Olson Technology LCD-550x1 - Manual (Page 3)

025-000345 REV B Page 3
INTRODUCTION
The LCD-550 is a small low cost demodulator for use in cable and off-air applications. It is designed to mount
in Olson Technology’s LCM-550-RKA rack mountable chassis. The demodulator is shipped as a single LCD-550
and occupies 3 slots in the LCM-550 RKA chassis.
The LCD-550 can be made into a dual demodulator assembly by removing the front panel and guide pin on the
second LCD-550 and installing on top of the first demodulator.
The units have a front panel switch that switches between NTSC broadcast channels and a user defined CATV
tuning mode. The user can select from 6 NTSC channel plans and frequency tuning.
The units have a single RCA type audio output connector. The type of signal at this connector is selected from
3 types by internal jumpers. The user can choose normal audio, multiplex audio, or subcarrier. RF Input and Video
Output connectors are “F” type. See Figure 2 for connector location.
The demods have an LED that indicates low input levels. This LED also flashes with invalid tuning settings.
(LED is labeled “NO VIDEO” on some early models)
INSTALLATION
Units are shipped in the Olson Tech CATV tuning mode with normal audio output. If other settings are
required, go to page 4 for instructions.
Slide the unit into the rack shelf, making sure that the notch on the rear of the unit engages the tab on the shelf.
Install and tighten the front thumb screw.
Connect the Audio and Video Output cables and the RF Input cable. Note that the combiner on the rear of
some LCM-550 rack shelves is for outputs, not inputs. It is recommended that units be added with the rack assembly
powered down, but they can be added hot as long as the long ground pin makes contact first. Connect the power
cable(s).
Set the tuning switches to the desired channel. If the unit is driving an LCM-550 with normal audio, no
internal adjustments will be required. See Figure 1 for front panel controls.