INSTRUCTION MANUAL CR187 Compact Receiver Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.
CR187 2 LECTROSONICS, INC.
Compact Receiver Table of Contents Introduction.............................................................................................................................................................................................4 General Technical Description ..............................................................................................................................................................4 CR187 Block Diagram................................................................
CR187 General Technical Description The block diagram of the receiver provides a basic overview of the major circuit sections. The RF front-end amplifier consists of three cascaded pairs of helical resonators for high selectivity. Between the three resonators are two low noise grounded gate JFET amplifiers. These amplifiers are designed to pro vide only enough gain to make up for the loss through the helical resonators.
Compact Receiver Controls and Functions Side and Front Panels LECTROSONICS CR187 OFF MODULATION 5-0 dBV 2-0 -20 0dB OUTPUT EXT S/N: XXXX INT BATT POWER This device complies with part 15 of the FCC rules. Operation is subject to the condition that this device does not cause harmful interference. RF Modulation LEDs The Modulation LEDs indicate the audio level of the in coming signal.
CR187 Receiver Rear Panel Battery Replacement The CR187 is powered by a standard alkaline 9 volt battery. It is important that you use ONLY an ALKALINE battery for longest life. Standard zinc-carbon batteries marked “heavy duty” or “long-lasting” are not adequate. They will provide only about one hour of operation. Similarly, nicad rechargeable batteries give less than 2 hours of operation, and will also run down quite abrupt ly. Alkaline batteries provide about 5 hours of operation.
Compact Receiver Operating Instructions 1) Connect the power cord or install the battery. (The CR187 is a negative ground device. Do not connect this receiver to a positive ground device through the audio cabling. Damage to either device could result.) 2) Attach and extend the antenna. 3) Connect the audio cable. 4) Set the front panel switch to either “EXT” or “INT”, depending upon the power source. Check to see that the red POWER LED lights up.
CR187 Antenna Use and Placement Connect the antenna to the front panel jack. Position the antenna so that it is not touching any metallic surfaces. It is also good to position the receiver so that there is a direct “line of sight” between the transmitter and the re ceiver antenna. In situations where the operating range is less than about 50 feet, the antenna positioning is much less critical. A wireless transmitter sends a radio signal out in all directions.
Compact Receiver Troubleshooting Before proceding, ensure that you have a good battery in the receiver (or a properly connected AC adapter) and that the POWER LED is glowing brightly.
CR187 Replacement Parts and Accessories Part No.
Compact Receiver Service and Repair If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting cables and then go through the Troubleshooting section in this manual. We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop at tempt anything other than the simplest repair.
LIMITED ONE YEAR WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor.
