OSBORNE COMPUTER CORPORA nON SCREEN-PAC
Contents
1. the heat sink is to draw to that point rather than to other components which might be damaged Place the heat sink on the shield behind the pre tinned area and in front of the coaxial casing Solder the pre tinned leads to the following locations A Connect the coaxial cable shield to Pin 7 of B13 B Connect the inner conductor to Pin 6 of B13 12 0 Install the Z 80 Microprocessor and Character Generator on the Logic PWB Connect the Logic PWB to the computer and verify proper operation in all modes before continuing 4 GCC 1 1A 13 0 Remove the Logic PWB from the computer Remove the Z 80 Microprocessor and the Character Generator Place the Logic PWB on a soft work surface with the video shafts towards you Hold the SCREEN PAC PWB component side up and align it with the Logic PWB as follows Refer to Table 2 and Figure 1 TABLE 2 PIN ALIGNMENT SCREEN PAC PWB LOGIC PWB Z 80 Microprocessor ALIGN WITH 40 PIN SOCKET Character Generator ALIGN WITH 24 PIN SOCKET 10 PIN CONNECTOR Pl ALIGN WITH 10 PIN CONNECTOR P9 SPACERS MAIN LOGIC BOARD KEYBOARD CONNECTOR RETAINER CLIPS FIGURE 1 5 OCC 1 1A 14 0 Press the SCREEN PAC PWB into place on the Logic PWB with the spacers on the pins Use caution not to bend or break any pins NOTE If the Double Density Option PWB has been installed you may need to make a diagonal cut in the stand off used to mount it to the Logic PWB This will allow the SCREEN PAC PWB2. PWB to OCC for upgrade or credit Examine the CRT Assembly It should contain 1 Video PWB If it contains 2 PWBs the CRT assembly must be replaced Return the Video Assembly to OCC for upgrade or credit Place the Logic PWB flat on a soft work surface component side up and the video shafts closest to you 2 OCC 1 1A 5 0 Examine the MONITOR ROM at location D12 of the Logic PWB If it is not revision 1 43 or higher replace it with the 1 44 ROM which is part of the kit The notch on the ROM aligns with the notch on the Logic PWB trace 6 0 There must be a jumper at jumper position J3 Install one if necessary 7 0 Remove the Z 80 Microprocessor from the Logic PWB It is located in Row C between columns 11 and 14 8 0 Remove the Character Generator from the Logic PWB It is located in Row A between columns 15 and 17 9 0 Examine the sockets on the Logic PWB where you removed the Z 80 and Character Generator If you see the manufacturer s name AMP on either socket DO NOT proceed with the installation The pins on the underside of the 80 column PWB do not fit AMP sockets correctly If the Logic PWB has AMP sockets replace it with a PWB without AMP sockets before continuing Return the PWB with AMP sockets to OCC for credit or upgrade 10 0 Remove the SCREEN PAC ribbon cable from the upgrade kit The cable has a 14 pin connector on one end 12 long wires and 2 shorter wires on the other end the 2 shorter wires red and ye
3. to be mounted next to the Double Density PWB Refer to Figure 1 15 0 Locate the 40 pin socket near the center of the PWB and the 24 pin socket near the edge of the PWB Refer to Figure 2 A Check there are no obstructions in the 40 pin socket by carefully probing each of the sockets with a sharp pin B Insert the Z 80 which you removed from the Logic PWB into the 40 pin socket of the SCREEN PAC PWB Align the notch of the Z 80 with the notch on the PWB trace C Insert the Character Generator which you removed from the Logic PWB into the 24 pin socket near the edge of the SCREEN PAC PWB Align the notch on the Character Generator with the notch on the PWB trace AN eo re SCREEN PAC PWB d d b ER HCHARACT 4 ve RSS SSS RNG EERE S AW gt N SS SS e tee zk Ss A een Zeie MAIN LOGIC PW FIGURE 2 6 GENERATOR t OCC 1 1A 16 0 Connect the ribbon cable from the Logic PWB to P3 on the 80 Column PWB Remove the 2 PWB Retainer Clips from the upgrade kit A Ze Insert 1 retainer clip into the hole on the Logic PWB between the ribbon cable and the keyboard connector Fasten the SCREEN PAC PWB to this clip Refer to Figure 1 Position the other retainer clip on the opposite edge of the SCREEN PAC PWB Fasten this clip into the hole between locations A13 and A14 Refer to Figure 1 Remove the RCA External Video Cable and template from the kit The V
4. OSBORNE COMPUTER CORPORATION SCREEN PAC OPTION INSTALLATION PROCEDURE FOR THE OCC 1 1A COMPUTER SBXNESO21 Prepared by XEROX Corporation XEROX Service Business Service Education amp Customer Support 1341 W Mockingbird Lane Dallas Texas 75247 OCTOBER 1933 OCC 1 1A PURPOSE INTRODUCTION TO THE SCREEN PAC OPTION The purpose of this document is to provide you with the procedures necessary to upgrade the OSBORNE COMPUTER CORPORATION OCC 1 1A COMPUTER to the 52 80 100 column screen option REQUIRED TOOLS Ill Tool kit WORDSTAR DISKETTE Wi Drill Bit XEROX part no 600T930 3 8 Drill XEROX part no 600T871 Micro Soldering Tip XEROX part no 600T1039 Soldering Heat Element 23 27 watt XEROX part no 600T1036 COMPONENTS IN THE SCREEN PAC OPTION INCLUDE NOTE The Logic PWB in the computer must be revision G or higher for installation 1 SCREEN PAC PWB With 2 Pin Spacers OCC part no 6N00001 01 1 SCREEN PAC Ribbon Cable and Clips OCC part no 5N00002 01 1 2732 Rev 1 44 Monitor ROM OCC part no 3A10082 00 1 SCREEN PAC Power Harness OCC part no 5N00005 01 1 RCA External Video Connector and Cable OCC part no 5N00006 01 1 Template OCC part no 3N00009 01 2 PWB Retainer Clips OCC part no JN00008 01 1 SCREEN PAC Users Guide and Extended Utility Disk o the Screen Pac Option Return earlier revision PWBs to OCC for upgrading until further notice OCC 1 1A amp SCREEN PAC are regist
5. TE Osborne 12 inch video monitors need an adapter cable for connection to the RCA External Video Connector OCC will provide this adapter to end users with these monitors 10 OCC 1 1A TABLE 3 SCREEN PAC TROUBLESHOOTING GUIDE PROBLEM Computer beeps when powered on Scrambled logo when computer is powered on Lines across screen in 52 and 30 Only 32 column format functions correctly 11 ACTION Turn power off for 5 seconds Then turn power on again Check Z 80 Microprocessor Z 80 connector and 40 pin socket for bent or broken pins Refer to SCREEN PAC users Guide and check SETUP program for 123 logical screen size Check Character Generator for secure fit and bent or broken pins Check power cable connections to power supply and SCREEN PAC PWB PUBLICATION COMMENT SHEET Please use this comment sheet to assist with identification of errors or needed improvements in this publication For specific errors include specific page numbers DATE NAME JOB TITLE MAILING ADDRESS PUBLICATION NAME OCC SCREEN PAC INSTALLATION PROCEDURE PUBLICATION NUMBER SBXNESO21 PAGE NO DESCRIPTION OF ERROR OR IMPROVEMENT Please mail this form to the following address XEROX CORPORATION 1341 W MOCKINGBIRD LANE MS301 DALLAS TEXAS 75247 ATTN DAVID LEESE MANAGER XSB SERVICE EDUCATION amp CUSTOMER SUPPORT
6. ered trademarks of the OSBORNE COMPUTER Corp WORDSTAR is a registered trademark of DIGITAL RESEARCH Inc OCC 1 1A SCREEN PAC OPTION INSTALLATION PROCEDURE If the computer is receiving both the Double Density amp the SCREEN PAC options complete the Double Density upgrade first 1 0 Before starting the installation of the option inspect the computer being upgraded as follows A B C Check the case handle and AC power panel for damage Check that all keys are in place on the keyboard Detach the keyboard from the unit Check the keyboard cable and connector for damage Check the keyboard connector on the front bezel for bent or broken pins Check the video monitor and contrast brightness knobs for damage 2 0 After completing the visual inspection turn the computer on 3 0 Verify computer operation in all modes of operation A B Load the OSBORNE Disk Exerciser program and select the SEEK TRACK function Step to track 16 Select the DRIVE TIMER function The reading should be 200 71 Clean the head replace the load pad and adjust R23 on the drive PWB if the reading are not within specification Inform the customer of any problems encountered up to this point 4 0 Using the Osborne Field Service Manual as reference remove the Logic PWB from the computer A Check the IC at location B13 on the Logic PWB If it is a Fairchild or SG SILICON GENERAL the PWB must be replaced Return the incorrect
7. ideo Cable includes a ground ring washer and 7 16 inch nut to secure it to the bezel Refer to Figure 3 The cable requires a inch hole through the front bezel next to the battery cutout The template will be used to position this hole correctly A Press the template into position against the front surface of the bezel Align the cutout on the template with the Battery cutout on the bezel Refer to Figure 3 Using the 3 3 drill and drill bit drill a hole through the front of the bezel at the point marked on the template Remove the template Remove the single pin connector from the video connector pin Remove the 7 16 inch nut flat washer and ground ring from the video connector pin Insert the video connector from the outside of the bezel through the inch hole Install the ground ring flat washer and the 7 16 inch nut on the video connector shaft Carefully tighten the nut until the connector is secure Plug the single pin connector into the video connector pin Y D 7 SS S EAN SN 5 d RUN SS D Deene e E GA ye Ki ke e Ge G ELLE EG 5 Gi 5 GEI v E SE S E NN Gu l Ce EE z eS e 5 e a fie mt Br A x NS RSS SS SCREEN PAC VIDEO HARNESS SINGLE PIN CONNECTOR RCA VIDEO CONNECTOR Ier SS 6 FIGURE 3 8 HEX NU FLAT WASHER GROUND RING U OCC 1 1A 18 0 Place the Logic PWB with the 80 column PWB connec
8. llow will not be connected A Attach a piece of double back foam tape OCC part no 7P70032 00 to the Logic PWB approximately inch in from the edge of the PWB centered between the Keyboard Connector and the video controls a With the ribbon cable connector towards you and the pins facing up press the cable to the tape approximately inch before the wires seperate Approximately 2 to 3 inches of the ribbon cable should be hanging off of the end of the Logic PWB C Using the low wattage heat element and the micro soldering tip connect the leads to the Logic PWB in the order listed in TABLE 1 OCC 1 1A TABLE 1 SOLDER CONNECTIONS NOTE The yellow wire on the edge of the SCREEN PAC cable is wire 1 LOGIC PWB SCREEN PAC CABLE IC LOCATION PIN NUMBER COLOR CODE WIRE NUMBER D17 14 GREEN 10 D17 13 VIOLET 8 D17 12 WHITE 6 D17 11 BROWN D16 gt BROWN 14 D16 4 RED 13 El3 l YELLOW l D14 gt ORANGE 12 B16 l GREY 7 Bil 12 BLUE 9 E22 12 BLACK gt D18 14 OR AN GE 2 NOT USED NOT USED RED 3 NOT USED NOT USED YELLOW 11 11 0 Remove the 80 column PWB from the kit The PWB includes a coaxial cable which has one end already connected The other end will be soldered to the Logic PWB To prevent the heat of the soldering iron from melting the shield of the inner conductor a heat sink must be used A heat sink can be an alligator clip needle nose pliers or surgical forceps which are attached to the item being soldered The purpose of
9. ted close to the keet D chassis A Remove the SCREEN PAC power harness from the upgrade kit B Attach the 4 pin connector with only 3 wires inserted on the To power harness to the unused DC output connector on the power supply With the Logic PWB held vertically connect the other 4 pin connector with only 2 wires inserted to P7 of the Logic PWB The spare connector is used for the external fan which is optional Secure the Logic PWB to the chassis verify the SCREEN PAC option is functioning correctly perform the following procedure Use the copy of the EXTENDED UTILITY disk which came with the kit Place a a write protect strip over the notch Insert the disk into drive A Insert a WORDSTAR disk into drive B Reference the SCREEN PAC USER S GUIDE to SYSGEN CP M from the EXTENDED UTILITY disk to the WORDSTAR disk Reference the SCREEN PAC USER S GUIDE to use the SETUP program with WORDSTAR in the 80 column format Insert the WORDSTAR disk in drive A and a formatted disk in drive B Boot WORDSTAR and log onto drive B The characters on the screen should appear smaller and shifted to the left If the screen does not display the 30 column format refer to the SCREEN PAC TROUBLESHOOTING GUIDE in this manual Reassemble the chassis and case except for the front bezel Connect the RCA External Video Cable to the 2 pin connector next to C16 and 126 Connect the front bezel to the chassis OCC 1 1A NO
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