Wyse WY-30 Maintenance Manual Download

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Summary of Contents for WY-30

Page 1: ...WY 30 Maintenance Manual For Service Manuals MAURITRON SERVICES 8 Cherry Tree Road Chlnnor Oxfordshire OX9 4QY Tel 01844 351694 Fax 01844 352554 email maurltron dial pipex com I I I t ij 1 WYSE I f ...

Page 2: ...er 1 General Information describes the terminal including information about internal functions input output I O telecommunications environmental needs and operator controls Chapter 2 Removal and Replacement Procedures shows you how to take the terminal apart and put it back together again Chapter 3 Troubleshooting tells to fix problems with the terminal needed for troubleshooting a quick flowchart...

Page 3: ...terminal Appendix C Test Connectors describes how to make diagnostic hood test connectors Appendix D Display Inspection With the Reticle describes how to check the terminal s display with a special tool the reticle REFERENCE MANUALS The following publications provide additional information about the termina l WY 30 User s Guide Document 880093 01 WY 30 Programmer s Guide Document 880093 02 iv ...

Page 4: ... PROCEDURES Overview 2 2 Before You Start 2 2 Removing and Replacing Assemblies in the Keyboard Mod ule 2 3 Removing and Replacing Assemblies in the Terminal Module 2 5 3 TROUBLESHOOTING Before You Start 3 2 Troubleshooting Quick Reference Guide 3 3 Troubleshooting Flowchart 3 3 Troubleshooting Aids 3 8 4 ADJUSTMENTS AND ALIGNMENTS Before You Start 4 2 Power Adjustments 4 3 Does the Terminal Meet ...

Page 5: ...al PCB Logic 7 5 Terminal PCB Monitor Power Supply 7 7 APPENDIXES A Specifications A 1 B Connector Pin Assignments B 1 C Test Connectors C 1 D Display Inspection with the Reticle D 1 INDEX 1 1 LIST OF FIGURES 1 1 Keyboard 1 3 1 2 Terminal Dimensions 1 4 1 3 Operator Interfaces 1 5 2 1 Terminal Modules 2 2 2 2 Keyboard Assembly 2 4 2 3 Removing the Terminal Enclosure 2 6 2 4 Replacing the Fuse 2 7 ...

Page 6: ...Height D 3 D 3 Checking Straightness Pincushioning Centering and Vertical Linearity D 4 LIST OF TABLES 3 1 Troubleshooting Quick Reference Guide 3 3 3 2 Terminal Installation Checklist 3 8 3 3 Power On Self Test Error Messages 3 11 3 4 Diagnostic Self Test Error Messages 3 12 3 5 Terminal PCB Circuit Isolation Jumpers 3 13 4 1 Display Problems and Adjustments 4 7 4 2 Screen Areas Affected by Displ...

Page 7: ...nal Control 1 2 Input Output Devices 1 2 CRT Display 1 3 Communications Interfaces 1 3 Keyboard 1 3 Environment 1 4 Operator Interfaces 1 5 Keyboard 1 5 Power Cord 1 6 Communications Cable 1 6 AC Power Switch 1 6 Brigh tness Slideswi tch 1 6 Touch Tilt Screen Adjustment 1 6 Setup Parameters 1 6 Cleaning 1 7 1 1 ...

Page 8: ...T controller and associated control logic input output I O devices monitor and power supply circuitry and a CRT All circuitry is mounted on a single printed circuit board PCB the terminal PCB The microprocessor controls all basic functions MICROCOMPUTER The microcomputer comprises a clock and synchronization circuit program memory 4K of RAM a reset circuit and the heart of the terminal a 2 megaher...

Page 9: ... controlled and are defined in Setup Parameters in this chapter Both interfaces can communicate at data rates up to 38 4K bits per second bps Keyboard The keyboard consists of 83 keys mounted on a single sided PCB All keys are momentary action key switches The microprocessor periodically scans the keys checking for key closures Figure 1 1 shows the keyboard You can find a detailed description in C...

Page 10: ...pes of electrical or electronic equipment without serious interference They should avoid locations near strong magnetic fields that can distort and interfere with the operating or servicing of the video display Figure 1 2 Terminal Dimensions 2 14 Extended 1 12 Flat Ambient room temperature should never exceed 45 degrees Celsius 113 degrees Fahrenheit when the terminal is on however the terminal ne...

Page 11: ...uding the keyboard power cord and brightness slideswitch It also points out the MODEM and AUX ports Figure 1 3 Operator Interfaces Power ON OFF Power Cord Keyboard Plug the keyboard cable connector into the keyboard connector jack on the left side of the terminal 1 5 ...

Page 12: ...wer right corner of the front bezel Sliding the switch to the right increases the display brightness sliding it to the left decreases the brightness Touch Tilt Screen Adjustment The touch tilt screen adjustment is a spring controlled support flap on the bottom of the terminal enclosure A user can adjust the angle at which he views the screen by pushing or pulling the terminal bezel SETUP PARAMETER...

Page 13: ...tely Pressing the Y key saves the parameters that you keyed in Pressing the N key saves all changes temporarily The new parameters are effective only until you turn off the power Pressing the ESC key returns all parameters to their factory default values Pressing the ENTER key restores all parameters from memory before leaving setup mode 7 To return to a normal operation mode press any key The ter...

Page 14: ...board Module 2 3 Keyboard 2 3 Keyboard Cable 2 4 Keyboard PCB 2 5 Removing and Replacing Assemblies in the Terminal Module 2 5 Removing the Terminal Enclosure 2 6 Replacing the Fuse 2 7 Replacing the Terminal PCB 2 8 Replacing the CRT Yoke Assembly 2 10 Replacing the yoke 2 12 Replacing the Terminal Enclosure 2 13 Discharging the Anode 2 13 2 1 ...

Page 15: ...s all control logic power supply circuitry and the circuitry to amplify and display horizontal vertical and video signals on the CRT screen The keyboard module includes the keyboard PCB and the keyboard cable Figure 2 1 Terminal Modules Termlnal h Keyboard BEFORE YOU START Safety Warning This terminal contains high voltage Don t attempt to service the terminal without taking all the precautions ne...

Page 16: ...blies in the terminal ma sure you have the tools and materials listed below o No a Phillips screwdriver o No 2 Phillips screwdriver o Insulated flat blade screwdriver o Alligator clips o Digital multimeter or voltmeter o Nonscratch mat or surface o Fuse puller or small flat blade screwdriver REMOVING AND REPLACING ASSEMBLIES IN THE KEYBOARD MODULE This section describes procedures to remove and re...

Page 17: ...rilron dial pipeK com Tools required None To replace the keyboard cable see Figure 2 2 follow these steps 1 Turn the terminal off 2 Press the keyboard cable connector tab and pull the keyboard cable out of the keyboard 3 Press the other keyboard cable connector tab and pull the keyboard cable out of the left side of the terminal 4 Insert one end of the new keyboard cable into the keyboard connecto...

Page 18: ...ps screws and washers that hold the keyboard ESD shield on the keyboard PCB 7 Lift the PCB assembly out of the keyboard cover 8 Cover the under side of the new keyboard PCB with the keyboard ESD shield Replace the screws and washers Tighten 9 Fit the new keyboard PCB assembly back into the keyboard t cover 10 Replace the No 0 Phillips screw that holds the PCB assemb in place 11 Reattach the bottom...

Page 19: ...nal 2 Rest the display face of the terminal on a nonscratch surface 3 Disconnect the keyboard cable on the left side of the terminal enclosure 4 Remove two No 2 Phillips screws from the rear panel of the terminal enclosure 5 Remove two No 2 Phillips screws from the bottom of the terminal enclosure next to the back bezel 6 Lift off the terminal enclosure Figure 2 3 Removing the Terminal Enclosure 2...

Page 20: ...replace the fuse follow these steps 1 Remove the terminal enclosure 2 Use a fuse puller to remove the suspected fuse 3 Check the fuse If the fuse is broken or blackened push a new fuse into the fuse socket If the fuse is good push it back into the fuse socket 4 Replace the terminal enclosure see Replacing the Termina EnClosure for instructions Figure 2 4 Replacing the Fuse 2 7 ...

Page 21: ...r P201 from the termina I PCB Warning Handle the CRT neck carefully If you break it flying glass can injure anyone within a radius of six to ten feet 7 Disconnect the filament harness from the neck of the CRT 8 Unscrew the two Phillips No 2 screws securing grounding wires to the CRT chassis Caution Don t remove the Phillips screws directly underneath the rear panel on the terminal PCB They fasten ...

Page 22: ...Figure 2 5 Removing the Terminal PCB Back Bezel Bamer Plate Filament Harness 4PlastiC Studs Grounding Wires 2 9 ...

Page 23: ...n feet 7 Reconnect the filament harness to the CRT neck 8 Discharge the anode on the CRT see Discharging the Anode 9 Reconnect the anode lead 10 Replace the back bezel and both barrier plates 11 Replace the terminal enclosure and keyboard Replacing the CRT Yoke Assembly Tools required No 2 Phillips screwdriver Flat bladed screwdriver Alligator clips To remove the CRT yoke assembly see Figure 2 6 f...

Page 24: ... anode A CRT left standing for any length of time will develop a charge from the air and need to be discharged again 2 Place the assembly in the front bezel Make sure the anode faces the keyboard connector jack on the terminal PCB 3 Fit the chassis back into the bezel 4 Replace the four No 2 Phillips screws that secure the assembly to the chassis Tighten 5 Replace the terminal PCB and insulator sh...

Page 25: ... neck of the CRT see Figure 2 7 3 Remove the yoke To replace the yoke follow these steps Warning Before you reattach the yoke assembly you must discharge the anode A CRT left standing for any length of time will develop a charge from the air and need to be discharged again 1 Position the yoke on the neck of the CRT see Figure 2 7 2 Tighten the yoke lock 3 Replace the CRT yoke assembly in the termi...

Page 26: ...en 3 Replace the two No 2 Phillips screws on the bottom of the terminal Tighten Discharging the Anode Tools required Insulated flat blade screwdriver Alligator clips We have written specific warnings throughout this chapter about discharging the anode on the side of the CRT If you have never discharged the anode or need a review follow these instructions To discharge the CRT anode before removal s...

Page 27: ... the blade to the wire anode leads under the cap Listen for a popping or crackling sound 5 Remove the anode lead To discharge the anode before installation See Figure 2 9 follow these steps 1 Ground the shaft of an insulated flate bladed screwdriver 2 Touch the blade of the screwdriver to the anode Listen for a popping or crackling sound 3 Install the CRT Figure 2 9 Discharging the Anode Before In...

Page 28: ...g Quick Reference Guide 3 3 Troubleshooting Flowchart 3 3 Troubleshooting Aids 3 8 Installation Checklist 3 8 Checking for Continuity 3 9 Power Supply Check on the Terminal PCB 3 9 Power On Self Test 3 10 Diagnostic Self Test 3 11 Checking the Keyboard 3 12 Isolating Circuits 3 13 3 1 ...

Page 29: ...ect the anode from the anode lead make sure to discharge the anode as directed in Chapter 2 o If you need to remove or replace the CRT yoke assembly remember that the CRT can implode if you drop it or break the neck The flying glass can injure anyone within a radius of six to ten feet Required Tools Before you start to repair in the terminal make sure you ha ve the tools and materials listed below...

Page 30: ...ils diagnostic test Inoperative keys Can t communicate with computer Letters or error codes on the screen Touch tilt doesn t respond correctly Adjustments terminal PCB Adjustments terminal PCB yoke Terminal PCB Terminal PCB wrong diagnostic setup faulty test connectors Keyboard terminal PCB keyboard cable Setup parameters terminal PCB communication cable Terminal PCB Touch tilt screw tension TROUB...

Page 31: ...Legend 1 Replacing the Fuse page 2 7 2 Replacing the Terminal PCB page 2 8 3 Checking the Power Supply page 4 3 4 Replacing the CRT Yoke Assembly page 2 10 5 Aligning the Brightness page 4 8 6 Aligning the Display page 4 6 7 Replacing the Yoke page 2 12 8 Running the Diagnostic Self Test page 3 11 9 Checking the Keyboard page 3 12 10 Checking the Communications Cable page 3 8 11 Replacing the Keyb...

Page 32: ... mauritron dial pipex com 3 5 Terminal Troubleshooting Flowchart Legend 1 Replacing the Fuse page 2 7 2 Replacing the Terminal PCB page 2 8 3 Checking the Power Supply page 4 3 4 Replacing the CRT Yoke Assembly page 2 10 5 Aligning the Brightness page 4 8 6 Aligning the Display page 4 6 7 Replacing the Yoke page 2 12 8 Running the Diagnostic Self Test page 3 11 9 Checking the Keyboard page 3 12 10...

Page 33: ...ACE TERMINAL oCB Terminal Troubleshooting Flowchart Legend 1 Replacing the Fuse page 2 7 2 Replacing the Terminal PCB page 2 8 3 Checking the Power Supply page 4 3 4 ReplaCing the CRT Yoke Assembly page 2 10 5 Aligning the Brightness page 4 8 6 Aligning the Display page 4 6 7 Replacing the Yoke page 2 12 8 Running the Diagnostic Self Test page 3 11 9 Checking the Keyboard page 3 12 10 Checking the...

Page 34: ...Troubleshooting Flowchart Legend 1 Replacing the Fuse page 2 7 2 Replacing the Terminal PCB page 2 8 3 Checking the Power Supply page 4 3 4 Replacing the CRT Yoke Assembly page 2 10 5 Aligning the Brightness page 4 8 6 Aligning the Display page 4 6 7 Replacing the Yoke page 2 12 8 Running the Diagnostic Self Test page 3 11 9 Checking the Keyboard page 3 12 10 Checking the Communications Cable page...

Page 35: ...t Room temperature is between 40 and 91 degrees Fahrenheit 5 and 33 degrees Celsius Terminal isn t near a magnetic field Keyboard Keyboard cable is in the keyboard connector jack on the left side of the terminal Keyboard cable is in the connector jack on the rear of the keyboard AC Power Cord Female end of the power cord is plugged into the AC power socket on the rear panel of the terminal Male en...

Page 36: ...se or internal connections Check this list then with an ohmmeter check the continuity of the components listed below Outside the terminal check the o Power cord o Communication cable supplied with the computer Inside the terminal check the o Fuse o AC power input receptacle on the rear panel of the terminal o Terminal PCB to the CRT yoke wiring harness Hold the probes in place for five seconds or ...

Page 37: ...7 C31 6 If one or more of these voltages are not in tolerance adjust VR101 7 If you adjust VR101 and the voltage or voltages are still not within tolerance replace the terminal PCB Power on Self Test The power on self test checks the terminal s random access memory RAM read only memory ROM electrically eraseable read only memory EEROM and external communication ports Each time you turn the termina...

Page 38: ...n After you start it the diagnostic test continues to run until you stop it If the test detects an error an error message appears in the lower right hand corner of the screen see Table 3 4 for error message de fini t ions Follow these steps to start the diagnostic self test 1 Turn the terminal off 2 Detach any communications cables on the back of the terminal 3 Attach the test connectors to the MO...

Page 39: ...ror Messages Error Message Failure A RTS to CTS data communications error on MODEM port C DTR to DCD data communications error on MODEM port K EEROM data check sum error o RAM error X Transmit receive data error on MODEM port Y Printer port error 9 EEROM read write diagnostic self test error P Program ROM check sum error Checking the Keyboard If you suspect the keyboard is the source of the proble...

Page 40: ...cuitry Table 3 5 is a list of jumpers on the terminal PCB and the areas they isolate For an exact location see the terminal PCB component layout in Chapter 5 Table 3 5 Terminal PCB Circuit Isolation Jumpers Jumper Areas Isolated J525 Ground from logic J526 J524 Power supply from logic J527 J543 Video circuit Logic from monitor circuitry J522 Vertical synchronization Logic from monitor circuitry J5...

Page 41: ...4 2 Power Adjustments 4 3 Does the Terminal Meet the Display Specifications 4 4 Aligning the Terminal Display 4 6 Adjustments 4 7 Height 4 7 Vertical Hold 4 7 Lineari ty 4 8 Brightness 4 8 Focus 4 9 Wid th 4 9 Display Leveling 4 9 Display Magnets 4 11 Cen tering Rings 4 12 4 1 ...

Page 42: ...pter 2 Discharging the Anode o If you need to remove or replace the CRT yoke assembly remember that it can implode if you drop it or break the neck The flying glass can injure anyone within a radius of six to ten feet Tools Required Before you test the power supply voltages or make any adjustments to the power supply or monitor assemblies make sure you have the tools listed below o Flat bladed non...

Page 43: ...upply follow these steps 1 Turn the termina I off 2 Unplug the power cord from the back of the terminal If communications cables are attached to the back of the terminal detach those too 3 Place the terminal on its face and remove the terminal enclosure and back bezel see Chapter 2 4 Plug the terminal into an AC power source 5 Turn the terminal on 6 Check the 5V supply at R15 on the terminal PCB u...

Page 44: ...d alignment turn off the terminal unplug it and replace the top cover If the display needs alignment go to Aligning the Terminal Display DOES THE TERMINAL MEET THE DISPLAY SPECIFICATIONS Before you adjust the display on the monitor measure the screen margins and study the display following the procedure below Note If you have just finished checking and adjusting the power supplies go to step 4 1 T...

Page 45: ...that curve outwards o Pincushioning display edges that curve inwards o Display edges aren t straight o Display is too wide or too narrow o Display is too high or too short o o Display isn t centered or level Poor focus For Service Manuals MAURITRON SERVICES 8 Cherry Tree Road Chlnnor Oxfordshire OX9 4QY Tel 01844 351694 Fax 01844 352554 emall maurilron dial plpex com o Too dim or too bright o Poor...

Page 46: ... the test connectors to the MODEM and AUX ports on the rear panel Note See Appendix C for a description of these connectors and instructions for making them 4 Plug the power cord into the back of the terminal and turn it on Let it run for 30 minutes If it has already run for 30 minutes continue the procedure 5 Hold the SHIFT key then press the SETUP key 6 Press CURSOR DOWN fi ve times Look for the...

Page 47: ...rners sag or move out of specification ADJUSTMENTS Height 4 7 Width 4 7 Vertical hold 4 7 Centering rings 4 12 Yoke lock 4 9 Disp lay magnets 4 10 This section contains detailed instructions for each adjustment mentioned in Table 4 1 Figure 4 2 can help you to identify adjustment locations on the terminal PCB Height The height adjustment is labeled VR302 on the terminal PCB Adjust VR302 until the ...

Page 48: ... top Brightness You can adjust bright and dim separately Although you can adjust them independently it s a good idea to adjust bright first and then dim 1 Slide the brightness slideswith as far right as possible full brightness 2 Turn VR202 on the terminal PCB as far clockwise as possible You should see the raster lines on the screen 3 Slowly turn VR202 counterclockwise just until the raster is no...

Page 49: ... the width coil The magnetic properties of a metal tool will affect the adjustment The width adjustment is labeled L202 on the terminal PCB With a hex nonconductive alignment tool adjust L202 until either side of the display is 11mm 2mm from the edge of the bezel Display Leveling The yoke lock is located on the neck of the CRT see Figure 4 3 To level the display follow these steps 1 Loosen the yok...

Page 50: ...Figure 4 3 Yoke Lock on the CRT Neck Yoke Yoke Lock Centering Ring Magnets Display II _ II I I I I I i I I i I I Rotate Yoke To Level Display 4 10 ...

Page 51: ...fect adjacent areas Figure 4 4 identifies each magnet Table 4 2 identifies which portion of the screen each changes Figure 4 4 Display Magnets 7 5 3 Table 4 2 Magnet Number Screen Areas Affected by Display Magnets Area Affected Top 2 Upper left corner 3 Left 4 Lower left corner 5 Bottom 6 Lower right corner 7 Right 8 Upper right corner 4 11 ...

Page 52: ...en turned they move the display position on the screen Figure 4 5 shows the rings If the display isn t in the center of the screen tu n the rings until it is then make height and width adjustments described on pages 4 7 and 4 9 Figure 4 5 Centering Rings Centering Ring 4 12 ...

Page 53: ...RATED PARTS LIST Introduction 5 2 Terminal Display Assembly Exploded View 5 3 Keyboard Assembly Exploded View 5 4 Terminal Components List 5 5 Keyboard Components List 5 8 Terminal Board Assembly Layout 5 9 5 1 ...

Page 54: ...ings with a specific part name and part number When you order replacement parts please give both the part name and the part number In the second part of this chapter we list all piece parts their values or generic industry numbers when relevant and locations on the terminal PCB or the keyboard PCB Table 5 1 lists components on the terminal PCB Table 5 2 lists components on the keyboard PCB Figure ...

Page 55: ...7 01 Back Bezel Assembly 830018 01 Terminal Display Assembly Exploded View Barner Plate Power On Off AC Switch 710049 01 AC Socket 840266 01 Pow 340C Module Jack 560009 01 Bezel Front 710053 01 Operator Brightness Key Slide 710052 01 5 3 ...

Page 56: ...Figure 5 2 Keyboard Assembly Exploded View Module Jack 560009 01 Keyboard Cable 94 038 03 Keyboard peBA 990067 01 Keyboard Assembly 5 4 840013 01 ...

Page 57: ...T IC 4016 2K x 8K STATIC RAM PPT IC 2661 B PPT IC CRT CNTL 6845RA 2MHZ PPT IC 68BOO MICROPROCESSOR PPT IC 1488 PPT IC 1489 PPT IC ADJ SHUNT REGULATOR PPT IC TDA 1170N PPT IC 4N35 PPT IC GATE ARRAY VIDEO ER5911A 1024 BIT EEROM PPT RES VAR 1K OHM PPT RES VAR 100K B PPT RES VAR 100K B PPT RES VAR 200K B PPT RES VAR 2MEG B PPT RES VAR 500 OHM PPT RES VAR 100K A PPT THERMISTOR SG 15 50HM 1A PPT RES CF ...

Page 58: ... CF 180K OHM 1 4W 5 PPT RES MOF 12 OHM 2W 5 PPT RES WW 1 5 OHM 3W 5 PPT RES MOF 1K OHM 2W 5 PPT RES CF 330K 1W 5 PPT RES CF 120K OHM 1 2W 5 PPT RES CF 1 OHM 1 2W 5 PPT RES CF 3K OHM 1 4W 5 PPT RES CF 10 OHM 1 2W 5 PPT RES MOF 33 OHM 1W 5 PPT RES CF 220K OHM 1 2W 5 PPT RES MOF 560 OHM 1W 5 PPT RES MOF 1K OHM 5W 5 R225 R309 R218 R303 R304 R306 R108 R107 R12 R14 R15 R16 R219 R214 R313 R10 R11 R2 R9 R...

Page 59: ...NSISTOR BSX 59 PPT LED 5219 PPT COIL CHOKE 10UH 1 5A PPT CRYSTAL 19 6614MHZ HC18 W PPT CAP CD 01MF 1KV PPT CAP CD 001MF 50V PPT CAP MG 1MF 50V AXIAL PPT CAP CD 1000PF 500V PPT CAP MG 220PF 50V AXIAL PPT CAP CD 680PF 50V PPT CAP 22PFAXIAL 50V PPT CAP MG 330PF 50V K PPT CAP MPF 22MF 100V PPT CAP CD 560PF 1KV K Y5P PPT CAP CD 330PF 500V K Y5P PPT CAP CD 1000PF 1KV Z PPT CAP CD 100PF 50V K Y5P PPT CAP...

Page 60: ...PEE 22UF 100V K PPT CAP MICA 56PF PPT CAP INTERF SUPP 47MFD 250VAC PPT CAP INTERF SUPP 1MFD 250VAC PPT CAP 0047MFD 250VAC Y PME271YA4L470M FIF PPT CAP MG 1000PF 50V KX7R PPT CAP MK 200PF 50V J NPO PWR TRANSFORMER EI 40 DRIVE TRANSFORMER HOR DRIVE TRANSFORMER FLYBACK LINE FILTER COMMON CHOKE 18MH C310 C112 C113 C37 C39 C309 C311 C211 C105 C106 C114 C115 C205 C4 C203 C107 C302 C303 C304 C307 C213 C2...

Page 61: ...401 I J545 I W R219 f r J543 J544 1 J549 _ J551 C21 C309 R OI If C O J Q J729 UIO _ _ 1 oNv 0403 I I l J728 J730 U18 J552 R2l7 l204 IR409 I v I R410 r J727 I I J735 T Rm 1 J558 C I B U5 R22 J5 7 I I f __ 737 __ I WI WI 0 1 E C J7261 I IJ564 I j i l4 VR201 f RJOG R31l Q403 I I r __J ff i J55 YHE B GPI tf _ r R218 R3D7 J55b R408 J t VGP12 fC20G 13J Q j c307 O O O1 560 U7 J563 J14J R2B UI7 u b L C305...

Page 62: ...Table 5 3 Diagnostic Self Test Connectors Part Part Number Connector set MODEM port connector AUX port connector 940268 01 940270 01 940267 01 5 10 ...

Page 63: ...deo Character Data 6 9 Screen Attributes 6 9 Input Output Devices 6 10 Power Supply and Monitor Circuitry 6 10 Power Supply 6 10 Circuit Protection 6 11 Display Monitor Circuitry 6 11 Vertical Deflection 6 11 Horizontal Deflection 6 12 Focus and Brightness Circuits 6 12 Video Amplification 6 13 Keyboard 6 13 Communication Ports 6 13 Terms and Abbreviations 6 13 For Service Manuale MAURITRON SERVIC...

Page 64: ... scanning the keyboard controlling the video circuitry transferring data to and from the serial ports and performing data manipulation tasks such as inserting or deleting data from the text shown on the screen The terminal s microcomputer is built around the 2 megahertz version of the 6800 CPU the 68800 The microcomputer is the combination of this CPU together with several other components a two p...

Page 65: ... Receive Holding Reg READ Status Register READ Mode Registers READ Command Register READ Transmit Holding Reg WRITE SYN 1 SYN2 DLE Reg s WRITE Mode Registers WRITE Command Register WRITE NOT USED Addresses UART KEYBOARD CLOCK WRITE ONLY Writing xxxx xxx1 to this Iccatlon clocks the keyboard once Writing xxxx xxxOb to this location clears the keyboard Counter Writes to any address In this block per...

Page 66: ...MAIN PROGRAM ROM This is one of two SK pages of ROM Note that ALL inter rupt vectors and routines must be In the exact same location in both pages l Video Interface and Synchronization The video interface includes both the CRT controller CRTC and the video attribute and dot logic The video interface is completely synchronized with the CPU This eliminates the need for a row buffer while allowing th...

Page 67: ...te decoding It simultaneously goes t the character latch The character latch together with the pixel row number from the gate array selects a row of pixels to be displayed from the character generator The character generator is a ROM that contains pixel patterns for each displayable character whose outputs go back to the gate array tr be displayed on the screen 68B45 CRT Controller Parameters Thes...

Page 68: ...efore it is displayed allowing indirect row addressing When this interrupt occurs the processor has the length of time of 12 scan lines 604 mSec to load the row offset register with the offset value for the next row Note The 8 bit value loaded into the row offset register is added to bits 4 through 11 of the 12 bit address produced by the CRTC This indicates three operating conditions o Rows must ...

Page 69: ...shift register C Cursor E Display enabled not retracing L Scan line 11 last scan line N Nonhidden serial attribute o Output of blink oscillator BL 0 AND B UL U AND L VIDEO E AND N AND BL AND S AND V OR UL XOR R XOR C DIM E AND NAND D Video Character Data The video character data is generated by the character generator and sent to the gate array This data is combined with the attribute data and app...

Page 70: ...first vertical blanking row to 0 and to set the first byte of the second blanking row to contain the current screen attributes The bits within the SAB are assigned as follows Bit Position 7 6 5 4 3 2 1 o Function Protect double wide Alternate attribute mode ATM True reverse Protect reverse Protect underline Protect blank Protect blink Protect dim Note If both Protect Blink and Protect Blank are se...

Page 71: ...sformer T102 synchronizes the 19 8 kHz horizontal sweep rate with the switching rate to reduce the noise that high frequency generates The flyback transformer T202 generates the horizontal sweep rate when it receives the horizontal sync signal from the CRT controller chip The secondary windings provide three voltage taps 54 VAC 24 VAC and 48 VAC 54 VAC is half wave rectified by D108 smoothed by LC...

Page 72: ...hold synchronizes the vertical synchronization input at pin 8 with the oscillator Vertical Size VR202 controls the amplitude of the internal vertical RAM generator Adjusting VR202 affects the pin 4 output which changes the vertical dimension of the raster To obtain sufficiently short flyback times the internal flyback generator do bles the input voltage at pin 5 applying it to the vertical yoke th...

Page 73: ...cus and Brightness Circuits The focus and brightness circuits contain the following components and controls Focus is controled by static focus control VR201 The signal for the horizontal dynamic focus is picked up from damping diode D202 boosted through C206 and L204 and applied to the focus grid together with the static focus voltage Brightness and sub brightness controls VR203 and VR202 are conn...

Page 74: ...andard modern handshaking signals TxD RxD RTS CT DCD The AUX printer port sends only one output RxD and one input DTR The input connects with the DSR input of the UART The unused outputs CTS DSR DCD are tied high active with a 1K resistor to 12 volts The DTR input is connected to two pins pin 20 DTR and pin 11 PRDY to allow connection to both Epson style and Oki style printers TERMS AND ABBREVIATI...

Page 75: ...el Picture element raster display screen This is the basic unit of a It appears as a dot on the RAM ROM UART Random access memory This device contains display data communication buffers and all other changeable data All data in RAM is lost when the power is turned off Read only memory The terminal s program memory and charac ter generator are ROM This data isn t lost when the power is turned off U...

Page 76: ... 960066 01 7 3 7 7 Monitor Power Supply This chapter contains schematic diagrams for the terminal s keyboard PCB and terminal PCB to help you troubleshoot the terminal For Service Menue e MAURITRON SERVICES 8 C rry Tree Roed Chlnnor ordehlre OX9 4QY Tel 01844 351694 Fax 01844l 352554 emall maurllron dial I p pex com 7 1 ...

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Page 82: ... 1 CUAI IACTEQ LATCU MAS 9 2 U7 l E 1 2 Sf 2 7 LSO 01 15 O 22PX _ rx 1 MAG 1 AS L r 3 A 1151 A AlA 7 If l lll a h11 12 ua __ I 8 5 7b 2 D 07 9 61 12 1 51 5 1Z I 1 7 5 lHfs1 l21 Z31 I j k 0 Ult V z L _ A914 1 1159 7 l500 9 4 Vilr N C j 4 RA A y Si 5 OEf1 2tl lvpp Uf2 UAPAcrER rc tl c ll 6 26 6LNfRATOR Z764 QUl4 lore I_ MA12 t215 3 7 _ II l8 cs NC VALENT WYSi i 2301Z9 QI 2 17 2 co itA A1AlU4 3 VJ L ...

Page 83: ... U5 10 9 0 U4 0 e DISPLAY RAM iN SOCKEI o e I Z 5 7 L504 1 1 r _ _ _ _ W y _ O 1 Ia a _ __ r 1 Llc nON 1 n o G LE P OJ E C T O I _ __ u_ ___ SC 1 1 MATIC LOGIC 1 L _l l E3 t I D t D sc O I y O 6l O O 6 6 O fTt Jd B I 00 or SCAlE Dlu e SCALf 1_ 1 I OF 2 4 3 2 I 1 ...

Page 84: ...17 Il I cr R r e9A 1t 701 Cl via JnQPFL C08e s _ orre I _ 141A t 33 0 17 7 2 orR I B N C U RA Z Ie l c T I DSR Cltl I Q lpF r OCO lIe _ I D Lt Ul1 rr ID f N N C II SPlNll NORMI lN GA1 ARRAY TO V DfO 1_1_ r _ _ WYSE eo 43 5 IZ IN JaCKEr HSYNC f YIU21Y 1 N C I fl III 1 2 I DiM H C 7 04 I YN 7lfL 139 TllO N C __ 0 05C1LlATOA t c s r t I _ _ el2 I Cl9 24 C25 Tlc s A c c g i 16 H C _ W WYSE TECHNOl v O...

Page 85: ...Figure 1 3 Terminal PCB Schematic Monitor Power Supply 7 5 D c B A fEJf sJ 1 Pjll_l _ ya llO 700 Y H I Jl01 b17fN 1C1 00 5 11 0 _ _ _ _ _ _ pi e 4 J c J I fl r o o 2L11 IC 7 7 7 5 ...

Page 86: ...Supply tor Power I onl 3 4 5 J__ lS _ 1 4 I f r 6 r 5 t 4 3 I 00 1 MATS UST ...

Page 87: ...0 U I W TC D i I ___ 1 _ D H C I j I I I ___ J __ __ _ 1 ISS OT WlSI C IO l 5IOOoS lIlt _ TOt l IICI r i IIlACTtQlft c MlCln m 30 WYSE TECHNOLOGY WY 30 M PS SCHEMATIC DO Of CAlor O AWlN 1 1 4 1 CO 1 g QOS QI Jl I 1 2 c 2 1 1 _ _ l L _ _ 1 I 3 I 2 I 1 ...

Page 88: ...__ c y f ll w rf hl r m JQ l oo 1 1m tI __ 11 __ __ 1 _ Ii I LIII f lY l I I L J L C _ 3 _ __ c u_ u jlt f 1t L__ _ _ L L iT on r _1 __ i l _ I e li i cC r r ol I r __ _ W I r _ C I _ r r 1 1 1 C_ J Lp 1 1 _l 1 Y r 1 _ f I _ IJ f 1is i 1if Q f 1 b tJ II I d 1 J C I 1 rO r I r Ir r J J nl K _ 1 10 elI I h l f i 9 J I l d c Y j 1 1 J c 1 i 1 I 1 I 1 w S g _____ IT or Tlel I 1 1 1 L F1 t 1 1 12 g I T...

Page 89: ... Vertical Resolution Horizontal Vertical Display Format Horizontal Vertical Font Density Horizontal Vertical Character Cell Horizontal Vertical A 1 115 230 VAC 47 to 63 Hz 42 watts 125V 2 0 ampere fast blow 10 to 40 degrees Centigrade 40 to 60 degrees Centigrade 10 000 feet ASL 40 000 feet ASL 20 to 80 noncondensing 19 858 to 19 862 kHz 19 860 kHz nominal 59 994 to 60 006 Hz 60 000 Hz nominal 40 4...

Page 90: ...max 0 400 ms max 23 7 mm 2 37 mm 172 mm 2 37 mm 50 fL 8 fL 17 fL 8 fL 50 12 12 4 00 mm 1 185 mm Neck north 30 minutes Meets FCC rules and regulations Part 15 Subpart J Class A Regulatory Agencies UL 478 and CSA C22 2 no 154 approved Dimensions Terminal Screen Keyboard Shipping Weight Movement Phosphor A 2 11 5 H x 12 5 W x 13 D 29cm x 32 cm x 33 5cm 14 diagonal 35cm 2 2 H x 16 4 W x 5 5 D 5 5cm x ...

Page 91: ...ls Dim blink blank underline reverse protect and combinations Block underline with or without blinking M For ServIce Manuall 8 c URITRON SERVICES erry Tree Road Chlnnor Oxfordlhlre aX9 4QY Tel 01844 351694 Fax 01644 352 emall _ maurltron dialp5 lp 54 ex com A 3 ...

Page 92: ...a output 3 Receive data input 4 Request to send output 5 Clear to send input 7 Signal ground 8 Data carrier detect input 20 Data terminal ready output Table B 2 AUX Port Pin Assignments DTE Pin Signal 1 Frame ground 3 Transmit data output 5 Clear to send output 6 Data set ready output 7 Signal ground 8 Data carrier detect output 11 Printer ready input 20 Data terminal ready input B 1 ...

Page 93: ...nnectors referenced in Chapters 3 and 4 If you prefer you can order sets of them See Chapter 5 MODEM PORT Use a male DB 25 pin connector Connect these pins signals Pin 2 to Pin 3 TxD to RxD Pin 4 to Pin 5 RTS to CTS Pin 20 to Pin 8 DTR to DCR AUX PORT Use a male DB 25 pin connector Connect these pins signals Pin 3 to Pin 20 RxD to DTR C 1 ...

Page 94: ...fication Figure D 1 shows the reticle and its markings Figure D 1 Video Inspection Reticle Maximum Display Height I1Il rIT l t t IJ Minimum Straightness Display Height Tolerance Minimum Display I Width I i t I i I I Linearity I I I I I I i I I i I Straightness i Straightness Tolerance I Tolerance r l I Maximum i h I I Display I Width i Minimum Straightness Display Height Tolerance r I 1 t LV Maxim...

Page 95: ... range everywhere See Appendix A for linearity tolerances Distortion that results if deflection is not uniform at the raster edges when compared with the center of the display Scan lines bowed inward are ca 11 ed pincushion distortion Scan lines bowed outward are called barrel distortion A test pattern to measure display alignment Before you check the alignment do the following 1 Turn on the termi...

Page 96: ...th edges should fall between the minimum and maximum display width bands on the reticle see Figure D 2 3 If either edge falls outside the bands adjust the display see the alignment instructions in Chapter 4 Figure D 2 Checking Width and Height Maximum Height Reticle f T t Minimum Height Bezel I I I I I I I Display I i I I I I I I I I I I I Maximum Width I Ie Maximum Width I I D i Minimum I Minimum...

Page 97: ...ent instructions in Chapter 4 Checking Straightness and Pincushioning To check straightness and pincushioning follow these steps 1 Move the reticle along a horizontal edge of the bezel Check the right vertical edge then the left vertical edge against the straightness lines etched on the perimeter of the retic 1 e see Figure D 3 Figure D 3 Checking Straightness Pincushioning Centering and Vertical ...

Page 98: ...ern are inside the etched lines on the left and right sides of the reticle the display is horizontally centered see Figure D 3 3 If the alignment pattern on the display isn t horizontally centered adjust the display see the instructions in Chapter 4 4 Move the reticle against the top bezel edge then the bottom bezel edge If the top and the bottom edges of the alignment pattern are inside the etche...

Page 99: ...g with reticle D 5 rings 4 12 specifications A 2 Central processing unit see CPU Character attributes 6 6 6 7 cell A 1 Circuit isolation jumpers 3 13 Circuit protection 6 10 Cleaning 1 7 Coils 5 6 Communication cable installation 1 6 Communication ports 6 12 Component diagram power supply 4 3 terminal PCB 5 9 Components list capacitors 5 7 coils 5 6 crystals 5 6 diodes 5 6 integrated circuits 5 5 ...

Page 100: ...ement 2 7 specifications A 1 H Height adjustment 4 7 checking with reticle D 4 Horizontal deflection 6 10 Horizontal font density A 1 I I O see Input Output Input Output definition 6 13 devices 1 2 Installation communication cable 1 6 keyboard 1 5 power cord 1 6 terminal 1 4 terminal checklist 3 8 Integrated circuits 5 5 Interfaces asynchronous 1 3 modern 1 3 operator 1 5 primary 1 3 RS 232C 1 3 v...

Page 101: ...on 6 13 Removal and replacement modules 2 2 Removing assemblies in the terminal module 2 5 CRT yoke assembly 2 10 terminal enclosure 2 6 terminal PCB 2 8 the keyboard 2 3 the keyboard cable 2 4 the keyboard PCB 2 5 yoke 2 12 Replacing CRT yoke assembly 2 11 fuse 2 7 terminal enclosure 2 13 terminal PCB 2 10 yoke 2 12 Requirements operating A 1 power A 1 Resistors 5 5 Resolution A 1 Reticle checkin...

Page 102: ...1 microcomputer 6 2 power supply and monitor circuitry 6 9 vertical deflection 6 10 vertical size 6 10 video amplification 6 11 Tools required alignment 4 2 power supply check 3 9 removal or replacement of assemblies 2 3 Touch tilt screen adjustment 1 6 Transformers 5 8 Transistors 5 6 Troubleshooting aids 3 8 flowchart 3 3 quick reference guide 3 3 safety warning 3 2 symptoms 3 3 tools required 3...

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