Instruction/ maintenance manual of the product 915 Hafler
Go to page of 27
Haflee HOME AUDIO COMPONENTS Series 0915 P R E A M P L I F I E R Series 915 Preamp.
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.
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.
TABLE OF CONTENTS PERFORMANCE SPECIFICATIONS ............................................................................................ 4 General Information ...........................................................................................
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: .
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.
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.
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 .
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.
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.
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.
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.
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.
PLASTIC BUTTON -T PHONO PC BOARD MAIN PC BOARD 4 PIN CONNECTORS PLASTIC STANDOFFS INSTALLATION OF OPTIONAL PHONO PRINTED CIRCUIT BOARD.
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.
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) INS.
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.
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.
I t I 915 PREAMPLIFIER FUNCTIONAL BLOCK DIAGRAM ONE CHANNEL SHOWN, PHONO OPTION INSTALLED.
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 R.
wvuwla mom lN3NOdW03 awoa mm13 NIVW ‘NOlldO ONOHd LIOA CY,.tl”P r 21”nqy 1 10 u us I !! I - I! ! ! ! I I.
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.
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.
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.
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 01.
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.
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.
An important point after buying a device Hafler 915 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Hafler 915 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Hafler 915 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Hafler 915 you will learn all the available features of the product, as well as information on its operation. The information that you get Hafler 915 will certainly help you make a decision on the purchase.
If you already are a holder of Hafler 915, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Hafler 915.
However, one of the most important roles played by the user manual is to help in solving problems with Hafler 915. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Hafler 915 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
