PRO 4 CHANNEL MULTI CHANNEL WIRELESS SYSTEM WITH DM4/DM4D DISTRIBUTION MODULE OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC.
INTRODUCTION The PRO 4 CHANNEL system is a high quality, multi-channel wireless microphone system designed for sound stage, studio, and theater applications. Multi-channel problems such as interaction of receivers, intermodulation and desensitization, etc. have been eliminated through creative engineering and superior design. The integral DM4 distribution module provides convenience of operation from a common antenna system and power supply without degrading the performance of the receivers.
GENERAL TECHNICAL DESCRIPTION The PRO 4 CHANNEL consists of two sub-systems; the frame which contains the receivers, receiver mounting hardware, and DC power supply, and the CDM4 RF/power distribution module. The DM4 RF/power distribution module is the heart of the PRO 4 CHANNEL system. Helical resonators in the front end of the RF section attenuate out-of-band RF signals preventing intermodulation and front end overload.
FRONT PANEL DESCRIPTION DM4D MODULE: POWER SWITCH - Power to the individual receivers is controlled with this switch. PWR LED - This LED will light when power is provided from the integral DC power supply. RECEIVER MODULE: Please refer to the manual for your particular receiver for a complete description. CH.
REAR PANEL DESCRIPTION SERIAL/FREQUENCY LABEL - This label indicates the serial number of the DM4 module. It also indicates the RF pass-band of the unit. IMPORTANT - The receivers installed in the unit must fall between the frequencies indicated on the label. Serious signal loss results if the receivers are outside the RF pass-band. ANTENNA JACK(S) - The Standard system will have one jack for connection to the antenna system. The Diversity model will have two jacks for two separate antenna systems.
INSTALLATION The PRO4 CHANNEL is designed to contain up to four receivers. Installation of these receivers is quite simple. First, place the entire assembly face down on a firm surface and remove the large phillips head screws which hold the mounting brackets at the rear of the unit. (See Figure 3) Place the receiver(s), front end first against the front panel. Seat the front end of the receiver into the recessed lip of the PRO4 CHANNEL front panel.
TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE NO POWER LEDs OR AUDIO 1) Power switch in the OFF position. Switch to ON. POWER LED LIGHTS ON DM4 BUT NO LIGHTS ON RECEIVERS 1) Power leads in back not connected to receivers. Check power connections. POWER AND MODULATION LEDs ON, BUT NO AUDIO 1) No audio connection to recorder or mixer. Check connections. POWER LEDs ON, NO MODULATION LEDs 1) Transmitters not on or in mute position. Check transmitters. 2) Transmitters have dead batteries, check batteries.
SPECIFICATIONS DM4/DM4D RF/POWER DISTRIBUTION MODULE RF Gain: 1.5 dB RF Output: DM4: DM4D: Four outputs, 50 Ohm, BNC Eight outputs, 50 Ohm, BNC Filtering: Two section helical resonator per antenna Third Order Intercept: +25 dBm Power Input: 120 VAC Power Consumption: Diversity: Standard: 18 Watts 10 Watts Connectors: RF: POWER OUTPUT: BNC 2.
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 out the inter-connecting cords and then go through the TROUBLE SHOOTING section in the manual We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt 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, we will, at our option, repair or replace any defective parts without charge for either parts or labor.
