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Heathkit H19 Manual

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HEATHKIT
MANUAL
HEATH COMPANY • BENTON HARBOR, MICHIGAN

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  • Page 1 HEATHKIT MANUAL HEATH COMPANY • BENTON HARBOR, MICHIGAN...
  • Page 2 If a defective part or error in design has caused your Heathkit product to malfunction during the warranty period through no fault of yours, we will service it free upon proof of purchase and delivery at your expense to the Heath factory, any Heathkit Electronic Center (units of Schlumberger Products Corporation), or any of our authorized overseas distributors.
  • Page 3 Heathkit® Manual for the VIDEO TERMINAL Model H19 ASSEMBLY 595-2191-07 Copyright © 1979 Heath Company HEATH COMPANY All Rights Reserved Printed in the United States of America BENTON HARBOR, MICHIGAN 49022...

  • Page 4: Table Of Contents

    Page 2 TABLE OF CONTENTS Introduction ..............3 Video Circuit Board ..........32 Parts List .............. 32 Unpacking Instructions ..........4 Step-by-Step Assembly ........35 Assembly Notes ............ 5 Installation And Checkout ......53 Main Pack ..............8 Terminal Base Assembly (Cont ’ d.) ......56 Parts List ..............

  • Page 5: Introduction

    Page 3 INTRODUCTION The Heath Model Hl 9 Video Terminal is a profes ­ • Keyboard enable/disable. sional, 24-line, video terminal. Not only does it have • Keyclick enable/disable. the features commonly found in other high-quality • Cursor type select (underline or block). video terminals, but it also has many exclusive fea ­...

  • Page 6: Unpacking Instructions

    Page 4 UNPACKING INSTRUCTIONS This kit is packed in two cartons. The smaller one Also locate one prewired circuit board and unassem ­ bled circuit board in the large carton. Set these aside contains the CRT (Cathode Ray Tube). Do not open this carton until you are instructed to do so.

  • Page 7: Assembly Notes

    Page 5 ASSEMBLY NOTES TOOLS You will need these tools to assemble your kit. HEATHKIT SOLDERING ASSEMBLY Follow the instructions carefully. Read the en ­ Most kits use a separate “ Illustration Booklet ” tire step before you perform each operation.
  • Page 8 Page 6 Each circuit part in an electronic kit has its own SOLDERING component number (R2, C4, etc.). Use these numbers when you want to identify the same Soldering is one of the most important operations you part in the various sections of the Manual. will perform while assembling your kit.
  • Page 9 Page 7 PARTS 1/4-WATT Resistors will be called out by their resistance value in (1 (ohms), kfl (kilohms), or MO (megohms). Certain types of resistors will have the value printed on the body, while others will be identified by a color code. Band 1 Band 2 Band 3...

  • Page 10: Main Pack

    Page 8 MAIN PACK PARTS LIST Check the parts in the main pack against this Parts To order a replacement part, always include the Part List and the Parts Pictorial (Illustration Booklet, Page Number and use the Parts Order Form furnished with 1).
  • Page 11 Page 9 HEATH QTY. DESCRIPTION CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT Part No. Comp. No. Part No. Comp. No. HARDWARE #10 Hardware NOTES: 10-32 x 1" screw 250-331 250-1318 #10 x 1-1/2" 1. The hardware may be in more than one packet. self-tapping screw Open all the hardware packets, according to their #10 flat washer...

  • Page 12: Step-By-Step Assembly

    Page 10 QTY. DESCRIPTION HEATH CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT Part No. Comp. No. Part No. Comp. Ni TOOLS Miscellaneous (cont ’ d.) 205-778 Alignment tool blade 265-39 Hinge 490-1 Alignment tool 266-944 Nylon guide 490-5 Nut starter (maybe located 490-185 Soder Wick* in pack #1).
  • Page 13 Page 11 © © PLACE THE SMALL END OF THE INSERT I NTO THE HOLE APPLY HEAT TO THE TOP OF THE INSERT WITH YOUR SOLDERING I RON, USING A SLFGHT DOWNWARD PRES ­ SURE. SEAT THE INSERT FLUSH WITH THE TOP OF HOLE.
  • Page 14 Page 12 Refer to Detail 1-1C and locate the left guide plate. Place this plate on the terminal base edge at AC and AD. Be sure the plate is positioned as shown. Refer again to Detail 1-1C and locate the left locking plate.
  • Page 15 Page 13 ® 8-32 NUT Detail 1-1E NOTE: If it is ever necessary to remove a spring con ­ nector from the connector shell, use a small screw ­ driver to depress the tab on the connector through the slot in the connector shell while you pull on the wire. See Detail 1-1E.
  • Page 16 Page 14 NOTE: When you are instructed to make a connection mechanically secure, as in the next step, first form a hook in the end of the wire. Then insert the hook through the lug and crimp it securely. See Detail 1-1G.
  • Page 17 Page 15 Solder one end of the 15" green wire to the other Locate 7 brass inserts. Then install the inserts in the locations listed below. Use the same proce ­ solder lug at DE. Then route this wire as shown. dure as you did before.
  • Page 18 Page 16 Detail 1-3B Mount a #6 solder lug at BA with a 6-32 x 3/8" Detail 1-3A hex head screw and a 6-32 nut. Position the lug as shown. AC CHASSIS ASSEMBLY AND WIRING In the same manner, mount a #6 solder lug at Refer to Pictorial 1-3 (Illustration Booklet, Page 4) for the following steps.
  • Page 19 Page 17 INSERT THE PREPARED END OF THE CABLE THROUGH THE SHOULDER ON THE STRAIN RELIEF AND BACK ------------------------------------ --------------------------------- == 1. REMOVE 1-1/2" OUTER INSULATION. CAREFUL THAT YOU DONOT CUT THE INSULATION OF THE INNER LEADS. 4 ---------------- 1 -1 / 2 11 --------------- 4 --------------- 1 -1 12"...
  • Page 20 Page 18 Connect the white line cord lead to switch SW1 Refer to Pictorial 1-4 for the following steps. lug 6. Make this connection mechanically sec ­ Position the AC chassis under the right rear corner of ure but do not solder the connection. the cabinet base and connect the power transformer leads as follows.
  • Page 21 Page 19 PICTORIAL 1-4...
  • Page 22 Page 20 Refer to Pictorial 1-5 and mount the AC chassis Locate the harness and place it in the terminal base with the two blue and two black wires into the AC housing with three 6-32 x 3/8" hex positioned near capacitor Cl. head screws.
  • Page 23 Page 21 6-32 x 3/8" BLK PHILLIPS HEAD SCREW CONTROL 6-32 x 3/8 (#11-53) PHILLIPS HEAD LARGE ■ SCREW NSULATOR POLARIZING PLUG TERM 1 NAL BASE 10-HOLE CONNECTOR SHELL REAR PANEL 6-HOLE CONNECTOR D-CONNECTOR SHELL HARNESS SOLDER SHORT 8-HOLE CONNECTOR __ SHELL -A<2) —...

  • Page 24: Power Supply Circuit Board

    Page 22 POWER SUPPLY CIRCUIT BOARD (Pack #1) PARTS LIST To order a replacement part, always include the Part Locate Pack #1 and check each part against the fol ­ Number and use the Parts Order Form furnished with lowing list. Any part that is packed in an individual this kit.

  • Page 25: Assembly Notes

    Page 23 ASSEMBLY NOTES ASSEMBLY just enough solder to make a good connection, and lift the soldering iron straight up from the Position all parts as shown in the Pictorials. circuit board. If a solder bridge should develop, Solder a part or a group of parts only when you turn the circuit board foil side down and heat are instructed to do so.

  • Page 26: Step-By-Step Assembly

    Page 24 STEP-BY-STEP ASSEMBLY CONTI NUEV ( ) Solder the diode leads to the cir ­ cuit board as follows: Push the soldering iron tip against both the lead and the circuit board foil. Heat both START for two or three seconds. In the following steps, you will be given detailed instructions on howto install and solder the first part on the...
  • Page 27 Page 25 A GOOD SOLDER CONNECTION “ i I" Solder Flows Outward And Gradually Blends Soldering A ■' With The Foil And The Iron Lead. . Positioned Correctly When you heat the lead and the circuit board foil at the same ’ time, the solder will flow evenly onto the lead and the foil.
  • Page 28 Page 26 START NOTE: Make sure you have installed the first diode in Pictorial 2-1. Install 1N2071 diodes (#57-27) in the Detail 2-2A following four locations. D109 D110 Dill D112 Install 1N4002 diodes (#57-65) in the following three locations. ) Solder the leads to the foil and cut off the excess lead lengths.
  • Page 29 Page 27 STARTS Install the plug as follows: Match the tab side of the plug with the double line of the outline on the board. Insert the short pins in the holes and solder them to the CONTINUED Do not install a part at this location. ( ) C103: 10,000 p.F electrolytic.

  • Page 30: Installation And Checkout

    Page 28 INSTALLATION AND CHECKOUT NOTE: The following test will require a high input Connect your negative ohmmeter lead to the impedance normal type volt/ohm meter. If you do not solder lug on the power transformer. have a meter we suggest that you borrow one as these measurements are very important to insure that your Set the POWER switch to OFF (ON side of unit will not be damaged when power is applied.
  • Page 31 Page 29 Make the following ohmmeter readings on plug 101 on the power supply circuit board. Permit the meter needle time to stop moving before you read it. POSSIBLE AREA OF TROUBLE Fuseholder (fuse not installed). Faulty wiring between switches and fuseholder. NEGATIVE POSITIVE OHMMETER...
  • Page 32 Page 30 ' Detail 3-2A POWER ON TESTS Refer to Detail 3-2B and prepare a 4" test wire as shown. First crimp and solder a female connec ­ Refer to Pictorial 3-2 (Illustration Booklet, Page 4) for tor pin onto a 4" solid black wire. Then slide the the following steps.
  • Page 33 Page 31 WARNING: When the line cord is connected to an AC POSSIBLE AREA OF TROUBLE outlet, dangerous AC voltage is present inside the AC housing. Do not operate the unit with the AC chassis Diodes D101 thru D112 installed backward or faulty. removed from the AC housing.

  • Page 34: Video Circuit Board

    Page 32 VIDEO CIRCUIT BOARD (Pack #2) PARTS LIST Locate Pack #2 and check each part against the fol ­ To order a replacement part, always include the Part lowing list and the Video Circuit Board Parts Pictorial Number and use the Parts Order Form furnished with (Illustration Booklet, Page 5).
  • Page 35 p age 33 KEY HEATH QTY. DESCRIPTION CIRCUIT HEATH QTY. DESCRIPTION CIRCUIT Part No. Comp. No. Part No. Comp. No. ■ ’ J. esistors (cont ’ d.) Polypropylene R208 1870 ft, 1/4-watt, 1% 6-1871-12 C229 29-56 .006 (brn-gry-viol-brn) 29-57 C232 R211 .51 ft, 2-watt 3-6-2...
  • Page 36 Page 34 CIRCUIT KEY HEATH QTY. DESCRIPTION KEY HEATH QTY. DESCRIPTION CIRCUIT Comp. No. Part No. Part No. Comp. No. Hardware (cont ’ d.) INDUCTORS — CHOKES — TRANSFORMERS 253-94 #3 flat washer 40-1947 H inductor L204 253-80 #4 flat washer L205 40-1948 H inductor...

  • Page 37: Step-By-Step Assembly

    Page 35 STEP-BY-STEP ASSEMBLY PART NUMBER CONTINUE NOTE: When you install a diode, al ­ ways match the band on the diode with the band mark on the circuit board. A DIODE WILL NOT WORK IF IT IS IN ­ START STALLED BACKWARDS.
  • Page 38 Page 36 PART NUMBER START CONTINUED ( } R217: 75 fl (viol-grn-blk). NOTE: Be sure to install the following diodes with the banded end as shown ( ) R219: 22 fl (red-red-blk). on the circuit board. { } R218: 33 fl (org-org-blk). ( ) D205: 6.2 V zener diode (#56-58).
  • Page 39 Page 37 PART NOTE: When you install IC sockets, position the socket so that the index mark on the circuit is visible after the socket is installed. Be sure all of the START pins go through the circuit board. Sol ­ der each pin to the foil.
  • Page 40 Page 38 PART NUMBER PICTORIAL 4-4...
  • Page 41 Page 39 PART START NUMBER NOTE: In the following steps, install each of the transistors as follows: Refer to the illustration example below and identify the E, B, and C leads of the transistor. Bend the B lead of each trans ­ istor toward the flat.
  • Page 42 Page 40 I HEATHKITj PART PICTORIAL 4-6...
  • Page 43 Page 41 PART START NUMBER NOTE: When you install ceramic capacitors, space the capacitor about 1/8" above the circuit board. This will prevent the coating on the leads from protruding through the circuit board and making soldering difficult. ( ) C214: 6800 pF polystyrene. Posi ­ tion the marked end of the capacitor towards the banded end on the circuit board.
  • Page 44 Page 42 PART NUMBER START Install the plugs as follows: Install the next transistor as follows: 1. Match the tab side of the plug Position the transistor so the with the double line of the metal tab, which is closer to outline on the board.
  • Page 45 Page 43 PART NUMBER Detail 4-9A 1- - START ( ) C205: 10 fj,F tantalum. ( ) C222: 100 pF ceramic. ( ) R212: 1500 fl (1.5k), 5-watt, 10%. Cut two 3/8" pieces of clear sleev ­ ing and slide them over the leads as shown in Detail 4-9A.
  • Page 46 ) C231: 1.5 p.F electrolytic. Install 1.2 fl, 2-watt, 10% (brn-red-gld) resistors at the following locations. ) R264 ..........( ) R263 ..........( ) C221: 4700 pF polystyrene. Posi ­ tion the banded end as shown on the circuit board. ( ) C219: .01 p.F ceramic.
  • Page 47 PICTORIAL 4-11...
  • Page 48 Page 46 PART PICTORIAL 4-12...
  • Page 49 Page 47 START PART NUMBER ( ) R271: 2 MO control. Install .02 /xF ceramic capacitors at the following three locations. ( ) C242: 47 ^.F electrolytic. Be sure to use the larger 47 /xF capacitor at this location. ( ) C232: .22 /xF polypropylene. ( ) C228: 22 fj.F electrolytic.
  • Page 50 MARK MARK SMALL RIDGE MARK ■■<••■■■ MARK Detail 4-14A PICTORIAL 4-14...
  • Page 51 Page 49 Q213: Refer to Detail 4-15B (Illustration Book ­ let, Page 6) and mount an MJ2841 transistor (#417-282) at Q213 as follows: Place a black shoulder washer into each mounting hole with the larger part toward the circuit board. Apply a small amount of thermal compound on the heat sink at Q213.
  • Page 52 Page 50 PART B PART A -40 x 1/2" SCREW #4 FLAT WASHER BARE METAL SIDE THERMAL COMPOUND SMALL TRANSISTOR INSULATOR #4 LOCKWASHER 4-40 NUT Detail 4-15C Cut three 1/4" lengths of fiber sleeving. Use this and a 2-56 nut. Do not overtighten this sleeving in the next three steps.
  • Page 53 Page 51 LARGE POLARIZING Solder the CRT leads to the circuit board holes as follows: Black wire to GND. Red wire to G2. White wire to G4. Green wire to hole Gl. Both brown wires to FIL. Yellow wire to K. Cut off any excess lead length on the foil side of the circuit board.
  • Page 54 Page 52 Prepare a 5" black stranded wire. Then connect CIRCUIT BOARD VISUAL CHECK the wire between solder lug B (S-l) and solder lug C (S-l). It is important that the following checkout procedure be done after the circuit board is completed. Cut two 18"...

  • Page 55: Installation And Checkout

    Page 53 INSTALLATION AND CHECKOUT POWER OFF TESTS Perform the following resistance measurements on the video circuit board. If you obtain the correct meter Refer to Pictorial 4-16 (Illustration Booklet, Page 7) for reading, proceed to the next test. If you do not obtain the following steps.
  • Page 56 Page 54 PICTORIAL 4-18...
  • Page 57 Page 55 POWER ON TESTS Refer to Pictorial 4-18 for the following tests. WARNING: MAKE SURE THAT THE FLYBACK CONNECTOR IS NOT CONNECTED TO THE CIR ­ CUIT BOARD PLUG. Connect the line cord plug to an AC outlet and set the POWER switch to ON.

  • Page 58: Terminal Base Assembly (Cont ' D.)

    Page 56 TERMINAL BASE ASSEMBLY (Cont ’ d.) FRONT PANEL AND CRT INSTALLATION Lift the box slowly, allowing the CRT to slide out onto the padded surface. Refer to Pictorial 5-1 (Illustration Booklet, Page 8) for If there is aplastic film over the face of the CRT, the following steps.
  • Page 59 Page 57 Insert a large polarizing plug in hole 3 of the same connector shell. Insert the spring connector on the yellow yoke lead into hole 1 of another 4-hole connector shell. In the same manner, insert the brown yoke lead into hole 3 of the same connector.
  • Page 60 Page 58 HEATHKIT^j PICTORIAL 5-3 KEYBOARD ASSEMBLY Mount the 4-key keypad (Red-Gray-Reset- Break) at location C with two #4 x 3/8" self ­ tapping screws. Position the keypad as shown Refer to Pictorial 5-3 for the following steps. and solder the pins to the foil.
  • Page 61 Page 59 6-32 x 3/8 HEX HEAD SCREW PICTORIAL 5-4 KEYBOARD COVER INSTALLATION In the same manner, install a keyboard bracket at DA and DB. Do not tighten this hardware. Refer to Pictorial 5-4 for the following steps. Locate the keyboard cover and place it painted Install a keyboard bracket at DC and DD.
  • Page 62 Page 60 KEYBOARD INSTALLATION Refer to Pictorial 5-5 (Illustration Booklet, Page 9) for the following steps. Refer to inset drawing #1 and identify the marked end of the flat cable. The marked end will have either a black triangle (A) on one end of the socket or stripe along the outside wire edge as shown.
  • Page 63 Page 61 Refer again to Detail 5-6A and mount the brack ets to the base with four 6-32 x 3/8" hex head screws. Slide the logic circuit board down into the nylon guides. Set the board into the rear grooves at the back of the terminal base. Posi ­ tion the board with the heat sink up and the component side forward.
  • Page 64 Page 62 HEATHKIT^j Refer to Pictorial 6-1 (Illustration Booklet, Page 9) for the following steps. Push the 4-hole socket with the blue and red wires onto plug P204 on the video circuit board. Push the 4-hole socket with the brown and yel ­...
  • Page 65 Page 63 HIGH VOLTAGE I LEAD HOUSING! Detail 6-1B Detail 6-1C WARNING: The voltage on the high voltage lead is Refer to Detail 6-1B for the next four steps. very high (especially next to the high voltage trans ­ former) and will arc to any other wires near it. Refer to Remove the screw and connector from the high Pictorial 6-1 and position all other leads away from voltage connector housing.
  • Page 66 Page 64 Connect the line cord to an AC outlet and set the POWER switch to ON. After a short warm-up time , a light raster should appear on the screen. If it does not, adjust con ­ trol G1 (R268) counterclockwise, as viewed from the left side, to cause the raster to appear.
  • Page 67 Page 65 NOTE: The next adjustment should be made in a Adjust the FOCUS control (R271) on the video circuit board for the best focus. darkened room. Recheck the display for proper alignment of the Turn control G1 (R268) on the video circuit screen.

  • Page 68: Possible Circuit Board Problems

    Page 66 POSSIBLE CIRCUIT BOARD PROBLEMS NOTE: Disregard this section unless you have a prob ­ Diodes or transistors installed in the wrong loca ­ lem on a circuit board. tion. Refer back to the steps where these compo ­ nents were installed and check the part num ­...

  • Page 69: Final Assembly

    Page 67 FINAL ASSEMBLY Refer to Pictorial 7-1 (Illustration Booklet, Page 10) for the following steps. Locate the long foam gasket and peel the protec ­ tive paper from one end for a length of approx ­ imately 3". Peel more paper off as you install the gasket.
  • Page 70 Page 68 In the same manner, turn a latch pin into the Remove the protective paper backing from the cabinet at ED. model label. Then press the label onto the lower bottom of the bezel cover on the front panel. Position the cabinet over the terminal and slide the cabinet hinges into the slots in the rear This completes the assembly of your Video Terminal.
  • Page 71 Manual and notes on hand when you call. Print all of the information requested on the parts order form Heathkit Electronic Center facilities are also available for tele ­ furnished with this product and mail it to Heath. For telephone phone or “...
  • Page 72 HEATH Schlumberger HEATH COMPANY • BENTON HARBOR, MICHIGAN THE WORLD ’ S FINEST ELECTRONIC EQUIPMENT IN KIT FORM LITHO IN U.S.A.
  • Page 73 Heathkit® Manual for the VIDEO TERMINAL Model H9 OPERATION 595-2017-03 Copyright © 1977 Heath Company HEATH COMPANY All Rights Reserved BENTON HARBOR, MICHIGAN 490 2 2 Printed in the United States of America...
  • Page 74 Hold Screen ..........RAM and Counter ............ 55 Timing and Processing Unit (TPU) ...... 57 SYSTEM CONSIDERATIONS Input/Output (I/O) ............ 66 Heathkit Computer System Interface Standards ............10 SEMICONDUCTOR IDENTIFICATION General Interfacing ..........12 Component Number Index ........68 READJUSTMENT Part Number Index ............

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