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LR-4 LARC Framelink Service Manual RadioFans.CN 收音机爱 好者资料库 Lexicon Precautions This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. Printed in the United States of America Lexicon Part # 070-11475 Lexicon, Inc. 3 Oak Park Bedford, MA 01730 USA Tel 781-280-0300 Fax 781-280-0490 Copyright 1996 Lexicon. Inc. All Rights Reserved. RadioFans.CN 收音机爱 好者资料库 LR-4 Service Manual Read Instructions Read all safety and operating instruc- tions before operating the unit. Retain Instructions Keep the safety and operating instruc- tions for future reference. Heed Warnings Adhere to all warnings on the unit and in the operating instructions. Follow Instructions Follow operating and use instructions. Heat Keep the unit away from heat sources such as radia- tors, heat registers, stoves, etc., including amplifiers which produce heat. Ventilation Make sure that the location or position of the unit does not interfere with its proper ventilation. For example, the unit should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a cabinet which impedes the flow of air through the ventilation openings. Wall or Ceiling Mounting Do not mount the unit to a wall or ceiling except as recommended by the manufacturer. Power Sources Connect the unit only to a power supply of the type described in the operating instructions, or as marked on the unit. Grounding or Polarization* Take precautions not to defeat the grounding or polarization of the units power cord. *Not applicable in Canada. Power Cord Protection Route power supply cords so that they are not likely to be walked on or pinched by items placed on or against them, paying particular attention to cords at plugs, convenience receptacles, and the point at which they exit from the unit. Nonuse Periods Unplug the power cord of the unit from the outlet when the unit is to be left unused for a long period of time. Water and Moisture Do not use the unit near water for example, near a sink, in a wet basement, near a swimming pool, near an open window, etc. Object and liquid entry Do not allow objects to fall or liquids to be spilled into the enclosure through openings. Cleaning The unit should be cleaned only as recommended by the manufacturer. Servicing Do not attempt any service beyond that described in the operating instructions. Refer all other service needs to qualified service personnel. Damage requiring service The unit should be serviced by qualified service personnel when: the power supply cord or the plug has been damaged, objects have fallen, or liquid has been spilled into the unit, the unit has been exposed to rain, the unit does not appear to operate normally or exhibits a marked change in performance, the unit has been dropped, or the enclosure damaged. Outdoor Antenna Grounding If an outside antenna is connected to the receiver, be sure the antenna system is grounded so as to provide some protection against voltage surges and built-up static charges. Section 810 of the Na- tional Electrical Code, ANSI/NFPA No. 70-1984, provides information with respect to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna-discharge unit, size of grounding conductors, loca- tion of antenna-discharge unit, connection to grounding electrodes, and requirements for the grounding electrode. See figure below. Power Lines An outside antenna should be located away from power lines. Safety Suggestions RadioFans.CN 收音机爱 好者资料库 Lexicon SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service and repair of this instrument. Failure to comply with these precautions, or with specific warnings elsewhere in these instructions violates safety standards of design manufacture and intended use of the instrument. Lexicon assumes no liability for the customers failure to comply with these requirements. SAFETY SYMBOLS General definitions of safety symbols used on equipment or in manuals. Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument. Indicates dangerous voltage. (Terminals fed from the interior by voltage exceed- ing 1000 volts must be so marked.) The WARNING sign denotes a hazard. It calls attention to a procedure, practice, condition or the like which, if not correctly performed or adhered to, could result in injury or death to personnel. The CAUTION sign denotes a hazard. It calls attention to an operating procedure, practice, condition or the like which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. The NOTE sign denotes important infor- mation. It calls attention to procedure, practice, condition or the like which is essential to highlight. GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cabi- net must be connected to an electrical ground. The instru- ment is equipped with a three-conductor AC power cable. The power cable must either be plugged into an approved three-contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly connected to an electrical ground (safety ground) at the power outlet. The power jack and mating plug of the power cable meet International Electrotechnical Commission (IEC) safety standards. DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified maintenance personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power and discharge circuits before touching them. DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present. DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. DANGEROUS PROCEDURE WARNINGS Warnings, such as the example below, precede potentially dangerous procedures throughout this manual. Instructions contained in the warnings must be followed. Dangerous voltages, capable of causing death, are pres- ent in this instrument. Use extreme caution when han- dling, testing and adjusting. WARNING NOTE: CAUTION Notch Pin 1 CAUTION ICs inserted backwards will be destroyed. Incorrect insertion of ICs is also likely to cause damage to the board. Electrostatic Discharge (ESD) Precautions The following practices minimize possible damage to ICs resulting from electrostatic discharge or improper inser- tion. Keep parts in original containers until ready for use. Avoid having plastic, vinyl or styrofoam in the work area. .Wear an anti-static wrist-strap. Discharge personal static before handling devices. Remove and insert boards with care. When removing boards, handle only by non-conductive surfaces and never touch open-edge connectors ex- cept at a static-free workstation.* Minimize handling of ICs. .Handle each IC by its body. Do not slide ICs or boards over any surface. Insert ICs with the proper orientation, and watch for bent pins on ICs. Use anti-static containers for handling and transport. *To make a plastic-laminated workbench anti-static, wash with a solution of Lux liquid detergent, and allow to dry without rinsing. CAUTION WARNING LR-4 Service Manual LR-4 LARC Framelink Service Manual LR-4 Service Manual Table of Contents 1.Controls and Connectors Front Panel . 1-1 Rear Panel. 1-1 Connections. 1-1 Periodic Maintenance . 1-2 Ordering parts. 1-2 Returning units for service . 1-2 2.Specifications 3.Performance Verification Required Equipment . 3-1 Setup. 3-1 AC Current. 3-2 Power Supply/LEDs Initialization . 3-2 Wraparound Test . 3-2 Diagnostic Loop . 3-3 LR-4 Power Up Diagnostics Descriptions. 3-3 Extended Diagnostics Descriptions . 3-4 4.Theory of Operation Overview. 4-1 Functions . 4-1 Z80 Addressing . 4-1 DUART I/O . 4-2 Serial Data Ports . 4-2 Power. 4-3 Diagnostics . 4-3 Signal Names . 4-3 5.Parts List 6.Schematics and Assembly Drawings Lexicon LR-4 Service Manual 1-1 Controls and Connectors 1 Controls and Connectors 224XL, 480L or 300L 224XL, 480L or 300L 224XL, 480L or 300L 224XL, 480L or 300L LR-4 to Mainframe Cable When connecting the LR4 to a mainframe more than 10 away. use proper RS422, shielded 9-conductor cable, wired as shown to two 9-pin D-sub connectors (male). LR-4 to LARC Cable LR-4 Front Panel MACH 1-4 LEDs Indicate which machine is currently selected for LARC control. Power Provides front panel control of power on/off. LED lights when power is on. AC Power Standard 3-pin IEC power connector. 100-115/230V, 50-60Hz internal switches set voltage. LARC DE9 connector for interface with LARC (Lexicon Alphanumeric Remote Control). MACH 1-4 DE9 connectors for interface to LARC ports of Lexicon 224XL, 480L or 300L. LR-4 Rear Panel LR-4 ConnectionsConnection to the LARC should be made via the flexible 50 ft. cable supplied with the LARC. Connection to other Lexicon devices (224XL, 480L and 300L) should be made using a 10 ft Framelink cable, Lexicon Part No. 680-04734. Lexicon 1-2 Controls and Connectors Before returning a unit, for warranty or non-warranty service, consult with Lexicon to determine the extent of the problem, and to obtain Return Authorization. No equipment will be accepted without Return Authorization from Lexicon. If you choose to return an LR-4 to Lexicon for service, Lexicon assumes no responsibility for the unit in shipment from customer to the factory, whether the unit is in or out of warranty. All shipments must be well packed (using the original packing materials if possible), properly insured, and consigned to a reliable shipping agent. When returning a unit for service, please include the following information: Name Company name Street address City, State, Zip Code, Country Telephone number (including Area Code) Serial number of unit Description of the problem Preferred method of return shipment Return Authorization #, both inside and outside of package Please enclose a brief note describing conversations with Lexicon personnel and give the name and telephone number of the person directly responsible for maintaining the unit. Do not include accessories such as manuals, cables, footswitches, etc. with the unit, unless specifically requested to do so by Lexicon Service personnel. Under normal conditions the LR-4 requires minimal maintenance. Use a soft, lint-free cloth slightly dampened with warm water and a mild detergent to clean the exterior surfaces of the unit. Do not use alcohol, benzene or acetone-based cleaners or any strong commercial cleaners. Avoid using abrasive materials such as steel wool or metal polish. If the unit is exposed to a dusty environment, a vacuum or low-pressure blower may be used to remove dust from the units exterior. Periodic Maintenance When ordering parts, identify each part by type, value and Lexicon Part Number. Replacement parts can be ordered from: Lexicon, Inc. 3 Oak Park Bedford, MA 01730 Tel 781-280-0300 Fax 781-280-0499 Attn: Customer Service Ordering Parts Returning units for service Reflex Service Manual 2-1 2 Specifications Dimensions 19.0W x 1.75H x 4D (483x45x102mm) 19 rack mount standard, 1U high Weight Net weight: 2.75lbs (1.24kg) Shipping weight: 3.75lbs (1.7kg) Power Requirements 100/115VAC, -5/+10% or 230VAC, +10%, 50-60 Hz, 10W (Factory set) Connectors 3-pin IEC power connector Rear Panel Connectors 5 female DE-9 connectors, RS-422 serial communication, 9600 Baud Front Panel Control 5 LEDs, AC power switch Environment Operating Temperature32 to 95F (0 to 35 C) Storage-22 to 167F (-30 to 75C) Relative Humidity95% max without condensation Specifications subject to change without notice. LR-4 Service Manual 3-1 Performance Verification Performance Verification3 Clean antistatic well lit wor