Extron Electronics IN3218 - Manual (Page 7)

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© 1997 - INLINE, INC. IN3212 / IN3214 / IN3218 OPERATION MANUAL - REV. 1 10/25/97
LOOP OUTPUT CONNECTOR
The loop output connector provides a passive loop-through signal. This can be looped through to
additional amplifiers to create a larger DA system or to drive a local monitor. In order to use the loop
output, the Input termination jumper (internal) must be set to High Z (unterminated). The location of the
input termination jumper is indicated on pages 4-6.
GAIN AND PEAKING CONTROLS
The gain controls can be used to compensate for video signal voltage losses. Peaking may be used to
reboost high frequency components that have been attenuated by long cable runs. The peaking control
employs an equalization circuit, introducing an adjustable high frequency peak.
Gain Control
The gain control is used to increase/decrease the contrast of an image by adjusting the amplitude of the
video signal. The control has a range of 0.7 to 1.4. Using the IN9333 adjustment tool, gently turn the
control clockwise to increase the video gain, and counter-clockwise to decrease the gain.
Peaking Control
The peaking control enhances image detail and sharpness by boosting high frequencies. Using the
IN9333 adjustment tool, gently turn the control clockwise to increase peaking, and counter-clockwise to
decrease the peaking.
INTERNAL CONTROLS
CAUTION: Adjustment of the IN3212 / IN3214 / IN3218 internal controls must only be carried out
by qualified technicians. Care must be taken to avoid static shock to the internal components.
The IN3212 / IN3214 / IN3218 have internal jumpers which can be accessed using the following
procedure:
1. Remove the screws from the sides of the unit.
2. (For IN3212 / IN3214 only) Remove hex-nuts from the output BNC connectors.
3. Slide the top cover off.
4. Identify location of jumpers using the diagrams on pages 4-6 and adjust as needed.
5. Replace top cover and tighten the BNC hex-nuts (if applicable) and the side screws.