MAI COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN SERVICE GROUP(S): MICRO,MINI,LARGE MFG: MAI SYSTEMS NACS TYPE(S): N119 MFG. MODEL(S): 4315A CATEGORY: VIDEO TERMINAL DESC: MAI DT4315A *** TABLE OF CONTENTS AS OF 07/03/94 *** FIB 00001.Service and Installation Manual.............................09/16/93 FIB 00002.Revision C for DT4315A, List of changes implemented since Re02/11/93 FIB 00003.Standard repair procedures in place for 4315A - parts list..09/17/93 FIB 00004.'SF' and 'SB' mnemonics operate reversed in VT100 emulation 05/18/94 VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------Table Of Contents Pg01 of 01 FIB 00001 MAI COMPANY CONFIDENTIAL 09/16/93 *** Service and Installation Manual *** INDEX CHAPTER 1: Installation CHAPTER 2: Troubleshooting CHAPTER 3: Subassembly Replacement CHAPTER 4: Alignment CHAPTER 5: Parts CHAPTER 1: Installation UNPACKING --------- 1. Check the outside of the shipping carton for damage and evidence of mishandling. If there is any damage to the shipping carton, it must be noted on the carrier's delivery receipt and report to your MAI Systems sales office. 2. Open the carton and carefully remove all items from the carton. Save the carton and all packing material in case you ever have to ship or move the terminal. 3. Make sure all items, as shown in Table 1-1, are present and undamaged. Contact your MAI Systems sales office if any items are missing. TABLE 1-1 --------- DT4315A Package contents ------------------------------------------------------------------------------- Terminal Power Cord Keyboard Manual, User Guide INSTALLATION ------------ Basic Terminal Installation --------------------------- Place the terminal on the desk or table where it will be used. Make sure there is an electrical outlet nearby. The cable(s) to the host computer must also be nearby. 1. Place the keyboard in front of the terminal. With the locking tab on the cable connector facing up, plug the keyboard cable into the keyboard connector at the left side of the terminal. 2. Fold out the legs at the bottom of the keyboard to set the keyboard to the proper angle. 3. Make sure that the power switch at the front of the unit is switched OFF. . Plug the power cord into the back of the terminal. DO NOT connect it to an VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg001 electrical outlet at this time. Connecting Cables ----------------- The DT4315A terminal has three communication ports. One of these ports is reserved for a printer (serial only), while the remaining two ports (Host 1, Host 2) are used for connection to the host computer system. The dual host ports enables MAI's unique Virtual Terminal feature, which in essence, gives you the functionality of two terminals within one. You can connect to either two seperate hosts, or to a single host. Turning on the DT-4315A ----------------------- 1. Make sure the power switch (lower right hand corner of VDT screen) is OFF, then plug the power cord into the wall outlet. Press the power switch to the ON position (a green LED in lower right hand corner will illuminate). 2. Wait several seconds; you will hear two beeps. The screen will light in about 15 seconds. 3. After the terminal has warmed up, the VT1 screen should be displayed and the terminal is ready for use. 4. If any errors are detected during the power up self tests, a message will be displayed to inform you of the condition of the terminal. Adjusting Screen Brightness and Contrast ---------------------------------------- The DT-4315A supports adjustments for both screen brightness and screen contrast. 1. Screen adjustments should be made at least 15 seconds after the terminal has been powered on to allow the CRT screen to warm up. 2. Adjust the brightness (second knob from left, in lower left hand corner of VDT screen) until the light output of the display is as disered. 3. Adjust the contrast (first knob in lower left hand corner of VDT screen) until the characters on the display are clear and crisp and such that half intensity text such as the status line is distinguishable from the normal intensity text. TABLE 1-2 --------- DT-4315A Data Cables and Adapters ------------------------------------------------------------------------------- Description Part Number ------------------------------------------------------------------------------- RJ45 to RJ45, 24 AWG, variable lengths (10 916691-VAR to 400 feet) RJ45 to RJ45, 22 AWG, variable lengths (10 916692-VAR to 900 feet) RJ45 to RJ45, Plenum, 24 AWG, variable 916689-VAR lengths (10 to 400 feet) RJ45 to RJ45, Plenum, 22 AWG, variable 916690-VAR lengths (10 to 900 feet) VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg002 RJ45 to RJ45, 26 AWG, variable lengths for 916688-VAR wall jack connection (3 to 9 feet) DB-9S to RJ45 Adapter 400789 DB-25P to RJ45 Adapter 400788 CHAPTER 2: Troubleshooting TROUBLESHOOTING TABLES ---------------------- The following subsection provides procedures to diagnose problems related to: o Power Supply/VDT Monitor o Logic Board o Keyboard Power Supply/VDT Monitor Problems --------------------- Power related problems can occur as a result of the failure of one or more of these components: o Fuse o Power Switch o Motherboard/Video Neck PCBA Table 2-1 indicates the symptom, lists probable causes, and provides corrective action for power source problems. TABLE 2-1 --------- Power Supply/VDT Monitor Troubleshooting ------------------------------------------------------------------------------- Symptom Probable Cause Remedy ------------------------------------------------------------------------------- No power to terminal 1. Blown AC fuse Replace fuse with one with when power On/Off the proper rating. switch is On, and Green Power On LED 2. Defective Power Perform continuity check on is OFF. Switch the Power Switch. If defective, replace the pcba assembly. 3. Defective Mother- Check power supply voltages, if board/Video Neck bad. Replace Motherboard/Video PCBA Neck PCBA. 4. Defective Green Check J901 plug on Motherboard/ LED Video Neck PCBA. If LED defective, replace. NOTE: To check Power Supply voltages, the Main Logic PCBA must be removed (Chapter 3). The voltages may now be checked at the following points, on the Motherboard/Video Neck PCBA. 1. + 5 Volts U3-Pin 14 2. + 12 Volts U4-Pin 14 3. - 12 Volts U4-Pin 1 ------------------------------------------------------------------------------- No raster on CRT 5. Defective Mother- Replace Motherboard/Video Neck VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg003 (screen remains dark board/Video Neck PCBA. when brightness control PCBA is moved across its entire range) 6. Defective CRT or Replace CRT or Yoke Assemblies. Yoke. ------------------------------------------------------------------------------- No communication with 7. Defective RJ45 Check RJ45 or replace Mother- Host CPU, printer or connector/receptacle board/Video Neck PCBA. keyboard. on Motherboard/Video Neck PCBA 8. Defective 1488's or Replace Motherboard/Video Neck 1489's on Mother- PCBA. board/Video Neck PCBA Main Logic Board Problems ------------------------- Main Logic Board problems can occur as a result of the failure of one of the following components: o Motherboard/Video Neck PCBA o Keyboard o Loose Connection/Cables o Component Failure on Logic Board Assembly Table 2-2 indicates the symptom, lists probable causes and provides corrective action for logic board problems. TABLE 2-2 --------- Main Logic Board Troubleshooting ------------------------------------------------------------------------------- Symptom Probable Cause Remedy ------------------------------------------------------------------------------- Self-test fails 1. Defective Main Replace Main Logic PCBA. Locic PCBA 2. Check for loose If loose, tighten. interconnect cables 3. Defective Mother- Check power supply voltages. board/Video Neck If incorrect, replace Mother- PCBA board/Video Neck PCBA. 4. Check for ROMS not Reset ROMS. seated properly in sockets. ------------------------------------------------------------------------------- Keyboard Problems ----------------- Keyboard problems can occur as a result of the failure of one or more of the following components: o Coiled Keyboard Cable o Keyboard Microprocessor o Keyboard Table 2-3 indicates the symptom, lists probable causes and provides corrective action for keyboard problems. VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg004 TABLE 2-3 --------- Keyboard Troubleshooting ------------------------------------------------------------------------------- Symptom Probable Cause Remedy ------------------------------------------------------------------------------- Incorrect character 1. Faulty coiled Perform continuity check. shown on screen (wrong keyboard cable Replace cable if defective. character or no character) 2. Faulty connector/ Perform continuity check. receptacle Assembly Replace Motherboard/Video Neck PCBA. 3. Loose interconnect If loose, tighten. cables 4. Defective keyboard Replace keyboard. any one of keyboard keys, will not respond 5. Microprocessor Replace keyboard (Keyboard fails selftest) ------------------------------------------------------------------------------- Self Diagnostics ---------------- Each time the terminal is powered on, the terminal automatically performs a Self-Test to check the integrity of critical areas. A single bell tone is generated when all tests are complete. If the terminal detects a low level error, it will sound a series of beep codes, as shown in Table 2-4. High level errors are reported either in one of the diagnostic screens or by a pop-up dialog box. The Keyboard self-tests, consists of all three Keyboard LED's coming on and then going off two times. Beep Codes ---------- Beep codes are read by counting the number of beeps in each group. Some beep codes consist of two groups of beeps, while others consist of three groups. there will be a pause between each group of beeps. For example, if a group of three beeps is followed by a single beep, that is a '3-1' beep code which indicates a CG Address Failure, as shown in Table 2-4. Figure 2-1 shows a few beep in a graphical format. Table 2-4 shows a complete listing of the beep codes generated by the 4315A. FIGURE 2-1 ---------- Beep Format ------------------------------------------------------------------------------- |---- Beep | ___ ___ ___ ___ ______| |___| |___| |_____________________| |_______ Example of '3=1' Beep Code -------------------------- TABLE 2-4 VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg005 --------- DT-4315A Self-Test Beep Codes ------------------------------------------------------------------------------- Beep Code Error Description ------------------------------------------------------------------------------- 1-2 ROM Data Failure 2-1 RAM Address Failure (Addressing problem or bad) 2-2 RAM Data Failure (Data problems or low power supply voltage) 3-1 CG Address Failure 3-2 CG Data Failure 3-1-1 V50 Timer 2 Interrupt Failed ------------------------------------------------------------------------------- Internal Monitor Test --------------------- The internal monitor test is initiated by pressing the F12 key after entering Setup Mode with the CTRL ESC key sequence. To perform the internal monitor test, you will need the terminal, a keyboard and an RS-232 loopback (Figure 2-2, 3 are needed to run test one time). Once the test is started, you press keyboard keys to.advance to each screen in the test. To terminate the test, press the ESC key. When the internal monitor test is initiated, a full diagnostic of the terminal will be performed and the status of each test will display on the screen. The firmware revision will also be displayed on the screen. Once the diagnostic screen is displayed, various test patterns can be selected with the keyboard function keys, as shown in Table 2-5. Refer to CHAPTER 4 for alignment procedures. FIGURE 2-2 ---------- Com Port Loop Back ------------------------------------------------------------------------------- RJ-45 Connector Pins 1----- 2 | 3----- 4 5----- 6 | 7----- 8 ------------------------------------------------------------------------------- TABLE 2-5 --------- Internal Monitor Test Patterns ------------------------------------------------------------------------------- Function Key Pattern Displayed ------------------------------------------------------------------------------- F1 Displays an H pattern for use in alignment and linearity adjustment. F2 Displays an 'm' pattern for use in focus adjustment. F3 Displays an # pattern for use in focus adjustments. VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg006 F4 Displays a dot pattern for use in focus adjustment. This pattern does not work as well in 132 column mode. F5 Displays an attribute test pattern. All the characters in all the usable fonts for the current mode are displayed. In the lower portion of the screen, a line of data in each possible video attribute combination is displayed. F6 Puts up an all white display for use in intensity adjustment F7 Performs all diagnostics and displays current results ------------------------------------------------------------------------------- Most of the patterns described in Table 2-5, can be displayed in any of the video modes supported by your terminal. Table 2-6 describes the video modes that can be accessed by pressing one of the keys on the numeric keypad. TABLE 2-6 --------- Internal Monitor Test Video Modes ------------------------------------------------------------------------------- Keypad Key Video Mode ------------------------------------------------------------------------------- 0 Default alignment video mode (currently 80x30 71 Hz) 1 80x25, 71 Hz 2 132x25, 71 Hz 3 80x30, 71 Hz 4 132x30, 71 Hz 5 132x36, 71 Hz 6 80x26, 71 Hz 7 132x26, 71 Hz 8 80x25, 64 Hz 9 132x25, 64 Hz Num Lock 80x33, 64 Hz / 132x33, 64 Hz * 80x25, 69 Hz (No Overscan) - 132x25, 69 Hz (No Overscan) + 80x30, 69 Hz (No Overscan) Enter 132x30, 69 Hz (No Overscan) ------------------------------------------------------------------------------- In addition, most test patterns can be modified with the CTRL and SHIFT keys. If possible, test patterns are displayed in reverse video in Overscan mode. If either SHIFT key is pressed, the pattern will display in normal video without overscan. If either CTRL key is pressed, the pattern will be displayed in normal video instead of reverse video. VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg007 Burn-in Test ------------ The internal burn-in test is initiated by powering up the terminal with the Burn-in Plug (Figure 2-3) installed. The Burn-in test performs several tests and functions all automatically. About 1/6 of the Burn-in time is spent at high intensity Burn-in, while the rest of the time is spent in low intensity Burn-in. The full internal diagnostic is performed every 5 minutes. The following sequence is performed and repeated. 1. Full internal diagnostics are performed and the status is displayed as in the Monitor test. This display is held for 30 seconds. 2. A ripple test is performed for 4 minutes and 30 seconds with Overscan on and full intensity characters to age the phosphor evenly during its early life on the Burn-in rack. 3. The following sequence is repeated 5 times befor the entire sequence is repeated: a. Full internal diagnostics and display for 30 seconds. b. Ripple test performed for 4 minutes and 30 seconds with no Overscan and dim characters to prevent over-aging of the phosphor. The Burn-in test is terminated by removing the Burn-in plug and power cycling the terminal. FIGURE 2-3 ---------- Burn-in Plug ------------------------------------------------------------------------------- 4 Position Handset Plug Connector Pins 1 2 3----- | 4----- COM PORT PIN ASSIGNMENTS ------------------------ Pin assignments for Host Port 1 and Host Port 2 are defined in Table 2-7. Pin assignments for the Printer Port are defined in Table 2-8. TABLE 2-7 --------- Host Ports Pin Assignments ------------------------------------------------------------------------------- Pin Definition ------------------------------------------------------------------------------- 1 Transmitted Data 2 Signal Ground VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg008 3 Receive Data 4 Signal Ground 5 Data set Ready 6 Signal Ground 7 Data Terminal Ready 8 Signal Ground ------------------------------------------------------------------------------- TABLE 2-8 --------- Printer port Pin Assignment ------------------------------------------------------------------------------- Pin Definition ------------------------------------------------------------------------------- 1 Receive Data 2 Signal Ground 3 Transmitted Data 4 Signal Ground 5 Data Terminal Ready 6 Signal Ground 7 Data Set Ready 8 Signal ground ------------------------------------------------------------------------------- CHAPTER 3: Subassembly Replacement MONITOR ASSEMBLY ---------------- Back Cover ---------- Removal of the Back Cover is the first step for many removal and replacement procedures. Befor you remove the back cover, verify that the terminal is turned off and the terminal is unplugged. Note the location of all screws, washers and other parts that are removed from the terminal and save them; these parts will be needed to reassemble the terminal. The following procedure describes how to remove and replace the Back Cover: Removal To remove the back cover, proceed as follows: 1. Place the terminal tube face down at floor level on a protective surface. Remove the four screws that secure the back cover to the Front Bezil . Replacement To replace the Back Cover, proceed as follows: 1. Reinstall the Back Cover. VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg009 2. Reinstall the four screws that secure the Back Cover to the Front Bezil. Discharge the CRT High-Voltage Circuit -------------------------------------- Befor you attempt to remove the Motherboard/Video Neck PCBA or the CRT and Yoke Assembly, The CRT anode must first be discharged. The procedure to perform this task, and to disconnect its Anode Cap, follows. WARMING DO NOT scratch or strike the CRT or subject it to unusual pressure. The CRT contains a high vacuum and breakage of the tube can result in injury from flying glass. As a safety precautions, wear suitable clothing and eye protection. Even when power is OFF, a hazardously high residual voltage of several thousand volts may be present in the CRT. This static charge can accidently be contacted at the CRT's anode connector or at the flyback transformer. To prevent electric shock, always discharge the CRT connecting its anode contact to ground befor doing any work in the monitor area. Discharging 1. Discharging of the CRT and the high voltage circuit in a CRT High- terminal should be done only after the power cord has been Voltage Circuit disconnected either from the wall power source or from the terminal's power connector. It is recommended you bleed the charge off slowly with a well insulated high voltage discharge probe (internal resistance of about 100K), connected between the CRT ground spring and anode contact. Maintain contact with the anode for several seconds. Two screwdrivers may also be used, but a spark may result (as there is no resistance to absorb the electrical discharge). Again, maintain contact with the anode to ground for several seconds. 2. The CRT will discharge by itself, over a given time (20 minutes) period. Disconnecting Disconnect the anode cap from the CRT anode contact. To Anode Cap avoid damage to the CRT, do not use tools for this procedure. To disconnect the anode cap and cable, proceed as follows: 1. After you discharge the CRT, lift the full circle of the anode cap's plastic flange up from the CRT glass (with time, the plastic may stick to glass). 2. While you hold the flange folded upwards between thumb and index finger, push against one side of the anode cap near it's base until the cap's prong on that side disengages from the CRT's anode contact. 3. Unhook the anode cap's other contact prong to completely disengage the anode cap from the CRT. CRT and Yoke Assembly --------------------- The following instructions detail the steps necessary to remove and replace the CRT and Yoke Assembly: VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg010 Removal 1. Remove the Back Cover as noted in the section "Back Cover" in Chapter 3. 2. BEFORE you remove the CRT/Yoke Assembly, discharge the CRT anode as noted in the section "Discharge CRT High-Voltage Circuit" in Chapter 3. 3. Disconnect the anode cap as noted in the section "Discharge CRT High-Voltage Circuit" in Chapter 3. 4. Pull free the two ground wires from the Video Neck PCBA and the two ground wires going to the Motherboard PCBA. 5. Unplug the Video Neck PCBA 6. Unplug the deflector (J401) connector. 7. Push a 3/16" or 1/4" screwdriver blade down into the center housing (slots in plastic base of VDT) of each of the side struts (metal brackets that hold VDT, to plastic base), then gently lift the strut up and out of slot in base. 8. Tilt the Front Bezel Assembly forward and remove from VDT base. 9. Remove the four screws and washers that secure the CRT to the Front Bezel. Be sure not to damage the rubber washers. 10. To remove the Yoke Assembly from the CRT. Loosen the retaining screw on the Yoke Assembly, cut the plastic epoxy that bonds the CRT to the Yoke Assembly and gently pry the Yoke from the CRT. Replacement To replace the CRT/Yoke Assembly, repeat the removal instructions in reverse order. Front Bazel / Green LED On/Off Light Removal -------------------------------------------- The following procedures detail the steps necessary to remove and replace the Front Bazel and Green LED On/Off Light: Removal 1. Remove the Back Cover as noted in the section "Back Cover" in Chapter 3. 2. BEFORE you remove the Video/Power Supply PCB Assembly, discharge the CRT anode as noted in the section "Discharge CRT High-Voltage Circuit" in Chapter 3. 3. Disconnect the anode cap as noted in this section "Discharge CRT High-Voltage Circuit" in Chapter 3. 4. Remove the CRT/Yoke Assembly as noted in the section "CRT and Yoke Assembly" in Chapter 3. 5. To remove the Green LED Assembly, slide LED from slot in bezel. Replacement To replace the Front Bezel, repeat removal instructions above in reverse order. Logic Board ----------- VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg011 The following instructions detail the steps necessary to remove and replace the Logic Board assembly: Removal 1. Remove J201 Connector from the CRT Board and the ground lug. 2. As you face the rear of the terminal, gently pry the left side of the silver EMI Shield loose with a screwdriver. The shield swings back on a hinge and can be lifted free of the Logic Board. 3. Unlatch the four standoffs that attach the Logic Board to the Video/Power Supply Assembly and lift the Logic Board free of each standoff. Replacement To replace the Logic Board, repeat the above steps. Motherboard/Video Neck PCBA --------------------------- The Motherboard/Video Neck PCB Assembly consists of a single easy to remove board. The procedures below detail the steps necessary to remove and replace the Video/Power Supply PCB Assembly. Removal 1. Remove the Back Cover as noted in the section "Back Cover" in Chapter 3. 2. BEFORE you remove the Motherboard/Video NeckPCBA Assembly, discharge the CRT anode as noted in the section "Discharge CRT High-Voltage Circuit" in Chapter 3. 3. Disconnect the anode cap as noted in the section "Discharge CRT High-Voltage Circuit" in Chapter 3. 4. Remove the CRT/Yoke Assembly as noted in the section "CRT and Yoke Assembly" in Chapter 3. 5. Unscrew the remaining four ground screws from the Mother- board/Video Neck PCBA. This will seperate PCBA from VDT base 6. With removal of all obvious connections and plugs (J401 deflector, Green LED connector, etc.). Carefully tape and label each connection and plug. 7. Pull the Motherboard/Video Neck PCBA straight back to clear the three tabs on the front of the VDT base. While lifting-up on PCBA, be sure that it is free of four tabs (two on each side of VDT base) and the retainer hook located in the center of the Video/Power Supply PCBA. Replacement To replace the Video/Power Supply Assembly, repeat the above removal instructions in reverse order. KEYBOARD -------- The Keyboard Assembly consists of the Keyboard Bottom and Top Covers, the Coiled Cable, and the Keyboard Keycaps. The instructions to disassemble and reassemble the Keyboard Assembly follows. Keyboard -------- VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg012 The following instructions detail the steps necessary to remove and replace the Keyboard: Removal 1. Disconnect the Keyboard Coiled Cable from the terminal. 2. Turn the keyboard upside down and remove the four screws from the bottom cover. 3. Turn the keyboard right side up. Remove the keyboard cover. 4. Remove the four screws (two on each side) from the keyboard metal plate. Lift the Keyboard PCB Assembly away from the botttom cover. Replacement To reassemble the Keyboard, repeat removal instructions in reverse order. Keyboard Keycaps ---------------- The following instructions detail the steps necessary to remove and replace the Keyboard Keycaps: Removal 1. While facing keyboard, gently push on back of keycap to be removed. 2. While pushing on back of keycap with one finger, use other finger to push keycap down in front. 3. After some pressure in both directions, keycap will pop off. Replacement To replace a keyboard keycap, place the new keycap directly over the socket and push the keycap gently into place until the keycap is firmly held in place. CHAPTER 4: Alignment ALIGNMENT --------- This section describes how to align the display of the DT 4315A terminals. Video alignment of the DT 4315A terminal is divided into the following alignment procedures which may be performed in any order. The alignment parameters presented in this section are to be regarded as guidelines only, not as specifications. Alignment Conditions -------------------- Befor you attempt an alignment, the applicable alignment procedure should be read thoroughly. Ensure that the terminal meets these conditions: 1. Warm up. Allow the terminal to stabilize at operating temperature (approx. 20 minutes). 2. Remove the terminal Back Cover, as explained in Chapter 3. 3. Enter Setup Mode and press F12 key to enter alignment procedure. Table 2-5 details the test patterns available for alignment. Table 2-6 details the video modes available for alignment using the numeric keypad keys. 4. Terminate the alignment procedure by pressing ESC. VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg013 Horizontal Display Width (Line Width) ------------------------------------- The horizontal display width may be checked for accuracy and adjusted with a metric ruler, as described below: 1. Enter Setup Mode and press F12. To enter Setup Mode, press the CTRL ESC. Press F1 key to display test pattern(Table 2-5). 2. The distance between the inner edge of the Front Bezel and the outer edge of the first line of characters can be measured with a metric ruler with accurate fine gradations. Near all four corners of the Front Bezel, this distance should be the same and lie within 13.0mm +/- 2mm on the test pattern When you take this measurement, be careful to minimize parallactic distortion (i.e., move the position of the "Head and Eyes" so that each reading is taken straight-on at a 90 degree angle to the screen). 3. If adjustment is required, rotate L501 (Horizontal Display Width) on the Motherboard/Video Neck PCBA, with a non-metallic 7/64 inch hex head Alignment Tool until the display has the proper width. Clockwise rotation increases the display width and counterclockwise rotation reduces display width. 4. Verify that the horizonal display width is correct. If needed, readjust. Vertical Display Height ----------------------- The vertical display height may be checked for accuracy and adjust with a metric ruler, as described below: 1. Enter Setup Mode and press F12 key. To enter Setup Mode, press the CTRL ESC. Press F1 key to display test pattern. 2. The distance between the inner edge of the Front Bezel and the outer edge of the first line of characters can be measured with a metric ruler with accurate fine gradations. Near all two upper corners of the Front Bezel, this distance should be the same and lie within 10.0mm on the test pattern. When you take this measurement, be careful to minimize parallactic distortion (i.e., move the position of the "head and eyes" so that each reading is taken straight-on at a 90 degree angle to the screen). 3. If adjustment is required, rotate R417 (Vertical Size) and R418 (Vertical Linearity) on the Video PCB with a small non-metallic standard flat blade screwdriver until the display is the proper height. Clockwise rotation increases the display height and counterclockwise rotation reduces display height. R417 controls overall line height; R418 controls one row character height. 4. Verify that the vertical display height is still correct. If needed, readjust. Brightness ---------- To adjust the display brightness, proceed as follows: 1. Enter Setup Mode and press F12 key. To enter Setup Mode, press the CTRL ESC. Press F6 key to display test pattern. 2. Rotate the external brightness control on the Front Bezel fully up. 3. Locate point R527 (Sub Bright) on the Motherboard/Video Neck PCB and with a small, non-metallic flat blade screwdriver adjust until the background raster VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg014 is just visible. 4. Locate the test point G1 on the Motherboard/Video Neck PCB and measure the DC voltage between G1 and ground. Record the voltage observed. 5. Adjust R527 (Sub Bright) to increase the negative voltage observed between G1 and ground by approximately 11 +3,-1 Volts DC. Contrast -------- To adjust the contrast (sharpeness) of screen characters, proceed as follows: 1. Enter Setup Mode and press F12 key. To enter Setup Mode, press the CTRL ESC. Press F6 key to display test pattern. 2. Rotate the external contrast control on the Front Bezel fully up. 3. Locate point R272 (Sub Contrast) on the Motherboard/Video Neck PCB and with a small, non-metallic flat blade screwdriver adjust until the background raster is visible and the characters are sharpest. Focus ----- To adjust the display focus, proceed as follows: 1. Enter Setup Mode and press F12 key. To enter Setup Mode, press the CTRL ESC. Press F2, F3 and F4 keys to display test patterns used to adjust focus. 2. Locate R529 on the Motherboard/Video Neck PCB and with a small non-metallic flat blade screwdriver adjust R529 for optimum focus at the center of the display. Optimum focus occurs when the individual dots that form a character are well-defined and clear. Note the setting of R529. 3. Observe the corners of the display and change the setting of R529 for optimum focus there. Note the setting of R529. 4. Carefully adjust R529 for an optimum focus compromise setting between the center and corners of the screen areas. Horizontal Hold --------------- The horizontal hold can be adjusted as follows: 1. Enter Setup Mode and press F12 key. To enter Setup Mode, press the CTRL ESC. Press F1 key to display test pattern. 2. Locate R514 on the Motherboard/Video Neck PCB and with a small, non- metallic flat blade screwdriver adjust R514 to steady the display from horizontal distortion or flicker. Horizontal Phase ---------------- The horizonal phase (position) of the display affects the left to right position of the characters on the screen. It can be adjusted as follows: 1. Enter Setup Mode and press F12 key. To enter Setup Mode, press the CTRL ESC. Press F1 key to display test pattern. 2. Locate R515 on the Motherboard/Video Neck PCB and with a small, non- metallic flat blade screwdriver adjust R515 until the left to right placement on the screen is centered in the Front Bezel and has no wraparound. VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg015 CHAPTER 5: Parts Refer to FIB 3 for parts list. NOTE: Engineering Documentation will refer to the DT4315A Video Terminal, as the DT 4317 Video Terminal. They are one in the same. ORIGINATOR: J.O'Brien MODIFIED by: Norm Jones VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB001 Pg016 FIB 00002 MAI COMPANY CONFIDENTIAL 02/11/93 *** Revision C for DT4315A, List of changes implemented since Rev B *** This FIB outlines the differences between the Rev B firmware and the Rev C firmware for the Model 4315A: 1) Fixed Print Bypass Panic Errors. 2) Change French and Belgian Keyboard drivers to be more DT4315 like. Caps lock now works similar to other language keyboards. Shift Lock is still compatible with the PC. This allows the user to select between DT4315 or PC lock operation by selecting between Shift Lock and Caps Lock in the keyboard setup mode. 3) The 80x25 and 132x25 screen formats have been added to the Current Virtual Terminal setup menu. The sequences for accessing these modes from the host are: For 80x25---> Xs7F For 132x25---> Xs7G These sequence will work on revision B also. 4) Line edit mode has been fixed. When this mode was accessed in revision B, the terminal would get a packet panic. This mode is only used from MAI Office word processor. 5) The horizomtal timing has been changed slightly to allow easier manufacturability. 6) + now toggles the current state on Enter mode. This allows easy debugging of applications by programmers. NOTE: This prom change available with Market Code KE191AA ORIGINATOR: John O'Brien VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB002 Pg001 FIB 00003 MAI COMPANY CONFIDENTIAL 09/17/93 *** Standard repair procedures in place for 4315A - parts list *** The whole unit replacement policy is no longer valid, use standard repair Procedures. --------------------------------------------------------- MAI P/N ICN VNDR P/N DESCRIPTION --------------------------------------------------------- 400922-001 MM716000 Keyboard DT4315A English 400922-506 MM716005 304259-01 Keyboard cable 400923-001 MM716999 DT4315A Terminal non-ESF (U.S.) 400923-002 MM716998 DT4315A Terminal MPR-II (EUROPEAN) 400923-501 MM716010 304139-01 Power Supply/Monitor PCBA/Neck PCBA Assy. 400923-504 MM716015 303730-01 Yoke with magnets and wire harness 400923-505 MM716020 303112-04 CRT Tube only, White, Non-ESF (U.S.) 400923-506 MM716025 303112-07 CRT Tube only, White, ESF (EUROPEAN) 400923-508 MM716030 304132-01 Main Logic Module PCBA 400923-509 MM716040 Swivel base, tilt 4315A 400923-510 MM716045 Front bezel 4315A 400923-600 MM716035 800580-01 Flyback Transformer 400923-601 YY030083 302198-01T IC TDA1170N 400923-602 YY030084 800592-01 V.R 10K 0.1W 20% (R515, R272) 400923-603 YY030085 800592-07 V.R 50K 0.2W 20% (R418) 400923-604 YY030086 800526-01 V.R. 5K 0.1W 20% (R514) 400923-605 YY030087 301686-01 V.R 500K 0.5W 20% (R527) 400923-606 YY030088 800236-01 Transformer FOCUS EE-16 (T502) 400923-607 YY030089 303707-01 Coil Common Chrome 200mH 1A 250V (T801) 400923-608 YY030090 800590-01 Transformer Converter (T802) 400923-609 YY030091 800238-01 Coil Width, Adjustable 3-24UH (L501) 400923-610 YY030092 800525-01 Coil Linearity 14.5UH 20% (L502) 400923-611 YY030093 800562-01 V.R 10K 0.2W 20% (R273) 400923-612 YY030094 800563-01 V.R 50K 0.2W 20% (R528) 400923-613 YY030095 800582-01 Switch, Main AC power, PCBA Type, 2P2T (SW801) 400923-614 YY030096 800273-01 Transistor, 2SK794 (Q801) ORIGINATOR: Norm Jones VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB003 Pg001 FIB 00004 MAI COMPANY CONFIDENTIAL 05/18/94 *** 'SF' and 'SB' mnemonics operate reversed in VT100 emulation in OB *** Subject : DT 4315 & 4315A using VT100 emulation with OpenBASIC Type : Problem Symptom : DT 4315 & 4315A using VT100 emulation with OpenBASIC, the mmnemonic 'SB' will display the information in Foreground and using mmnemonic 'SF' will display information in Background. Solution: You must modify the terminal setup, In Terminal Management select Vitual Terminal Options, Select Configure Selected VT, select VT100 parameters, select option Bold attribute and change the option from Half Intensity to Compatible and save the change. Note : The option for Bold Attributes are not found on DT 4315 & 4315A terminals that are on REV A. You must be on REV C or above to set this option. ORIGINATOR: Joe Melendez VIDEO TERMINAL-MAI SYSTEMS-4315A--------------------FIB004 Pg001