Hafler 945 Series Owner'S Manual Download | Manualshive

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Summary of Contents for 945 Series

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Page 2: ...per 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 8 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 po...

Page 3: ...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 equipment and cart combination to topple 17 POWER LINES An outdoor antenna should be located away from power lines 18 OUTDOO...

Page 4: ...cator 1 4 Balance Control 1 4 Mono Control 1 4 Headphone Output 14 AM FM Tuner Section AM FM Selector 14 Up Down Tuning and Auto Selector 15 Memory Presets l 9 and 10 Preset Shift Front Panel 15 Memory Preset Buttons 1 1 1 and Next Remote Control 15 Storing Stations into Memory 15 Mono Control 1 5 CIRCUIT DESCRIPTION Line Level Input Selector System 1 6 JFET Buffer And Record Output Driver 16 Tape...

Page 5: ...nover MAXIMUM OUTPUT 4 volts RMS into 150 ohm load OUTPUT IMPEDANCE 150 ohms IHF USABLE SENSITIVITY Mono 6 5 dBf Stereo 12 dBf SIGNAL STRENGTH FOR 50 dB QUIETING Mono 11 dBf Stereo 34 5 dBf CAPTURE RATIO 1 5 dB AM SUPPRESSION 60 dB ALTERNATE CHANNEL SELECTIVITY 63 dB TOTAL HARMONIC DISTORTION AND NOISE 1 kHz Mono 0 08 Stereo 0 3 SEPARATION 40 dB 1 kHz SIGNAL TO NOISE RATIO 65 dBf Mono 75 dB Stereo...

Page 6: ...Local agents will supply cords with male connectors appropriate to the local standard Units wired for 120 VAC are 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 16 gauge assembly Should replacement ever be necessary be sure to replace it with an identical cord Never remove the grou...

Page 7: ... 16 15 16 15 RP P 1 4 1 4 P P 945 PREAMP TUNER FRONT PANEL VIEW ...

Page 8: ...19 20 TREBLE CONTROL RACKMOUNTING HOLES 19 version only VOLUME CONTROL INDICATOR shows rotational position of VOLUME CONTROL lights steady green for normal operation lights flashing green for MUTED operation press left button to change station frequency down press right button to change station frequency up in MANUAL mode each press of button increments frequency one channel spacing up or down in ...

Page 9: ...E VOLTAGE LINE OUT M R A OUTLETS RATING OUT IN 3 2 1 3 1 1 ANTENNA BRACKET Q RIGHT 1 O JT It 4 cL FM r 4 YANT CHANNEL Y A V O U T TAPE 2 EPL 75 OHM F M A N T 3 0 0 O H M I I UNSWITCHED L I N E C O R D OUTLET CONNECTOR 945 PREAMP TUNER REAR PANEL VIEW 120 VAC VERSION ...

Page 10: ...EO IN LINE OUT Mtf I R SWITCHED AC LINE VOLTAGE OUTLETS RATING OUT IN 3 2 1 3 2 1 R I G H T I CHANNEL ObT Ikl Y I I A V O U T CD FM ANT UNSWITCHED LINE CORD TAPE 2 EPL OUTLET CONNECTOR 3 0 0 O H M 945 PREAMPTTUNER REAR PANEL VIEW 240 VAC VERSION ...

Page 11: ...V 1 A V 2 or AN 3 Button on front panel lights green to indicate selected function 7 TAPE SELECTORS press to select TAPE 1 or TAPE 2 EPL Button on front panel lights red to indicate selected function See text for important operating details 8 POWER press to change between READY and ON mode Power switch on front panel lights amber when in READY mode green when in ON mode 9 AM FM press to change bet...

Page 12: ...VlMo co rJv1 BI zc si ti B i I7 vs I L L lr J L lr J L _ ___ f lll L _ ___ f lll L r m 1 5isE A A I I C M O S MoHo E m i j 945 PREAMP TUNER FUNCTIONAL BLOCK DIAGRAM ONE CHANNEL SHOWN ...

Page 13: ...roper operation of the Preamp Tuner s circuitry All selected operating modes that were set when the unit was turned off will resume when the power is turned on again It will not however remember some of the set operating modes if AC power is lost entirely Tuner Presets and selected inputs will be retained in memory for a few days PREAMPLIFIER SECTION The audio input jacks labelled CD AN1 A V2 and ...

Page 14: ...stem it is usually preferred to connect the processor to Tape 2 and the tape deck to Tape 1 This will prevent the processor from affecting signals sent to the tape deck If it is desired to affect signals sent to the tape deck then connect the devices in the opposite order If two signal processors are connected to the system then a decision must be made as to which device should come first in the s...

Page 15: ...ntrol is useful for balancing the acoustic output of the system between left and right speakers as well as being useful for system troubleshooting The Balance Control is not available from the Remote Control The Mono button converts stereo sources to monophonic or can be used to feed a monophonic input from one channel into both channels The Mono mode is active when the button is lighted green i F...

Page 16: ... to the next higher preset number The 1 or 11 buttons may be used to jump from one group of preset numbers to another This avoids having to press the Next button repeatedly to access a distant preset number Example The tuner is set to preset 4 To get to preset 13 press 1 1 then press Next twice To store a station into a memory location first set the tuner to the desired broadcast station Then pres...

Page 17: ...placing the switches close to the Tape Input jacks and the Input Selector System The 945 Line Amplifier is a Class A JFET design employing a differential input stage driving a complementary high gain output stage symmetrically driven for balanced slew rate and low harmonic distortion This topology uses only four active devices per channel and extremely short loop feedback yielding high bandwidth a...

Page 18: ...fied technician and only with the exact type and rating of fuse originally supplied If this fuse is replaced and blows again within a short time disconnect all power immediately and return for service If all controls fuses cables etc seem to be functioning properly a process of one at a time component substitution should be employed until the defective unit is identified If only one channel is not...

Page 19: ...rectly connected to the rack rails The ribbon dipole antenna supplied will offer excellent reception in most situations To maximize the reception potential of this antenna a few guidelines should be followed fully extend the arms of the dipole mount the antenna as high as possible mount the antenna away from large metal structures orient the antenna perpendicular to the direction of the radio stat...

Page 20: ...attempting any cleaning operations There are no user serviceable parts or adjustments inside the 945 Preamp Tuner and all servicing should be referred to qualified authorized personnel SERVICE POLICY AND LIMITED WARRANTY If you encounter any difficulty or have any question concerning your 945 Preamp Tuner please call our Customer Service Department weekdays 8 a m to 3 30 p m Mountain Standard Time...

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