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Hafler 0915P User Manual

Manual is about: Hafler user guide stereo preamplifier Series 915

Summary of 0915P

  • Page 1

    H o m e a u d i o c o m p o n e n t s series p r e a m p l i f i e r.

  • Page 2

    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. The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “...

  • Page 3

    11. Non-use periods during periods of extended non-use, the power cord should be unplugged 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 clea...

  • Page 4

    Table of contents performance specifications ............................................................................................ 4 general information ............................................................................................................... 5 installation rackmounting ...

  • Page 5: Performance Specifications

    Performance specifications phono section (measured 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 m...

  • Page 6: Installation

    General j inputs: tuner, video, cd, phono/aux 1, aux 2, tape monitor 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 convenien...

  • Page 7

    Convenience units wired for 200-240 vac are supplied without convenience outlets to conform to regulatory outlets safety requirements. Line level inputs phono section the ground terminal near the mc/mm switch is provided for turntable frame grounding via the extra (when installed) ground wire provid...

  • Page 8

    Input selector balance control treble control volume control bass control headphone jack power switch up to turn on switched outlets* i 0 -l i w a 0 cj 0 . Rackmount holes (19” version only) tape monitor switch tone in switch output off switch ready light up to monitor tape input up to activate bass...

  • Page 9

    Ac line voltage rating unswitched outlet* out 2 tape video cd phono chassis out 1 rec out aux 2 tuner phono/aux 1 ground line cord connector switched outlets outputs inputs top row - right channel bottom row - left channel mc/mm switch (phono option only) in-moving coil out - moving magnet 915 pream...

  • Page 10

    Tape input/ the 915 incorporates one monitoring loop for use with tape decks, or other input/output signal record output processors. Tone controls/ tone switch volume control balance control the ret out jack feeds a signal to a tape recorder’s input. The signal present at this output is the same as ...

  • Page 11: Circuit Description

    Out 1, out 2 and output off switch headphone activating this switch (up position) turns off both out 1 and out 2. It does not affect the headphone output. This control is useful for turning off the signal to the power amplifier(s) during headphone listening, or for general system muting purposes. Wh...

  • Page 12

    Jfet buffer and the output of the selector system is followed by a very high input-impedance jfet buffer pair record output to establish negligible cmos switch loading (for low distortion) and to provide a low-impedance driver source for the record output and the volume and balance controls. Tape mo...

  • Page 13: Additional Information

    Headphone amplifier internal signal grounding has been carefully routed to follow the signal path from the input jacks, through the selector system, through the volume and balance controls, and finally to the line amplifier. All power supply ground paths are returned to a single “star” ground point ...

  • Page 14

    Plastic button phono pc board main pc board 4 pin connectors plastic standoffs installation of optional phono printed circuit board.

  • Page 15

    Installing cartridge loads changing une voltage ratlng optional cartridge loading is a “fine tuning” matter. Many cartridges are not sensitive to loading and work well without it. Only a cartridge’s manufacturer can provide recommended loading, as every cartridge is different. And only the user can ...

  • Page 16

    Moving magnet loads (capacitors) moving coil loads (resistors) phono board max. Detail of component insertion into phono load sockets (insert leads into outer two holes) installation of optional cartridge loads.

  • Page 17

    General troubleshooting hints place the preamplifier on a soft, protective surface. Remove the eight allen head screws (four on each side), and six phillips head screws (three each on top and bottom), securing the top and bottom covers. Remove covers. 2) referring to the diagram “main printed circui...

  • Page 18

    Ground loops cleaning/ maintenance ground loops are characterized by a low level hum or buzz in the system. Loops are caused by a voltage potential difference between two points in a ground circuit, and aggravated when multiple paths for a given circuit exist. Noise-free audio performance is depende...

  • Page 19

    915 preamplifier functional block diagram one channel shown, phono option installed.

  • Page 20

    Parts list main circuit board d e s i g n a t o r s l - 9 9 : f o r c o m m o n a n d r i g h t c h a n n e l p a r t s 1 0 0 - 1 9 9 : f o r l e f t c h a n n e l designator value part number all resistors 1/4 watt, 1% metal film r1, r101 r2, r102 r3 r4 r5 r6, r106 r7, r107 r8, r106 r9, r109 r10, r...

  • Page 22

    C 2 0 0 - 2 4 0 d 7 1 1 1 4 - 1 5 v l c h ch.

  • Page 23

    Mute board circuit schematic rlb 274k r17 u n l e s s specified otherwise 1. Right channel only shown 2. Component designators 1-99 f o r common and right channel parts. 100-199 fur left channel 5. Ml resistors in ohms, capacitors in m i c r o f a r a d s 5. Tape monitor switch shown in we position.

  • Page 24: Parts List

    Parts list phono board designators 1- 99: for right channel parts 100-l 99: for left channel designator value part number all resistors 1/4 watt, 1% metal film r1, r101 681 r2, r102 33.2 l o w noise r3, r103 33.2 l o w noise r4, r104 681 r5, r105 26.7k r6, r106 3 3 2 k r7, r107 47.5k r8, r108 3 1 6 ...

  • Page 25

    R 2 r 2 r 1 0 3 r 1 0 3 r 1 0 2 r 1 0 2 11 44 0 1 0 4 0 1 0 4 r l 1 8 r l 1 8 r l 1 3 r l 1 3 r 6 r 6 r 1 0 8 r 1 0 8 r l 1 4 r l 1 4 11 44 4 4 phono board component layout diagram.

  • Page 26

    P h o n o i n p u t r 1 5 1 .Ok j 2 l ch i i a 2 phono r 1 8 , p h o n o o u t p u t r 2 0 316 1. Right channel only shown. 2. Component designators 1-99 for right channel parts. 1 w-199 for left channel. 3. All resistors in ohms, capacitors in microfarads. 4. Mc/mm switch shown in moving magnet pos...

  • Page 27

    Service policy and limited warranty if you encounter any difficulty or have any question concerning your 915 preamplifier, please call our customer service department weekdays, 8 am to 3:30 pm, mountain standard time, at 602- 967-3565. Should you have any doubts as to whether the preamplifier is mal...