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Performance Check and Calibration Procedures
760A / 760D / 760N
5–9
14. Check Bar Crosstalk
a. Connect the leveled audio signal generator output to the LEFT AUDIO
INPUT and set SELECT to AUX.
b. Set the leveled audio signal generator for the following output:
Output Sine Wave
Frequency 1 kHz
Output Level
760A 4.2 V
rms
760D 5.5 V
rms
760N 9.8 V
rms
c. CHECK – that none of the RIGHT or AUXILIARY bar segments are
lit.
d. Move the input from the LEFT to the RIGHT AUDIO INPUT.
e. CHECK – that none of the LEFT or AUXILIARY bar segments are lit.
f. Move the input from the RIGHT to the AUXILIARY AUDIO INPUT.
g. CHECK – that none of the LEFT or RIGHT bar segments are lit.
15. Check Third Bar Selection
a. Connect the output of the leveled audio signal generator to the LEFT and
RIGHT AUDIO INPUTs, and ensure there is no input to the AUXILIA-
RY AUDIO INPUT. Set the audio generator output level to 775 mV
rms
(1.55 mV
rms
for 760D or 760N ).
b. Set the SELECT control to AUX and PEAK HOLD to ON.
c. CHECK – that no segments of the third bar are lit.
d. Set the SELECT control to
L+R
2
(SUM).
e. CHECK – that the third bar is at the same level as the LEFT and
RIGHT LED bars.
f. Set the SELECT control to
L–R
2
(DIFF).
g. CHECK – that no segments are lit on the third bar.
h. (760D and 760N only) Reset the Input Termination, Sensitivity and
Orientation jumpers to fit your application. Factory set positions are:
Input Sensitivity: U
Input Termination: INF
Display Orientation: Sound Stage
See Figure 5–1 for jumper locations.