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Dec. 2009
Test Mode
Items Required
• Signal generator
• Oscilloscope
• Noise meter (e.g., NF M2177)
• Tester
• 47-kΩ dummy plug x 1
• Amp-equipped monitor speaker
• Computer (running Windows XP)
• WAV data (the following three files—obtained via Service Net)
1C0_JUST.WAV
2A4_JUST.WAV
3C8_just.WAV
Preliminary Preparations
1.
Connect the respective pieces of equipment as shown below.
fig.test-jyunbi-e.eps
2.
On the computer, use Windows Media Player to play 2A4_JUST.WAV, and adjust the output level so that the noise meter
displays a value of -60 dBu.
Entering the Test Mode
1.
Referring to the figure below, connect the equipment at all points except the INPUT jack.
fig.test-Connect-e.eps
Oscilloscope
Noise Meter
(DIN-AUDIO)
2.
Hold down the MODE and STREAM/CENT buttons and insert the plug into the INPUT jack.
Quitting the Test Mode
Disconnect the plug from the INPUT jack.
* Because disconnecting the plug from the INPUT jack while testing is in progress switches off the power, interposing a switching tool
between the INPUT jack and the plug can facilitate operations.
Attenuator
tool
Monitor Amp (CM-30)
* Switch as required
by testing.
* Switch as required by testing.
• Attenuator tool x 1
fig.test-Attenuator-e.eps
Attenuator-tool circuit diagram
PSA
Voltmeter
Ammeter
Oscillator
* Switch as required
by testing.
47k
Attenuator
Short Plug
tool
(-50 dB)
TU-3
200Hz
1Vp-p
Square
1KHz
0dBu
Sine
9
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