Gain Adjustment Control; Equalization (Eq) Adjustment Control; Replacing The Decora Faceplate; Sveq 100 D) - Extron electronics A-3 User Manual

Operation, cont'd
C Power supply voltage polarity is critical. Incorrect
voltage polarity can damage the power supply and the
line driver. Identify the power cord negative lead by
the ridges on the side of the cord.
To verify the polarity before connection, plug in the power
supply with no load and check the output with a voltmeter.
W The two power cord wires must be kept separate while
the power supply is plugged in. Remove power before
wiring.
N Do not tin the power supply leads before installing in the
direct insertion connector. Tinned wires are not as secure
in the connectors and could be pulled out.

Gain adjustment control

The gain control adjusts picture brightness by compensating
for signal amplitude loss caused by cable resistance. To adjust
the output gain, view the display while using a small, flat-blade
screwdriver to rotate the potentiometer. This control produces a
gain adjustment ranging from -1 dB to + 3 dB (CVEQ and luma
of SVEQ) and from 0 dB to +10 dB (chroma of SVEQ). Select the
setting that gives the best picture brightness.
CVEQ 100 Series
N The gain control is a potentiometer with a mechanical stop
at the high and the low end. After you have reached the
high or low end of the adjustment, no change is apparent
on the display. The default is unity (the dot position)
You can judge the adjustment visually by viewing the display.
For a more precise setting use an oscilloscope or a waveform
monitor connected to the far end of the output cable, and adjust
the gain so that the level at the waveform monitor is 100 IRE.

Equalization (EQ) adjustment control

The equalization control adjusts the output level and peaking
to get a sharp picture. This adjustment changes the level and
peaking of the output signal to compensate for capacitance
caused by up to 1000 feet (300 meters) of Extron MHR cable.
This control produces an equalization adjustment ranging from
0 dB to + 7 dB (CVEQ and luma of SVEQ).
CVEQ 100 and SVEQ 100 Series • Operation
3-12
SVEQ 100 Series
CVEQ 100 Series
Use a small, flat-blade screwdriver to rotate this control. View
the display and select the setting that gives the sharpest picture.
For a more precise setting, you can use an oscilloscope or a
waveform monitor connected to the far end of the output
cable, and adjust the equalization so that the color burst ranges
between -20 IRE and +20 IRE.
The EQ control is a potentiometer with a mechanical stop
N
at the high and the low end. After you have reached the
high or low end of the adjustment, no change is apparent
on the display. The default is set to 0 dB (the dot position).
Replacing the Decora Faceplate (CVEQ 100 D
and SVEQ 100 D)
The front faceplate is replaced by removing the two rear panel
mounting screws, replacing the faceplate, then reattaching the
two screws, as shown in the CVEQ 100 D example below.
N The faceplate for the SVEQ 100 D is replaced in similar
fashion.
Rear Panel
Faceplate (rear)
Removing the CVEQ 100 D faceplate
CVEQ 100 and SVEQ 100 Series • Operation
SVEQ 100 Series
Mounting
Screws
3-13