MAI COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN SERVICE GROUP(S): MICRO,MINI MFG: BASIC FOUR NACS TYPE(S): 4309,9309 MFG. MODEL(S): 4309,EVDT CATEGORY: VIDEO TERMINAL DESC: 12" CRT - EVDT *** TABLE OF CONTENTS AS OF 01/28/92 *** FIB 00001.General Information.........................................10/14/86 FIB 00002.'Garbage' on screen may be because Alternate Character set s07/26/83 FIB 00003.'Extension Port' option is not activated for a Slave Printer10/11/83 FIB 00004.Correction and additions to part numbers....................03/07/88 FIB 00005.Operator.& Service manuals incorrect concerning Security Mod01/23/84 FIB 00006.Parts compatibility/interchangeability information..........02/15/84 FIB 00007.Remove main Logic PCBA prior to discharging the High voltage07/24/84 FIB 00008.13XX EVDT/Printer Error 0 on BOSS releases prior to 4.5A....07/31/84 FIB 00009.Service aid information.....................................08/01/84 FIB 00010.Don't disconnect keyboard cable with power on...............09/07/84 FIB 00011.New Monitor board available to fix dot jitter problem.......10/15/84 FIB 00012.Slanted lines on screen - especially noticable on reverse vi11/26/84 FIB 00013.PROM changes required to slave Diablo 630 & to run on Boss/V02/08/85 FIB 00014.Backup battery service information..........................06/18/85 FIB 00015.Service information and part numbers for field repair of key07/22/85 FIB 00016.ECN information on slave printing with a one-to-one cable...08/14/85 FIB 00017.Field replacement of communication ICs......................08/30/85 FIB 00018.A/C power cord loosening....................................10/22/85 FIB 00019.Information on Power Supplies with soldered or detachable ca11/07/85 FIB 00020.New revision of firmware and Character Generator PROMs avail11/08/85 FIB 00021.ECN available to improve static immunity at the keyboard....12/18/85 FIB 00022.NEW STYLE MONITOR BOARD_....................................08/25/87 FIB 00023.Monitor Boards & Yoke Update................................09/08/87 FIB 00024.SWITCH 6L ON MAIN LOGIC.....................................05/03/88 FIB 00025.Rev. G firmware required for MAI OFFICE.....................08/16/88 FIB 00026.Part Number for P/S Standoffs...............................02/23/89 FIB 00027.Keyboard Enclosures no Longer Refurbished, Use Customer's...09/08/89 FIB 00028.Field Repair of VDT Power Supply (MM780130 & MM783010)......10/31/90 FIB 00029.Keyboard Cleaning and Repair................................01/10/92 FIB 00030.Monitor Bd MM780030 no Longer Available.....................04/24/91 VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------Table Of Contents Pg01 of 01 FIB 00001 10/14/86 *** General Information *** The EVDT has the following features: 12" Monochrome CRT; Programable function keys; Extension Port; Displayable Clock Separate Keyboard; 18-key Numeric Keypad; Keyboard Selectable Set-up *** NACS MACHINE TYPES AND FEATURE NUMBERS *** 4309,9309 *** AVAILABLE DOCUMENTATION *** Model 4309 Ergonomic VDT Service Manual - MBF 8070 - S-HDBK-B32 Ergonomic VDT Operators Guide - S-HDBK-B38 *** AVAILABLE TRAINING *** Both Education Centers with Basic Four classes *** SPECIAL TOOLS *** None *** SPECIAL ADMINISTRATIVE PROCEEDURES *** None ORIGINATOR: P. BADER VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB001 Pg001 FIB 00002 07/26/83 *** 'Garbage' on screen may be because Alternate Character set selected *** There have been several EVDT PCBAs replaced erroneously for what appeared to be "garbage" characters on the display. The strange display really resulted from an accidental selection of the alternate-character-set which is used for graphics. Some examples of the characters seen are as follow: for what should display as an upper case "A", will display as a lower case "a" with an accent mark; numbers 1, 2 and 3 will display as lower case "u"s with each having a different accent mark; a Carriage Return entered will display as a solid block one dot column narrower than a cursor; the BOSS prompt ">" will display as two . dots in a horizontal line. If attached to a system, the characters sent to the system are correct as keyed, so the system will behave normally if you ignore the display. Alternate-character mode is invoked by an Escape character followed by the ASCII "less-than" character "<" from either the Host system (or the terminal if in Block mode). It is reset by either an Escape character followed by the ASCII "greater-than" character ">", or by a "four-key" reset (CTRL, SHIFT, FUNCTION and CLEAR) which resets all parameters to the defaults. It is NOT reset by Power-off or even by PCBA removal. The PCBAs returned erroneously were still in alternate-character-set mode when tested at the Repair Center. Please be alert for this condition. Reset it using either of the procedures mentioned above. If it appears that it is becoming invoked other than by deliberate (possibly accidental) action of the operator, advise either the TIC staff or John VanderHeyden through your normal technical support channels. ORIGINATOR: J. VANDERHEYDEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB002 Pg001 FIB 00003 10/11/83 *** 'Extension Port' option is not activated for a Slave Printer *** There is some confusion regarding the use of the 'EXTENSION PORT' feature available on the EVDT Setup Menu. THIS FEATURE SHOULD NOT BE SET TO '1' IF A SLAVE PRINTER IS ATTACHED TO THE EVDT Its activation defeats the terminal Slave Printer protocol support, and if mistakenly activated, will result in the inability to access the slave from the system. It may also cause various display abberations due to its use of X-OFF/X-ON protocol to slow down the Main I/O Baud rate to that of the Printer (Extension) port when in use. The 'EXTENSION PORT' Feature of the EVDT was present on the OEM terminal from which it evolved. As yet, there are no BFISD applications that utilize it. ORIGINATOR: J. VANDERHEYDEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB003 Pg001 FIB 00004 03/07/88 *** Correction and additions to part numbers *** (ICNs unchanged - Vendor numbers updated - new ICNs indicated *) BFISD MODEL NACS TYPE 4309 4309 GENERAL INFORMATION: The Ergonomic Video Display Terminal (EVDT) is a microprocessor-controlled device with slave-printer capability, and functionality generally similar to the BFISD 7270. It has expanded video attributes, a tilt/rotate pedestal (optional), and a separate low-profile keyboard attached with a telephone- style cable. SPECIFIC INFORMATION: PARTS Part number prefix is MM78xxxx. Available parts are as shown below. NACS ICN Vendor P/N Description MM780010 903373-001 PCBA, MAIN LOGIC EVDT MM783010 400449-001 PCBA, POWER SUPPLY MM783020 400433-001 KEYBOARD ASM English w/o cable MM783030 02-2003-00 CRT/YOKE ASM (80 col only) MM780020 030128-001 PCBA, MONITOR (80 col only) *MM788100 455001-001 YOKE, MONITOR (80 col only) *MM780030 030057-001 PCBA, MONITOR (80/132 col) *MM780120 450001-001 YOKE, MONITOR (80/132 col) *MM783060 201002-001/002 CRT, 12 inch green *MM788060 N/A CABLE, KEYBOARD TO LOGIC *MM788030 330006-001 SWITCH, ON/OFF *MM788080 181023-001 CONNECTOR/LINE FILTER,AC INPUT *MM786010 02-2002-00 CHASSIS *MM786020 907354-001 BRACKET, POWER SUPPLY *MM786030 400416 KEYBOARD CABINET ASM *MM788010 907365-001 CABLE ASM, MONITOR TO LOGIC *MM160000 212002 MONITOR FUSE 2A 250V 5X20MM ORIGINATOR: J. VANDERHEYDEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB004 Pg001 FIB 00005 01/23/84 *** Operator & Service manuals incorrect concerning Security Mode setup *** There is an error in both the Operator's and Service Manuals regarding the Default (recommended) mode for the SECURITY function in the EVDT Setup Menu. The default mode (in effect after a 4-key reset) is SECURITY = 0. All EVDTs are shipped with this mode in effect, however it may be changed by the operator and will remain set to "1" even after power-cycling unless changed by the Setup Menu or the full 4-key reset. Certain Escape functions used by BFISD software will fail to perform correctly if the SECURITY mode is set to "1". One example is the !PHOTO used by 810/8000 systems to print the screen of a display terminal. !PHOTO will print a blank screen with an outline for an EVDT with SECURITY set to "1". Please ensure that this error does not cause erroneous service calls or user confusion. ORIGINATOR: J. VANDERHEYDEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB005 Pg001 FIB 00006 02/15/84 *** Parts compatibility/interchangeability information *** The following parts are interchangeable in all type 4309 EVDTS: - CRTS - MM783060, Falco P/N 02-2003-00 All Cathode Ray Tubes are identical, only the yoke is different. - POWER SUPPLIES - MM783010, BFISD P/N 907447-001, Falco P/N 02-2006-02, Astec P/N AC8151 All Power Supplies are equivalent. Some will have cables pluggable at both ends. The cable should be considered part of that supply. - LOGIC PCBAS - MM780010, BFISD P/N 903373-001, Falco P/N 02-1010-03 Identical except for firmware and labels. All hardware ECNs to date have been required to allow the use of ICs from various manufacturers. (None affected functionality.) Falco produced Revision C firmware and BFISD produced Revision D. They are functionally identical, however Revision D supports the ISO character set (MAII). - KEYBOARDS - MM783020, BFISD P/N 400433-001, Falco P/N 02-6000-00 All are identical. The only ECN to date changed the value of R9 from 1K to 270 OHM in order to compensate for the increased inductance of the Toroids used on BFISD- built Main Logic PCBAs to filter the keyboard scan signal. Sorbus will perform this ECN on all repaired Keyboards. This ECN makes the Keyboard Revision C - it is only required on those which fail to function on attached EVDTs. In emergencies, Keyboards which fail on BFISD-built EVDTs will often work satisfactorily on a Falco unit. THE FOLLOWING PARTS ARE NOT INTERCHANGEABLE: - MONITOR PCBAS - There are two types. THEY ARE NOT INTERCHANGEABLE! The original type is called the "80-column" monitor PCBA, MM780020, Falco P/N 030128-001. It can be recognized by the two different sizes of potentio- meters used on it. It can be used with the "80-column" deflection yoke (MM781000) only. This Yoke is also part of CRT/Yoke assembly (MM783030), which together with the MM780020 PCBA made up the original monitor spares. The 80-column Yoke has no components soldered to its terminals - only the wiring to the PCBA connectors. The "80/132-column" monitor PCBA MM780030, Falco P/N 030057-001, is now standard equipment on the EVDT, though the EVDT will not be offered with the 132- column feature. This PCBA can be recognized by its having all the same size potentiometers. It should only be used with the "80/132-column" deflection yoke (MM780120), which has a Diode and a Resistor in series soldered to its wiring terminals. - DEFLECTION YOKES - There are two types. THEY ARE NOT INTERCHANGEABLE ! "80-column" MM788100, Falco P/N 455001-001, with no components mounted on solder terminals. Use with Monitor PCBA, MM780020. "80/132-column" MM780120, Falco P/N 450001-001, with Diode and Resistor mounted on it. Use with Monitor PCBA, MM780030. Note that the 80/132-column PCBA/Yoke set is generally capable of better resolution than the original types and is sometimes referred to as the "High Resolution" monitor. The CRTs themselves are the same on both types of VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB006 Pg001 monitors. If the 80 Column Monitor PCBA or Yoke cannot be obtained, the EVDT can be converted to the High Resolution Monitor by replacing the 80/132 Column Monitor PCBA and Yoke. ORIGINATOR: J. VAN OORDT VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB006 Pg002 FIB 00007 07/24/84 *** Remove main Logic PCBA prior to discharging the High voltage *** When replacing the monitor PCBA or CRT, always remove the main logic PCBA before.discharging the CRT anode. If the anode is discharged with the main logic PCBA connected, damage to the main logic board will most likely result. ORIGINATOR: J. VANDERHAYDEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB007 Pg001 FIB 00008 07/31/84 *** 13XX EVDT/Printer Error 0 on BOSS releases prior to 4.5A *** EVDT terminal keyboards with upper case six (6) indicate either a cent sign or a grave accent mark. The hex code for this keystroke is $E0$. Due to printer drivers in software releases prior to BOSS Level 4.5, this code will cause an ERROR 0 during printing. Software releases 4.5A and above correct this problem. ORIGINATOR: J. RIPPL VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB008 Pg001 FIB 00009 08/01/84 *** Service aid information *** The following information should be kept in mind when investigating reported failures on the EVDT: - There are two types of EVDT's in the field at this time: those built by the Original Equipment Manufacturer (OEM) and those built by BFISD. Physically they are exactly alike except for ID labels. Units built by the OEM contain Revision C firmware (displayed on the bottom of the SETUP Screen), while BFISD -built units contain Revision D or above firmware. There are four (4) PROMS in the Rev. C set versus only three (3) in Rev. D or above. - Revision E firmware is now being incorporated by BFISD on all new terminals and on all spare parts by Sorbus West (The old PROMS should be returned for erasure and re-programming). The new firmware incorporates some "bug" fixes and revised functionality in certain areas as follows: o BFISD Model 4206 WP Printer is NOT supported (Sorbus Machine Type 4250) Note: Rev. C or D firmware may be used or call Customer Satisfaction if unavailable from a customer's existing machine. o Business Graphics Mode is RESET on Power-up Note: Rev. C requires a 'Four-Key RESET' function to clear. This has been responsible for many unnecessarily replaced PCBA's since the graphics random display gives the symptom of a hardware failure. o Business Graphics execution commands have been changed (requires applications software changes) o Includes ISO language (currently only used in Europe) o Upper case '6' displays a grave accent mark (Rev. C displays cent symbol) o SETUP MENU layout and options have been changed (Lines three and five) - Many software applications including OMS make use of the Function Keys (F0 thru F14 and the SHIFTed functions thru F28). These are loaded through the serial I/O port by the Host Computer. The low profile of the EVDT keyboard is radically different from the keyboards it replaces which could cause keying errors. If a Function Key is struck erroneously, the results could be anything from a sudden log-off to a file with erroneous data records entered. Be alert for some strange new symptoms and try to observe an operation in process before suspecting hardware failures. - There are two styles of Monitors installed. The current type is a high- resolution design that could function as a 12-inch/132-column display. The CRTs themselves are identical but the Yokes and Monitor PCBAs cannot be used interchangeably. The present intentions are to stock both types of Yokes and Monitor PCBAs in the field but only one part number CRT. When it becomes necessary to substitute because of an out-of-stock condition, it will be necessary to replace the Yoke and PCBA together. If it is necessary to "pincushion" the replacement Yoke, the magnets may be borrowed from the old Yoke if they have not yet been supplied for local stock. The magnets are plugged over plastic projections molded into the Yoke form, and rotated for optimum linearity of the display. - If you use the SETUP MENU Screen for adjustment purposes, remember that the keyboard FUNC/BRITE and DIM operations ARE NOT OPERATIONAL WHILE THE SETUP VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB009 Pg001 MENU IS ON THE SCREEN. (SETUP is also a FUNC operation, and supersedes other functions.) ORIGINATOR: J. RIPPL VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB009 Pg002 FIB 00010 09/07/84 *** Don't disconnect keyboard cable with power on *** When disconnecting the keyboard modular plug, make certain that the power has been turned off. Damage to IC's may occur by disconnecting them with power on. ORIGINATOR: J. BUSCAGLIA VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB010 Pg001 FIB 00011 10/15/84 *** New Monitor board available to fix dot jitter problem *** Monitor boards for the 80/132 column (high resolution) EVDT's with the new flyback transformers are now available to replace customer boards waiting for the resolution of the dot jitter problem. Make sure that the replacement board has part number 470006-002 stamped on the flyback transformer. Board part number is MM780030. When returning defective boards, please note on the DMT tag that dot jitter is the reason for replacement. This way we make sure that the intermittent transformers are replaced. ORIGINATOR: J. BUSCAGLIA VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB011 Pg001 FIB 00012 11/26/84 *** Slanted lines on screen - especially noticable on reverse video *** This symptom can be caused by "raster ringing" caused by the CRT cathode cables being routed in close proximity to the high voltage fly-back transformer. Re-route the CRT cathode cable harness away from the fly-back transformer. ORIGINATOR: J. VANDERHAYDEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB012 Pg001 FIB 00013 02/08/85 *** PROM changes required to slave Diablo 630 & to run on Boss/VS 8.4B *** Revision E or higher firmware is required to support the 8.4B Operating System and Revision F is required to support the Diablo 630 Printer as slave on the EVDT. Revision F firmware is now available from Sorbus Materials West. The firmware should be replaced only when necessary at the next service call. Use Service Code.11 (not billable) on the IR and order the parts on Code B. All spares will be updated as they go through the repair cycle. Revision F firmware can be obtained by ordering the following parts: NACS ICN VENDOR P/N DESCRIPTION YY014918 165031-088 IC PROM, LOC 4E YY014919 165031-089 IC PROM, LOC 3E YY014920 165031-090 IC PROM, LOC 2E ORIGINATOR: J. BUSCAGLIA VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB013 Pg001 FIB 00014 06/18/85 *** Backup battery service information *** Failure of the backup battery will cause the terminal to return to its default configuration values after the machine has been powered off. This is an inconvenience and annoying to the terminal operator. At present, as the battery is soldered to the Logic Board, this requires that the board be replaced. The battery receives its charging voltage from the +5v. supply while the terminal is powered up. When the machine is off, the battery supplies retaining voltage to only one RAM chip (6E), therefore drain on the battery is minimal. Long durations of drain will cause a fail condition; the life of the battery is dependent.on its age and the number of times the discharge/charge cycle has been initiated. Life also decreases as operating temperature increases. A fully charged good battery should be capable of maintaining its charge over a 3-day weekend, but may not last for a 2-week vacation. Once a charge has been depleted, the machine must be left on long enough to complete a charge cycle; otherwise battery reliability may not be dependable. Manufacturers specifications state the full charge cycle is about 14-16 hours and that the battery should withstand 500 full discharge/charge cycles without a decline in its capacity. A fully charged, good battery will supply 2.6V. The RAM chip will retain data to a minimum of 2.0V. If battery will not retain a charge to meet minimum requirements of the IC, it must be considered defective and the board replaced. ORIGINATOR: C. GAHAN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB014 Pg001 FIB 00015 07/22/85 *** Service information and part numbers for field repair of keyboards *** A large percentage of keyboards being returned for repair could have been repaired in the field. Of those, the main problems were dirt, "lunch" and worn and/or binding keys. ("Lunch" is defined as residue from yesterday's tuna sandwich, coffee spills, staples, etc.) To clean the keyboard, remove it from its cover asm. About 20 small Phillips screws hold the contact board to the keyswitch retaining plate. Remove and lift the contact bd. Use alcohol to dissolve surface dirt, buff contact surface with a soft eraser, then shine with alcohol to remove residue. Clean bottom of keyswitches of any accumulation and the plungers of binding keys; check foam- pads for deterioration. Replace as necessary. The Return key has been voted as "the key most likely to bind." Particular attention should be given to the right side of the right keyswitch. (There should be two keyswitches per Return key, both with springs. The keyswitch on the left side of the key MUST NOT have a capacitor foil plate on the bottom of the foam-pad.) The keyswitches may be rotated, swapped or replaced at your discretion. It has been stated that for best operation the keyswitches under the Return key should be placed so that the open ends of the horseshoe-shaped spring retaining rim on the top of the keys are facing each other - I pass that along without comment. Check the cable connector for rigidity and use GE RTV silicon or bathtub caulk if it's loose. If flexing has been occurring, check the solder joints. During re-assembly, the temptation to short-change the contact bd. of its screws will exist, but please use at least 90% of them, as they prevent the board from warping away from the keys. Some concern has been expressed that the customer may be repulsed by the unsightly innards of a grubby keyboard, but after all, it is their dirt and "lunch", coming from their environment. This may encourage the customers to use dust covers and to be more careful. Part numbers: Springs YY012914 * Keyswitches YY013798 * ICN was incorrect on previous Mini Alert #379 The keyboard logic theory described in the 4309 Service Manual BFISD 8070PA is incorrect. There are no magnetic cores and no auto transformer action as mentioned in Sect. 3.5 on page 3-8. The keys use a capacitive charge coupling instead. A non-conductive, metallic-looking capacitor plate is adhered to the bottom of a foam-pad within the keyswitch. This also invalidates several statements made in the Troubleshooting Guide, Table 4-1, pgs. 4-4 and 4-5. A brief explanation of the logic follows: Key operation is column and row decoded, and a capacitor coupled charge eventually produces a "two-shot" output at Z5 (74LS74). Z8 (74LS164) controls column and row decoding, with column counting by Z9 or Z10 (74LS138), and row counting with Z7 (CMOS 4051). Z7 outputs when capacitive coupled row/column matrix is activated by the keyswitch depressed, enabling Z6 (Proprietary CMOS) to convert 2 one-shot pulses to a TTL level. (Normal scoping of Z6 and Z7 for pulses is not possible.) Circuit clock is derived from Z3 (74LS123), initiated by the serial bit character code input from the Logic Bd. through Z1 (74LS04). Timing is accomplished by Z3 and Z4 (74LS93) and Z2 (74LS00). Z1 is also used VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB015 Pg001 in the one-shot detect, the column counter select circuit, and the timing circuits. Circuit problems usually require keyboard replacement, and the use of the accompanying matrix diagram may help pin down the failure of an IC in a vertical column or a horizontal row of keys. ORIGINATOR: C. GAHAN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB015 Pg002 FIB 00016 08/14/85 *** ECN information on slave printing with a one-to-one cable *** ECNs are being implemented to allow use of a one-to-one cable when slave printing with hardware flow control. This change is normally done in the Repair Center, and should only be done to field machines on an as-needed basis. The change consists of adding "DATA SET READY", Pin 6 (Printer port conn.) in parallel with "DATA CARRIER DETECT", Pin 8 on the respective Logic Board. 903462-XXX 4312 EDT Jumper J4-6 to J4-8. LOGIC PCBA Indicate change on applicable drawings, MM780150 labeling J4-6 'BDSR+'. 903373-XXX 4309 EVDT Jumper J6-6 to J6-8. LOGIC PCBA Indicate change on applicable drawings, MM780010 labeling J6-6 'PDSR'. ORIGINATOR: J. VAN OORDT VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB016 Pg001 FIB 00017 08/30/85 *** Field replacement of communication ICs *** Problem: All controller boards with 1488 and 1489 Chips frequently fails during an electrical storm. Solution: These boards can be repaired in the field by replacing the Chips that are on the IC sockets. Order the Chips and keep them in your tool bags and replace them when one of the channels are not functioning. The IC Chip inventory control numbers are as follows: 1. OR999398 IC, 1488L 2. YY003599 IC, 1489 The following are the boards that have the 1488/1489 on IC sockets: 1. MM081018 901706 PCBA, 1 Channel Controller Board 13XX 2. MM081019 901708 PCBA, 4 Channel Controller Board 13XX 3. MM081020 901420 PCBA, 8 Channel Controller Board 13XX 4. MM361000 903271-001 PCBA, Tritel Logic Board 5. MM362070 903300-003 PCBA, Whisper Logic Board 6. MM531011 903441-002 PCBA, CMB 2000 7. MM531040 903390-001 PCBA, 4-Way Controller 2000 8. MM720010 901810 PCBA, 7230 Logic Board 7230 9. MM730010 901990-001 PCBA, 7250 Logic Board 7250 10. MM741020 903260-001 PCBA, 7270 Logic Board 7270 11. MM780010 903373-001 PCBA, EVDT Logic Board EVDT 12. MM780150 903462-001 PCBA, EDT Logic Board EDT 13. MM821020 903242-001 PCBA, 8 Channel Controller Board 13XX 14. MM831061 903149-002 PCBA, 1345 Accessory Board 13XX 15. MM871010 903179-003 PCBA, CPM/VDM Board MDT ORIGINATOR: E. Unten VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB017 Pg001 FIB 00018 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-BASIC FOUR-4309,EVDT-----------------FIB018 Pg001 FIB 00019 11/07/85 *** Information on Power Supplies with soldered or detachable cables *** The power supply for the EVDT, ICN MM783010 is no longer available as a new part from Basic Four. It is being replaced by a supply that is common to several other VDTs currently in use. The only difference between the two supplies is that the newer supply uses a detachable cable in place of the cable that is soldered to the PCBA of the old supply. The detachable cable, ICN MM788130 uses additional wires, but is identical to the soldered cable and will mount in the same manner. ICN for the new power supply is MM780130. Orders for this part will be shipped without any cable. When replacing a supply that has a soldered cable, also order the detachable cable. ORIGINATOR: C. GAHAN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB019 Pg001 FIB 00020 11/08/85 *** New revision of firmware and Character Generator PROMs available *** Basic Four has released new firmware and character generator PROMs for the EVDT Logic Bd., MM780010 to allow compatibility with the new VDT that is now being shipped, the DT-4312 (Sorbus type 4322). The change will cause the machine to poll the keyboard during power-on to determine which type is attached, and decode the key positions accordingly. The new PROMs will be installed at repair depots. Replacement boards will be now using Firmware Release Level G. Boards with Basic Four etch number 904935-001 (firmware PROMs 165031-098, 165031-099, 165031-100 at 10A, 7A, 8A, respectively, and Char. Gen. PROM 165046-010 at 13J) and etch number 904733-001 (with the same firmware PROMs at 4E, 3E, 2E and Char. Gen. at 10G) become Rev. level AG. ORIGINATOR: C. GAHAN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB020 Pg001 FIB 00021 12/18/85 *** ECN available to improve static immunity at the keyboard *** An engineering change has been announced to improve static electricity immunity that may be induced into the machine at the keyboard. The improvement connects the keyboard chassis to the ground on the circuit board at the points where ground returns to the Logic Board in the connecting cable. This will be installed on all keyboards cycled through the repair center. If this appears to be a problem and the keyboard does not need replacing, ECN #10797 may be installed in the field. Remove the four screws holding the cover and take circuit board out of cover. Solder a 3" piece of insulated 22 or 24 gauge stranded wire to clip YY016791. Solder the other end to J1, pins 4 and 6, using care not to cause shorts to nearby land patterns. Slide the clip on to the base at the right side, or at the opening of the "foot" hole, whichever is the more convenient, and reinstall the cover. DRAWING INFORMATION: See hardcopy of Mini Alert 409A for drawing. ORIGINATOR: C. GAHAN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB021 Pg001 FIB 00022 08/25/87 *** NEW STYLE MONITOR BOARD_ *** SYMPTOM/TEXT: A NEW REVISION OF THE MM780030 MONITOR BOARD HAS BEEN RELEASED. THIS BOARD WITH SUBSCRIBER #TS20205144 IS CHARACTERIZED BY A SINGLE 4 PRONG YOKE CONNECTOR. PART # FOR THE NEW MONITOR BOARD IS MM780035 AND MUST USE A NEW STYLE YOKE PART #MM780125. SOME OF THESE NEW BOARDS ARE IN THE FIELD UNDER PART #MM780030 SO ADJUST INVENTORY AS NEEDED. THE GROUND WIRE CAN BE SOLDERED TO THE BRAIDED GROUND ON THE TUBE. IF A GROUND . LUG IS ON THE WIRE , CLIP IT OFF AND SOLDER. ORIGINATOR: BARRY MATTHEWS VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB022 Pg001 FIB 00023 09/08/87 *** Monitor Boards & Yoke Update. *** SYMPTOM/TEXT: Logistis is not shipping any more the Falco set, MM780030 Monitor &.MM780120 Yoke; or the new style MM780035 Monitor & MM780125 Yoke. The only set available is the C.Itoh, MM780040 Monitor & MM788150 Monitor. They are supposed to fit any picture tube. FIX: Order only MM780040 & MM788150. ORIGINATOR: Pat Salcedo. VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB023 Pg001 FIB 00024 05/03/88 *** SWITCH 6L ON MAIN LOGIC *** SWITCH 6L IS F0R DIAGNOSTIC BOARD REPAIR AND SHOULD BE LEFT WITH ALL SWITCHES OPEN FOR NORMAL OPERATION. ORIGINATOR: J WHALEN VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB024 Pg001 FIB 00025 08/16/88 *** Rev. G firmware required for MAI OFFICE *** SYMPTOM/TEXT: In order for MAI OFFICE to operate properly from a 4309 EVDT, particularly in regards to slaved printers the firmware level should be at Rev. G. See FIB #20 in this section for details. ORIGINATOR: Barry Matthews VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB025 Pg001 FIB 00026 02/23/89 *** Part Number for P/S Standoffs *** SYMPTOM/TEXT: The nylon standoffs that support the P/S PCBA have been breaking due to age and heat. FIX: Replace them with P/N YY015515. It is suggested that each FE order a quantity for his personal tool bag. ORIGINATOR: Mike Pindjak LOGON: TANKJ VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB026 Pg001 FIB 00027 09/08/89 *** Keyboard Enclosures no Longer Refurbished, Use Customer's *** As of 10/02/89 the Tustin Repair Center will no longer refurbish the 4309 keyboard enclosure (P/N MM783020/4004333) to a like new condition (ie: they will no longer be repainted). They will only be cleaned. The enclosure is being shipped primarily as a means of protection, the customer's keyboard enclosure should be reused as it will probably be in better condition than the one received on the spare. The defective keyboard should be re-installed in the least attractive keyboard enclosure for shipment back to the Repair Center. ORIGINATOR: Norm Jones VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB027 Pg001 FIB 00028 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-BASIC FOUR-4309,EVDT-----------------FIB028 Pg001 FIB 00029 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-BASIC FOUR-4309,EVDT-----------------FIB029 Pg001 FIB 00030 04/24/91 *** Monitor Bd MM780030 no Longer Available *** SYMPTOM/TEXT: Monitor Bd MM780030 may be replaced with MM780006 CRT assy, which consists of the following parts: MM783061---CRT MM780040---Monitor Board MM788150---Yoke Assy The old Monitor Bd (MM780030) should be returned for repair, the other parts (CRT and Yoke) should be returned to stock if they are still good parts. ORIGINATOR: John Tank MODIFIED BY: Norm Jones VIDEO TERMINAL-BASIC FOUR-4309,EVDT-----------------FIB030 Pg001