Summary of the content on the page No. 1
Haflee
HOME AUDIO COMPONENTS
Series 0915
P R E A M P L I F I E R
Summary of the content on the page No. 2
NOTICE - IMPORTANT SAFETY INFORMATION 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’s enclosure, that may A RISK OF ELECTRIC SHOCK be of sufficient magnitude to constitute a risk of 00 NOT OPEN electric shock to persons. The exclamation point within an equilateral WARNING: TO PREVENT FIRE OR triangle is intended to alert the user of the I SHOCK HAZARD, DO NOT EXPOSE THIS
Summary of the content on the page No. 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 enclosure of the equipment. 14. DAMAGE REQUIRING SERVICE Hafler equipment should be serviced by qualified service personnel when: A. The power supply
Summary of the content on the page No. 4
TABLE OF CONTENTS 4 ............................................................................................ PERFORMANCE SPECIFICATIONS 5 General Information ............................................................................................................... INSTALLATION 5 Rackmounting ........................................................................................................................ 5 Ventilation/Placement .....................................................
Summary of the content on the page No. 5
PERFORMANCE SPECIFICATIONS All specifications are for 20 Hz - 20 kHz unless specified otherwise. FREQUENCY RESPONSE: +/-0.1 dB PHONO SECTION (Measured At MAXIMUM OUTPUT: 5 volts RMS REC OUT) TOTAL HARMONIC DISTORTION AND NOISE: Moving Magnet: .002% Moving Coil: .009% SENSITIVITY (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 SIG
Summary of the content on the page No. 6
GENERAL j INPUTS: Tuner, Video, CD, Phono/Aux 1, Aux 2, Tape Monitor INFORMATION 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 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). 43.2c
Summary of the content on the page No. 7
For units wired for 100-120 VAC, the Power Switch controls the Switched Convenience Outlets only. As soon as the 915 is plugged into the AC line, power is applied to the circuitry (regardless of the position of the front panel Power Switch). Therefore, all connections should be performed with the unit unplugged. For all units, when power is applied, the Ready Light will glow red for several seconds, indicating that the Audio and Headphone Outputs are muted. Once the delay period has passed and t
Summary of the content on the page No. 8
INPUT SELECTOR BALANCE CONTROL TREBLE CONTROL POWER SWITCH UP TO TURN ON VOLUME CONTROL BASS CONTROL HEADPHONE JACK SWITCHED OUTLETS* 0 0 I -l I A w CJ 0 . RACKMOUNT HOLES TONE IN SWITCH OUTPUT OFF SWITCH READY LIGHT TAPE MONITOR SWITCH (19” VERSION ONLY) UP TO MONITOR TAPE INPUT UP TO ACTIVATE BASS & TREBLE UP TO TURN OFF RED FOR MUTE ACTIVATED GREEN FOR OPERATE OUT1 &OUT2 915 PREAMPLIFIER FRONT PANEL VIEW *lOO-120 VAC UNITS ONLY. 200-240 VAC UNITS ARE WITHOUT CONVENIENCE OUTLETS: POWER SWITCH
Summary of the content on the page No. 9
AC LINE VOLTAGE RATING TAPE OUT 2 VIDEO CD PHONO CHASSIS UNSWITCHED OUTLET* REC OUT OUT 1 AUX 2 GROUND TUNER PHONO/AUX 1 LINE CORD CONNECTOR SWITCHED OUTLETS INPUTS OUTPUTS MC/MM SWITCH (PHONO OPTION ONLY) TOP ROW - RIGHT CHANNEL IN-MOVING COIL BOTTOM ROW - LEFT CHANNEL OUT - MOVING MAGNET 915 PREAMPLIFIER REAR PANEL VIEW *100-l 20 VAC UNITS ONLY. 200-240 VAC UNITS ARE WITHOUT CONVENIENCE OUTLETS.
Summary of the content on the page No. 10
TAPE INPUT/ The 915 incorporates one monitoring loop for use with tape decks, or other input/output signal processors. RECORD OUTPUT 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 may alternately be used to feed the input of a signal processing device, such as an equalizer. Though rare, it is possible that some external devices connected to Rec Out may cause slight distortion to the main s
Summary of the content on the page No. 11
OUT 1, OUT 2 Activating this switch (UP position) turns off both Out 1 and Out 2. It does not affect the headphone AND OUTPUT OFF output. This control is useful for turning off the signal to the power amplifier(s) during headphone SWITCH listening, or for general system muting purposes. When activated, the output switch disconnects the line amplifier from the output jacks, and grounds the jacks to prevent possible system noise due to open amplifier inputs. Out 1 and Out 2 are connected in parall
Summary of the content on the page No. 12
The output of the Selector System is followed by a very high input-impedance JFET buffer pair JFET BUFFER AND to establish negligible CMOS switch loading (for low distortion) and to provide a low-impedance RECORD OUTPUT source for the Record Output and the Volume and Balance controls. DRIVER The Tape Monitor Switch drives a relay to break the line input path to insert tape input signals. TAPE MONITOR SWITCHING The relay employs gold plated contacts, and allows optimum signal routing by placing t
Summary of the content on the page No. 13
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 modulations. Extensive use of ground planes and interchannel shields maximize inter-channel separation. For units wired for 100-120 VAC, the power supply is kept “on” at all times s
Summary of the content on the page No. 14
PLASTIC BUTTON -T PHONO PC BOARD MAIN PC BOARD 4 PIN CONNECTORS PLASTIC STANDOFFS INSTALLATION OF OPTIONAL PHONO PRINTED CIRCUIT BOARD
Summary of the content on the page No. 15
INSTALLING Optional cartridge loading is a “fine tuning” matter. Many cartridges are not sensitive to loading CARTRIDGE LOADS 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 meaningful sonic improvement. Components suitable for cartridge loads may be obtained from electronic parts or specialty audio component suppliers. Resistors should be 1% tolerance, metal-
Summary of the content on the page No. 16
MOVING MAGNET LOADS (CAPACITORS) \ 3181' 3181' MAX. MOVING COIL LOADS 1 (RESISTORS) DETAIL OF COMPONENT INSERTION INTO PHONO LOAD SOCKETS (INSERT LEADS INTO OUTER TWO HOLES) PHONO BOARD - INSTALLATION OF OPTIONAL CARTRIDGE LOADS
Summary of the content on the page No. 17
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. Referring to the diagram “Main Printed Circuit Board Component Layout”, locate the three wire 2) jumper locations labelled “A”, “B”, and "C", in front of the power transformer. These jumpers control the series/parallel connections of the power transformer’s primary. Remove the
Summary of the content on the page No. 18
Ground loops are characterized by a low level hum or buzz in the system. Loops are caused by GROUND LOOPS 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, with a single path for each ground connection. Ground loops can exist in two forms: 1) loops created in audio interconnects, and 2) loops created between earth grounded chas
Summary of the content on the page No. 19
I t I 915 PREAMPLIFIER FUNCTIONAL BLOCK DIAGRAM ONE CHANNEL SHOWN, PHONO OPTION INSTALLED
Summary of the content on the page No. 20
PARTS LIST - MAIN CIRCUIT BOARD DESIGNATORS l-99: FOR COMMON AND RIGHT CHANNEL PARTS 100-199: FOR LEFT CHANNEL PART NUMBER DESIGNATOR VALUE PART NUMBER DESIGNATOR VALUE ALL RESISTORS 1/4 WATT, 1% METAL FILM U1 U101 4051 SSH-656 R1, R101 2.15K RMP/4-2151 U2 4053 SSH-657 R2, R102 20K RMP/4-2002 U3 NE5532 SSH-667 R3 100K RMP/4-1003 U4 7815 SSH-625 RMP/4-1003 R4 100K U5 7915 SSH-628 RMP/4-1003 R5 100K RMP/4-2002 2SK163, Graded SSH-614T R6, R106 20K Q1,Q101 RMP/4-1001 SSH-614T R7,
