CLEAR-COM ENCORE HB-702 TWO-CHANNEL HEADSET STATION HB-704 FOUR-CHANNEL HEADSET STATION INSTRUCTION MANUAL
HB-702/HB-704 Two- & Four-Channel Headset Stations Instruction Manual Copyright© 2013 ΗΜΕClear-Com Ltd All Rights Reserved Part Number: 810351Z Rev. 3 Legal Disclaimer Clear-Com, the Clear-Com logo, and Clear-Com Concert are trademarks or registered trademarks of HM Electronics, Inc. The software described in this document is furnished under a license agreement and may be used only in accordance with the terms of the agreement.
CONTENTS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii HB-702/HB-704 TWO- AND FOUR-CHANNEL HEAD-
IMPORTANT SAFETY INSTRUCTIONS Please read and follow these instructions before operating this product. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol alerts you to the presence of uninsulated dangerous voltage within the product's enclosure that might be of sufficient magnitude to constitute a risk of electric shock. Do not open the product's case. This symbol informs you that important operating and maintenance instructions are included in the literature accompanying this product.
OPERATION INTRODUCTION Congratulations on choosing this Clear-Com product. Clear-Com was established in 1968 and remains the market leader in providing intercoms for entertainment, educational, broadcast and industrial applications. The ruggedness and high build-quality of Clear-Com products defines the industry standard. In fact, many of our original beltpacks and main stations are still in daily use around the world.
EB7-4W four-wire option supports two-channel operation and may only be used on the HB-702. The HB-702 and HB-704 are compatible with all Clear-Com party-line intercoms. OPERATION Normal operation of the HB-702 or HB-704 headset station requires only the front-panel controls. The controls located elsewhere on the unit are intended to be set-and-forget in nature. For intercom operation, set the volume control to the desired level and press the talk button when talking.
• LATCHING: Press and release the button quickly to latch the talk function. Press and release the button again to turn off the talk function. • TALK INDICATION: The talk button lights amber when the talk function is active. When the talk function is not active, but the station is receiving electrical power, the button lights blue. 2. Call button and light: Pressing the call button will send a call signal on the selected channel. All the call lights on that channel will then flash.
INTERNAL ADJUSTMENTS AND CONNECTIONS The controls and connectors found inside the HB-702 and HB-704 are shown in the following figure and described by the following text. The jumpers can be accessed without completely removing the panel from its wall box by removing the top two screws and loosening the bottom two screws a few turns. The panel can then be leaned out from the wall. The jumpers will be accessible as shown in the lower view of Figure 1-2.
• Switch 1—Latch Disable. Setting the latch disable switch to the on position will disable the latching function of the talk button. In this mode, the talk button must be held in continuously while the operator is talking. • Switch 2—Long Line. If a long cable run is unavoidable and approaches 1,000 ft. (305 m) or more, set the long line option jumper to the on position. The ability to set a sidetone null depends upon properly setting this switch. 8.
Figure 1-3 HB-702 and HB-704 Cable Wiring 9. Option Board Jumpers: The two jumper plugs, P1 and P3, must be installed when optional modules are not used. When the optional four-wire or TW modules are used, both P1 and P3 must be removed. Save these jumper plugs for possible future use. Note: 1-6 The HB-702 and HB-704 will not operate without either these jumper plugs or the optional modules installed. The orientation of P1 in J1 and P3 in J3 does not matter.
INSTALLATION 1. Unpack the unit and inspect for any damage that may have occurred during shipping. 2. Connect the intercom lines. If less than the maximum number of intercom lines are to be connected, link unused intercom inputs to a connected input with jumper wires. 3. Install the HB-702 or HB-704 into the two-gang outlet box. For additional information, refer to the Clear-Com System Installation Manual. 4. Connect the appropriate headset or handset. 5. Set listen levels and sidetones.
2-2 HB-702/HB-704 Two- and Four-Channel Head-
MAINTENANCE INTRODUCTION This chapter provides maintenance information including troubleshooting tips and block diagrams. Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
BLOCK DIAGRAM OF HB-704 FOUR-CHANNEL HEADSET STATION EQ/ LIM Sidetone Null Intercom Volume Headset Mic Headset Output Mic Mute Talk Power Long Line Talk Call Call Send & Receive Microprocessor Latch Disable TW Option Call Light RMK Ch. D Ch. C Common +30 VDC Channel Switch Ch. B Ch. A Ground Figure 3-5 HB-704 Block Diagram TROUBLESHOOTING TIPS SYMPTOM System does not operate. Talk button does not light amber when talk button is pressed. Headset does not operate.
SYMPTOM CAUSE SOLUTION (3) Plug P3 is missing on circuit board. (3) Plug P3 must be installed in the J3 jack if the EB-4W or EB-TW option is not used. Hum or buzz in system Inductive pickup caused by close proximity of this headset station or connected stations to power lines or transformers. Relocate the offending unit or wiring. If the cable run is exceptionally long, consider adding and using the EB-4W four-wire option module.
SYMPTOM The call signal does not function. CAUSE SOLUTION (1) Excessive DC loading of intercom line. (1) Remove any audio transformers or other equipment that may be connected across the intercom line. If equipment other than Clear-Com intercom equipment must be connected to the intercom line, please contact Clear-Com application or service personnel for advice. (2) Far too many terminations on the intercom line.
TECHNICAL SPECIFICATIONS HB-702/HB-704 TWO- AND FOUR CHANNEL HEADSET STATIONS dBu is an absolute measurement. 0 dBu is referenced to 0.
Max Gain Headset Mic - Party Line Party Line - Headset Out Power Input Voltage Range Input Current (Idle) Input Current (Max) 41dB ± 2dB >= 34dB 20-30 VDC <= 50mA <=100mA Internal Adjustments and Connections Intercom Line (HB-702/HB-704) Option Switches Option Board Jumper Front Panel Connectors Headset: Front Panel Controls & Indicators Environmental Dimensions (HB-702/HB-704) Weight Seven terminal connector Two DIP switches Two sets of options jumpers (1) XLR-4M (1) Sidetone control (1) Talk but
LIMITED WARRANTY Clear-Com offers 24 x 7 customer support if you have an Extended Warranty or Service Contract. Return Material Authorization (RMA) numbers are required for all returns. Both warranty and non-warranty repairs are available. Clear-Com warrants that at the time of purchase, the equipment supplied complies with any specification in the order confirmation when used under normal conditions, and is free from defects in workmanship and materials during the warranty period.
period will be offered at no charge between 09:00 and 17:00 according to the customer’s local time zone. In addition, for customers who purchase an Extended Warranty or Service Contract, 24-hour customer support is offered immediately upon purchase of such agreement. For more information, contact your authorized dealer, distributor, or sales representative. Instructions for reaching Clear-Com’s User Support Centers are given below.
EXTENDED WARRANTY If you purchase an Extended Warranty, you are also given access free of charge to the User Support Center 24 hours a day, 7 days a week. You can purchase an extended warranty at any time during the first two years of ownership of the product. The purchase of an extended warranty extends to five years the warranty of any product offered with a standard two-year warranty. The total warranty period will not extend beyond five years.
failure to follow instructions in the manual, defective or improperly associated equipment, attempts at modification and repair not approved by Clear-Com, and shipping damage. Products with their serial numbers removed or defaced are not covered by this warranty.
