Hafler 9180 9270 Service Manual

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NOTICE - IMPORTANT SAFETY INFORMATION WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. The lightning flash with arrowhead symbol withinan equilateral triangle is intended to alert theuser 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 equilateraltriangle is intended to alert the user of the presence of important operating and mainte- nance (servicing) instructions in the literature accompanying the appliance. 1. READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment shoul\ d be read before power is applied to the equipment. 2. RETAIN OWNERS MANUAL These safety and operating instructions should be retained for future re\ ference. 3. HEED WARNINGS All warnings on the equipment and in the operating instructions are impo\ rtant and should be followed. 4. FOLLOW INSTRUCTIONS All operating and use instructions are important and should be followed.\ 5. HEAT The equipment should be kept away from areas of high temperature, such a\ s heater vents, radiators, stoves/ovens, fireplaces, etc. 6. VENTILATION The equipment should be used in an area suitable for proper ventilation.\ Care should be taken not to impede airflow in and around the cabinet. Do not mount on a carpeted shelf or in a seal\ ed enclosure. Allow for proper clearance above the equipment. 7. 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 be used in areas prone to flooding, such as a basement. a.a. POWER SOURCES The equipment should be connected only to a power source of the same vol\ tage and frequency as that listed on the rear panel above the power cord entry point. 9. POWER CORD PROTECTION Power cords should be arranged so that they do not interfere with the mo\ vement 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 cor\ ner, etc. 10. POWER CORD GROUNDING The power supply cord is of a three wire grounded type, designed to redu\ ce the risk of electric shock sustained from a live cabinet. It is assumed to be of suitable length for most uses of the equipment. T\ he use of extension cords and power strips is discouraged unless they are of suitable rating to delive\ r 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 fu\ lly insert into the mating receptacle. Never remove the round grounding pin on the plug in an attem\ pt to mate to a two wire ungrounded receptacle: use a grounding adaptor with the grounding tab or wire suita\ bly connected to earth ground. -1-

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11. NON-USE PERIODSDuring periods of extended non-use, the power cord should be unplugged f\ rom the power source. 12. CLEANING The equipment should be cleaned only as detailed in the operating instru\ ctions. 13. OBJECT AND LIQUID ENTRY Care should be taken so that objects and/or liquids, such as cleaning fl\ uids or beverages, are not spilled into the enclosure of the equipment. 14. DAMAGE REQUIRING 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, o\ r C. The equipment has been exposed to rain, or D. The equipment does not appear to operate normally or exhibits a marke\ d 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 i\ s described in the operating instructions. All other service should be referred to qualified service personnel. 16. CARTS AND STANDS The equipment should be used with carts or stands only of sufficient str\ ength 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 equipment and cart combination to topple. -2-

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TABLE OF CONTENTS PERFORMANCE SPECIFICATIONS ........................................................................\ .................. 4 General Information ........................................................................\ ...................................... 4 INSTALLATION Rackmounting.. ........................................................................\ .............................................. 5 Ventilation/Placement.. ........................................................................\ ................................. 5 Line Voltage.. ........................................................................\ ................................................. 5 OPERATION/CONNECTIONS Power Cord Connection/Power Switch.. ........................................................................\ ....... 5 Inputs ........................................................................\ ............................................................. 5 Front Panel View Diagram.. ........................................................................\ .......................... 6 Rear Panel View Diagram ........................................................................\ ............................ 7 Outputs ........................................................................\ .......................................................... 8 Gain Controls.. ........................................................................\ .............................................. 8 Mono/Stereo Switching. . ........................................................................\ ............................... 8 Soft Turn-On System ........................................................................\ .................................... 8 Thermal Protection System ........................................................................\ .......................... 8 CIRCUIT HIGHLIGHTS ........................................................................\ ....................................... 9 ADDITIONAL INFORMATION Loudspeaker Load Impedance Considerations ................................................................... 10 Changing LineVoltage Rating ........................................................................\ ..................... 10 Adjusting Bias ........................................................................\ .............................................. 10 General Troubleshooting Hints........................................................................\ .................... 11 Ground Loops ........................................................................\ .............................................. 1 1 Cleaning/Maintenance ........................................................................\ ................................ 12 Parts List..........................................................................\ .................................................... 12 Functional Block Diagram.. ........................................................................\ ......................... 14 Component Layout Diagram.. ........................................................................\ ..................... 15 Circuit Schematic Diagram ........................................................................\ ......................... 17 SERVICE POLICY AND LIMITED WARRANTY. . ..................................................................... 19 -3-