IMPORTANT SAFETY INSTRUCTIONS IMPORTANT SAFETY INSTRUCTIONS
CAUTION
RISK OF ELECTRICAL SHOCK
DO NOT OPEN
MDR-U
1. Read these instructions.
2. Keep these instructions.
WARNING
3. Heed all warnings.
4. Follow all instructions
TO REDUCE THE RISK OF SEVERE
Universal
MegaCode™
Receiver
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
INJURY OR DEATH
7. Do not install near any heat sources such as radiators, heat registers, stoves, or other
EXPLANATION OF GRAPHIC WARNING SYMBOLS
1. READ AND FOLLOW ALL INSTALLATION INSTRUCTIONS
2. NEVER LET CHILDREN OPERATE, OR PLAY WITH DOOR CONTROLS! KEEP REMOTE CONTROL AWAY FROM CHILDREN!
apparatus (including amplifiers) that produce heat.
This symbol is intended to alert the user to the presence of
un-insulated “dangerous voltage” within the product’s enclosure that
may be of sufficient magnitude to constitute a risk of electric shock.
8. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized
3. ALWAYS KEEP MOVING DOOR IN SIGHT AND AWAY FROM PEOPLE AND OBJECTS UNTIL IT IS COMPLETELY CLOSED.
plug has two blades with one wider than the other. A grounding type plug has two
For Garage Door Operator
Remote Control
NO ONE SHOULD CROSS THE PATH OF THE MOVING DOOR.
4. NEVER GO UNDER A STOPPED, PARTIALLY OPEN DOOR.
blades and a third grounding prong. The wide blade or the third prong are provided for
✶ WARNING!To reduce the risk of fire or electric shock, do not
expose this device to rain, water, or wet locations.
your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
This symbol is intended to alert the user to the presence of
important operating and maintenance (Servicing) instructions in the
literature accompanying the device.
CAUTION
Installation Instructions
9. Unplug this apparatus during lightning storms or when unused for long periods of time.
TO REDUCE THE RISK OF ELECTRIC SHOCK, DISCONNECT POWER TO THE RECEPTACLE BEFORE INSTALLING OR
REMOVING THE UNIT. WHEN REMOVING RECEPTACLE COVER SCREW, COVER MAY FALL ACROSS PLUG PINS OR
10. Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus
RECEPTACLE MAY BECOME DISPLACED. USE ONLY WITH DUPLEX RECEPTACLE HAVING CENTER SCREW. SECURE UNIT
IN PLACE BY RECEPTACLE COVER SCREW.
(760) 438-7000 • FAX (760) 438-7043
USA & Canada (800) 421-1587 & (800) 392-0123
Toll Free FAX (800) 468-1340
has been exposed to rain or moisture, does not operate normally, or has been dropped.
PRODUCT DESCRIPTION
COMPONENT LOCATIONS
DETERMINE THE BEST RECEIVER LOCATION
CHECK FOR INTERFERENCE FROM OTHER RECEIVERS
The Model MDR-U Universal MegaCode™ Receiver is designed for use as a
replacement radio control receiver in garage door operator installations. The
receiver is self-contained, not requiring an external transformer or power from the
garage door operator.The receiver plugs directly into a 120 VAC outlet. A retaining
screw is provided to secure the receiver to the outlet.
AC POWER
TERMINALS
BEST
WATCH THE
IF THE LEARN INDICATOR IS FLASHING
MDR-U RECEIVER'S
RETAINING
SCREW
LEARN & SIGNAL
INDICATOR
RECEPTION
A PLUG ON THE CEILING WILL GIVE THE BEST RADIO
RECEPTION (UNLESS THE OPERATOR'S RECEIVER
CAUSES SOME INTERFERENCE)
WITHOUT ACTIVATING ANY TRANSMITTERS,
LEARN INDICATOR
INTERFERENCE MAY BE COMING FROM
A NEARBY OPERATOR'S RECEIVER
Two screw terminals on the receiver are for connection to the garage operator’s
pushbutton input. A dry contact, Form “A”, relay in the receiver will provide a
.5-seconds closure across the terminals when the receiver activates. A flexible wire
antenna extends from the receiver’s case to provide maximum radio reception.
MegaCode™ receivers and transmitters do not contain a typical “coding switch”.
Each transmitter is pre-set at the factory to a unique code. The receiver is
programmed by sending a signal from the transmitter, storing the transmitter’s code
into the receiver’s memory. The receiver will retain its memory, even without power.
The receiver will activate only from these “memorized” transmitters. Each MDR-U
receiver can be programmed to activate from up to ten MegaCode™ transmitters.
The learn button and learn indicator are used for entering and erasing the
transmitters in the receiver’s memory. The learn indicator also displays signals
being received and can be used for troubleshooting.
TEST IF THE OPERATOR IS THE SOURCE OF THE
INTERFERENCE BY UN-PLUGGING THE OPERATOR FROM
POWER
GOOD
RECEPTION
IF THE LEARN INDICATOR STOPS FLASHING, THE OPERATOR
IS THE SOURCE OF INTERFERENCE
1. IF THE OPERATOR HAS AN EXTERNAL RADIO RECEIVER,
DISCONNECT POWER TO IT
A PLUG ABOVE
THE GROUND LEVEL
WILL PROVIDE
GOOD RADIO
RECEPTION
A PLUG CLOSE
TO GROUND LEVEL
WILL CAUSE
POOR RADIO
RECEPTION
2. IF THE OPERATOR HAS A BUILT-IN RADIO RECEIVER, CUT
THE COMPONENT THAT FEEDS POWER TO THE RECEIVER
OR CUT OFF THE OPERATOR'S ANTENNA AND REMOVE THE
OPERATOR'S
ANTENNA
POOR
RECEPTION
ANTENNA
RECEIVER'S TUNING SLUG
RELAY OUTPUT
LEARN
BUTTON
TERMINALS
1 AMP @ 32 VDC
MAXIMUM
NOTE: IT IS RECOMMENDED TO DISABLE THE OPERATOR'S
RECEIVER TO PREVENT THE OLD REMOTES FROM ACTIVATING IT
CONNECT THE RECEIVER TO THE OPERATOR
INSTALL THE RECEIVER
PROGRAM AND TEST THE RECEIVER
LINEAR LIMITED WARRANTY
This Linear product is warranted against defects in material and workmanship for twelve (12) months. The Warranty
Expiration Date is labeled on the product. This warranty extends only to wholesale customers who buy direct
from Linear or through Linear’s normal distribution channels. Linear does not warrant this product to consumers.
Consumers should inquire from their selling dealer as to the nature of the dealer’s warranty, if any. There are no
obligations or liabilities on the part of Linear Corporation for consequential damages arising out of or in
connection with use or performance of this product or other indirect damages with respect to loss of property,
revenue, or profit, or cost of removal, installation, or reinstallation. All implied warranties, including implied
warranties for merchantability and implied warranties for fitness, are valid only until Warranty Expiration Date as labeled
on the product. This Linear Corporation Warranty is in lieu of all other warranties express or implied.
All products returned for warranty service require a Return Product Authorization Number (RPA#). Contact Linear
Technical Services at 1-800-421-1587 for an RPA# and other important details.
ADDING TRANSMITTERS
1. PRESS AND RELEASE THE
LEARN BUTTON
ERASING TRANSMITTERS
1. PRESS AND HOLD DOWN THE LEARN BUTTON
CONNECT 2-CONDUCTOR WIRE TO THE
MDR-U RECEIVER RELAY OUTPUT TERMINALS
DISCONNECT POWER TO THE GARAGE
DOOR OPERATOR BEFORE PROCEEDING
REMOVE THE OUTLET'S COVER
PLATE SCREW AND PLUG THE
RECEIVER INTO THE 110 VAC OUTLET
2. THE LEARN INDICATOR WILL
FLASH COUNTING THE NUMBER
OF TRANSMITTERS IN MEMORY
UL NOTE: ALL LOW VOLTAGE CLASS 2 CABLE
USED WITH THE OPERATOR MUST BE UL LISTED
TYPE CL2, CL2P, CL2R, OR CL2X OR OTHER CABLE
WITH EQUIVALENT OR BETTER ELECTRICAL,
MECHANICAL, AND FLAMMABILITY RATINGS
2. THE LEARN INDICATOR WILL LIGHT
IF THERE'S ROOM IN MEMORY
(UP TO 10 TRANSMITTERS WILL FIT)
3. CONTINUE HOLDING DOWN
THE LEARN BUTTON
NOTE: BE SURE THAT THE OUTLET
IS NOT CONTROLLED BY A WALL SWITCH
3. ACTIVATE THE TRANSMITTER
WHILE THE INDICATOR IS LIT
(WITHIN 15 SECONDS)
4. 5 SECONDS AFTER THE COUNT
THE INDICATOR WILL FLASH ONCE
SHOWING THE MEMORY ERASURE
WALL PUSHBUTTON
CONNECTION
IMPORTANT !!!
ROUTE THE WIRE AND CONNECT IT
TO EITHER THE WALL PUSHBUTTON OR
4. INDICATOR FLASHES
Linear radio controls provide a reliable communications link and fill an important need in portable wireless signaling.
However, there are some limitations which must be observed.
FROM
DIRECTLY TO THE DOOR OPERATOR
OPERATOR
(POLARITY NOT IMPORTANT)
5. REPEAT STEPS FOR ADDITIONAL
TRANSMITTERS
5. RELEASE THE BUTTON, THE UNIT
ENTERS LEARN MODE FOR 15 SECONDS
•
For U.S. installations only:The radios are required to comply with FCC Rules and Regulations as Part 15 devices. As
such, they have limited transmitter power and therefore limited range.
PUSHBUTTON
MDR-U
SECURE THE
WIRE WITH
INSULATED
STAPLES
DIRECT OPERATOR
CONNECTION
•
A receiver cannot respond to more than one transmitted signal at a time and may be blocked by radio signals that
occur on or near their operating frequencies, regardless of code settings.
Changes or modifications to the device may void FCC compliance.
SECURE THE RECEIVER
TO THE OUTLET WITH
THE RETAINING SCREW
•
•
•
Infrequently used radio links should be tested regularly to protect against undetected interference or fault.
A general knowledge of radio and its vagaries should be gained prior to acting as a wholesale distributor or dealer,
and these facts should be communicated to the ultimate users.
TEST RECEIVER
ACTIVATE EACH TRANSMITTER
AND VERIFY THAT THE RECEIVER
AND DOOR OPERATOR ACTIVATES
•
This device complies with FCC Part 15 and Industry Canada Rules and Regulations. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
ANTENNA
3
2
1
OPERATOR TERMINALS 1 & 2
(OR THE SAME TERMINALS
THE WALL PUSHBUTTON USES)
Copyright © 2004 Linear Corporation
220675 A
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