Table of Contents
Advertisement
[5] ENCODER CHECK
Turn the encoder clockwise.
When the knob is fully turned until the meter displayed on the LCD reaches
MAX, "OK" is displayed.
Then, turn it counterclockwise.
When the system confirms that the meters have fully flilled in both directions,
it automatically proceeds to the next test.
[6] LCD CHECK
Confirm that the contrast becomes lighter when the encoder is turned
counterclockwise.
Confirm that the contrast becomes darker when the encoder is turned
clockwise.
Confirm that all displays go off when the [CURSOR R] key is pressed.
Pressing the [CURSOR R] key displays the entire screen in black.
Confirm that all dots function and that they are even.
If there is no anomaly, press the [CURSOR R] key and proceed to the next test.
[7] LINE IN CHECK
Connect a noise meter to the LINE OUT jack and measure the noise level.
Turn both [VOLUME] and [REC LEVEL] knobs to MAX.
L/R -65dBm or below (IHF-A)
Connect a monitor speaker (MA-10A, etc.) to the LINE OUT jack, and confirm
that there is no poor contact when the [VOLUME] and [REC LEVEL] knobs are
turned right and left.
Connect an oscilloscope to the LINE OUT jack so that the output waveform
can be observed.
Turn both [VOLUME] and [REC LEVEL] knobs to 'MAX'.
Connect an osclllator to the LINE IN jack and input a 200Hz, 150mVp-p square
wave, then confirm that there is no anomaly in the waveform displayed.
Confirm that the waveform changes smoothly when the [VOLUME] and [REC
LEVEL] knobs are turned.
fig.test-line1
If there is no anomaly, press the [CURSOR R] key and proceed to the next test.
[8] PHONES CHECK
Connect an oscilloscope to the PHONES jack so that the output waveform can
be observed.
Turn both [VOLUME] and [REC LEVEL] knobs to 'MAX'.
Connect an oscillator to the LINE IN jack and input a 200Hz, 150mVp-p square
wave, then confirm that there is no anomaly in the waveform displayed.
fig.test-phone1
If there is no anomaly, press the [CURSOR R] key and proceed to the next test.
[9] MIC CHECK
Connect an oscilloscope to the LINE OUT jack so that the output waveform
can be observed.
Turn the [VOLUME] knob to 'MAX' and the [REC LEVEL] to the center.
Connect an oscillator to the MIC jack and input a 200Hz, 100mVp-p square
wave, then confirm that there is no anomaly in the waveform displayed.
fig.test-mic1
Input
If there is no anomaly, press the [CURSOR R] key and proceed to the next test.
[10] DIGITAL IN CHECK
Output
It takes awhile for the system to recognize the digital signal for this test.
"Awaiting Digital Signal..." is displayed until the signal is recognized.
So after connecting digital equipment, wait for awhile.
SP-505
Input
Output
Input
Output
19
Advertisement
Table of Contents
