Heath Company Heathkit H9 Assembly Manual Download Page 83

Page: 83 / 146

Summary of Contents for Heathkit H9

Page 1: ...t r H MANUAL for the VIDEO TERMINAL ModelH9 ASSEMBLY 5e5 1se6 05 HEATHCOMPANY BENTONHARBOR MICHIGAN...

Page 2: ...ucts when correctly assembled calibrated adiusted and used in accordance with our printed instructions will meet published specifications If a defective part or error in design has caused your Heathki...

Page 3: ...Heathkit Manual for the VIDEOTERMINAL ModelH9 ASSEMBLY 5e5 1ee6 05 HEATH COMPANY BENTON HARBOR MICHIGAN Copyrlght 1977 Heath Company Nl Rights Reserved Printed intheUniled States of America 49o 22...

Page 4: ...Video Circuit Board Checkout CRTInstallation KEYBOARDCIRCUITBOARD Partslist 85 Step by Step Assembly 87 KeyboardCircuit BoardCheckout 99 RAM AND COUNTERCIRCUITBOARD Partslist 103 Step by Step Assembly...

Page 5: ...lel I O interface to a paper tape punch The Video Terminal can be used with any digital computer in dedicated stand alone applications or in time sharing systems It lets you communicate with a digital...

Page 6: ...nal injury or tube damage When you openthe box stampedPKS 1 6 you will find a Pack Index Sheetin the top of the box This sheetshowshow thebox hasbeendivided into differ entcompartmentswhich arereferre...

Page 7: ...r of this Manual If a Parts Order Form is not available refer to Replacement Parts inside the rearcover Your Warrantyis inside thefront cover Forprices referto theseparate Heath PartsPrice List Eachci...

Page 8: ...r 4 Partnumber withatypenumber other thantheone listed Paseo KEY HEATH QTY DESCRIPTION No PartNo CONNECTORS _ SHELLS PLUGS CIRCUIT Comp No HARDWARE NOTE Thehardware maybepacked inmorethanonepacket Ope...

Page 9: ...TPU circuitboard F1 74 6 90 t2 t0 1 181 2679 2 I 1 1 KEY HEATH OTY DESCRIPTION No PartNo Miscellaneous cont d CIRCUIT Comp No F2 260 16 203 1894 F3 F4 F5 205 778 F6 258 33 F7 258 79 F8 261 21 F9 352...

Page 10: ...operation for a group of assemblysteps Detailsgenerallyillustratea singlestep When you are directed to refer to a certain Pictorial for the following steps continueusing that Pictorialuntil you arere...

Page 11: ...es 6 SOLDERING Solderingis oneofthemostimportant operationsyou will performwhile assembling your kit A good sol der connectionwill form an electricalconnectionbe tween two parts such as a component le...

Page 12: ...ginsto melt allowit to flow around theconnection Thenremove thesolder andtheironandlettheconnection cool SOLDtRING POOR SOLDER CONNECTIONS SOTDERDOTSNOI FLOW LUGANO WIRT A DARK oNTo rHe ROSIN BEADSURR...

Page 13: ...o not use the black or hex head hardware unless it is specifically called for in a step i Mount a 6 solder lug at AT with a 6 32 x 3lB screw and a 6 32 nut Position the solder lug as shown STANDOFF IN...

Page 14: ...earestthe left edge of the chassis CIRCUIT BOARD HOLDER 4 In the samemanner presscircuit boardholders to the chassisat Q at R and at S 4 Install circuit board standoffsat AE and AF from the underside...

Page 15: ...hell This indicatesholes 1 and 6 Detail 1 2D NOTE If it is ever necessaryto remove a spring con nector from the socket shell use a small screwdriver and depressthe tab on the spring connector through...

Page 16: ...rdware a lz Nur Setthe chassisasidetemporarily Referto Pictorial 1 3 Illustration Booklet page4 for the following steps I Locatetherearpaneland position it asshown 1 4f SWz Referto Detail 1 3A and ins...

Page 17: ...ATIONFROMTHEENDOF TACHLFAD FINT WIRE STRANDS 3 TWI ST THEFI NEWI RE STRANDS AT THETND OF EACHLEADAND MFLTA VERYSMAL AMOUNT OF SOTDER TOTHF STRA NDS TO HOLD THEM TOGETHER Detail 1 3D 4 Referto Detail 1...

Page 18: ...thelug Seeinsetdrawing 2 onPictorialt 4 2 In the following steps NS meansnot to solder the connection becauseother wires will be addedlater S with a number such as S 3 meansto solder the connections...

Page 19: ...nsmechanically secure J Connecta 7 314 blackstranded wire to termi nal strip AR betweenlugs 4 S 2 and 5 S 3 Make mechanically secureconnections Removethe red cap from the fuseholder and insert the 1 a...

Page 20: ...eboth sidepanelsand position them on a soft cloth l Refer to the inset drawing and insert a self retaining nut into hole CB slotted end first Pressor tapthe nut into the sidepaneluntil it is flush wit...

Page 21: ...5 for the following steps f it P7bsitionthe chassis topside up as shown i Mount the rear panel to the upper rear side panels with 6 32 x 3 8 hex head screws at locations CP and CG J Mount the CRT brac...

Page 22: ...Cand installa 12 pinplug at C from the top of the chassis Inthesamemanner install12 pinplugsatthefollow ing location i Install a 12 pin plug and a 6 pin plug fend to end at A l Install a 12 pinplug an...

Page 23: ...elsothat number l is evenwith pin 1 of plug A and pressthe number strip onto the chassis 4 Removenumber strip B from the label sheet Then cut numbers1 7and18from the labeland discard them Remove the p...

Page 24: ...Page 22 TOPOF CHASSIS z6 ff lIl llll ff _lo C C 5C c o o or O...

Page 25: ...mper wires betweenplug D and plug H as follows fumper wire betweenpins 1 fumper wire betweenpins 2 fumper wires betweenpins 4 fumper wire betweenpins 5 fumper wire betweenpins 6 fumper wire betweenpin...

Page 26: ...l2 2 l WE v v 4 J il N q K 0 P t Wrap maskingtapearound the harnessat the indicatedlocationsand mark the properbreak outnumberson the tape Seethe insetdrawing on Pictorial2 2 This will help you locate...

Page 27: ...n pins 10 or 12 Bluewire to pin 6 S 1 0 4 Greenwire to pin 5 S 3 NOTE There are components alreadyconnectedto this pin Connectthe wires coming from BO 9 asfollows ri Orangewire to plug D pin S S 1 V W...

Page 28: ...ofcapacitor C2 s 1 Referto Pictorial2 5 IllustrationBooklet Page9 for the following steps NOTE The pressure requiredto pusha socketontoa chassis plug may causethe plug to pushthroughthe chassis Theref...

Page 29: ...bel having numbers10through 16 onto connec tor socketB V5 Mark connectorsocket5402as shown V tr6 If you wish labelbreakout r of theharness Referto Pictorial2 6 IllustrationBooklet Page10 for the follo...

Page 30: ...th sidesof the transistorinsulator Savethe re maining siliconegrease it will beusedlater 3 Position the transistor insulator onto the metalsideof thetransistorsothatthe hole in the insulator and the h...

Page 31: ...tor in the next step insert the lead throughthe lug andthenmakea 714 loop in the lead Solderthe leadto the lug but do not get solderin the loop seethe inset drawing on Pictorial 2 7 Be sure this lead...

Page 32: ...steps NOTE In thefollowing steps bevery carefulthat you do not damagethe paperconeof the speaker Locatethe speakerand position it asshown o o o c o o CH SSIS WIRING CONTINUED y C1 Installthe 12 000 p...

Page 33: ...emove the protective paper backing from one side of the foam tape and press the tape to the back of the speaker Then trim off the cor ners to match the back of the speaker Remove the protective paper...

Page 34: ...lotted side of the socket shell Brown wire in hole 1 White wire in hole 2 t Blue wire in hole 3 Yellow wire in hole 4 I Greenwire in hole 5 A Mark this connectorsocket 5501 and mark a number 1 at the...

Page 35: ...he following PartsList The key numbers correspond to thenumberson thePowerSupplyCir cuit BoardPartsPictorial IllustrationBooklet Page 13 Any part that is packagedin an individual en velopewith apartnu...

Page 36: ...r pF GREEN GOLD 100 000 5o o 30 x 100 000 3 000 000 O or3MO 3MO 3MEGOHMS Capacitors will be called out by their capacitance value in pF microfarads or pF picofarads andtype ceramic Mylar electrolytic...

Page 37: ...Part number t n tu KEY No D1 417 819 1 D2 417 899 1 D3 442 609 1 D4 442 644 1 D5 442 il 2 D6 442 618 1 HARDWARE E1 250 381 2 E2 250 26 2 E3 250 1173 2 E4 252 3 4 E5 2U 1 6 E6 255 74 2 E7 255 77 2 MJE1...

Page 38: ...use too much solderand then drag the soldering iron acrossthe board when you removeit from the connection Always use just enoughsolder to make a good connection and lift the soldering iron straight up...

Page 39: ...ered connection if you use too much solder or if you drag the soldering iron acrossother foils asyou remove it from the connection A good rule to follow is always take a good look at the foil areaarou...

Page 40: ...r location on the circuit board Resistorscan be positionedeither way Press the resistor against the circuit board Then bend the leads outward slightly to hold the resistor in place PICTORIAT 3 1 Solde...

Page 41: ...glass body do not mistake the colored end inside the diode for the banded end Look for a band painted on the outside of the glass NOTE Makesureyou haveinstalled the first resistor in Pictorial 3 1 y l...

Page 42: ...he positive mark on the board POSITIVE I 1ARK sb lA q i P0slTlvt 1 IC104 7qL tz IC 442 644 Line up the flat on the IC with the flat on the circuit board out line Insert the leads of the IC into their...

Page 43: ...1 4 above the MEIAL y Turn the circuit board over and positionit foil sideup asshown NOTE In the next step keep the diode leads as short as possible and make sure the leads do not touch anv other foi...

Page 44: ...e L 8 of bare wire behind the spring connector A Position a 3 connector socket shell as shown in Part A of Pictorial 3 5 Then insert the connec tor end of the orange and black wires into the indicated...

Page 45: ...re to install the positive leadinto the positive hole in the circuit board Solderthe leadsto the foil and cut off the excesslead lengths f Bfue wire to hole OUT y Brownwire to hole ground a ned wire t...

Page 46: ...per and pressthe fish paperin place on the heatsink nextto IC101 Pushthe indicated edgeunder the IC pins and againstthe IC as shown Deta 3 7A t l In the samemanner install the other piece of fish pape...

Page 47: ...the transistor properly and push Vplace the transistor insulator on the MI 2955 transistor 477 899 Note the wide spacebe tween the insulator holes and the wide space betweenthetransistorpins and oneof...

Page 48: ...nual Correcta problem beforeyou proceedto the next step PRIMARY WIRING TESTS Referto Pictorial 3 9 for the following steps rJ Setyour ohmmeterrangeswitch to xt0 3ffi J Connect the negative ohmmeter le...

Page 49: ...ps t Position the chassisbottom sideup Page47 Detail 3 1oA RFMOVEPROTECTI VE BACKING PAPERFROM UNDTRTHIS AREAONLY Referto Detail 3 10A for the next two steps 7 2 t Locate the saved 4 1 12 x 5 piece of...

Page 50: ...s column showsthe meter reading you should obtain If you do not getthe cor rectreading this means that D101 in this case could be incorrectly in stalled or faulty or a component associated with D101 c...

Page 51: ...the unshaded boxes indicate plug P101 Allow the meter time to stop moving before you read it NEGATIVE LEADTO POSITIVE LEADTO SELECTOR RANGE METER INDICATION POSSIBLEAREA OF TROUBLE ru ru OHMS Rx 1000...

Page 52: ...tboardsonumber 1 onthesocket large red wire matchespin 1 on the board 6 1 1 il 6 32x 318 BLACK SCREW P102 BLK Push connectorsocket 5102 from the main harness onto plug P102on the power supply circuit...

Page 53: ...pin indicated seeDetail 3 1 28 NOTES 1 2 NOTE Your voltage indications in the following stepswill depend upon the accuracy of your meter They should be close to the indication in the Meter Reading co...

Page 54: ...orsare 5 fourthbandgold 1 4 Watt A1 6 271 12 1 270O red violet brown R203 Al 6 122 12 1 1200O brown red red R205 41 6 222 12 3 2200O red red red R207 R212 R213 Al 6 472 12 6 4700O yellow violet red R2...

Page 55: ...lC 7490 lC 741593 lC 74LS95tC 741S175rC 74193tC 74LS266 lC 2 1 1 1 2 l 2 CAUTION Theprotected RO32513 443 812 lC canbe damaged bystaticelectricity DONOTremove itfromthefoam paduntilyouareinstructed t...

Page 56: ...hrough holes connect to gether the foils on the two sides of the circuit board at the proper locations E E o E _ Ll E OEO V Position the circuit board as shown with the lettered side uo IV R208 47OO Q...

Page 57: ...rc2o2 r y tczoa l rcztz 0 0 G m 14 pin IC sockets at the eighteen fol lowing locations rjr l r t 1c207 TCzO4 IC2O6 1c207 IC2O8 IC2O9 1C21 5 IC216 ICz t7 IC2 t8 IC219 1c220 1C221 TCz22 24 pinIC socketa...

Page 58: ...he foil and cut off the excess lead leneths FLAT AA r LlLJtt t 1 NOTE When you install ceramic capacitors removeany excesscoat ing from the leads Use long nose pliers to removethis coating A d ffi I C...

Page 59: ...one side of a 314 x 314 piece of the leftover foam tape and press it onto the crystal Remove the remaining paper backing and press the crystal onto the circuit board Form a hook in one end of two 1 b...

Page 60: ...cuit board Then check to be sure all of the pins are started into the socket holes before you seat the IC pins into the socket Be careful that a pin does not bend under the IC as it will appear to be...

Page 61: ...O EE G J 1 L4 IC O3 74L5175IC 443 752 o YlCzoz 74L5775IC 443 7s2 1C206 74LS266 IC 443 71 9 t IC2o8 74L574IC 443 730 lC2O9 74L5266 IC 443 71 9 y l 1C212 74LSo4 IC 443 75s 4 tczts 741 sJ tc 443 612 u lc...

Page 62: ...e circuit board Then push the IC pins into the IC socket Once in the socket the IC is protected IC205 R032513protected IC 443 8721 CIRCUIT BOARD CHECKOUT Visual Inspection Carefully inspect foil side...

Page 63: ...ition the chassisup on its right power transformer side Install the charactergeneratorcircuit board onto plugs P201and P202 Pushthe circuit boardtoward the chassisuntil it is ful ly seatedon the plugs...

Page 64: ...orange R311 R342 22 kO red red orange R304 R325 100 kO brown black R315 R337 yellow 180kO brown gray yellow R313 R314 1 MO brown black green R307 R308 R309 R339 3 3MO orange orange R341 green 1000O 1...

Page 65: ...uits aremarked foriden tification in oneofthefollowing fourways 1 Partnumber 2 Typenumber Onan integrated circuit thisrefers onlyto the numbers andletterslisted Anyaddi tionalletters or numbers onthel...

Page 66: ...k fl brown gray yellow t nsos 1 MO fbrown black u green R312 1000 O brown black Solderthe leadsto the foil and cut off the excesslead lengths l Rsro 1so O brown green l R323 3 9 f orange white Solder...

Page 67: ...gray red 1 r 1 hare wire I vJ R341 3 3 MO orange orange Rsaa 1000O brown black redl Y R339 1 MO brown black When a bare wire is called for in a step cut the specified length of wire from the bare wire...

Page 68: ...2N3go4 transistor 477 8751 V Qsoz 2N4i 41 transistor 417 235 fu Q301 MPSAO5 transistor 477 864 f C303 2 2 pF tantalum When you install atantalumcapacitor always match its positive mark or color dot w...

Page 69: ...ead lensths iJ Prepare the ends of a L 714 white wire Solder one end into the indicated hole Push the free end of the wire into the indi cated circuit board pin Turn the circuit board over and positio...

Page 70: ...11 caoo 1pFMylar G fr l t l I ll__l f _J t C307 1 pF Mylar Solder the leads to the foil and cut off the excesslead lengths t C325 01 pF ceramic Ii C323 01 pF ceramic J caos 1pF Mylar C327 05 pF cerami...

Page 71: ...lll ll c rLl ilG Ra trt I h l l o l I l A l I lm t 1 R303 5000 O 5k control 10 904 r C328 1OO pF electrolytic Match the positive leadon the capacitorwith the plus mark on the board NOTE Matchthebando...

Page 72: ...ing three transistors position their metal side as shown Insert their leads into the proper holes in the board Position the bottom of only the next two transistors 7 1d above 0 Qsos MJE1s1 transistor...

Page 73: ...installed tvl R346 loooo atG1 R340 1000 O at the indicated end of the 1000 O resistor out l I Rsaz loooo atG2 0 Install a heat sink on transistor Q306 Be sure the heat sink is against the metal side o...

Page 74: ...e socket 5103 with a number 1 at the brown lead CIRCUIT BOARD CHECKOUT Visual Inspection Carefullyinspectthe foil side of the circuit boardfor the following most commonly made errors Unsolderedconnect...

Page 75: ...F TROUBLE P302 3 P302 6 OHMS RX1OOO GREATER THANIOOO O Q308 Q309 P302 4 P301 4 OHMS RX 1OOO GREATER THANlOOO O Q306 C309 P302 4 P302 6 OHMS RX 1OOO GREATER THAN 20 KO Q301 Q302 PSO24 P302 5 OHMS RX 1O...

Page 76: ...Pase74 YOKECLA 1 P ANODT SOCKTT ffi LTADSPOSITIONED IOWARDTOP CLOTH PICTORIAL 5 1 1 o 3 o l 5 A 7 A...

Page 77: ...ke over the neck of the CRT with the leads coming from the yoke as shown Push the yoke firmly against the flared part of the CRT Do not tighten the yoke clamp screw Position the leadstowards the top o...

Page 78: ...RNAL TNTERNAL P 8 SOLDER LOCKWASHER 8 32 NUT T00lH L0cKWASHER iq Jit P 33il il 8 TXTERNAL INTI TOOTH LOCKWAS RNAL HER r5 flo BRACKTT z PICTORIAI 5 12 8 EXTERNAL I NTTRNAT IOOIH LOCKWASHIR 8 32 NUT 6 3...

Page 79: ...on nut to the other CRT brace Use this bracein the next step Mount the braceto the rear panel at EGwith a 6 32 x 3 8 black screw Do not tighten this screw uiii lo scREW t v Locatethe following hardwar...

Page 80: ...Paqe78 ry K3 SOCKET INSULATED HANDL Fl r t YELLOW CLI P LIAD oo Detail 5 13A...

Page 81: ...e screwdriver with a plastic handle Then slip the screwdriver under the boot to make contact with the anode socket CAUTION Do not touch anything with your other hand while you perform this step 2 Fold...

Page 82: ...Paseso 4 ot ro L l l l l Detail 5 138 A r...

Page 83: ...ion yokeontoplug P301on the videocircuitboard so the number 1 on the socketfgreenlead matchesthe number 1 on the board PushsocketS1o3coming from the CRT socket onto plug P103 on the power supply circu...

Page 84: ...c S DANGER HIGH VOLTAGE ON VIDEO CIRCUIT BOARD I r yrrrrQ HEIGHT RING MAGNET e e e e z oo PICTORIAL 5 I4...

Page 85: ...onnecta secondclip leadbetweenpins 1 and 4 Thescreenshoulddisplayrowsof sixeswith underlines Removethe secondclip lead from pin 1 and connectit to pin 3 The screenshould display rows of threeswith und...

Page 86: ...ENTS Referto Pictorial S tb for the following steps Make the following voltage measurements on the video circuit board o o o NEGATIVE LEADTO POSIT VE LEADTO SELECTOR _ RANGE METERINDICATION POSSIBLE A...

Page 87: ...418 R419 R421 R431 R406 R403 R401 R422 R424 R426 R428 A2 6 471 CAPACITORS 81 21 46 B1 21 199 82 27 73 DIODES ct 56 26 c1 56 56 KEY HEATH QTY DESCRIPTION No PartNo Resistors cont d 1 2 WATT CIRCUIT Com...

Page 88: ...crew 6 Small4 40 nut 6 Large4 40 nut 12 4 lockwasher 6 118 longspacer Set of space bar partsconsisting of 2 Screw 2 Plasticquide 2 Metal slider 1 Torsionbar 1 U clip 66 Key knob 1 Spacebar knob 2 Keyb...

Page 89: ...O red red orange R4O7 22OOO red red red t I Dsot 1N191 diode fbrown white brown 56 26 Match the band on the diode with the band on the circuit board out Iine 1 112 barewire t i R oo 1o kO brown black...

Page 90: ...re 1 1l4 bare wire 1 1 bare wire r 1 bare wire l 1 112 bare wire R 08 47OOA fyellow violet 0 1 bare wire Q i 1 1 14 bare wire 1 bare wire 1 bare wire 1 112 barewire 7 7l4 bare wire Solderthe leadsto t...

Page 91: ...to the foil and cut off the excess lead leneths 1 114 bare wire 1 1 118 bare wire I R 15 47OO A yellow violet t Ra16 47OO A yellow violet y R4O9 47OO A yellow violet i 1 3 4 bare wire 1t 1 t 7l2 bare...

Page 92: ...location may be marked 47oo i R424t 150 kO brown green yellow l 1 bare wire j Ra05 100 O brown black brown R42B 150 kO brown green yellow f rj R zlt 47o A fyellow violet hrown NOTFI This locntion may...

Page 93: ...n you install an IC soc ket make sure each socket pin is in its board hole and that the index mark color dotJ on the circuit board outline is still visible after the socket is installed Then solder th...

Page 94: ...OARD Detail 6 6A Soldor the loads to the foil and cut off the excess lead lengths IDENTIFICATION DRAWING 1a pin IC socketat IC4o1 l 20 pin IC socketat IC403 1 i1 ao pin IC socketat IC402 O plnedgeplug...

Page 95: ...of the circuit board Ell E IDENTIFICATION 1S pinedgeplug at P403 15 pinedgeplug atP Oz I n rlF l Ca06 047 pF Mylar r C408 O47 p F Mylar C4O7 O47 pF Mylar 1 CaOz 1 pF ceramic i Solder the leads to the...

Page 96: ...Pasee4 BANIDED END BANDEDEND PICTORIAL6 8...

Page 97: ...circuit board screeningwhen you install the Short Form switch The circuit board mav be screenedin error it sHoRrFoRM i nuer nx orr LINE A In the same manner install the 60 momentary pushbutton switche...

Page 98: ...labelin installedit is almost impossibleto getit off without damage to thelabel If you install a key label on the wrong key removethe key from the switch do not removethe label The key can then be pu...

Page 99: ...and slid ers BE SURE the circuit board is supported from the foil side Detail 6 10E Referto Detail 6 10F and fit each end of the torsion bar into the squarehole in eachmetal slider Then push the torsi...

Page 100: ...nsistorfor properinstallation Checkthe plugs for proper installation Check diodes for proper positioningof the bandedend CheckIC sfor propertype and installation Referto Detail6 10Gfor properidentific...

Page 101: ...lowing resistancemeasurements on the keyboard HHMHHHH NEGATIVE LEAD TO POStTtVE LEADTO SELECTOR_ RANGE METERINDICATION POSSIBLEAREA OF TROUBLE P401 1 P401 4 OHMS RXlOOO GREATER THAN 5 KO tc402 P401 1...

Page 102: ...t n too __l _ __ j _ __ _ lS St _ _ _ l 1 1 ___ PICTORIAL 6 12...

Page 103: ...screws Position the keyboard as far front away from the CRT as possible and tighten the four mounting screws Positionthe chassistopsideup VISUAT CHECKS Referto Pictorial 6 13 Illustration Booklet Pag...

Page 104: ...etandmakethe samevoltagemeasurements atthe socket If you do not havethe correctvoltage at the socketconnector the problem is in the harness 2 Ifyou do havethe correctvoltageat the harnesssocket carefu...

Page 105: ...Y HEATH QTY DESCRIPTION No Part No RESISTORS All resistorsare 5 fourthband gold CIRCUIT Comp No KEY No HEATH Qry DESCRIPTION Part No CIRCUIT Comp No 1 4 Watt A1 6 122 12 A1 6 222 12 1 1200O brown red...

Page 106: ...ted 2114 443 764 lC scanbe dam agedby staticelectricity DO NOTremovethemfromtheir foampaduntilyouareinstructed to dosoin a step D3 443 764 2 2114 4045 40L45 or 6614 lC protected 1c507 1c516 SOCKETS _...

Page 107: ...tl L l t t tl L i T L J l t LJ tl tl L J O t tl L l i Position the circuit board as shown with the printed side up D501 FH1100 diode 56 s7 Match the band on the diode with the band on the circuit boar...

Page 108: ...iln nn ttll L i O n tl L l t _ tl LJ I I I I I f IIAA _IUU R514 2200O red red red Rs03 22ooA red red red 1 J R501 22OOQ red red red Y Rsr0 22ooA red red red R5L7 22OOO red red red R50B 22ooA red red r...

Page 109: ...ocketat an 18 pin socketlocation or a 14 pin socketin a 16 pin socketlocation fa Pin IC sockets at IC507 and IC516 Install t6 pin IC socketsat the fol lowing six locations IC501 rc502 IC513 IC518 IC51...

Page 110: ...s as each socket is installed e s501 s503 s502 ss04 l s pin plug Insertthe shortpins into the circuit boardholesand solderthe pins to the foil C512 1 pF ceramic J C509 1 pcFceramic C507 1 g Fceramic C...

Page 111: ...e capacitorwith the plus markon thecircuit board outline C503 1 g F ceramic C508 1 pF ceramic C511 1 g F ceramic C50 1 pF ceramic C505 1 pF ceramic C506 1 pF ceramic Solder the leads to the foil and c...

Page 112: ...refer to Detail 7 6A for proper identifica tion of oin 1 ICs26 74LS08 IC 443 780 IC521 74L575lC 443 787 1C527 74LSO2 lC 443 77s ICs28 74LS0olC 443 728 IC52a 74LS10IC 443 7s7 IC529 74LS03 lC 443 745 IC...

Page 113: ...emaining IC s will be installed later CIRCUIT BOARD CHECKOUT Visual Inspection Carefully inspect the foil side of the circuit board for the following most commonly made errors Unsoldered connections P...

Page 114: ...LECTOR_ RANGE METERINDICATION POSSIBLE AREAOFTROUBLE s501 1 s501 2 OHMS _ RX 1OOO GREATER THAN 1OOO O Check for solder bridgeson the foil especiallyaround the lC sockets With the negativemeter lead st...

Page 115: ...you pick up the IC 7 Pick up the IC and touch the foam pad with both hands 2 Hold the IC with one hand and removethe foam pad with the other hand 3 Continue to hold the IC with one hand and straighten...

Page 116: ...Page 114 RAM AND COUNTFR CIRCUIT BOARD PICTORIAL7 1 O 9u s c1 1 A 3 A 5 A 7 A...

Page 117: ...tration Booklet Page 2b for the following steps POSSIBLE CAUSE CHECKS 7 Removethe circuit boardand makethe samevoltagemeasurements at the chassisplug If you do not have the correctvoltage at the plug...

Page 118: ...Page 116...

Page 119: ...watl red violet brown 1000O l watt brown black red CIRCUIT Comp No optional use R629 R632 HEATH QTY DESCBIPTION PartNo 1 4 Watt A1 6 221 12 A1 6 271 12 A1 6 332 12 A1 6 472 12 A1 6 103 12 A r 6 393 12...

Page 120: ...sOrderForm andontheinsiderearcoveroftheManual Save defectiveor damagedcomponentsfor returninstruc Transistors lntegratedCircuits cont d D2 443 780 1 741508 lC D2 443 797 1 74LS10 rC D2 443 732 1 74LS3...

Page 121: ...rcuit board fln fr tl ll tl v t i Position the circuit board as shown with its printed side up r 2 white wire R603 47OO O yellow violet redl R615 220O red red brown Solder the leads to the foi and cut...

Page 122: ...ack yellow R616 47OO A yellow viole red D602 1N191 diode brown white brown 56 26 1 714 white between holes B andground Besureyou do not install this wire in the B fbase holeoftransistor Q60aby mistake...

Page 123: ...ations IC6o4 IC6os IC6o6 Install 20 pin IC socketsat the two following locations IC6o3 IC62o Install t6 pin IC socketsat the five following locations IC614 IC621 IC623 IC616 rC622 nfl _lf_lJl ii q Ins...

Page 124: ...he circuit board outline and insert the leads in the proper holes Then solder the leads to the foil and cut off the excess lead lengths LAT OR FLAT 1 Q602 SelectedFET transistor 4r7 897 v Q601 MPSA55...

Page 125: ...wn against the board as shown NOTE Install the next two plugs on the letteredsideof the circuit board Solderthe shortpins to the foil side oftheboardaseachplug isinstalled P6O1 25 pin plug P6Oa 25 pin...

Page 126: ...x mark on the circuit board See Detail 8 6A r r r Ll l I __1_G U Lejl iF T i 1 6 f ilil r1 i ItLH tt ffiit I I l ll L___l rl o l___Jll IC601 74LS2S3IC 443 7331 IC602 74L5293IC 443 733 IC603 74L5244IC...

Page 127: ...S30lC 443 732 IC61a 74LS42lC 443 807 J IC617 74LSo2IC 443 77s IC623 74L542IC 443 8071 IC62a 74LSo2lC 443 779 NOTE When you install the next two plugs only insert the short pins into the circuit board...

Page 128: ...of the IC with the index mark on the circuit board Then push the IC pins into the IC socket Once in the sockel the IC is protected IC612 TMS6011N protected IC 443 85e IDENTIFICATION DRAWING PART NUMBE...

Page 129: ...Page 127 0 c t q I tl _ tr I 4 1_r _5 l I C607 270 PF ceramic C602 1 pF ceramic I I Solderthe leadsto the foil side of the circuit board Cut off the excesslead lengths PICTORIAL 8 9 o 1 a 3 8 5 a 7 e...

Page 130: ...POS TTVE LEAD TO SELECTOR RANGE METERINDICATION POSSIBLEAREA OF TROUBLE P604 5 7 i ru ITHROUGW T tsgttrg OHMS Rx1000 GREATER THAN 50 KO Check for solder bridgeson the foil especiallyaround the lC soc...

Page 131: ...t n ttn PICTORIAL 8 1 0 f o ulg j L JVililtr fri i r r qY LJ l I Ft flUU L 7 lKllll lHH ff fln nn nn O nt HN...

Page 132: ...Pasel3o CRT BRACE IO CONNECTOR t ttt t SOCKET i l1 c S 1 l CONNECTOR SOCKEIS 4 Rttl rrr N L O 6 PICI ORIAI B 11...

Page 133: ...de of the boardl Position the CRT brace down so the angle bracketis in front of the circuit board asshown t Remount the brace to the rear panel at EG with the screw that was removed earlier Tighten th...

Page 134: ...an purchaseindividual replacementparts to do your own service KEY No HEATH Qry DESCRIPTION Part No 181 2679 2 CIRCUIT Comp No KEY No Resistors cont d A1 6 103 12 1 A1 6 223 12 2 A1 6 104 12 1 CAPACITO...

Page 135: ...notsignificant 3 Partnumber andtypenumber 4 Part number withatypenumber other than theone listed D1 417 801 1 MPSA2O transistor 0701 IMPORTANT Beloreyouopenany lC package and if anycomponents are miss...

Page 136: ...armup a cursor mark should appear in the upper left part of the screen NOTE If you do not obtain the correctresults in the following steps first recheckthe stepsto makesure thatyouperformed theoperati...

Page 137: ...ent characterkey down for each column As the last characterin the right column is printed the displayshouldshift left one column Set all of the keys to their up positions Referto Pictorial 9 2 for the...

Page 138: ...CHASSIS P604 6 DC 15V 5V POSSIBLECAUSECHECKS 1 Removesocket S604fromthecircuitboardandmakethesame voltagemeasurements atthesocket If you do not have the correctvoltage at the plug the problem is in t...

Page 139: ...on your eyesfor an extendedperiod of time than a brilliant brightness Adjust the FOCUScontrol onthevideocircuit board to obtain the best focus Look at the charactersin the center of the screenas you m...

Page 140: ...Page 138 MODFL LABELHOLDER TWI ST ON NUT 1 IODEL tA BEL S IDi PANII 6 32 x3l4 BLACKSCRTW PICTORIAL I1 7...

Page 141: ...their concavesidetoward the front panel Locatethe model label and removethe protec tive paper backing Then pressthe label into placein the model label holder Placethefrontpaneloverthekeyboardsothatit...

Page 142: ...ttn too IilSET IN lI IA JT lT I B c 2 tl tEt NU SE G qP I IIN INC a lASK GROOVE r r TFNSION SPRINGS ffi IENS 5 PRI t0N NGS Detail 11 zA...

Page 143: ...chassisasfol lows PositionthecabinetovertheCRTwith the front of the cabinet tilted slightly downward Position the window behind the front panel first then lower the rear of the cabinet into place Secu...

Page 144: ...GAN 49022 ATTN PARTS REPLACEMENT Phone Replacement parts only 616982 3571 U z f o UJ F o n o z J r THIS FORMIS FOR U S CUSTOMERS ONLY OVERSEASCUSTOMERSSEE YOUR DISTRIBUTOR DO NOTWRITEIN THISSPACE Thei...

Page 145: ...cedures voltagereadings and any otherinfor mationyou thinkmightbe helpful Pleasedo not send parts for testing unlessthis is specifi cally requestedby our Consultants Hints Telephonetrafficis lightesta...

Page 146: ...r a i AT H G O M PA N Y THE WORLD S FINES r BENTO T ELECTRONIC N HARBOR EQUIPMENT IN i 1 HE MICHIG KIT FORM LITHO IN U S A...

Search results

Summary of Contents for Heathkit H9

Reviews:

Related manuals for Heathkit H9

Brands by name

Popular brands

Heath Company Heathkit H9, Assembly Manual

Search results

Summary of Contents for Heathkit H9

Reviews:

Related manuals for Heathkit H9

Brands by name

Popular brands