ORBAN 222A_Manual 电路图.pdf

RadioFans.CN 收音机爱 好者资料库 IMPORTANT NOTE: Refer to the units rear panel for your Model #. Model Number: Description: 222A/U Enhancer, 120V 222A/E Enhancer, 230V MANUAL: Part Number: Description: 95070-000-05 222A Manual CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Read the manual. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 The 222A Stereo Spatial Enhancer is protected by U.S. patent #4,450,871 Orban is a registered trademark. All trademarks are property of their respective companies. This manual is part number 95070.000.05 Copyright 2000, 2001 Orban 1525 ALVARADO STREET, SAN LEANDRO, CA 94577 USA Phone: (1) 510/351-3500; Fax: (1) 510/351-0500; E-Mail: ; Site: P/N: 95070-000-05 2-6 INSTALLATION Orban Model 222A Grounding Very often, grounding is approached in a “hit or miss” manner. But with care it is possible to wire an audio studio so that it is free from ground loops (which induce hum and can cause oscillation) and provides maximum protection from power faults. In an ideal system: All units in the system should have balanced inputs. In a modern system with low output impedances and high input impedances, a balanced input will provide common-mode rejection and prevent ground loopsregardless of whether it is driven from a balanced or unbalanced source. (The 222A has balanced inputs.) All equipment circuit grounds should be connected to each other; all equip- ment chassis grounds must be connected together. Cable shields should be connected at one end onlypreferably the source (output) end. Power Ground: Ground the 222A chassis through the third wire in the power cord. Proper grounding techniques require the equipment chassis to be connected to power/earth ground at all times. A proper power ground is essential to safe operation. Lifting a chassis from power ground creates a potential safety hazard. Circuit Ground: To maintain the same potential in all equipment, the circuit (audio) grounds must be connected to one another: In a simple one-studio system, the connection through power ground (via the third wire of the power cord) will suffice. Connect the 222As circuit ground ( ) terminal to its chassis ground () terminal. Also connect the circuit and chassis grounds of other equipment. In larger systems, it is common to establish an isolated circuit ground sys- tem that is insulated from the power ground except at one point (usually the studio power distribution panel). In this case, disconnect the 222As circuit ground ( ) terminal from its chassis ground () terminal, then connect the 222As circuit ground ( ) terminal to the isolated circuit ground system. Audio Output: To maintain the same potential in all equipment, the circuit (audio) grounds must be connected to one another: Use two-conductor shielded cable (Belden 8451, or equivalent). At the 222As output (and at the output of other equipment in the system), connect the cables shield to () terminal for that channel. connect the rd (or white) wire to the channels HI terminal, and the black wire to the chan- nels LO terminal. In difficult environments it may be necessary to isolate the 222B with out- put transformers. 5-2 TROUBLESHOOTING Orban Model 222A Problems and Possible Causes Always verify that the problem is not in the source material being fed to the 222A, or in other parts of the system. RFI, hum, clicks or buzzes: A grounding problem is likely. Review the information on grounding in Section 2. The 222As moderate RF suppression should be adequate for the vast majority of instal- lations. However, installation next to a high-power transmitter may still cause problems. Additional RF suppression, careful examination of the grounding scheme, and other techniques familiar to the broadcast engineer may have to be employed. It may help to install output transformers. Power supply problems: The voltage regulators are operated conservatively, and can be expected to be extremely reliable. Before replacing the regulators check to see whether other abnormalities in the circuitry (such as a shorted IC) may have caused excessive current demand. This sce- nario would in turn cause the regulator ICs to either current limit or go into thermal shutdown (the two built-in protective modes). If it becomes necessary to replace a regu- lator, ensure that you replace its heat dissipater securely. Regulators IC50 and IC51 are frequency-compensated by C52, and C53 at their outputs, to prevent high-frequency oscillations. If C52 or C53 ever needs to be replaced, a low- inductance aluminum electrolytic must be used. A tantalum can fail if the dielectric is punctured momentarily, thereby triggering the current-delivering capacity of the power supply to cause a runaway condition. A high-inductance aluminum can fail to prevent a regulator from oscillating. Check for oscillation on the power bus with an oscilloscope whenever C52 or C53 has been replaced. Output module failure: The 5532 and 411 opamps used in the balanced output module may be freely replaced as necessary. However, the circuit is extremely sensitive to the characteristics of the resistors, so while resistor failure is unlikely, field repair requires replacement of the entire output module in question in order to maintain adequate headroom and common- mode rejection (see page 5-4 for information on factory service). Pumping or other misbehavior of subsequent audio processing: The 222A will increase peak levels during attack transients. Orbans OPTIMOD audio processors will handle these increased peak levels without introducing artifacts. How- ever, we obviously cannot guarantee that every make of audio processor will perform as gracefullyespecially if it is an older, single-band design or if it employs fast attack times. If you have problems, you might consider upgrading to Orban processing. 6-2 TECHNICAL DATA Orban Model 222A Specifications Performance Frequency response: 0.25dB, 20-20,000Hz. Total harmonic distortion shipping weight is 10 lbs (4.5 kg). Power requirements: 115/230 VAC 10%, 50-60Hz, 9VA; three-wire power cord at- tached. Fuse: A 250V Slo-Blo for 115V or 230V operation. 3AG or “T” type as appropriate. Operating temperature range: 32-113F (0-45C). Humidity: 0-95% relative humidity, non-condensing. Warranty: One year, parts and labor: Subject to the limitations set forth in Orbans Standard Warranty Agreement. Specifications subject to change without notice.