Rotel-RX-975-OM 电路图 维修手册.pdf

Owners Manual RX-975 AM/FM Stereo Receiver RadioFans.CN 收音机爱 好者资料库 2RX-975 AM/FM Stereo Receiver WARNING: There are no user serviceable parts inside. Refer all servicing to qualified service personnel. WARNING: To reduce the risk of fire or electric shock, do not expose the unit to moisture or water. Do not allow foreign objects to get into the enclosure. If the unit is exposed to moisture, or a foreign object gets into the enclosure, immediately disconnect the power cord from the wall. Take the unit to a qualified service person for inspection and necessary repairs. Read all the instructions before connecting or operating the component. Keep this manual so you can refer to these safety instructions. Heed all warnings and safety information in these instruc- tions and on the product itself. Follow all operating instruc- tions. Clean the enclosure only with a dry cloth or a vacuum cleaner. You must allow 10 cm or 4 inches of unobstructed clearance around the unit. Do not place the unit on a bed, sofa, rug, or similar surface that could block the ventilation slots. If the component is placed in a bookcase or cabinet, there must be ventilation of the cabinet to allow proper cooling. Keep the component away from radiators, heat registers, stoves, or any other appliance that produces heat. The unit must be connected to a power supply only of the type and voltage specified on the rear panel of the unit. NOTE TO CATV SYSTEM INSTALLER: Call the CATV system or antenna installers attention to Ar- ticle 820-40 of the NEC. This provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the pint of cable entry as practical. See installa- tion diagram. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against interference in a residential installation. This equipment generates and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause interference to radio or TV commu- nications. There is no guarantee that interference will not occur in a particular installation. If this equipment does cause in- terference to radio or television reception, which can deter- mined by turning the equipment off and on, try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the unit and the televi- sion tuner. Connect the unit to an AC power outlet on a different elec- trical circuit. Consult your authorized Rotel retailer for assistance. Connect the component to the power outlet only with the sup- plied power supply cable or an exact equivalent. Do not modify the supplied cable in any way. Do not attempt to defeat ground- ing and/or polarization provisions. Do not use extension cords. Do not route the power cord where it will be crushed, pinched, bent at severe angles, exposed to heat, or damaged in any way. Pay particular attention to the power cord at the plug and where it exits the back of the unit. The power cord should be unplugged from the wall outlet if the unit is to be left unused for a long period of time. Immediately stop using the component and have it inspected and/or serviced by a qualified service agency if: The power supply cord or plug has been damaged. Objects have fallen or liquid has been spilled into the unit. The unit has been exposed to rain. The unit shows signs of improper operation The unit has been dropped or damaged in any way Place the unit on a fixed, level surface strong enough to sup- port its weight. Do not place it on a moveable cart that could tip over. RadioFans.CN 收音机爱 好者资料库 3 Figure 1: Controls and Connections English RadioFans.CN 收音机爱 好者资料库 4RX-975 AM/FM Stereo Receiver 38 32 31 33 39 34 35 36 37 Figure 2: RR-949 Remote Control Figure 3: Antenna Connections 5 Figure 4: Input Connections English 6RX-975 AM/FM Stereo Receiver Figure 5: Output Connections 7 Contents Figure 1: Controls and Connections3 Figure 2: RR-949 Remote Control4 Figure 3: Antenna Connections4 Figure 4: Input Connections5 Figure 5: Output Connections6 About Rotel .8 Getting Started .8 Unpacking8 Placement8 Main Operating Controls.8 Power Switch and Standby Switch 8 Remote Sensor 9 Front Panel Display 9 Master Volume 9 Tone Controls 9 Balance Control 9 Headphones Jack 9 Speaker Button and Speaker LEDs 9 MEMORY Button 9 Input Source Buttons 9 Tuning Controls .10 BAND Button 10 TUNING Button 10 NUMERIC Buttons: Station Presets 10 FREQUENCY DIRECT Button 10 MONO Button 10 RR-949 Remote Control .11 AUDIO Button 11 Programming the RR-94911 POWER Button 11 VOLUME Buttons 11 SHIFT Button 11 MUTE Button 11 PRESET AUTO SCAN Button SHIFT MUTE 11 TV/BAND Button 11 TUNE/PRESET Button SHIFT TV/BAND 11 CH TUNING Buttons 11 INPUT SOURCE Buttons 12 NUMERIC Buttons 12 Rear Panel Connections .12 Phono Inputs and Phono Ground 12 CD Inputs 12 Tape Inputs and Outputs 12 VIDEO 1 Inputs/Outputs 12 VIDEO 2 5 Inputs 12 TV Monitor Output 12 Speaker Outputs 12 Preamp Inputs/Outputs 13 Antenna Connections .13 AM Loop Antenna 13 FM Wire Antenna 13 AC Power Connections.14 AC Input 14 AC Convenience Outlet USA version only14 Remote External Sensor 14 Specifications .15 Audio15 Video15 FM Tuner15 AM Tuner15 General15 English 8RX-975 AM/FM Stereo Receiver About Rotel A family whose passionate interest in mu- sic led them to manufacture high fidelity com- ponents of uncompromising quality founded Rotel over 30 years ago. Through the years that passion has remained undiminished and the family goal of providing exceptional value for audiophiles and music lovers regardless of their budget, is shared by all Rotel em- ployees. The engineers work as a close team, listen- ing to, and fine tuning each new product until it reaches their exacting musical stan- dards. They are free to choose components from around the world in order to make that product the best they can. You are likely to find capacitors from the United Kingdom and Germany, semi conductors from Japan or the United States, while toroidal power trans- formers are manufactured in Rotels own factory. Rotels reputation for excellence has been earned through hundreds of good reviews and awards from the most respected review- ers in the industry, who listen to music ev- ery day. Their comments keep the company true to its goal - the pursuit of equipment that is musical, reliable and affordable. All of us at Rotel, thank you for buying this product and hope it will bring you many hours of enjoyment. Getting Started Thank you for purchasing the Rotel RX-975 AM/FM Stereo Receiver. The RX-975 is three products in one: 1. A full-featured audio/video control cen- ter for analog audio and video source components 2. A high-quality AM/FM tuner with 30 station presets, direct access tuning, and auto-tuning. 3. A high power 2-channel amplifier. Rotels Balanced Design Concept combines advanced circuit board layout, comprehen- sive parts evaluation, and extensive listen- ing tests for superior sound and long term reliability. We are confident that you will en- joy the high performance of your Rotel RX-975 for years to come. In addition, the RX-975 includes a univer- sal remote control that is factory programmed operate the RX-975 and can be programmed to operate up to seven other components of your choice, providing the convenience of whole-system control from a single remote. Unpacking Remove the unit carefully from its packing. Look for the handheld remote control and other accessories. Save the packing and box as it will protect the RX-975 if you move or need to return it for maintenance. Placement Place the RX-975 on a solid, dry, level sur- face away from direct sunlight, excessive heat, high humidity, or strong vibrations. The RX-975 can generate considerable heat during normal operation. Do not block its ventilation openings. Allow a minimum of 10 cm (4 inches) of unobstructed open space around the unit. If installed in a cabinet, make sure that there is adequate ventilation. Make sure the RX-975 is close to the other components in your audio/video system and, if possible, place it on its own shelf. This will make initial cable routing, hookup, and any subsequent system changes easier. It also minimizes potential interference or heat buildup from other components. Make sure there is enough room behind the RX-975 for easy hookup. Remember, you are connecting many other components to this unit and youll probably need more space than you think. Dont stack other objects (components or other items) on top of the RX-975. Dont let water fall into the RX-975 as this could dam- age delicate circuitry. Main Operating Controls We suggest you look over the RX-975s front and rear panels before you start connect- ing other components to it. The following ex- planations will help you get familiar with the units connections, features, and controls, with number references corresponding to the il- lustrations at the front of this manual. Most functions are duplicated on the front panel and on the remote control shipped with your unit. A few may be available only on one or the other. When two reference num- bers appear, one refers to the location of the button on the front panel, the other to the location of the button on the handheld remote control. NOTE: Front panel controls and displays used for tuning the AM/FM receiver are de- scribed in the next section of this manual. POWER Switch and STANDBY Switch The RX-975 has two pushbuttons for pow- ering on and off. The POWER switch com- pletely shuts down all of the circuitry, simi- lar in effect to removing the power cord from the AC outlet. The STANDBY switch deacti- vates the unit, but preserves power to some circuits such as those that store memorized circuits. When in STANDBY mode, a front panel STANDBY LED indicator lights. The STANDBY switch is duplicated on the RX-975s remote. 9 In normal operation, use the STANDBY switch to deactivate the unit when you are finished listening and leave the POWER switch ON at all times. This will preserve memory func- tions. NOTE: The STANDBY switch also controls the rear panel AC outlets. When the RX-975 is in STANDBY mode, the AC outlet is also off. When the RX-975 is fully functional, the AC outlet is live. Remote Sensor This sensor receives infrared signals from the handheld remote control. Make sure you do not accidentally block this sensor with cables or accessories. Front Panel Display The large fluorescent display in the upper portion of the RX-975 provides status infor- mation used in operating the AM/FM re- ceiver (such as station frequency display, band, preset memory, etc.). MASTER VOLUME The MASTER VOLUME control adjusts the level of all output channels simultaneously. Rotate the control clockwise to increase the volume. Rotate counterclockwise to decrease the volume. MASTER VOLUME buttons are also available on the RX-975s handheld re- mote control. When you adjust the volume, a bar indica- tor in the display shows the volume setting. TONE Controls BASS and TREBLE controls increase and decrease the audio signals low and high frequency content respectively. Rotate clock- wise to increase output in the respective fre- quency range and counterclockwise to re- duce it. The center detent removes each control from the audio path for maximum signal integrity. BALANCE Control Turn the BALANCE control clockwise to in- crease the output level of the right channel speakers. Turn counterclockwise to increase the output level of the left channel speakers. The center detent position removes the control from the circuit and provides equal output from both left and right channels. HEADPHONES Jack This jack accepts a standard 1/4 inch ste- reo headphone plug. Use an adaptor if your headphones have the smaller mini-plug. Inserting a headphone plug will automati- cally disable all speaker outputs. SPEAKER Button and SPEAKER LEDs The RX-975 provides output connections for two pairs of speakers: A and B. The SPEAKER BUTTON controls which pairs of speakers outputs, if any, are active. A pair of SPEAKER LED indicators located to the left of the DIS- PLAY shows the current speaker selection. Press the SPEAKER button repeatedly to step sequentially through the four available speaker options: Speakers A active (LED A only lit) Speakers B active (LED B only lit) Speakers A and B active (both LEDs lit) All speakers off (no LEDs lit) NOTE: Inserting a headphone plug into the headphone jack disables all speaker out- puts, regardless of the SPEAKER button set- ting. MEMORY Button The MEMORY button is used to confirm and memorize tuner station presets. Its use is described in detail in the Tuning Controls sec- tion of this manual. Input Source Buttons Ten large front panel buttons directly select an audio or video input source (such as a CD player, the built-in tuner, a tape recorder, video sources, etc.) for listening. Push any of these buttons (or the duplicates on the handheld remote) to select the desired source. You will hear this source and, if you have selected a video source, see its picture on your TV monitor. The front panel display will show the current source selection. TAPE MONITOR Buttons: Two of the IN- PUT SOURCE buttons have a special func- tion. The TAPE 1 and TAPE 2 MONITOR buttons activate the audio inputs of a tape monitor loop consisting of a pair of outputs and a matching set of inputs. Normally, this tape monitor loop is used to play a tape deck connected to these inputs or for real time monitoring of a recording in progress on an audio tape deck. Alternatively, the tape monitor loop could be used to pass a sig- nal to a graphic equalizer and listen to the processed signal by pressing the correspond- ing TAPE MONITOR button. An indicator ap- pears in the front panel display when TAPE 2 MONITOR is activated. English 10RX-975 AM/FM Stereo Receiver Tuning Controls The RX-975 features a digital synthesized AM/FM tuner with 30 station presets. Op- eration of the tuning functions involves the use of a row of numeric buttons and five large buttons below the MASTER VOLUME knob. BAND Button The BAND button selects whether the tuner is in AM or FM mode. Press the button to toggle back and forth between AM and FM. A corresponding indicator will light at the left portion of the front panel display to confirm your choice and the currently tuned station frequency will be shown. TUNING Button This rocker switch (or pair of buttons labeled CH UP/DOWN on the remote control