input 1 volume control to
MAXIMUM (fully CW). Set the Front LED switch to the POWER position.
3.2 Apply a 1KHz, -48dBu signal to the Input 1 XLR connector.
3.3 Verify that the Input 1 Signal/Clip LED lights GREEN.
3.4 Measure the output level at the Line Output XLR connector. It should be -33dBu to 13dBu,
+/-1dB.
3.5 Apply a 1KHz, +1dBu signal to the Input 1 XLR connector.
3.6 Verify that the Input 1 Signal/Clip LED lights RED.
3.7 Measure the output level at the Line Output XLR connector. It should be >16dBu, +/-1dB.
3.8 Verify that the Front LED switch is set to the POWER position. Verify that the Front LED is
lit BLUE.
3.9 Move the Front LED switch to the LIMIT position. After about 3 seconds, it should get brighter
and a little wider to indicate that the input limit has been reached. Remove the input signal. Verify
that the Front LED returns to the same intensity as when the switch is in the POWER position.
To Next Page
Loading...
Need help?
General
