Hafler 9130 User's Manual
Contents
1. HOME AUDIO COMPONENTS Series 9130 Power Amplifier Series 9130 NOTICE IMPORTANT SAFETY INFORMATION DO NOT OPEN electric shock to persons SHOCK HAZARD DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and mainte nance servicing instructions in the literature accompanying the appliance WARNING TO PREVENT FIRE OR 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 products enclosure that may RISK OF ELECTRIC SHOCK be of sufficient magnitude to constitute a risk of READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment should be read before power is applied to the equipment RETAIN OWNERS MANUAL These safety and operating instructions should be retained for future reference HEED WARNINGS warnings on the equipment and in the operating instructions are important and should be followed FOLLOW INSTRUCTIONS AII operating and use instructions are important and should be followed HEAT The equipment should be kept away from areas of high temperature such as heater vents radiators stoves ovens fireplaces 6 VENTILATION The equipment should be used in an area suitable for proper ventilation Care should be taken not to impede air2. the first step should be to use a ground adaptor with the ground tab or wire of the adaptor not connected on the power cord plug of the preamplifier DO NOT cut off the grounding pin on the plug It may be necessary to use additional adaptors on other grounded components if more than two components are earth grounded In other words only one earth ground per system should exist Another potential source of multiple earth grounds is from coaxial antenna or cable service feeds for FM or video sources which usually are and should be earth grounded The ground adaptor s should cure this grounding problem as well WARNING The use of ground adaptors with the ground tab or wire of the adaptor discon nected will eliminate the safety feature of the grounded power cord This safety feature is intended to reduce the risk of electric shock should an internal fault in the equipment result in an electrically live chassis Therefore this method of ground isolation should be employed only when absolutely necessary rather than as a general practice When using a ground adaptor for isolation make sure that the power cord plug is inserted into the receptacle in the same orientation as if no adaptor were present to maintain the same hot neutral polarity CLEANING MAINTENANCE SPECIAL NOTE ON VIDEO CABLE GROUNDS As mentioned above the ground conductor of cable service and antenna feeds should be connected to earth ground Often however du
3. The Thermal Protection System consists of thermistors temperature sensitive resistors mounted to the heatsinks connected to a comparator system that activates when the heatsinks reach an unsafe operating temperature The output of the comparator system is connected to a small transistor switch that turns off the input stage of the amplifier which effectively shuts down the entire amplifier When the heatsinks cool to a safe temperature the amplifier is turned on again The Soft Turn On Off System cooperates with the Thermal Protection System by sensing the output of the high voltage power supply At power up when both the comparator and power supply have stabilized to normal operating levels the Soft Turn On System activates the amplifier circuitry through the same transistor switch in the input stage At power down the system deactivates the amplifier rapidly before the power supply begins to collapse This system eliminates spurious noises during the turn on off cycle The power supply utilizes a large El type transformer with dual multi tapped primaries to allow alternate connections for world wide voltage operation Selection of the various voltage options is made via a simple multi position plug inside the unit The transformer feeds a conventional split full wave bridge rectifier system Power supply capacitance is 6800 UF per rail Further power supply de coupling is provided for the input stage of each channel ADDITIONAL INFORMATI
4. J2 Left Binding Post CC 0374 R218 47 5 RMP 4 0475 J102 Right Binding Post CC 0373 J201 AC Voltage Selector VR1 VR101 50K Volume RVH 503G Header CCH 245 1 101 1 K Trim RV 102 Hewla 2 2 102 500 Trim RVH 501A J301 IEC Connector CCH 233 ALL CAPACITORS MICROFARADS s Stereo llono Sw 7 0 6301 Power Switch SWH 0392 Gray C1 C101 2 2 Polypropylene CPP 205C SWH 0393 Black C2 C102 220p Polypropylene CPP 221 F1 F101 5 Amp 6 FS 005 C3 C103 330p Polypropylene CPP 331 5 Amp 5x20mm FS 0387 230VAC C4 C104 100 NP Electrolytic 107 F2 F102 5 Amp 3AG FS 005 C5 C105 47p Mica CM 470 5 Amp 5x20mm FS 0387 230VAC C6 C106 206 Polypropylene CPP 221 LINE FUSE 5 Amp Slo 3AG FS 005SB 100 120VAC 670107 8 Mica CM 030 2 5 Amp Slo 5 0383 230VAC 14 5 1 1 23 se nani Ez J101 RIGHT INPUT J1 LEFT INPUT e 1 NOTES 1 ALL RESISTORS IN OHMS 2 ALL CAPACITORS IN MICROFARADS 3 COMPONENT DESIGNATORS 1 98 LEFT CHANNEL E d tue 301 399 CHASSIS POWER SUPPLY 4 LEFT CHANNEL ONLY SHOWN 5 STEREO MONO SWITCH SHOWN IN STEREO POSITION 6 VOLTAGE SELECTOR SHOWN IN 100V POSITION 7 LINE FUSE VALUE 100 126 AC SA SLO BLO 230 6 2 5A SLO BLO 9 130 CIRCUIT SCHEMATIC DIAGRAM REVISED 9 3 92 UNE FUSE SEE NOTES J201 LINE VOLTAGE SELECTOR S301 POWER C20 SWITCH 10 Sii 148 10 42 011 UN 9 R13 R26 LEFT 1 1K 2 5 R27 1 10
5. i G10 01 HV 47 5 5 CIRCUIT SCHEMATIC DIAGRAM TOL CH TOR CH REVISED 9 3 92 SERVICE POLICY AND LIMITED WARRANTY If you encounter any difficulty or have any question concerning your 9130 Amplifier please call our Customer Service Department weekdays 8 a m to 3 30 p m Mountain Standard Time at 602 967 3565 Should you have any doubts as to whether the amplifier is malfunctioning and requires service please call us before sending in for repair All units being returned regardless of warranty status must receive a Return Authorization RA number In addition we can offer troubleshooting assistance that may simplify or even eliminate the need for factory service The Hafler 9130 Amplifier is warranted to the original owner non transferrable for seven years from the date of purchase including parts labor and return shipping costs within the Continental United States Alaska and Hawaii This warranty applies only to products sold in the United States Of America For warranties outside the U S A please contact your local agent It is the owner s responsibility to pay shipping preferably United Parcel Service UPS to the factory collect shipments will not be accepted Units under warranty should be accompanied by a copy of the dated Bill Of Sale Use the original carton and all packing material with the RA number clearly marked on the outside of the package Be sure to include a return address the RA number a
6. output connections for short circuits or abnormally low speaker load impedances If all connections and load conditions appear to be correct 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 functioning properly a one at a time reversal of interconnect and speaker cables from left to right should reveal the malfunctioning component 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 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 chassis Mounting components to a rack with metallic rails may introduce ground loops between associated equipment because the rails can introduce a second ground path The extent of this problem will depend on the grounding arrangements of associated equipment Ground loops can occur in non rackmounted equipment though it is less common If ground loops occur and any other component in the system has a three wire grounded power cord
7. remove the round grounding pin on the plug in an attempt to mate to a two wire ungrounded receptacle use a grounding adaptor with the grounding tab or wire suitably connected to earth ground 12 15 16 NON USE PERIODS During periods of extended non use the power cord should be unplugged from the power source CLEANING The equipment should be cleaned only as detailed in the operating instructions 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 DAMAGE REQUIRING SERVICE Hafler equipment should be serviced by qualified service personnel when A The power supply cord or plug has been damaged or B Objects have fallen or liquid has been spilled into the equipment or 0 The equipment has been exposed to rain or D The equipment does not appear to operate normally or exhibits a marked change in performance or E The equipment has been dropped or the enclosure has been damaged SERVICING The user should not attempt to service the equipment beyond that which is described in the operating instructions AII other service should be referred to qualified service personnel 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 unev
8. H 708 R14 R114 22 1K RMP 4 2212 Q5 Q105 2N5550 SSH 613 R15R115 10 RMP 4 0100 Q6 Q106 2N5401 SSH 708 R16 R116 33 2 RMP 4 0332 Q7 0107 2N5401 SSH 708 R17 R117 47 5 RMP 4 0475 Q8 0108 2N2222A SSH 611 R18 R118 475 RMP 4 4750 Q9 Q109 2N5550 SSH 613 R19 R119 10 RMP 4 0100 Q10 Q110 2N5401 SSH 708 R20 R120 221 RMP 4 2210 Q11 Q111 2N5550 SSH 613 R21 1 221 RMP 4 2210 Q12 0112 25 1056 SSH 710 R22 R122 47 5 RMP 4 0475 013 0113 25 160 SSH 709 R23 R123 10 RMP 4 0100 014011 25550 SSH 613 R24 R124 10 RMP 4 0100 0201 MPSAO6 SS 102A R25 R125 30 5 W Carbon RC 2 300 R26 R126 2 7 1 W Metal RM1 027 LM339 SS 140 R27 R127 10 2 W Metal RM2 100 TSI Thermal Sensor SSH 730 28 128 10 RMP 4 0100 2 Thermal Sensor SSH 730 R201 22 1K RMP 4 2212 R202 1K RMP 4 1001 CRI CRI 01 1N4148 SS 162 R203 5 11K RMP 4 5111 CR2 CR102 1N4148 SS 162 R204 1K RMP 4 1001 CR3 CR103 1N4148 SS 162 R205 5 11K RMP 4 5111 CR4 CR104 1N4148 SS 162 R206 5 11K RMP 4 5111 CR5 CR105 1N4148 55 162 R207 10K RMP 4 1002 CR6 CR106 1N4148 SS 162 R208 10K RMP 4 1002 CR7 CR107 1N4148 SS 162 R209 100K RMP 4 1003 CR8 CR108 1N4148 SS 162 R210 12 1K RMP 4 1212 CR9 CR109 1N4148 55 162 R211 3 3K 5 W Carbon RC 2 332 CR14 CR114 1N4148 SS 162 R212 475K RMP 4 4753 CR15 CR115 1N4148 SS 162 R213 10K RMP 4 1002 CR201 1N5245B 15V SS 212 R214 221K RMP 4 2213 CR202 1N5239B 9 1V SSH 652 R215 1 0M RMP 4 1004 BR301 Diode Bridge SSH 628 R216 1 0M RMPM 1004 J1 J101 RCA Jack HW 735G R217 47 5K RMP 4 4752
9. MPLIFIER OUTPUT MONO STEREO WIT V o CN RIGHT CH RIGHT RIGHT 11 5 AMPLIFIER OUTPUT INPUT POWER THERMAL THERMAL n SUPPLY SENSORS PRELE TN SYSTEM SYSTEM 9130 FUNCTIONAL BLOCK DIAGRAM PARTS LIST Parts values and types subject to change without prior notice DESIGNATORS 1 99 LEFT CHANNEL DESIGNATOR VALUE PART NUMBER 101 1 99 RIGHT CHANNEL C8 C108 0 001 Polypropylene CPP 102 201 299 COMMON PARTS C9 C109 100 Electrolytic CER 107C 301 399 CHASSIS POWER SUPPLY C10 C110 0 1 Polyester CP 104A C11 C111 0 1 Polyester CP 104A DESIGNATOR VALUE PART NUMBER C12 C112 0 033 Polypropylene CPP 333 C13 C113 0 1 Polyester CP 104A m lea WATT PME TTI C14 C114 100 6 CER 107C specified Otherwise C15 0115 0 1 Polyester CP 104A R1 R101 1 1K RMP 4 1101 C16 C116 0 1 Polyester CP 104A R2 R102 22 1K RMP 4 2212 C201 10 6 CER 106B R3 R103 475 RMP 4 0475 C202 0 1 Polyester CYV 104 R4 R104 47 5 RMP 4 0475 C203 220 6 CER 227F R5 R105 10K RMP 4 1002 C204 100 Electrolytic CER 107C R6 R106 681 RMP 4 6810 C301 6800 Electrolytic CER 688D R7 R107 10 RMP 4 0100 C302 6800 Electrolytic CER 688D R8 R108 681 RMP 4 6810 C303 0 01 Ceramic CD I 03 20 R9 R109 221K RMP 4 2211 C304 0 01 UL Approved CD 103A 3K gt Wat 01 0101 25550 SSH 613 R11 R111 22 1 K RMP 4 2212 Q2 Q102 2N5550 SSH 613 R12 R112 1K RMP 4 1001 Q3 Q103 2N5401 SSH 708 R13 R113 11K RMP 4 1101 Q4 0104 2N5401 SS
10. ON LOUDSPEAKER LOAD IMPEDANCE CONSIDERATIONS The 9130 Amplifier is suitable for use with a wide variety of loudspeaker types and load impedances Operation into impedances below 4 ohms is not recommended as little additional power is available below 4 ohms Operation at very high power levels into low impedances for extended periods may overheat the amplifier but no damage will occur due to the Thermal Protection System In the Mono Mode some additional consideration is required when driving low impedances When a stereo amplifier is converted bridged into a single channel mono amplifier each half of the bridged amplifier sees only half of the loudspeaker s load impedance For example when driving an 8 ohm load in the Mono Mode each channel is actually loaded to 4 ohms Therefore it is not recommended to operate the amplifier in Mono Mode into impedances below 8 ohms It is usually better to use a stereo amplifier of higher power rating rather than two bridged amplifiers of lower power when driving low impedances CHANGING LINE VOLTAGE RATING ADJUSTING BIAS The 9130 Amplifier is equipped with a simple means to adjust the AC line voltage rating for 100 120 or 230 volts AC 50 60 Hz The configuration is labelled above the power cord connector If the amplifier will be used in a location that requires a different line voltage use the following procedure to change the configuration Review the modification instructions befo
11. amatically reduce harmonic distortion The final output stage uses two multiple lateral MOSFET s Metal Oxide Semiconductor Field Effect Transistors per channel These devices unlike conventional bipolar transistors have a negative temperature coefficient which means that they do not exhibit thermal runaway Thermal runaway is a phenomenon whereby a transistor heats up as it conducts more current which causes it to get hotter and conduct more current and so on until the device self destructs Since MOSFET s are inherently self protecting no sonically degrading complex circuitry is required to monitor and protect the output devices Furthermore these lateral MOSFET s exhibit a very linear input to output transfer function Their connection in circuits and operating characteristics are very similar to vacuum tubes which is perhaps responsible for their widely recognized sonic trait of being very musical and non fatiguing Conversion to Mono Mode is accomplished by driving the negative input feedback point of the right channel with the output of the left channel This causes the right channel to mirror exactly the output of the left channel but 180 degrees out of phase This creates twice the voltage swing to be available across the two red output binding posts This simple method of bridging the amplifier involving only one resistor eliminates the costly and sonically degrading inverter circuitry used in other amplifiers
12. daytime telephone number and a brief description of the difficulty including whether it occurs continuously or intermittently This warranty gives you specific legal rights You may also have other rights which vary from state to state 19
13. e to long feed lengths especially in apartment distribution systems this ground will be of poor quality and could be a source of noise This interference is usually characterized by a high frequency noise rather than a hum or a buzz If such interference is experienced a separate earth ground connection should be made from the cable outlet nearest the audio video equipment to a known good earth ground If ground loops exist due to potential differences in the interconnects in rack mounted systems then it is advisable to isolate the preamplifier chassis from the rack rails This may be accomplished by sandwiching a thin sheet of insulating material ie plastic washers or several layers of electrical tape etc between the rack and the preamplifier and securing the unit with non metallic i e nylon etc hardware It may be necessary to insulate other components so that only one component is directly connected to the rack rails If the faceplate should become soiled it may be cleaned with a slightly damp soft cloth and if necessary a mild detergent Do not use any abrasive cleaners or solvents Unplug the power cord before attempting any cleaning operations Except as specifically detailed in the owners manual there are no user serviceable parts or adjustments inside the 9130 Amplifier and all servicing should be referred to qualified authorized personnel 12 61 LEFT MONO LEFT MONO GAIN LEFT CH LEFT INPUT A
14. e used 5 POWER SWITCH LEFT MONO UP ON GAIN DOWN OFF RACKMOUNT HOLES RIGHT RACK HANDLES 19 VERSION ONLY GAIN 19 VERSION ONLY 9130 AMPLIFIER FRONT PANEL VIEW TANVd HV38 HaldildNV 6 INdINO INdINO ONOR 1431 1431 1 YOLOANNOD Ri c Q3023NIT 2 09 0 OVA OZL Wee 038315 100 ONILVY INdINO NI 395 17160 OV ONON HOLIMS 97 OUTPUTS GAIN CONTROLS MONO STEREO SWITCHING SOFT TURN ON OFF SYSTEM THERMAL PROTECTION SYSTEM All output connections to the amplifier must be performed with the amplifier off The left and right audio outputs from the amplifier are via standard 5 way type 3 4 spacing binding posts Connect these binding posts to the loudspeakers The amplifier s binding posts will accept single or dual banana plugs spade lugs pin plugs or bare wires If using bare wires it is recommended that the ends of the wire be tinned with solder so that no stray strands can cause a short circuit to the chassis or adjacent terminals To ensure proper speaker phasing and frequency response be sure to connect each respective amplifier RED terminal to the speaker RED terminal and the amplifier BLACK terminal to the speaker BLACK terminal The polarity symbols for Stereo Mode are labelled directly above the amplifiers binding posts For operation in the Mono Mode a single loudspeake
15. en surfaces may cause the equipment and cart combination to topple 2 TABLE OF CONTENTS PERFORMANCE SPECIFICATIONS General Information INSTALLATION Rackmounting OPERATION CONNECTIONS Power Cord Connection Power Switch Front Panel View Diagram Rear Panel View Diagram OUTPUTS Gain Controls ttt Mono Stereo Switching Soft Turn On System Thermal Protection Systemi CIRCUIT HIGHLIGHTS ins ADDITIONAL INFORMATION Loudspeaker Load Impedance Considerations Changing Line Voltage Rating Adjusting Blas General Troubleshooting Hints Ground LOOPS Cleaning Maintenance Functional Block Diagram Parts List 447 nas Component Layout Diagrami Circuit Schematic Diagram SERVICE POLICY AND LIMITED WARRANTY Ventilation Placement Line Voltage QO N PERFORMANCE SPECIFICATIONS GENERAL INFORMATION All specifications are for 20 Hz 20 kHz at full power into 8 ohms unless specified otherwise P
16. flow in and around the cabinet Do not mount on a carpeted shelf or in a sealed enclosure Allow for proper clearance above the equipment 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 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 point POWER CORD PROTECTION Power cords should be arranged so that they do not interfere with the movement of objects in the room people fan blades utility carts etc Also care should be taken that the cord is not pinched or cut and placed so that it is not in danger of being pinched or cut as in under a rug around a tight corner etc POWER CORD GROUNDING The power supply cord is of a three wire grounded type designed to reduce the risk of electric shock sustained from a live cabinet It is assumed to be of suitable length for most uses of the equipment The use of extension cords and power strips is discouraged unless they are of suitable rating to deliver the required total current for safe operation of all connected equipment Furthermore extension cords or power strips must provide the same three wire grounded connection lt is important that the blades of the equipment s plug be able to fully insert into the mating receptacle Never
17. her power single channel amplifier in the Mono Mode Operation of the Stereo Mono switch must be performed with the amplifier off Set the Stereo Mono Switch in the OUT position for Stereo Mode or in the IN position for Mono Mode Mono Mode operation requires different input and output connections consult the sections of the manual titled Inputs and Outputs The 9130 Amplifier is equipped with a Soft Turn On Off System that gradually activates the amplifier s circuitry to avoid spurious noises as the power supply stabilizes At turn off this same system rapidly deactivates the amplifier s circuitry before the power supply begins to collapse again eliminating any spurious noises The 9130 Amplifier is equipped with a Thermal Protection System that constantly monitors the temperature of the heatsinks When the heatsink temperature reaches a pre determined level the amplifier s circuitry is electronically shut down through the same system that provides the Soft Turn On function When the heatsinks cool to a safe operating temperature normal operation of the amplifier resumes CIRCUIT HIGHLIGHTS The 9130 employs a single ended current source driven differential input stage This stage is connected to the rest of the circuitry through a balanced push pull current mirror system A combination current mirror and bias multiplier drive the final output stage driver emitter followers Special linearizing techniques are used that dr
18. meter to a scale capable of measuring at least 130 mA WARNING THE NEXT STEP OF THIS PROCEDURE CAN EXPOSE THE OPERATOR TO UNINSULATED HIGH VOLTAGES KEEP ALL BODY PARTS CLEAR OF THE INTERNAL CIRCUITRY OF THE AMPLIFIER IO GENERAL TROUBLESHOOTING HINTS GROUND LOOPS 4 Apply power to the amplifier and allow the unit to thermally stabilize for about three minutes If using an analog meter and the meter reads backwards temporarily remove power and reverse the meter leads 5 Again referring to the diagram locate the trimmer potentiometer labelled PI for the left channel or PI 01 for the right channel NOTE Do not confuse these trimmers with those labelled P2 and P102 these are for distortion control and require specialized test equipment to adjust Using a small screwdriver adjust the trimmer for a measured current of 130 mA 6 Remove power from the amplifier Wait about one minute for the power supply to discharge and remove the meter connections Replace the fuse Repeat steps 2 3 4 5 and 6 for the other channel 8 Replace the cover The 9130 Amplifier contains five internal fuses one for AC line power and four for DC power supplies These fuses should not generally blow unless a malfunction has occurred These fuses should be replaced only by a qualified technician and only with the exact type s and rating of fuse s originally supplied If a fuse is replaced and blows again within a short time check all
19. ower Rating Rated THD Full Power Bandwidth Signal to Noise Ratio Input Impedance Input Sensitivity Damping Factor Controls Inputs outputs Power Consumption Size Weight 65 watts per channel 8 ohms less than 0 008 4 Hz to 40 kHz greater than 100 dB unweighted 22 000 ohms 1 1 volts RMS 10051 kHz 50 to 10 kHz Power Switch Left Right Gain Controls Mono Stereo Switch Right and Left Mono RCA jacks Right Left and Mono 5 way Binding Posts 40 watts quiescent 600 watts maximum 17 W x 9 x 3 5 H excluding feet faceplate 17 19 W 43 2cm W 22 8cm D x 8 9cm H excluding feet faceplate 43 2cm or 48 3cm W 20 5 9 kg net INSTALLATION RAC KMOUNTING VENTILATION PLACEMENT UNE VOLTAGE The 9130 Amplifier is supplied in either a 17 Black Version or a 19 Silver Version The 19 model has rackmounting holes provided for installation in equipment racks The holes are on standard EIA spacings Due to conflict with adjacent equipment it may be advisable to remove the four rubber feet from the bottom of the unit The feet may be removed from the outside with no dis assembly of the chassis necessary The 9130 Amplifier can produce considerable heat during normal operation The amplifier should be placed on a hard smooth surface to allow air to circulate beneath the unit Additionally allow at least one inch of free space on either side and several inches abo
20. 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 grounding pin from the male end of the cord In applications where a grounded outlet is not available a ground adaptor should be employed with the ground tab or wire of the adaptor connected to a suitable earth ground The AC power cord of the amplifier must be connected to a receptacle capable of delivering a minimum of 600 watts The convenience outlets of some preamplifiers are not rated for this power level Before connecting the amplifier be sure to check the rating of such outlets and take into account the power consumption of any other connected components to determine the total maximum power consumption If the amplifier is connected to a component with a switched convenience outlet then the amplifier s Power Switch may be left ON at all times and the power controlled by the switched outlet If the amplifier is connected to an unswitched outlet then the amplifie s power should be controlled by the front panel Power Switch All input connections to the amplifier must be performed with the amplifier off The left and right audio inputs to the amplifier are via standard RCA jacks Connect these jacks to the output of the preamplifier or other signal source When operating the amplifier in the Mono Mode only the left channel input should b
21. r should be connected to the two RED binding posts only No connection is made to the amplifiers BLACK binding posts Connect the speakers RED terminal to the amplifiers RED terminal labelled and the speaker s BLACK terminal to the amplifiers RED terminal labelled The polarity symbols for the Mono Mode are labelled above the polarity markings for the Stereo Mode The 9130 Amplifier is equipped with front panel mounted Gain Controls These controls may be used to attenuate the input signal to the amplifier The maximum clockwise position of these controls applies the full input signal to the amplifier Intermediate positions of these controls will partially attenuate the signal and the full counter clockwise position attenuates the input signal completely Most applications will dictate that these controls be set to their maximum clockwise position In situations of unusually high level signal sources or for matching levels in multiple amplifier installa tions it may be desirable to use an intermediate position of the Gain Controls Unless intentionally introducing different gain levels in the two channels of the amplifier these controls should normally be set at the same rotational position In the Mono Mode the Left Gain Control affects the overall gain of the amplifier The Right Gain Control has no effect The 9130 Amplifier may be operated in the normal two channel Stereo Mode or may be converted bridged to a hig
22. re attempting this procedure If any doubts exist about one s ability to change the line voltage it is advisable that the procedure be conducted by a qualified technician NOTE Units wired for 230 VAC may be used over a range of 220 to 240 VAC No compromise in safety or performance will result from operation within this range WARNING UNPLUG THE UNIT FROM AC POWER BEFORE ATTEMPTING THIS PROCEDURE FAILURE TO DO SO CAN RESULT IN SEVERE ELECTRICAL SHOCK 1 Remove the top cover by removing the four hex head screws two on each side 2 Using the diagram Component Layout as a guide find the white Voltage Selector plug on the printed circuit board located behind the front panel Power Switch Note that this plug has several alternate positions Each position is labelled for where the end of the plug is to be aligned for each appropriate voltage Move this plug to the new desired position making sure that the plug is fully seated on the mating pins 3 Depending upon which new voltage is chosen it may be necessary to change the AC line fuse Locate the clip mounted Line Fuse adjacent to the Voltage Selector plug Replace the fuse with a new slow blow fuse as follows 100 and 120 VAC 5 amp 230 VAC 2 5 amp NOTE For units wired at 100 120 VAC the AC line fuse should be a 1 4 x 1 1 4 size and approved by UL CSA For units wired at 230 VAC the fuse should be a 5 x 20mm size and approved according to IEC 127 4 Replace the co
23. ve and behind the amplifier to allow air circulation around the heatsinks This is particularly important when the unit is installed in a closed cabinet In applications where the amplifier is driving low impedance and or low efficiency loudspeakers at high levels thermal shutdown may occur if inadequate ventilation is provided If this occurs it may be necessary to move the amplifier to a location with better free air circulation The amplifier should be located at least several inches away from sensitive components such as preamplifiers tuners CD players turntables etc due to the possibility of audible hum or buzz from magnetic radiation The 9130 Amplifier is configurable for either 100 120 or 230 volt operation This is accomplished by moving the Voltage Selector on the printed circuit board The procedure is detailed in the section CHANGING LINE VOLTAGE RATING Make sure that the unit is configured for your local AC line voltage before attempted use The configuration is labelled directly above the power cord connector Units wired for 230VAC may be used over a range of 220 to 240VAC OPERATION CONNECTIONS POWER CORD CONNECTION POWER SWITCH INPUTS Units wired for 100 and 230 VAC are supplied without power cords 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
24. ver 5 Obtain a new voltage configuration label from the factory and affix over the original markings on the rear panel Alternately prepare a small self adhesive label and indicate the new voltage with permanent ink Relabelling the unit is a vital safety requirement particularly if the amplifier is sold to a new owner The 9130 Amplifier employs a single control per channel to set the bias operating point of the output stage This bias point is factory set and normally should not require adjustment for the life of the product However should improper bias be suspected or if repairs have been made that would require a readjustment of bias the following procedure should be used Review the instructions before attempting this procedure lf any doubts exist about one s ability to set the bias it is advisable that the procedure be conducted by a qualified technician WARNING UNPLUG THE UNIT FROM AC POWER BEFORE ATTEMPTING THIS PROCEDURE FAILURE TO DO SO CAN RESULT IN SEVERE ELECTRICAL SHOCK REQUIRED TEST EQUIPMENT Milliammeter capable of measuring at least 130 mA 1 Remove the top cover by removing the four hex head screws two on each side 2 Using the diagram Component Layout as a guide find the fuses labelled FI and F2 for the left channel or Fl 01 and F102 for the right channel 3 Working on one channel at a time remove either one and only one of the fuses Connect the milliammeter to the two fuse clips and set the
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