Hafler-915-pre-sm维修电路原理图.pdf

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1、Haflee H O M EA U D I O C O M P O N E N T S Series 0915 P R E A M P L I F I E R RadioFans.CN 收音机爱 好者资料库 Series 915 Preamp NOTICE - IMPORTANT SAFETY INFORMATION RISK OF ELECTRIC SHOCK 00 NOT OPEN WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. A A I 0 The l

2、ightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous voltage” within the products enclosure, that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an e

3、quilateral triangle is intended to alert the user of the presence of important operating and mainte- nance (servicing) instructions in the literature accompanying the appliance. 1. 2. 3. 4. 5. 6. 7. 8. 9. READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment should be

4、read before power is applied to the equipment. RETAIN OWNERS MANUAL These safety and operating instructions should be retained for future reference. HEED WARNINGS All warnings on the equipment and in the operating instructions are important and should be followed. FOLLOW INSTRUCTIONS All operating a

5、nd use instructions are important and should be followed. HEAT The equipment should be kept away from areas of high temperature, such as heater vents, radiators, stoves/ovens, fireplaces, etc. VENTILATION The equipment should be used in an area suitable for proper ventilation. Care should be taken n

6、ot to impede airflow in and around the cabinet. Do not mount on a carpeted shelf or in a sealed enclosure. Allow for proper clearance above the equipment. WATER AND MOISTURE The equipment should not be used in or around water, such as a bathtub, sink, or swimming area. Also, the equipment should not

7、 be used in areas prone to flooding, such as a basement. POWER SOURCES The equipment should be connected only to a power source of the same voltage and frequency as that listed on the rear panel above the power cord entry point. POWER CORD PROTECTION Power cords should be arranged so that they do no

8、t interfere with the movement of objects in the room: people, fan blades, utility carts, etc. Also, care should be taken that the cord is not pinched or cut, and placed so that it is not in danger of being pinched or cut, as in under a rug, around a tight corner, etc. 10. POWER CORD GROUNDING The po

9、wer supply cord is of a three wire grounded type, designed to reduce the risk of electric shock sustained from a live cabinet. It is assumed to be of suitable length for most uses of the equipment. The use of extension cords and power strips is discouraged unless they are of suitable rating to deliv

10、er the required total current for safe operation of all connected equipment. Furthermore, extension cords or power strips must provide the same three wire grounded connection.It is important that the blades of the equipments plug be able to fully insert into the mating receptacle. Never remove the r

11、ound grounding pin on the plug in an attempt to mate to a two wire ungrounded receptacle: use a grounding adaptor with the grounding tab or wire suitably connected to earth ground. -l- RadioFans.CN 收音机爱 好者资料库 11. NON-USE PERIODS During periods of extended non-use, the power cord should be unplugged

12、from the power source. 12. CLEANING The equipment should be cleaned only as detailed in the operating instructions. 13. OBJECT AND LIQUID ENTRY Care should be taken so that objects and/or liquids, such as cleaning fluids or beverages, are not spilled into the enclosure of the equipment. 14. DAMAGE R

13、EQUIRING SERVICE Hafler equipment should be serviced by qualified service personnel when: A.The power supply cord or plug has been damaged, or B.Objects have fallen, or liquid has been spilled into the equipment, or C.The equipment has been exposed to rain, or D.The equipment does not appear to oper

14、ate normally or exhibits a marked change in performance, or E.The equipment has been dropped, or the enclosure has been damaged. 15. SERVICING The user should not attempt to service the equipment beyond that which is described in the operating instructions. All other service should be referred to qu

15、alified service personnel. 16. CARTS AND STANDS The equipment should be used with carts or stands only of sufficient strength and stability for the use intended. An equipment and cart combination should be moved with care. Quick stops and starts, excessive force, and uneven surfaces may cause the eq

16、uipment and cart combination to topple. -2- RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS PERFORMANCE SPECIFICATIONS. 4 General Information . 5 INSTALLATION Rackmounting . 5 Ventilation/Placement. 5 Line Voltage . 5 OPERATION/CONNECTIONS Power Cord Connection .5 Initial Power-Up/Muting System .5 Conveni

17、ence Outlets .6 Line Level Inputs . 6 Phono Section . 6 Front Panel View Diagram . 7 Rear Panel View Diagram .8 Tape Input/Record Output . 9 Tone Controls/Tone Switch . 9 Volume Control . 9 Balance Control . 9 Out 1, Out 2, And Output Switch . 10 Headphone Output . 10 CIRCUIT DESCRIPTION Phono Secti

18、on. 10 Line LevelInpu?Selector System . 10 J-FET Buffer And Record Output Driver. . 11 Tape Monitor Switching.11 Volume And Balance Controls.11 Line Amplifier. . 11 Tone Control System.11 Muting System . 11 Power Supply. 11 Headphone Amplifier . 12 ADDITIONAL INFORMATION Installing Phono Option . .1

19、2 Phono Board Installation Diagram . .13 Installing Cartridge Loads . .14 Changing Line Voltage Rating . .14 Cartridge Loads Installation Diagram . .15 General Troubleshooting Hints . .16 Ground Loops . .17 Cleaning/Maintenance . .17 Functional Block Diagram . .18 Main Board Parts List . .19 Main Bo

20、ard Component Layout Diagram .20 Main Board Circuit Schematic Diagram .21 Phono Board Parts List .22 Phono Board Component Layout Diagram . .23 Phono Board Circuit Schematic Diagram . .24 SERVICE POLICY AND LIMITED WARRANTY. .25 -3- RadioFans.CN 收音机爱 好者资料库 PERFORMANCE SPECIFICATIONS PHONO SECTION (M

21、easured At REC OUT) LINE AMPLIFIER (Measured at OUT 1 or OUT 2) HEADPHONE AMPLIFIER All specifications are for 20 Hz - 20 kHz unless specified otherwise. FREQUENCY RESPONSE: +/-0.1 dB MAXIMUM OUTPUT: 5 volts RMS TOTAL HARMONIC DISTORTION AND NOISE: Moving Magnet: .002% Moving Coil: .009% SENSITIVITY

22、 (For 0.5 volts RMS at REC OUT, 1 kHz): Moving Magnet: 6.0 mV RMS Moving Coil: 600 uV RMS SIGNAL TO NOISE RATIO (A-weighted, relative to 0.5 V RMS at REC OUT): Moving Magnet: -87 dB Moving Coil: -80 dB MAXIMUM INPUT SIGNAL ( 1 kHz): Moving Magnet: 65 mV RMS Moving Coil: 6.5 mV RMS INPUT IMPEDANCE: N

23、ominal: 47,000 ohms Moving Magnet: 220 pF as supplied, user adjustable Moving Coil: 100 ohms as supplied, user adjustable GAIN ( 1 kHz): Moving Magnet: +38.5 dB Moving Coil: +58.5 dB FREQUENCY RESPONSE: +/- 0.1 dB (into 33,000 ohms) BANDWIDTH: 8 Hz - 170 kHz, -3 dB, into 10k ohm load MAXIMUM OUTPUT:

24、 6 volts RMS TOTAL HARMONIC DISTORTION AND NOISE: .008% 2 volts RMS SENSITIVITY (For 0.5 volts RMS Output): 45 mV RMS SIGNAL TO NOISE RATIO (A-Weighted, relative to 2 volts RMS output): -100 dB INPUT IMPEDANCE: 20k ohms (including PHONO/AUX1 when phono option not installed) OUTPUT IMPEDANCE: 316 ohm

25、s TONE CONTROLSBass: +/- 16 dB 20 Hz, moving inflection, variable turnover Treble: +/- 14 dB 20 kHz, shelving 5 kHz, fixed turnover MAXIMUM OUTPUT: 4 volts RMS into 150 ohm load OUTPUT IMPEDANCE: 150 ohms -4- RadioFans.CN 收音机爱 好者资料库 GENERALjINPUTS: Tuner, Video, CD, Phono/Aux 1, Aux 2, Tape Monitor

26、INFORMATION INSTALLATION OUTPUTS: Out 1, Out 2, Record Out, Headphone CONTROLS: input Selector, Volume, Tape Monitor , Tone Control In, Balance, Bass, Treble, Output Off, Power, Phono MM/MC INDICATORS: Mute/Standby, Power CONVENIENCE OUTLETS: 1 Unswitched, 4 Switched (Polarized) (Convenience Outlets

27、 are not included on 200-240 VAC units) PHYSICAL DIMENSIONS: 17” (W) x 7-5/8” (D) x l-3/4” (H) (excluding feet); Faceplate 17” or 19” (W). 43.2cm (W) x 19.4cm (D) x 4.5cm (H) (excluding feet); Faceplate 43.2cm or 483cm (W). POWER CONSUMPTION (Excluding Convenience Outlets): 9 watts Max. AC LINE VOLT

28、AGE OPERATING RANGE: (exceeding lower limit will activate muting circuit; exceeding upper limit will result in overheating and/or component damage) 100 - 120 Volt 50/80 Hz Models: 85 - 130 volts 200 - 240 Volt 50/80 Hz Models: 170 - 280 volts RACKMOUNTING VENTllATlON/ PLACEMENT LINE VOLTAGE The 915

29、Preamplifier is supplied in either a 17” Black Version, or a 19” Silver Version. The 19 model has rackmounting holes provided for installation in equipment racks. The holes are on standard EIA spacings. The 915 produces very little heat during operation, and therefore requires no special consider- a

30、tions for ventilation. The preamplifier should be located at least several inches away from components that contain large power transformers (such as power amplifiers), due to the possibility of audible hum or buzz from magnetic radiation. The 915 Preamplifier is configurable for either 100 - 120 vo

31、lt, or 200 - 240 volt operation. This is accomplished by changing internal jumpers on the printed circuit board. The procedure is detailed in the section “CHANGING LINE VOLTAGE RATING”. Make sure that the unit is configured for your local AC line voltage before attempted use. The configuration is la

32、belled directly above the power cord connector. OPERATION/CONNECTIONS POWER CORD CONNECTION INITIAL POWER- UP/MUTING SYSTEM Units wired for200-240 VACare supplied without power cords. Local agents will supply cords with male connectors appropriate to the local standard. Units wired for 100-120 VAC a

33、re supplied with a detachable AC power cord. The female connector plugs into the receptacle provided on the rear panel. This power cord is a standard IEC Type 320, 3-wire, 18 gauge assembly. Should replacement ever be necessary, be sure to replace it with an identical cord. Never remove the groundin

34、g pin from the male end of the cord. In applications where a grounded wall outlet is not available, a ground adaptor should be employed, with the ground tab or wire of the adaptor connected to a suitable earth ground. For units wired for 200-240 VAC, the front panel Power Switch controls the power t

35、o the Preamplifiers circuitry. If desired, this switch may be left “on” at all times to allow circuits to be thermally stabilized for maximum fidelity as soon as the system is used. -5- RadioFans.CN 收音机爱 好者资料库 IEC Type 320, 3-wire, 18 gauge CONVENIENCE Units wired for 200-240 VAC are supplied without convenience outlets to conform to Regulatory OUTLETSSafety requirements. LIN