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Hafler 0915P - page 1
Haflee HOME AUDIO COMPONENTS Series 0915 P R E A M P L I F I E R Series 915 Preamp ...
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Hafler 0915P - 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. A A I 0 The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product? ...
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Hafler 0915P - 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 cleaning fluids or beverages, are not spilled into the ...
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Hafler 0915P - page 4
TABLE OF CONTENTS PERFORMANCE SPECIFICATIONS ............................................................................................ 4 General Information ............................................................................................................... 5 INSTALLATION Rackmounting .................................................. ...
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Hafler 0915P - page 5
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 Magnet: .002% Moving Coil: .009% SENSITIVITY (For 0 ...
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Hafler 0915P - page 6
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 CONVENIENCE OUTLETS: 1 Unswitched, 4 Switched (Polarized) ( ...
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Hafler 0915P - 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 provided on most turntables. For units wired for 100- 12 ...
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Hafler 0915P - 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 & TREBLE UP TO TURN OFF RED FOR MUTE ACTIVA ...
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Hafler 0915P - 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 PREAMPLIFIER REAR PANEL VIEW *100-l 20 VAC UNITS ONLY. ...
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Hafler 0915P - 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 indicated by the Selector Switch. This output ma ...
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Hafler 0915P - page 11
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. When activated, the output switch disconnects the li ...
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Hafler 0915P - page 12
JFET BUFFER AND The output of the Selector System is followed by a very high input-impedance JFET buffer pai r 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 MONITOR SWITCHING VOLUME AND BALANCE CONTROLS LINE ...
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Hafler 0915P - page 13
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 at the power supply to minimize ground modulat ...
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Hafler 0915P - page 14
PLASTIC BUTTON -T PHONO PC BOARD MAIN PC BOARD 4 PIN CONNECTORS PLASTIC STANDOFFS INSTALLATION OF OPTIONAL PHONO PRINTED CIRCUIT BOARD ...
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Hafler 0915P - 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 say for sure whether or not it produces mean ...
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Hafler 0915P - page 16
MOVING MAGNET LOADS (CAPACITORS) MOVING COIL LOADS 1 (RESISTORS) PHONO BOARD - 3181' 3181' MAX. DETAIL OF COMPONENT INSERTION INTO PHONO LOAD SOCKETS (INSERT LEADS INTO OUTER TWO HOLES) INSTALLATION OF OPTIONAL CARTRIDGE LOADS ...
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Hafler 0915P - 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 Circuit Board Component Layout”, locate the three wi ...
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Hafler 0915P - 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 dependent upon all grounds being at the same potential, w ...
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Hafler 0915P - page 19
I t I 915 PREAMPLIFIER FUNCTIONAL BLOCK DIAGRAM ONE CHANNEL SHOWN, PHONO OPTION INSTALLED ...
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Hafler 0915P - page 20
PARTS LIST - MAIN CIRCUIT BOARD DESIGNATORS l-99: FOR COMMON AND RIGHT CHANNEL PARTS 100-199: FOR LEFT CHANNEL 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, R110 R11, R111 R12 R13, R113 R14 R15, R115 R16, R116 R17, R117 R16, R116 R19 R20 R21 R22 R23 R24 R25 R26 ...
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Hafler 0915P - page 21
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Hafler 0915P - page 22
A&B=100-12OVW: c - 200-240 VAE: rJoba’- ----- i -1 -L +--- ’ A----- D7 1 N5226B Bci D6 i lN4145 RlQ 1OK 1 +15V- .di PWNOOPllONJUMPERS PHONOPWER 1 K 4 +15V -15V L CH hL CH Rl +15V ...
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Hafler 0915P - page 23
MUTE RUAY BOARD CIRCUIT SCHEMATIC Rlb 274K R17 JlO ENANCE UNLESS SPECIFIED OTHERWISE 1. RIGHT CHANNEL ONLY SHOWN 2. COMPONENT DESIGNATORS 1-99 FOR COMMON AND RIGHT CHANNEL PARTS. 100-199 FUR LEFT CHANNEL 5. ML RESISTORS IN OHMS, CAPACITORS IN MICROFARADS 4.TCNE5WllCHSHWNINBYPASSPO5RlCN 5. TAPE MONITOR SWITCH SHOWN IN WE POSITION 6.MUERW.AY5lUWNINUN ...
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Hafler 0915P - page 24
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 Low Noise R3, R103 33.2 Low Noise R4, R104 681 R5, R105 26.7K R6, R106 332K R7, R107 47.5K R8, R108 316 R9, R109 100 R10, R110 33.2 Low Noise R11, R111 3.32M R12 ...
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Hafler 0915P - page 25
l-l R3n R3n D D RlO RlO 4-k 4-k R2 R2 -c=l- -c=l- -fxb -fxb R103 R103 0 0 3 3 RllO RllO < < R102 R102 > > I I I 1 1 4 4 a a En En "R1B05 "R1B05 c5 c5 R;' R;' %13 %13 0104 0104 Rl18 Rl18 "OS "OS ii:: ii:: Rl13 Rl13 jRSo jRSo f;oRll f;oRll Rl9 Rl9 R6 R6 Rl4 Rl4 Rfli Rl150 Rl150 BfWOd' BfWOd' Rll9 Rl ...
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Hafler 0915P - page 26
PHONO INPUT f R15 316 D,‘) + I.,#. 1Mp = 1 .OK 05 2sJ74 J2 Rl RR1 L CH I I -. a2 IMC/MM SWrrCH RlO PHONO POWER R18 II I, , B 22.1M -%+ PHONO OUTPUT 06 2SK163 Q R20 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 S ...
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Hafler 0915P - 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 malfunctioning and requires service, please call us b ...
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