Harman Kardon CONTERPOINT II FM 100 User's Manual
Contents
1. ESO PEER 0 PRBS b d pea SPRE kii i hoe IMPORTANT It is essential you read this instruction book cate fully before setting up your Harman Kardon system You have invested in a fine instrument into which many excellent engineering developments have been incor porated Hach is important for the proper operation of your system This book has heen written in simple non technical language and if you will take the time to read it first before doing anything else you will find it simple to obtain optimum perfarmance from your Counter point II We especially call your attention to the paragraphs describing the operation of the Variable Automatic Fre quency Control and Variable Automatic Noise Gate Control UNPACKING After unpacking the Counterpoint IT inspect it care fully for any signs of damage in transit Your unit was subjected to many inspections and tests and then carc fully packed If damage is visible notify the transporta tion company at once Check the contents of the package carefully Be sure to inspect the folds of the packing material before COPYRIGHT 1956 in U S A and CANADA by HARMAN KARDON Inc 2A Beate Epa ges woe Ya Mean trvue f i Daf Fe ay A i Pex a OPERATION AND SERVICE INSTRUCTIONS discarding it Your package should contain 1 Counterpoint Il Model FM 100 tuner 1 Instruction Booklet2. 1 Antenna Wire FM 1 Warranty Card 1 Package Hardware 1 Template and Cabinet Installation Instructions It is strongly urged that the warranty card be com pleted and mailed without delay to protect your tights under the warranty If you should require repair ser vice ot information on the use of the Counterpoint II we will be able to identify your unit immediately and respond quickly NOTE To expedite service when necessary please contact Harman Kardon first We will suggest a warranty station in your area and give you the procedure and authorization for shipping INSTALLATION Your Counterpoint IT FM tuner may be installed on an open shelf table bookcase or high fidelity equip ment cabinet For cabinet mounting refer to the tem plate supplied with this instruction book ALL RIGHTS RESERVED b tae By VENTILATION All electrical equipment generates heat which must he allowed to escape Although the Counterpoint II is well ventilated in itself sufficient space should be al lowed around it to permit free air flow If it is placed in a bookcase it should be located well toward the front to provide as much clearance as possible at the rear DO NOT place books or other objects on top of the Counterpoint II Covering the perforated metal cage will prevent proper air flow and will result in sharply reduced component and tube life POWER REQUIREMENTS Plug the AC power cord into any outlet furn
3. OLS Output Level Control The output level of the Counterpoint II may be ad justed to suit the input requirements of the amplifier or to balance the volume of another program soutce such as a record player The Output Level Control located to the right of the AC connection should be set at maximum if it is not desired to balance volume levels FM Rumble Filter Many broadcast stations transmit a certain amount of low frequency rumble that may be produced by the records or turntables used at the station This low fre quency signal is often disturbing in a high quality system and the Counterpoint JI incorporates a rumble filter which eliminates this unwanted signal by reducing re sponse below 50 cycles This filter is controlled by a slide switch on the rear of the chassis Meter Adjustment Control A meter balancing control is incorporated in the Counterpoint II so that the meter may be precisely set This control is located on the back panel slightly to the left and above the Output Jack To adjust tune between stations and turn the control until the needle points to the center of the scale Zero Mark MAINTENANCE AND REPAIR In some installations hum may be encountered due to a voltage dtiference between the amplifier tuner and record changer chassis This may be eliminated by reversing one or all of the AC power plugs Simply reverse one at a time until improvement is experienced Due to the conservative design and high q
4. ake far problems in tuning The Harman Kardon Countet point II incorporates an effective Automatic Frequency Contro AFC circuit that overcomes these problems and insures proper tuning even if the manual tuning is not accurately done The following experiment will lead to an understanding of AFC and the fuller en joyment of the Counterpoint II First rotate the AFC control to the extreme clackwise position Now tune across the scale Note how the stations pop into place one after the other Now tune to any station preferably one with a musical program Turn the AFC control counterclockwise as far as possible This defeats the AFC Tune slowly through the station from left to right Notice that there are three points where the station sounds clean interspersed with points of dis torted sound The middle clean sounding point is the proper tuning position for the best tone quality with minimum noise and interference At this point the tun ing meter will indicate proper tuning Tune slightly away from the proper tuning position until the sound is distorted Note that the tuning meter will indicate improper tuning Now reactivate the AFC by turning the AFC knob to the right You will notice that the sound cleats up and the proper tuning indication is restored as if the receiver had been manually retuned Actually the tuning has been electrically re adjusted by the operation of the AFC circuit which auto matic
5. ally retunes the electronic circuits to the center of the station channel In order to take maximum advantage of the bene fits of AFC it is suggested that tuning be done with AFC off to render a more precise indication of the tun ing meter When AFC is then turned on the tuning will be improved by a ratio of 10 to 1 This procedure is especially recommended in those areas where a weak station is found close to a strong station Under this condition the AFC may tend to reach for the strong station and completely skip over the weak one If the weak station is tuned in without AFC it will be locked in when the AFC is turned on Another procedure might be to find that setting of the AFC control which provides the exact amount of AFC action for most convenient tuning in your location To do this tune to a portton of the dial where a strong station is found immediately adjacent to a weak station If this situation cannot be found in your loca tion leave the AFC control at maximum Now tune slowly through both stations from the direction of the strong station If the AFC control is set too high the stronger station may be held until the tuning is past the weak station Adjust the AFC so that when the stronger station pops out the weaker station appears The professional feature of variable AFC enables the user to select the amount of AFC desired at any time according to location and personal preference BEHIND THE CHASSIS CONTR
6. e chassis If this is done a vise with protected jaws should be used to hold the board while servicing and care should be taken not to exert excessive pressure against the board Avoid Excessive Deposits of Solder In some areas on the printed circuit board the wirt ing is very closely spaced When resoldering a new component avoid excessive deposits of solder Exces sive solder may cause a short or an intermittent trouble to occur later which may be difficult ta locate Avoid Overheating When using the soldering iron 35 watts ot less do not overheat che component terminals or the copper foil Excessive heat applying soldering iron longer than necessary using a higher wattage soldering iron 4 than recommended or using a solder gun may cause the bond between the board and foil to break This will necessitate replacement or repair of the foil connection Tools and Materials Required 1 Low wattage soldering iron with a small point or wedge rating should not exceed 35 watts 2 Small wire brush 3 60 tin 40 lead low temperature rosin core solder 4 Thin bladed knife 5 Small wire pick or soldering aid REPLACING COMPONENTS Soldering Replacement Component to Old Leads Cut the leads where they enter the defective compo nent Clean off the ends of the leads leaving as much of the leads as possible Make a small loop in each lead of the replacement component and slide the loops over the remainin
7. eception The ANG control may be set for minimum inter station noise as required in your location Advancing the control clockwise gradually increases this action and at the extreme clockwise position the ANG has maxi mum effect The continuously variable feature of this control enables you to select the degree of ANG action without cancelling out wanted stations Proper adjustment of the ANG control is made by first turning the control completely counterclockwise and then advancing clockwise to the point where inter station background noise cuts out At this point even the weakest station will operate the noise gate Turning the control further clockwise will require an increasingly stronger signal to operate the noise gate Tuning Meter The precise Harman Kardon tuning meter op erates whether AFC is in the circuit or not When the Counterpoint II is tuned completely off any station the tuning meter will point to zero As you tune through a station the needle will swing to one side then to zero then to the other side and as you tune away from the station back to zero The tuning is proper only when the needle points to approximately zero For precise meter adjustment see Behind The Chassis Controls sec tion for adjustment procedure Automatic Frequency Contro AFC FM Broadcasting by its very nature eliminates al most all natural and man made static However the characteristics of FM which make this possible also m
8. fficult to completely break the connection by brushing Do not overheat the connection os c While applying the soldering iron tu the con nections wiggle the component until it is removed d Remove any small particles of solder using a clean cloth dipped in solvent e A thin film of solder may remain over the hole through the board after removing the component Pierce the film with the lead from the new component after heating the solder film with the soldering iron f Insert the leads of the new component through the holes provided Cut to desired length and bend over the ends against the copper foil Resolder the con nection with 60 40 low temperature solder
9. g leads of the old component Caution should be taken not to overheat the connection since the copper foil may peel or the original component lead may fall out of the board This is possible due to heat trans fer through the leads The lead fength of the replace ment part should be kept reasonably short to provide some mechanical rigidity Unsoldering and Resoldering Components To test a component or if the component is mounted in such a manner that the above method can not be used such as vertically mounted capacitors ctc the compo nent can be replaced by unsoldering it his procedure should be used whenever it is necessary to unsolder any connections to replace defective components a Heat the connection on the wiring side of the board with a small soldering iron When the solder melts brush away the solder Do not overheat the coti nection In the process of removing the solder caution must be taken to prevent excessive heating Therefore do not leave the iron on the connection while brushing away the solder Melt the solder remove the iron and quickly brush away the solder It may require more than one heating and brushing process to completely remove the solder b Insert a knife blade between the wiring foil and the bent over component lead and bend the lead perpendicular to the board It may be necessary to apply the soldering iron to the connection while performing this step as it is somatime di
10. ishing 117 valts 50 or 60 cycles house current The exact voltage is relatively unimportant and may vary between 105 to 125 volts Be sure however that yon have a 50 or 60 cycle AC power source ELECTRICAL CONNECTIONS FM Antenna Due to the extremely high FM sensitivity of the Counterpoint II the 48 piece of wire furnished with the set will be sufficient antenna for all but the most difficult locations One end of this wite should be fastened to the A terminal of the Antenna Terminal Strip the other end left free and extended as may be convenient It may be tacked or stapled to the rear of the bookcase or equipment cabinet if necessary If for some reason it is necessary to utilize other FM antenna types we have listed for your convenience the following suggestions 1 Special outdoor FM antennas may he used These come in various types For extremely difficult locations an in line Yagi cut for the FM band or equivalent may be necessary For reception of FM stattons scattered in many directions a nondirectional antenna may be used This nondirectional type is known as a double dipole and consists of two folded dipoles placed at tight angles to each other 2 Your present TY antenna may be used to obtain a maximum FM signal A special antenna coupler or knife switch should be used when joining the FM line to the television antenna If using a 300 ohm TV wire it should be connected to the G and A terminal
11. on the Antenna Terminal Strip Output Two receptacles will be found at the rear of the chassis marked Output and Multiplex For your convenience in connecting the tuner to the amplifier you will find a 36 shielded cable packed with the Counterpoint II Plug one end of this cable into the Output receptacle and the other end into the ap propriate input receptacle of the amplifier Since the output circuit of the tuner uses a cathode follower this cable may be extended to any reasonable length without deterioration of tone quality The Multiplex jack is taken directly from the detector output and is to be connected to multiplex equipment only The Multiplex output jack bypasses 2 the deemphasis network and will give a 13 8 db rise at 10 000 cycles OPERATION The Harman Kardon Counterpoint JI has only three operating controls The Tuning Knob to the right selects the desired FM station The Concentric Control at the left is two controls in one The inner knob turns the power on and off and adjusts the Automatic Noise Gate action The outer knob controls the Automatic Frequency Control AFC action Maximum AFC and ANG action is obtained in the extreme clockwise po sition TECHNICAL EXPLANATION OF THE CONTROLS Automatic Noise Gate Control Automatic Noise Gate action ANG permits tun ing between stations without the customary FM inter station hiss and adds considerably to the enjoyment of FM r
12. uality components of the Counterpoint II no routine main tenance other than yearly tube testing is required Should trouble develop however only the most qualified ser viceman should be employed as special equipment and training is required to properly service high fidelity equipment This instruction booklet contains diagrams and other information needed by your repairman It should be Kept available for his use CHANGING PILOT LIGHTS AND TUBES In order to change tubes or pilot lights in this unit remove the 7 screws holding the cage and slide cage off Tubes are then exposed and can be removed Make cettain that excessive pressure is not applied to the printed circuit board or components i To change the right hand pilot light turn the tun ing condenser until it is completely closed The pointer will then be at the extreme left of the dial The screw holding the light assembiy at the right side can now be loosened and the assembly pushed straight back thus making the pilot lamp accessible To remove the left pilot light remove the screw holding the assembly and push the assembly straight back while turning to the right To reinsert the pilot light assemblies merely reverse the above procedure STACKING THE COUNTERPOINT II Rubber pads are included in the event that it is desired to stack the tunet on top of the Hatman Kardon Rondo amplifier with a minimum of space between Their correct use 1s as follows 1 Remo
13. ve cage Remove bottom plate Remove both runners from the bottom plate Now replace bottom plate and cage Remove safety paper from each pad and press firmly into place on bottom plate in 4 corners approximately evenly spaced woo i by WARRANTY We warrant each Counterpoint Il Model FM 100 to be free from defects in material and workmanship under normal use and service and in accordance with the conditions herein below set forth for a period of l year from date of delivery to the original purchaser and agree to replace or repair any part or parts except tubes which are under manufacturer s 90 day warranty returned to us within said 1 year with transportation 3 prepaid and which our examination shall disclose to our satisfaction to have been thus defective This war santy does not include free labor nor is it applicable to any instrument which shall have been repaired or altered in any way so as in our judgement to affect its stability or reliability nor which has been subject to neglect misuse abuse negligence or accident nor which has had the serial number altered effaced or removed Neither shall this warranty apply to any instrument which has been connected otherwise than in accordance with the insiruction furnished by us This warranty is expressly in lieu of all other wat ranties express or implied and of all other obligations or liabilities on our part and we neither assume nor authori
14. ze any representative or other person to assume for us any other liability in connection with the sale of the Model FM 100 Counterpoint II SERVICE NOTES Servicing printed circuits is a simple matter and is no more complicated than servicing conventionally wired circuits Printed circuit receivers can be more easily re paired if certain precautions are observed Standard components are used throughout and can be removed and replaced by any serviceman No special tools or skills are necessary However some parts which have special mounting and connection lugs should be replaced _ with exact duplicate parts Avoid Damage to Copper Foil Be careful when removing components from the board However if the copper foil wiring is damaged a piece of wire can be used to replace the damaged foil Small breaks can be jumped with molten solder Larger breaks can be repaired with ordinary hook up wire It ts unnecessary to replace the entire board be cause of foil breakage Avoid Damage to Printed Circuit Board Do not apply excessive pressure to the printed cit cuit board or components This is especially important to note when changing tubes Although the board is sturdy in construction and mounting it may crack or break if proper care is not taken when servicing In case the board is to be removed from the chassis re move the mounting screws around the edges and un solder the few leads that connect between the board and th
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