Rotel-RA-921-OM 电路图 维修手册.pdf

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1、RA921 Stereo Integrated Amplifier OWNERS MANUAL Please write the serial number, date of purchase and the name of Rotelhi fi Authorized Dealer in the spaces provided for your future reference. Serial number .Purchase date . Rotel hi fi Authorized Dealer .THE ROTEL CO., LTD. SHINSEN-BLD. 4F 10-10 SHIN

2、SEN-CHO, SHIBUYA-KU, TOKYO 150, JAPAN Y-298A-E-9710F/S-RG 082OMRA-921 PRINTED IN JAPAN RadioFans.CN 收音机爱 好者资料库 SAFETY INSTRUCTIONS Explanation of Graphical Symbols The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert you to the presence of uninsulated dange

3、rous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert you to the presence of important operating and maintenance (servicing) instructions in the lite

4、rature accompanying the appliance. 1 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER(OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. APPLICABLE FOR USA, CANADA OR WHERE APPROVED TO THE USAGE CAU

5、TION : TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE PLUG TO WIDE SLOT, INSERT FULLY . ATTENTION : POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND. 1. Read Instructions - All the safety and operating inst

6、ructions should be read before the appliance is operated 2. Retain Instructions - The safety and operating instructions should be retained four for future reference. 3. Head Warnings - All warnings on the appliance and in the operating instructions should be adhered to. 4. Follow Instructions - All

7、operating and other instructions should be followed. 5. Water and Moisture - The appliance should not be used near water - for example, near a bathtub, washbowl, kitchen sink, Iaundry tub, in a wet basement, or near a swimmingpool, etc. 6. Carts and Stands - The appliance should be used only with a

8、cart or stand that is recommended by the manufacturer. PORTABLE CART WARNING S3125A 7. Wall or Ceiling Mounting - The appliance should be mounted to a wall or ceiling only as recommended by the manufacturer. 8. Ventilation - The appliance should be situated so that its location or position does not

9、interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openin

10、gs. 9. Heat - The appliance should be situated away from heat sources such as radiators, stoves, or other appliances that produce heat. 10. Power Source - The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance. 11. P

11、ower-Cord Protection - Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance. 12. Cleaning - The applian

12、ce should be cleaned only as recommended by the manufacturer. 13. Nonuse Periods - The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time. 14. Object and Liquid Entry - Care should be taken so that objects do not fall into and liquids not spill

13、ed into the inside of the appliance. 15. Damage Requiring Service - The appliance should be serviced by qualified service personnel when: A. The power-supply cord or the plug has been damaged; or B. Objects have fallen, or liquid has been spilled into the appliance; or C. The appliance has been expo

14、sed to rain; or D. The appliance does not appear to operate normally or exhibits a marked change in performance; or E. The appliance has been dropped, or the cabinet damaged. 16. Servicing - The user should not attempt to service the appliance beyond those means described in the operating instructio

15、ns. All other servicing should be referred to qualified service personnel. - The precautions that should be taken so that the grounding or polarization means of an appliance is not defeated. POOR, DULL SOUND ARE THE HEADS DIRTY? HEADS MAGNETIZED FROM LONG WOW easy to use and to have high fidelity to

16、 the original sound. Please read this owners manual to ensure that your amplifier is properly installed and able to offer optimum performance. We appreciate being a part of your life. FEATURES This stereo integrated amplifier has been designed for high performance. It has symmetrical circuit path, u

17、tilized to ensure absolutely identical timing integrity between the two channels of the amplifier. The power supply derives from a ROTEL designed power transformer. We also utilize ROTEL custom designed capacitors to improve the speed and damping factor of the amplifier. We believe in highly regulat

18、ed power supplies and build these into all of our products. We feel the extra expense of building in an excellent power supply is worthwhile because it is good for the music. INSTALLATION Please place the unit on a DRY, level surface away from direct sunlight. Avoid placing objects on top of the RA

19、921 that will block the cooling vents, as they may cause the amplifier to overheat. If the amplifier is mounted inside a cabinet, please be certain that there is adequate airflow to ensure proper cooling. Do not allow water or objects to fall into the amplifier, as these will damage the circuitry. A

20、void installing the amplifier in a location where excessive humidity, vibration or moisture will be a problem. We recommend installing the amplifier in furniture designed to house Hi Fi components. This will allow the amplifier to be on a separate shelf with nothing stacked on top of it. This will m

21、inimize heat and potential interference from other components in your system. Component furniture will also reduce or suppress vibration and all audio components will provide improved sound when free from vibration. Ask your ROTELhi fi Authorized Dealer for advice about component furniture and prope

22、r installation of audio components. ELECTRICAL REQUIREMENTS AND CLEANING This amplifier is designed to work on AC voltage and the correct voltage is displayed on the Back Panel. Do not attempt to operate the amplifier on incorrect voltage as this will damage the circuitry and will void your warranty

23、. If you are in doubt about the correct voltage for this amplifier we suggest that you please read the label on the back panel, the label on the packing carton or consult with your ROTELhi fi Authorized Dealer for confirmation of the correct voltage. Connect the Power Cord to your wall socket for AC

24、 power. We strongly recommend that the amplifier be connected to the mains wall socket, not an extension cord, for best sound quality. When you wish to disconnect the power cord from the wall always grasp the plug firmly and then pull it out of the wall socket. Do not unplug the power cord from the

25、wall by pulling the cord only. This may damage the power cord and create a hazardous condition. If you wish to clean the cabinet, we suggest that you clean it with a soft, DRY cloth. Never use cleaning compounds or solvents to clean the cabinet as they may damage the finish or remove the labels. Thi

26、s could also damage the circuitry if any liquid or residue falls inside the amplifier. 2 RadioFans.CN 收音机爱 好者资料库 There is NO user serviceable part inside the RA 921. Please do not open the cabinet, as this will expose you to the risk of potentially dangerous high voltage and the risk of shock. This

27、could also damage the circuits and possibly void your warranty. FRONT PANEL CONTROLS We have designed this integrated amplifier to be easy to use. The controls are simple but comprehensive. The POWER button will turn the amplifier ON and OFF. Push it in and the amplifier will turn ON. The POWER indi

28、cator light will illuminate at the same time. If you push the POWER button again the amplifier will go OFF and the power indicator light will extinguish. We have included a speaker disconnect function in the HEADPHONE jack on this amplifier. When headphones are plugged into the front panel headphone

29、 jack, the speakers are automatically disconnected. If you have headphones with a 3.5 mm mini plug you should ask your ROTELhi fi Authorized Dealer for an adapter plug to convert them for use with the headphone jack on the RA 921. To adjust the bass and treble content of the music, please use the fr

30、ont panel BASS and TREBLE controls. Turning the BASS or TREBLE controls to the right will increase the bass or treble. Turning the controls to the left will decrease the bass or treble. The VOLUME control will allow you to turn the LEFT (L) and RIGHT (R) channels of music up or down in level at the

31、same time. Rotation clockwise will increase the volume, rotation counterclockwise will decrease the volume. Adjust the BALANCE by turning it left or right, to shift the apparent center of the image or to center the sound from an out of balance signal. The MONITOR selector switch will allow you to ch

32、oose the source (normal operation) or to listen to a recording during playback. If you have a 3-head cassette deck, 3-head reel to reel tape deck or a DAT recorder capable of reading and writing at the same time, the MONITOR switch will allow you to immediately compare the source to the recording in

33、 progress. The FUNCTION selector switch will select the source that you wish to hear. We have provided inputs for PHONO, CD, TUNER, and AUX. BACK PANEL CONNECTIONS The back panel has INPUT, OUTPUT and SPEAKER terminals for connecting source components and speakers in your stereo system. The INPUTS a

34、re clearly labeled. The LEFT and RIGHT channels are clearly designated. Please be certain that the LEFT channel and RIGHT channel connections are not 3 reversed. This will not harm anything but it will make the orchestra sound backwards for classical music fans. AUX will be ideal for the connection

35、of a stereo TV monitor with audio output jacks, a DVD player, a hi fi video tape recorder, a Laser Disc player, a CD-ROM or DVD ROM drive. The CD and TUNER connections are clearly labeled for your convenience. PHONO connections are for a moving magnet (MM) phono cartridge. A ground terminal is inclu

36、ded for your turntables phono cable to minimize hum in the phono signal. The phono section is designed for use with a moving magnet phono cartridge. Please do not connect a CD player, tape deck or other line level component to this input. The TAPE connections have IN and OUT connections. These are t

37、o send a signal to (OUT) the recorder and then to receive a signal back from (IN) the recorder. Check all connections and read the owners manual for your recorder if you are in doubt about the labels. The SPEAKER terminals will accept one pair of speakers. Speakers with rated impedance of 4 to 8 ohm

38、s will work well with the RA 921. Speakers rated for higher than 8 ohms impedance will also work well but these are not very common. You may connect the speakers with bare wire or banana plugs. (Non CE mark models) Please be certain to observe the correct polarity of the wires as well as the left an

39、d right channel connections. The RED (+) speaker terminals are to be connected to the RED or POSITIVE terminals on your speakers. The BLACK (-) speaker terminals are to be connected to the black or negative terminals on your speakers. If you make these connections incorrectly you will have a vague s

40、tereo image and very little bass response from your speakers. If you are in doubt about the sound when listening then you should reverse the positive and negative connections on the back of one speaker only. If the stereo image becomes more specific and the apparent bass response improves, the speak

41、er connections should be rechecked to ensure correct connection. You may also confirm this by placing the speakers face to face 75 mm apart (3 ) and playing music with strong bass content as a source. The connection that has the most bass output is the correct connection. When connected in this way,

42、 the incorrect connection will have very little sound output as each of the two speakers will attempt to cancel the sound the other is making due to the opposite polarity and movement of the drivers. If you connect your speakers with bare wire, strip approximately 1 1/2 mm (1/2 ) of the insulation f

43、rom the end of the wire and connect to the terminal of the amplifier by turning it around the center post of the speaker terminal. The speaker terminal knob should be turned counterclockwise to extend the terminal for connecting. When you have wrapped the wire around the post, tighten the speaker te

44、rminal by turning the knob clockwise to grasp the wire FIRMLY. Ensure that NO LOOSE WIRE is outside the terminal housing. Repeat this operation for all the terminals. If you use Banana plugs they may be connected to the end of the speaker terminals by pushing them into the holes provided. HUM AND NO

45、ISE IN A STEREO SYSTEM In any high fidelity stereo installation it is possible for noise to be created by the physical location of some of the components. If your system has hum or excessive noise it is possible to diagnose this before trying to have repairs made to a properly functioning component.

46、 If the system only hums with one source component then it should be unplugged from the system. Turn the VOLUME down or turn the POWER off before you unplug the suspected component. If the system still hums after the suspected component has been removed, you may require service. First though, you sh

47、ould disconnect all the other components, except the speakers. If there is no hum after this, something in the system is either in need of physical relocation or repair. Connect the components one by 4 INTEGRATED AMPLIFIER MODEL NO.RA-921 POWER CONSUMPTION:180W PHONOCDTUNERAUXTAPE LEFT RIGHT + RIGHT - - LEFT + SPEAKERS AVIS:RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN INOUT SPEAKER IMPEDANDE 4 OHMS MINIMUM W A R N I N G :TO REDUCE THE RISK OF THE FIRE OR ELECTRICAL SHOCK. DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. ROTEL ELECTRONICS CO., LTD POWER