MAI COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN SERVICE GROUP(S): MINI MFG: ASTEC NACS TYPE(S): 4312 MFG. MODEL(S): ASTEC,DT-4312 CATEGORY: VIDEO TERMINAL DESC: 12" MONOCHROME CRT *** TABLE OF CONTENTS AS OF 01/28/92 *** FIB 00001.General Information.........................................10/14/86 FIB 00002.A/C.power cord loosening....................................10/22/85 FIB 00003.Oddities affecting the keyboard.............................03/06/86 FIB 00004.ON/OFF switch problem causes key function reversal, etc.....03/20/86 FIB 00005.OPTIONAL revision K firmware enhances functionality.........12/17/86 FIB 00006.'Bs' APPEAR ON THE VDT SCREEN WHEN THE SLAVE PRINTER IS PRIN09/18/87 FIB 00007.MM710111.Replacing MM810045 Keyboard Cable may have Problem.06/15/90 FIB 00008.4312 Keyboard Failure - ECN Required........................06/11/90 FIB 00009.Field Repair of VDT Power Supply (MM780130 & MM783010)......10/31/90 FIB 00010.Keyboard Cleaning and Repair................................01/10/92 VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------Table Of Contents Pg01 of 01 FIB 00001 10/14/86 *** General Information *** A new model of VDT, the DT-4312, will be shipped this month. The Sorbus Machine Type assigned to it is 4322. The new device is a redesign of the EVDT, Sorbus type 4309. A new monitor board, MM810060 is used. All monitor adjustment pots are easily accessible along the top edge of the board. A small additional board, a video amplifier, MM810070 is mounted to the neck of the CRT, and another adj. pot, for contrast, is mounted to it. The keyboard, MM810040 is identical to that of the EVDT, with the exception of the relocation of a few of the keys and the color of the keytops. The keyswitches and their springs are identical. Firmware polls the keyboard during a power-on to determine which type is attached, and will decode the key positions accordingly. If no keyboard is attached during power-on, the machine defaults to an EVDT keyboard recognition. The power supply, MM780130, is the same as that used in the EDT, Sorbus type 4312. The Logic board, MM810050, is mounted in the base of the swivel/tilt chassis. Although the components are different, the board is functionally equivalent to the Logic board in the EVDT, MM780010. The board is accessible when the bottom plate of the machine is removed. All assemblies in the new VDT are made offshore by Astec; metric hardware is used (such as the nuts for the RS-232 connectors). From the standpoint of the operator, the functions will be identical to that of the EVDT. *** Sorbus Machine Types and Feature Numbers *** 4322 *** Available Documentation *** MAI Basic Four DT-4312 Video Diplay Terminal Service Manual M8094 *** Available Training *** Included in Basic Four classes at Frazer and Tustin Education Centers. *** Special Tools *** A #1 Phillips screwdriver with at least a 6" long blade required. *** Special Administrative Procedures *** None required. ORIGINATOR: N. Jones VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB001 Pg001 FIB 00002 10/22/85 *** A/C power cord loosening *** A long time problem on CRT devices, especially the units which have chassis that swivel or tilt, has been that of the power cord coming loose from the plug-in receptacle. Unless the customer is alert, this usually results in an unnecessary service call. An ECN has been announced with a simple preventive tie down, using a cable tie and a stick-back mounting pad. This will be implemented in the field only, on an "as-needed" basis, and will not be billed. Use YY006269, Cable Tie Mount, and YY005185, Cable Tie. Stick the mount to a convenient place on the chassis where the cord may be secured about 2-3" from where it plugs into the machine. Cleaning the surface area of the chassis with alcohol where the mount is to be attached will aid its adhesion. Leave just enough slack in the cord to relieve the strain at the connection yet still allow the machine to be unplugged without a struggle. ORIGINATOR: C. GAHAN VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB002 Pg001 FIB 00003 03/06/86 *** Oddities affecting the keyboard *** When the DT-4312 is first powered on, the machine executes a selftest, during which it samples the keyboard to determine which type is attached.If no keyboard is attached the VDT will default to an EVDT TYPE . Backspace and function keys will be reversed. To prevent confusion turn the VDT off when installing or replacing a keyboard. ORIGINATOR: C GAHAN VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB003 Pg001 FIB 00004 03/20/86 *** ON/OFF switch problem causes key function reversal, etc. *** There have been some instances of bad on/off switches. The switch measures ok with an ohmmeter, but will fail, under load. While the symptoms point to a defective switch, it has been found that when the shrink-tubing was cut away from the terminals, the shrink-tubing was the only thing holding the wires to the terminals. There was a quality control problem durig manufacturing and apparently not enough heat as being applied during the soldering of the wires. To repair cut the shrink tubing, remove the wires, slide new tubing over the wires and perform a quality solder job. Then shrink the tubing over the joints. ORIGINATOR: C GAHAN VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB004 Pg001 FIB 00005 12/17/86 *** OPTIONAL revision K firmware enhances functionality *** MAI Basic Four announces an optional enhanced firmware called Revision K for the DT-4312 terminal. This hardware announcement will document the additional functionality of Revision K firmware for the DT-4312 terminal. ****************************************** * * * NOTE * * * * EVDT (4309) KEYBOARDS CAN NO * * LONGER BE USED ON THE DT-4312 * * TERMINAL WITH REVISION K * * FIRMWARE. * * * * * * * ****************************************** TABLE OF CONTENTS 1.0 INTRODUCTION 2.0 FEATURES 2.1 DELETE KEY 2.2 ADDED FUNCTIONALITY TO THE PRINTER PORT 2.3 SCREEN SAVER 2.4 AUTOMATIC MODEM/MUX DISCONNECT CAPABILITY 3.0 INSTALLATION 4.0 GENERAL INFORMATION 1.0 INTRODUCTION MAI Basic Four announces an optional enhanced firmware for the DT-4312 terminal. This hardware announcement will document the functionality of the Revision K firmware on the DT-4312 terminal. 2.0 FEATURES - Character Set Support With the Revision K firmware a separate translator prom is no longer needed because the character set selection is done from the SETUP menu. In addition to currently supported character sets, the DT-4312 supports the MBF Norwegian (7-bit) which requires a new character generation 165046-011, MBF International (8-bit) and MBF Greek (8-bit) which also requires a new character generation 165047-070. 2.1 DELETE KEY The Delete key on the DT-4312 U.S. English keyboard is now programmable. It can be deactivated so that no character is generated when the key is accidently pressed. VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB005 Pg001 2.2 ADDED FUNCTIONALITY TO THE PRINTER PORT In addition to the MBF protocol(ACK/NAK), other protocols can be selected: NONE, XON/XOFF, DTR AND XON-XOFF/DTR. 2.3 SCREEN SAVER If no activity takes place (i.e. a key is depressed or data received from the host) for longer than twelve minutes, the DT-4312 will automatically dim the screen until activity is resumed. This feature enables an inactive terminal to be visually identified and helps prolong screen phosphor life. 2.4 AUTOMATIC MODEM/MUX DISCONNECT CAPABILITY A DT-4312 configured through a modem or multiplexer(MUX) can now signal the modem or MUX to disconnect the terminal port by hitting either of the following key combinations: - Function B (Break; also known as data transmit drop) By depressing the and keys simultaneously, the DT-4312 drops the data transmit line (RS-232 pin 20) for 3.5 seconds, signaling a modem or MUX to disconnect the terminal. - Function D (DTR drop) By depressing the and keys simultaneously, the DT-4312 drops the DTR line (RS-232 pin 20) for 3.5 seconds, signaling a modem or MUX to disconnect the terminal. The modem or Mux must be similarly configured to recognize the particular signal utilized. 3.0 Installation of Revision K firmware 1. Remove cables and keyboard from the terminal 2. Remove screws from the bottom of the terminal 3. Remove bottom plate and connector from the logic board 4. Remove proms at locations A5 and A6 5. Revision K proms Part Numbers: B/4 Part # 165051-017 (Sorbus Part # MM810300) Location A6 B/4 Part # 165051-018 (Sorbus Part # MM810305) Location A5 6. Install Revision K proms at locations A5 and A6 (As labeled on the proms) 7. Install the connector to the logic board and reassemble the terminal. Any translator prom's previously installed, should be removed. 4.0 General Information 1. The use of EVDT (4309) keyboards will be prohibited by revision K of the DT-4312 terminal. 2. If a 4208 or 4212 (Industry standard version) is used, a 907291-001 cable must be used to operate correctly. 3. On 2000/3000 systems with 7.2 operating system or later, an industry standard printer on a DT-4312 can be supported as an ISP (Industry Standard printer). The DT-4312 must be configured as an EDT to get this ISP slave printer support. VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB005 Pg002 4. The 13xx and MPx operating systems prohibits the use of a industry standard slave printer through normal configuration. The slave can be used through a configuration of an SPE or an async device. ORIGINATOR: L. Sanders VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB005 Pg003 FIB 00006 09/18/87 *** 'Bs' APPEAR ON THE VDT SCREEN WHEN THE SLAVE PRINTER IS PRINTING. *** SYMPTOM/TEXT: IT HAS BEEN DISCOVERED THAT REPLACING THE DT-4312 MAIN LOGIC PCB (P/N MM810050) WITH A PCB AT REV. F CAUSES 'Bs' TO APPEAR ON THE VDT SCREEN EVERY.TIME A LINE OF DATA IS PRINTED ON THE SLAVE PRINTER. THE DATA ON THE PRINTER IS NOT AFFECTED. PCBs AT REV. E WORK CORRECTLY. FIX: THE ONLY FIX AT THE MOMENT IS TO MAKE SURE THAT THE MAIN LOGIC PCB IN THE DT-4312.TERMINAL IS AT REV. E. A TAR HAS BEEN SENT TO MAKE B/4 AWARE OF THE PROBLEM. NOTE.- THE SLAVE PRINTER BEING USED WAS A CITIZEN MSP 10/15 AND BOTH DEVICES WERE ON A MODEM. THIS IS NOT BELIEVED TO BE SIGNIFICANT SINCE THIS PROBLEM IS IDENTICAL TO ONE REPORTED ON THE DT-4313 IN WW PROD. SUPP. BULL. # 336 (5/14/87) ORIGINATOR: JOE YANOTCHKO/S.S.SCHWARTZ VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB006 Pg001 FIB 00007 06/15/90 *** MM710111 Replacing MM810045 Keyboard Cable may have Problem *** SYMPTOM: MM710111 Keyboard Cable used to replace MM810045 may not work. PROBLEM DETERMINATION: Some MM710111 Keyboard cables are mis-wired. Cable number 400684-002 (MM710111) is used for the 4312 VDT and the 400684-001 (MM710110) cable is used for the 4313/4314 VDT's. The 400684-002 cable that was sent out, is really a 400684-001 cable. This makes the cable mis-wired. FIX: This is the correct wiring for the 400684-002 cable. The wiring is relative to the backshell of the connector (which is the end that plugs into the keyboard). PIN WIRE COLOR 1 Black 2 Brown 3 Red 4 Orange 5 Yellow 6 Shield Ground (Looks like a thick black wire) ORIGINATOR: J.O'Brien VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB007 Pg001 FIB 00008 06/11/90 *** 4312 Keyboard Failure - ECN Required *** SYMPTOM: High keyboard failure since MM710111 Keyboard Cable (Please read FIB # 7) replaced MM810045 Keyboard Cable. PROBLEM DETERMINATION: Using the old keyboard cable (MM810045) with the 4312 Keyboard would cause no problems. Using the new keyboard cable (MM710111) with . the 4312 Keyboard causes a marginal condition (sometimes it works and sometimes it dosen't). The problem has been determined to be IC Z1 (74LS04) located in the upper left hand corner of the Keyboard PCBA. FIX: It is suggested that a field repair be attempted, due to shortages that may occur. Thoes areas where no one person posses soldering skills, then the keyboard must be ordered. Following is a repair procedure for MM810040 (4312 KYBD W/Enclosuer) and MM810041 (4312 KYBD W/O Enclosuer): 1.) Remove the enclosure, if the keyboard is in one. 2.) Remove the Keyboard PCBA from the enclosure base, by removing the four screws that secure it to the base. 3.) Locate and remove IC Z1 (74LS04) located in upper left hand corner of the Keyboard PCBA. Make certain of the orintation (location of pin # 1)of the IC. TIP: It is easier to remove the IC by first using a small pair of side- cutters and cutting all the IC legs on the component side, this will remove the chips body. Now using a small pair of needle-nose pliers and soldering iron, remove each leg from PCBA. A solder-sipper must also be used to guarantee all holes to be free of solder. 4.) Place and solder a new IC (74LS14) into location Z1. The part number for ordering a 74LS14 from Tustin, is YY003577. 5.) Place a small label on the bottom of the keyboard enclosure, next to the part number label, indicating "LS14 Installed". ORIGINATOR: J.O'Brien VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB008 Pg001 FIB 00009 10/31/90 *** Field Repair of VDT Power Supply (MM780130 & MM783010) *** SYMPTOM: The power supply is outputting no power or low power (ex. + 5 Volts at + 4.75 Volts). PROBLEM DETERMINATION: The above failures may be caused by two components C8 (YY003315) and R26 (YY000877). These components may be ordered from Tustin, using the YY______ numbers. They may also be purchased locally, by using the following information: C8 (YY003315) - Capacitor, 220 UF, 25Volt, Radial Design (Cylinder shape 1/2" long X 5/16" diameter, with both leads coming out of the bottom end), Dielectric Cap. (Polarity must be observed, cap. will indicate negative (-) lead, also on new cap. shorter lead would be negative (-)). R26 (YY000877) - Resistor, 18K (Brown, gray, orange stripes would represent 18K ohm), 1/4 watt, 5 % (Gold stripe indicating 5 % tolerence), Carbon Filament (Resistor body is a 1/4" long). NOTE: Physical size of components is important, due to placement on PCBA. FIX: Replace C8 (Remember, polarity must be observed) and R26. Before replacing the components check the voltages at the supply using the diagram below. NOTE: In addition to the above symptom, if the +12vdc or -12vdc is over 13 volts then this supply is not a good candidate for this FIX. After replacement of the components re-check the voltages as indicated below. + 5.0vdc to + 5.3vdc + 11.9vdc to + 13vdc - 11.9vdc to - 13vdc :------------------------------/ | p14 |--- +5vdc | p13 |--- ground | 4 position pin connector p12 |--- +12vdc | p11 |--- -12vdc | :----| |p9 |--- +5vdc | |p8 |--- ground | Keyed power connector on MM780130 |p7 |--- +12vdc | Used in 4309,4310,4312,4313,4314 |p6 |--- -12vdc | | | | Hard-wired cable on MM781030 |p4 |--- +5vdc | Used in 4309 |p3 |--- ground | |p2 |--- +12vdc | |p1 |--- -12vdc | |----| | ~ ORIGINATOR: J.O'Brien, Mike Burch VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB009 Pg001 FIB 00010 01/10/92 *** Keyboard Cleaning and Repair *** Most of the keyboards sent back to Tustin for repair require only cleaning or minor repair, procedures which can easily be accomplished in the field. 1. Cleaning and simple repair should be attempted on ALL keyboards at the field level. This covers both "switch-type" keyboards, as well as "membrane-type". Keyboards should be repaired on-site, and where this is not possible, brought back to the office or stocking location and cleaned/repaired there. In general, the keyboards can be repaired by disassembling them, blowing-out or brushing off dust and debris, cleaning the PCBA using a foaming-type window cleaner (like aerosol Windex), brightening contact points by rubbing them with an eraser (Pink Pearl), and replacing any worn-out springs or pads Even the newer-style membrane keyboards (such as the DT4315, PSx30, etc.) usually fail because of dust or liquid contamination between the membrane layers preventing a key from making contact. Disassembling these keyboards is equally easy and the membranes can be cleaned by wiping them with a soft cloth dampened with window cleaner. 2. Several hundred keyboard repair kits were distributed throughout the field in the past. Replacement parts for these kits can be ordered through Tustin, part numbers are as follows: Parts for 7270, 4309, and 4312 keyboards. Spring, Spacebar YY013799 Spring, Print Key, Clear, Escape YY012913 Spring, All Others YY012914 Pad (foam/foil for each key) YY006594 Screws (hold PCBA to Keyboard) YY019809 3. After cleaning the keyboard and attempting simple repair, if the keyboard is still not working properly, return it to Tustin using the normal return process. 4. MM810041 (Grey 4312 keyboard) and MM810036 (Putty 4312 keyboard) are alternates for each other and should be treated as such. If you need the opposite color, take the time to switch the keycaps and enclosure rather than ordering another keyboard. (Estimated time of about 10 minutes to switch everything). 5. Effective February 1, 1991, the field will not be able to Code A the 4309 and 4312 keyboards from Tustin (P/N MM783020, MM810036, MM810041). ORIGINATOR: Norm Jones VIDEO TERMINAL-ASTEC-ASTEC,DT-4312------------------FIB010 Pg001