Speaker Phase Testing - Data East laser WAR Instruction Manual

SPEAKER PHASE TESTING

Each of the three speaker outputs on the sound board has one position and one negative
connection. It is important that all speakers have identical connections with regard to the output
polarity.
If one speaker is conected having opposite polarity of the others, the sound produced will lack
bass frequencies and the result, sounds like a very poor sound system.
To test for proper Speaker Phase, proceed as follows:
Using the Sound Test/Manual, cycle through the Left, Center, and Right Sine functions, listening to
the difference in volume and bass that each function produces. The Center sine should produce
more volume and bass than Left or Right Sine alone. If the center sine has the same or less, one
speaker is out of phase.
To correct improper speaker phasing, use one of the following methods:
1. If speaker terminals are marked positive and negative, then verify that the positive and negative
speaker outputs are connected to the proper terminals. If terminals are not marked, proceed
to method 2a or 2b.
2a. Disconnect one wire only from the bottom cabinet speaker, cycle through the speaker phase
test described previously and listen to the volume and bass difference between left, center and
right sine functions. When the Center Sine is produced, the left and right speaker will produce
the 60 cycle tone at equal levels. If Center Sine lacks volume and bass as compared to Left or
Right Sines, then one panel speaker is out of phase (refer to Step 2b). If center producers more
volume and bass, the cabinet speaker was out of phase and you must reverse original order of
connection.
2b. If center had less volume and bass, reverse connections on one of the speaker panel speakers
and reconnect cabinet speaker. Cycle through Sound Test/Manual again. If center sine has the
same or less volume and bass, reverse the cabinet speaker connections.
3. Disconnect the speaker output connector from the sound board and connect a 1 Y2 volt battery
to each pair of speaker wires ensuring the positive battery terminal is connected to the positive
speaker wire. (Refer to backbox wiring diagram for sound board speaker connector and wire
colors). Check the associated speaker for cone movement. If cone deflects outward the
speaker is connected properly.
DIGITAL DISPLAY TESTS
Digital displays are driven by digit and segment driver circuits. Digit drivers select which of the
seven digits on a particular player display should be on and segment drivers select which segments
of a particular digit should be on. During the display tests, all displays will cycle through numbers 0
through 9 allowing you to check that segments are being turned on properly. Then each digit of
each display will cycle with all segments on, allowing you to check digits are being turned on
properly.
DISPLAY TEST I AUTOMATIC
Use the STEP button to advance through the previous tests. Players 1 and 2 will display Display Auto
and then cycle through numbers and digits as explained above.
DISPLAY TEST/MANUAL
Use the STEP button to advance through the previous tests. Players 1 and 2 will display Display
Manual and then all displays will display zeros. Use the GAME START button to cycle through
numbers and digits.
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