30
Test Procedures
Required Equipment
1. Tera Term terminal emulator - download at http://
sourceforge.jp/projects/ttssh2/
2. TAP cable 264565 ( used for TAP commands)
3. RS232-TTL Converter - B&B electronics Model
232LPTTL or similar - http://bb-elec.com
4. An A/D converter and audio generator
5. Computer setup to issue TAP commands - see
page 29 for instructions.
1. Air Leak and Bass Control Test
1.1 Apply a 70 Hz, 50 mVrms signal to the left and
right input of the A/D converter.
1.2 Connect the A/D converter Coax output to the
unit’s Coax input.
1.3 Issue TAP command “remote o” to turn the unit
on, or press the remote ON button.
1.4 Issue TAP command “VO 100” to set the volume
to maximum level.
1.5 Adjust the bass control to the center position.
1.6 Listen for any air leaks from sealed enclosures
such as the top cover and drivers.
1.7 Rotate the bass knob to the full minus position
and then to the full plus position. You should notice
a corresponding decrease and increase in bass.
2. Buzz and Sweep Test
2.1 Apply a 35 Hz, 25mVrms signal to the left and
right input of the A/D converter.
2.2 Connect the A/D converter Coax output to the
unit’s Coax input.
2.3 Issue the TAP command “remote 0” to turn the
unit on, or press the remote ON button.
2.4 Issue the TAP command “VO 100” to set the
volume to maximum level.
2.5 Sweep the generator from 35 Hz to 3 kHz.
2.6 Listen for buzz, rub, or extraneous sounds.
Localize and repair any buzz. Replace any trans-
ducer that rubs or produces extraneous sounds.
3. Left, Right, Center Output Test
3.1 Connect the A/D converter Coax output to the
unit’s Coax input.
3.2 Apply a 1 kHz, 10mVrms signal to the left input
of the A/D converter.
3.3 Listen for clean, undistorted audio from the left
speaker.
3.4 Apply the signal to the right input of the A/D
converter.
3.6 Lister for clean, undistorted audio from the right
speaker.
3.7 Apply the signal to the right and left input of the
A/d converter.
3.8 Listen for clean, undistored audio from the three
center speakers.
4. Input Test
Note: Connect only the input being tested to avoid
triggering the auto select circuit.
4.1 Issue the TAP command “remote 0” to turn the
unit on, or press the remote on button.
4.2 Issue the TAP command “VO 100” to set the
volume to maximum.
4.3 Apply a 200 Hz, 25 mVrms signal to the unit’s
left and right analog RCA input.
4.4 Listen for clean, undistorted audio from the unit.
4.5 Apply a 200 Hz, 25 mVrms signal to the left and
right input of the A/D converter.
4.6 Connect the A/D converter Coax output to the
unit’s Coax input.
4.7 Listen for clean, undistorted audio from the unit.
4.8 Apply a 200 Hz, 25 mVrms signal to the left and
right input of the A/D converter.
4.9 Connect the A/D converter Optical output to the
unit’s Optical input.
4.10 Listen for clean, undistorted audio from the unit.
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