Servicing &Technology NOVEMBER S 7 /7U -6t Analyzing S
.Servicing &TechnologyAnalyzingSS.Ivania Superset Two,NOVEMBER 1985/ 2.257 /7Uiart 61));;;Z7-6t
4/14'4'CNA"vtAccess SCfl1,ndAdlidcirsExact Repcemt1Semiconductors! There's more ofavailable thru your Zenithdistributor than ever before. Moresemiconductors, more linear ICs,more digital ICs.Actually, your Zenith distributorcan provide you with more Zenithexact replacement semiconductorsthan ever before.and moreZenith Universal Semiconductorscovering the most popular typesin the entire consumer electronicsindustry.More cross references, more lineitems, more support data, too. Allbacked by a name renowned forproduct performance and reliability!And they're all available to you,easy to order in a unique, onenumbering system format.Check with your Zenith distributor's Parts & Accessories SalesManager. He's there, at yourZenith distributor's, waiting to tellyou about his new deal on ZenithUniversal Semiconductors!Call now. Don't keep your ZenithParts & Accessories Sales Managerandthem,-waiting!ENirmThe quality goes in before the name goeson:For your own reputationand in your customers' bestinteres4 always specify ZenithExact Replacement Parts andAccessories.
Fast fix facts011'11service faster and your busi-ess will run smoother with SamsPHOTOFACT? QUICKFACTSTMand COMPUTERFACTSTM service data.Sams service data is always accurateand up-to-date. While most manufacturers make their schematicsfrom a prototype, Sams drawsits information from the end -Sams service data features Samsexclusive GridTraceTM and CircuiTrace photo -diagrams. It's also standardized.That means product components arealways represented in the same locationon the schematic. So it doesn't mattera SAMSQUICKFACTSproduct. The result: what you seein the schematic is exactly whatyou see in the product.which brand you're servicing. One lookat Sams service data and you'll know howto fix it.Get the facts. Get Sams service data.You'll save time, service more. And that'smoney in the bank. To order, contact yourlocal Sams representative. Or call ourtoll-free number and ask for Operator 146.800 -428 -SAMSIn Indiana, call 317-298-5566Howard W. Sams & Co., Inc.4300 West 62nd StreetIndianapolis, IN 46268Circle (21) on Reply CardNovember 1985Electronic Servicing&Technology1
The how-to magazine of electronics.GIGOTRONiGsNo. 11November 1985Build thistelephone testerAnalyzing theSylvania Superset Two,part sixBy Joseph T. Szumowski,CETIn one afternoon, buildBy Carl Babcoke, CETIn his final estimation ofequipment to check Touch Tone outputs and provideringing voltage to test theringer. New technologiesreduce costs.this multicapability TVreceiver, the authordescribes its stereo audiosystem in detail.Unfortunately, no stereobroadcast was availablefrom local TV stations forevaluation of stereobroadcast reception.44TV signals around theworld: today, tomorrowBy Carl Bentz, TV Technical18What do you know aboutelectronics? Know yourenemy-NoiseBy Sam Wilson"Keep it cool " could be theadmonition to anyoneconcerned about unwelcomenoise introduced into asystem whenever, forexample, resistors areconnected across an inputto the amplifier. Read hownoise temperature is amodifying factor.22Editor"User -unfriendly" mightdescribe the world's threemajor TV transmissionsystems that, today, areboth technically andpolitically incompatible.Here's "how to" from amicrocomputer expert whoadvises that most of theconsumer electronicproducts that techniciansrepair are more complexthan computers.transfer their logical approach tocomputer repair. (Photo courtesy ofApple Computer, Inc.)Test your electronicknowledgeBy Sam WilsonReview time! When did youlast think of a bootstrapcircuit, and which devicesfalsely prevent falsetriggering of an SCR in aninductive circuit? Answersare on page 60.Departments:342852545758596061Electronic Servicing & TechnologyThe circuitry of this personal computeris less complex than that of mosttelevisions. TV technicians easily561By Bud lzen, CET/CSM25,386Introductionto microcomputertroubleshooting, partVolumeTechnologyEditorialNewsTroubleshooting ' ExchangeNovember 1985Because Osae Kamada, Hitachi chiefengineer, theorized that the number ofcrystal boundaries in copper cablecorrelated to imperfect sound al cable has been introduced.
TechnologyNew audio -video cablepromises superiorreproduction qualitySo many exciting things havebeen happening in consumerelectronics: microcomputers inall kinds of products, stereoaudio for television, compactdigital audio discs to name afew. But there are some areasof electronics that seem soordinary, so pedestrian, thatyou don't expect to seeannouncements ofadvancements orbreakthroughs.What, for example, could bemore ordinary than the copperwire that connects a stereoamplifier to the speakers, or forthat matter, the shielded cablethat connects the turntable ortape deck to the pre -amp.mean, there's not much chanceof seeing any advances in that,is there? Wrong.ILC-OFCvideo cables.A new cable using linearcrystal/oxygen-free copper (LCOFC), a recent breakthrough inaudio -video technology, recentlyhas been introduced by HitachiCable, Inc. Linear -crystal cableprovides dramatically lower distortion and reduced signal loss com-pared to conventional cable, claimsthe manufacturer. One Japanesecritic is said to proclaim that usingthe new cable makes a differenceequivalent to upgrading a full levelin loudspeaker quality.Developed by Hitachi engineersin Japan, LC-OFC cable makes useof recent research on the crystalsfound in the copper used to makeelectrical cable. Scientists suspected that a major source of distortion and signal loss lay in theboundaries between crystals,which act as a gap the electricalimpulses have to cross. One way tominimize the problem, they reasoned, was simply to reduce thenumber of crystals.To do this, they developed atechnique that produces oversizecopper crystals called, logicallyenough, giant crystals. Then theydevised an extrusion process thatstretches the giant crystals untilthey're thousands of times longerthan usual.What results are linear-crystals(LC). Whereas ordinary coppercable might have 50,000 crystalboundaries per meter, LC cable hasonly 20. Fewer boundaries for a signal to cross, according to the manu-facturer, means less distortion.LC-OFC cable also makes use ofa purer grade of copper, known asoxygen free copper (OFC). Ordinary copper contains an impurity called copper oxide. This formsbarriers between the coppercrystals, making distortion andsignal loss even worse. Oxygenfree copper contains only one hundredth the amount of oxygenthat ordinary copper has.Another improvement incorporated into LC-OFC cable iselasto memory conductor. Electrical energy sets off tiny vibrations when it passes through acable. These vibrations can drainoff signal energy and cause distortion. To prevent this, each linearcrystal cable is tightly wrapped inpolyolefin memory tape, dampening any vibration.LC-OFC cable is said to be particularly effective when used toconnect all the components in astereo or video system, not just thespeakers. Using LC-OFC just toconnect the amplifier with a tapedeck makes a noticeable difference, proponents say.November 1985Electronic Servicing & Technology3
EditorialOne small step, one giant leapThe history of electricity and electronics includesa lot of experimentation with new materials: improving existing materials and finding new materials to do the job. For example, in the early days,much of the insulation was Bakelite, glass, varnished fabric, paper. As the technology advanced,thermoplastics began to take on many of the insulation tasks. Experimentation with germanium andsilicon led to the revolution that replaced vacuumtubes in electronic circuits with far more reliablesolid-state components. Work with phenolic resinsresulted in printed circuit boards, changing the waywiring is handled in many instances. Even the formulation of recording tapes has changed and nowconsumers have a wide choice of tape types tochoose from for various types of recording. Light emitting diodes and liquid crystals have changed theway information about the status of an electronicsproduct is displayed.Recently two developments were announced thatare destined, each in its own way, to change theworld of electronics. One of these developments is inan area that seems so pedestrian that you wouldn'texpect to see significant innovation at this point,and the other is so advanced it's almost unbelievable.Well, who would have thought they'd improve oncables for stereo? I mean, wire's wire, right? Apparently not, as revealed in an article in theTechnology department in this month's ES&T.Metallurgists have recently studied the structure ofthe copper used in ordinary copper wire and foundELGOTRONIOServeing 8 Technologythat its characteristics could be improved. Theyfound a way to remove all of the oxygen, existing inthe wire in the form of copper oxide, that interferes with the transmission of the audio signal.They also have managed to increase the size greatlyof the individual copper crystals in the wire. Thisreduces the number of crystals in the wire accordingly, reducing the number of crystal -to -crystaltransitions that the signal must make. The net resultof all this, claims the manufacturer, is an improvement in audio' system performance equivalent to onelevel of upgrade of components.In contrast to this already commercially availabletechnological advance, another advance in materialstechnology still in the earliest stages is molecularelectronics. According to a newsletter published by"Boardroom Reports," this marriage of electronicsand biotechnology will use tiny organic molecules ascomponents in extremely fast, minuscule electroniccircuits. The newsletter implies that the futurefruits of this new technology could include supercomputers the size of a paperback novel, truly intelligent robot systems and electronic vision for theblind. According to the newsletter "even skepticscan envision commercial produets on the market intwo to five years."Thus is progress made in the field of electronics: aminor innovation here, an incredible breakthroughthere.cY.1.ARTKevin Callahan, Art DirectorJoni Harding, Graphic DesignerADMINISTRATIONEditorial, advertising and circulation correspondence should be addressed to: P.O. Box12901, Overland Park, KS 66212-9981 (a suburbof Kansas City, MO); (913) 888-4864.R. J. Hancock, PresidentJohn C. Arnst, Circulation DirectorEvelyn Rogers, Circulation ManagerDee Manies, Reader CorrespondentEDITORIALNils Conrad Persson, EditorCarl Babcoke, Consumer Servicing ConsultantRhonda L. Wickham, Group Managing EditorMarjorie Riggin, Associate EditorJoy Culver, Editorial AssistantDaryll Fortune, Editorial AssistantBUSINESSCameron Bishop, Group Vice PresidentEric Jacobson, PublisherGreg Garrison, Sales ManagerStephanie Fagan, Promotions ManagerKelly Hawthorne, Marketing AssistantDee Unger, Advertising SupervisorJulie Roberts, Advertising Coordinator4Electronic Servicing & TechnologyMember, Audit Bureauof CirculationMPMember, AmericanBusiness Pressem afmELECTRONIC SERVICINGá TECHNOLOGY is the "how-to"magazine of electronics. It is edited for electronic professionals and enthusiasts who are interested in buying,building, installing and repairing consumer electronicequipment. This includes audio and video equipment,microcomputers and electronic games.SUBSCRIPTION PRICES: one year 18, two years 30,three years 38 in the USA and its possessions. Foreigncountries: one year 22, two years 34, three years 44.Single copy price 2.25; back copies 3.00. Adjustmentnecessitated by subscription termination to single copyrate. Allow 6 to 8 weeks delivery for change of address.Allow 6 to 8 weeks for new subscriptions.PHOTOCOPY RIGHTS: Permission to photocopy for internalor personal use is granted by Intertec Publishing Corp. forlibraries and others registered with Copyright ClearanceCenter (CCC), provided the base fee of 2 per copy of article is paid directly to CCC, 21 Congress St., Salem, MA01970. Special requests should be addressed to EricJacobson, publisher.ISSN 0278-9922 2.00 0.00ELECTRONIC SERVICING & TECHNOLOGY (USPS 462-050)(with which is combined Electronic Technician/Dealer) ispublished monthly by Intertec Publishing Corp., 9221Box 12901, Overland Park, KSOuivira Road, P.O.66212-9981. Second Class Postage paid at Shawnee Mission, KS 66201. Send Form 3579 to P.O. Box 12952,Overland Perk, KS 66212-9981.November 1985INTERTEC1985 All rights reserved.
Ultra wide viewing angle,rear projection TV screenAn ultrawide viewing angle, lowshift screen has beendeveloped. Other significant features are high resolution capabilityand good contrast in ambient light.tests confirmed the computer program's predictions of ultrawideangle light distribution andcolorThe screen is composed of a lenticular array with contiguous blackstripes, a bulk diffuser and aFresnel lens.Most rear projection TV (PTV)systems use a 2 -piece screen inwhich the front piece incorporatesa linear lenticular array that distributes light horizontally, and anarray of black stripes that increasethe image contrast by reducing theambient room light reflections.The lenticular array is on the inside surface on the front piece andthe black stripes are on the outsidesurface. The registration betweenthe black stripes and the lenticulararray must be controlled with highaccuracy so that the TV picture isunaffected by the presence of thestripes. The rear piece of thescreen is composed of a Fresnellens that directs the light towardthe viewing audience and a diffuser that is incorporated intothe screen for vertical spreading.Thé amount of horizontal and vertical spreading defines the dimensions of the audience space.Although the optical performance of these PTV screens isadequate, with the Fresnel lens ithas been improved in terms of thesize of the audience space, colorshift and resolution.00Ominimal color shift.Black stripesAUDIENCESPACENovel approaches to applyingthe black stripes have beenFigure 1. PTV with conventional blackstripe screen.developed and used to manufacture prototype screens. Demonstrations show that the stripes improve contrast without affectinglight distribution. The stripes aredurable and can be cleaned.DiffuserFigure 2. PTV with ultrawide viewingangle screen.There are two types of diffusers;diffusers formed on a surface anddiffusers incorporated within thebulk material. Bulk diffusers areused in the new screen becausethey yield higher resolution. Amethod of analyzing bulk diffuserswas developed so that they couldbe designed for high efficiency andresolution.Fresnel lensThe performance of Fresnellenses of different configurationswas studied with the use of a computer model. A configuration waschosen that yields high efficiencyand good off-axis performance.The facets of the Fresnel lens weredesigned to eliminate artifactsthat result from the Fresnel lensbeing illuminated by three CRTs(two of which are off-axis).Lenticular arrayA computer program was written to predict the optical performance of different lenticular profiles. The program predicts lightFigure 3. Schematic of ultrawide viewingangle screen.distribution and color shift. An optimal lenticular profile was designed that is based on reflective/refractive optics. Due to totalinternal reflection, the side portions of each lenticular elementreflects light away from contiguous black stripes and towardthe tip of the element. Because ofthe shape of the tip, the light isrefracted into the viewing area atvery high angles. Large plasticmodels of individual elementswere constructed. The lenticularshape that produced the bestresults was manufactured with apitch of 0.3mm. ExperimentalOverall screen considerationsBecause two of the surfaces ofthe screen are planar, the screencould be redesigned as a 1- piecescreen. This would significantlyreduce the corner illuminations.The most important attributes ofthis new rear projection TV screenare the perception of uniformbrightness and minimal color shiftthroughout the 180 horizontalviewing angle.This article was based on a paperpresented by engineers of NorthAmerican Philips Corporation.November 1985asElectronic Servicing & Technology5
Analyzingthe Sylvania Superset TwoBy Carl Babcoke, CETSolid-state switching of input stereo signals, electronic volume,balance, bass and treble controls using dc voltages, and details of the stereo poweramplifiers with muting are some of the subjects discussedin this last article of the series.We waited until the last minuteto cover the stereo -audio system inSylvania Superset Two (lower left)model RXS198WA with 19C403AA chassis, in the hope thattelevision stereo audio could beshoppers are reluctant tospend a larger amount for a television with a stereo decoder whennone of the stations are broadcasting stereo in their area. Ofcourse, owners of stereo VCRsnow can begin to use the newTVexternal stereo audio or the internally produced TV stereo audio asinput signals for the internalamplifiers and their speakers. Onthe audio-video/input-outputboard, the switching voltages atJ23-1 and J23-2 are the same asstereo -ready receiver/monitors the video -switching control volt(that have incoming video and ages described in part five, Ocaudio jacks) to watch many taped tober 1985 ES&T. These high andmovies with stereo sound, without low switching voltages come fromwaiting for reluctant local stations the A -V on/off switch under thefront -panel door. When one voltto modernize.This final article of the series ex- age is high (about 12V) the otheramines the Sylvania Superset Two is zero and vice versa.Four RCA -type female phonostereo audio system in detail.sockets for the audio in and outsignals are located on the jackIn/out audio switchingA switching -type integrated cir- panel (top, left). When convencuit (IC1 in Figure 1) selects either tional TV audio is selected by theA/V switch, the left-channel TVaudio enters the audio-video/inputoutput (AVIO) board at cable plugPD2-3, while the right-channel TVaudio enters at PD2-5.The out position of the A -Vpush-button places a 12V high atJ23-2 that closes IC1 internalswitches A and D, allowing TVsound to reach Q22 and Q24, theaudio emitter followers. Outputsignals from the Q22 and Q24emitters are sent through J201-3and J201-6 to the power amplifier(Figure 2).Simultaneously, the zero -voltagelow at J23-1 opens IC1 internalswitches B and C, thus preventingany sound (or hum and noise)entering the left and right audioinput jacks J4 and J6 from reachSylvania Superset -Two model RXS198WA (with a 19C4-03AA chassis) is a coloring Q22 and jackTV/monitor withWhen the AV -I/O switch underrecorders, audiocassette recorders, video games and other accessories. Audio fromthese external sources can be reproduced in stereo when connected to the receiver the panel door is pushed in to theby shielded cables. A decoder is included to provide stereo sound for TV programsA/V position, the J23-2 low opensthat are broadcast In stereo. The two speakers are not attached to the cabinet, butIC1 internal switches A and D,arepushed,buttonsWhenproperthey can be placed wherever the customer desires.preventing the receiver's audiothe time and the TV channel in use are displayed in the picture.heard and evaluated. Unfortunately, no stereo TV audio has beenbroadcast as yet in this area. Thechangeover to stereo at the stations is extensive and expensive,involving not only replacement ofaudio switching and mixing facilities but also complete replacement of the aural (sound) transmitter in some cases. Understandably, the stations are reluctant topay such a high price until thenumber of stereo TV receivers hasincreased. On the other hand,6Electronic Servicing&TechnologyNovember 1985
signals from reaching Q22, Q24and the power amplifier.At the same time, the J23-2
at Sams service data and you'll know how to fix it. Get the facts. Get Sams service data. You'll save time, service more. And that's money in the bank. To order, contact your local Sams representative. Or call our toll -free number and ask for Operator 146. 800 -428 -SAMS In Indiana, call 317-298-5566 Howard W.
North Carolina Housing Finance Agency Servicing Guide as of October 2017 Page 2 Servicing Guide Table of Contents Note: The North Carolina Housing Finance Agency's Servicing Guide ("NCHFA's Servicing Guide") is the controlling document. If a topic is not addressed in NCHFA's Servicing Guide, the Servicer should follow the guidelines set forth in the Fannie Mae
Fannie Mae Reverse Mortgage Loan Servicing Manual iii Preface This Reverse Mortgage Loan Servicing Manual (Manual) incorporates all Fannie Mae servicing-related guidelines for reverse mortgage loans. While the Manual sets forth specific servicing requirements unique to reverse mortgage loans, servicers must continue to comply with servicing .
begin with a discussion of the dynamics around the costs of owning and servicing mortgage servicing rights (MSRs _), which costs are comprised of two components: the cost of capital and the cost of servicing. The cost of servicing, in turn, is comprised of the cost of servicing performing loans and the cost of servicing non-performing loans.
Specialized Loan Servicing LLC is the current mortgagee ofthe note and deed oftrust and SPECIALIZED LOAN SERVICING LLC is mortgage servicer. A servicing agreement between the mortgagee, whose address is Specialized Loan Servicing LLC do SPECIALIZED LOAN SERVICING LLC, 6200 S. Quebec St., Greenwood Village, CO 80111 and the mortgage
Once loan funds are fully disb. ursed, the loan is transferred to the Servicing and Asset Management Office (Servicing Office) for servicing, as described in Section 1 of this Chapter. . USDA, Servicing and Asset Management Office FC-244 ATTN: SCRA . P.O. Box 66818 . St. Louis, MO 63166-6818 FAX: (314) 457-4545 . 2-3
26 Extended essay results November 2010 39 27 Theory of knowledge results November 2010 40 28 Distribution of additional points November 2006–November 2010 41 29 Mean points score worldwide November 2006–November 2010 42 30 Mean grade worldwide November 2006–November 2010 42 31 Pass rate worldwide November 2006–November 2010 43
Class- VI-CBSE-Mathematics Knowing Our Numbers Practice more on Knowing Our Numbers Page - 4 www.embibe.com Total tickets sold ̅ ̅ ̅̅̅7̅̅,707̅̅̅̅̅ ̅ Therefore, 7,707 tickets were sold on all the four days. 2. Shekhar is a famous cricket player. He has so far scored 6980 runs in test matches.
Independent Personal Pronouns Personal Pronouns in Hebrew Person, Gender, Number Singular Person, Gender, Number Plural 3ms (he, it) א ִוה 3mp (they) Sֵה ,הַָּ֫ ֵה 3fs (she, it) א O ה 3fp (they) Uֵה , הַָּ֫ ֵה 2ms (you) הָּ תַא2mp (you all) Sֶּ תַא 2fs (you) ְ תַא 2fp (you
