MAI COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN SERVICE GROUP(S): MICRO,MINI MFG: CENTURY DATA NACS TYPE(S): 9659,9660 MFG. MODEL(S): M20,M40 CATEGORY: DISK I/O DESC: MARKSMAN *** TABLE OF CONTENTS AS OF 02/14/95 *** FIB 00001.General Information.........................................10/27/86 FIB 00002.Potential Loss of Data on 40MB Drives - Basic Four Only.....07/06/82 FIB 00003.Sequence Down/Loss of Ready/Read-Write Errors...............08/24/82 FIB 00004.Motor Control PCBA Schematics...............................03/03/83 FIB 00005.General Precautions on Fixed Media Disks....................12/01/83 FIB 00006.Self-Test Prom..............................................12/08/83 FIB 00007.Disk Interface PCB Power Connector - Basic Four Only........12/08/83 FIB 00008.Potential +5V Short to Ground on Disc Interface BD - B/4 Onl12/08/83 FIB 00009.Procedure for Upgrading from 20MB to 40MB - Basic Four Only.12/08/83 FIB 00010.Damper for Spindle Ground Brush to Reduce Audible Noise.....12/08/83 FIB 00011.Potential Corruption of Disk Directory at OS Level 5.3B - B/12/08/83 FIB 00012.*FORMP Disk Formatter Program Instructions - Basic Four Only01/25/95 DISK.I/O-CENTURY DATA-M20,M40-----------------------Table Of Contents Pg01 of 01 FIB 00001 10/27/86 *** General Information *** When this drive is used on a Basic Four S80 system it has no machine type of its own. It is included in the Sorbus machine type 4263 FMC (File Manager Computer). The Marksman drives are 14" sealed media drives utilizing a stepper motor positioner and an external optical timing disk for clock & index timing. It is not a Winchester style of fixed disk in that it does not have a servo head or a linear motor positioner. The externally mounted optical timing disk is VERY SUCCEPTABLE TO DUST. *** Sorbus Machine Types and Feature Numbers *** 9659,9660 *** Available Documentation *** Century Data Marksman Disk Drive Tech Manual M10/20/40 - SHDBK-558 Century Data Marksman M20/40 Maintenance diagrams - - - SHDBK-635 Basic Four 2600 Fixed Media Disk Drive Manual - - - - - SHDBK-257 *** Available Training *** Training was included in the Basic Four S80 class which is no longer on the education department schedule. *** Special Tools *** There are no special tools required to service this disk. *** Special Administrative Procedures *** There are no special administrative procedures required. ORIGINATOR: N. Jones DISK I/O-CENTURY DATA-M20,M40-----------------------FIB001 Pg001 FIB 00002 07/06/82 *** Potential Loss of Data on 40MB Drives - Basic Four Only *** Original Document Name - System Software Bulletin 067 Do not write to any 40MB disk drive while using any BOSS level lower than 5.3B!! Due to changes in 5.3B to accomodate the 40MB drive, any write to a 40MB drive with an OS level below 5.3B will cause unrecoverable damage to portions of the disk requiring reformatting. ORIGINATOR: S. MULLER DISK I/O-CENTURY DATA-M20,M40-----------------------FIB002 Pg001 FIB 00003 08/24/82 *** Sequence Down/Loss of Ready/Read-Write Errors *** Original Document Name - Tech Talk 3-IX-8 SUBJECT: 20MB/40MB Disc Drives System S/80 - sequence down/dropping ready problems NOTE: BEFORE ANY DISK TROUBLESHOOTING IS PERFORMED BE SURE THE DISK IS COMPLETELY BACKED UP. IF A BACKUP CANNOT BE PERFORMED DUE TO DISK ERRORS INSURE THE CUSTOMER HAS EXHAUSTED ALL POSSIBLE METHODS OF DATA RECOVERY BECAUSE IN ALL PROBABILITY THERE WILL BE TOTAL LOSS OF DATA ON THE DISK. The index/clock timing disc may accumulate dust over a period of time. The usual symptom of dust collection is intermittant read/write errors and dropping ready. There are two types of timing discs in the field: 1. Older drives have a metal timing disc which is susceptable to dust collection. To decrease the dust accumulation in the timing disc slots, there is now available a Mylar disc cover which is placed over the existing wheel. 2. Newer drives have a solid Mylar timing disc which collects very little dust. The metal disc with the Mylar cover should be cleaned every 6 months. The solid Mylar disc should be cleaned every 12 months. NOTE: These suggested time intervals are for a relatively clean environment. If the environment is dirty the disc should be cleaned more frequently. To clean both types of timing discs: 1. Gain access to the timing disc with the drive powered off. 2. Blow away dust particles using compressed air (canned air). The mylar disc (PN MM990030, 75839-001 - Timing Wheel Cover, multiples of 10) should be installed in all drives with a metal timing disc. To install the timing wheel cover: 1. Ensure that a current backup exists, because this update will render the disc unreadable. 2. Disconnect FMC AC power from source. 3. Remove FMC top cover and front panel. 4. Slide floppy drives toward front of FMC to gain access to fixed disc drive. 5. Remove belt cover by removing the four screws. 6. Remove belt by pulling outward near the spindle while rotating disc by hand. 7. Remove the spindle ground brush. DISK I/O-CENTURY DATA-M20,M40-----------------------FIB003 Pg001 8. Clean entire timing wheel thoroughly using alcohol and then air dry. 9. Partially pull approximately 1" of protective paper backing away from the Mylar disc and cut the BACKING with scissors. 10. With the cut located to the rear of the unit, slide the Mylar disc under the photo-detector with the paper backing positioned against the timing wheel. Position the Mylar disc against the timing wheel, verifying that it is properly centered. 11. Peel off backing while rotaing disk and applying light pressure to hold the Mylar disc in place. Continue until all backing is removed. 12. Rotate spindle while applying pressure to the Mylar disc to ensure good adhesion. 13. Reinstall belt, ground brush, and belt cover. 14. Return floppies to original position. 15. Replace FMC covers. 16. Connect ac power to source. 17. Run *FORMP to totally reformat the disk, then restore customer data. If read/write or dropping ready problems persist the sensor may be weak. Check as follows: 1. Using an oscilloscope, connect channels A and B of the scope to pins 2 and 3 of IC A49, on the basic control IV (Nevada) board. Differentially measure the signal voltage at these points. Voltage should be a minimum of 4V peak to peak. 2. Connect channels A and B of the scope to pins 5 and 6 of IC A49. differential voltage at these points should be a minimum of 4V peak to peak. If either of the above voltage checks cannot be met, the photo sensor (PN MM276010, 21084-001) should be replaced. ORIGINATOR: N. Jones DISK I/O-CENTURY DATA-M20,M40-----------------------FIB003 Pg002 FIB 00004 03/03/83 *** Motor Control PCBA Schematics *** Original Document Name - Mini alert 125 SUBJECT: MODEL 2600 FIXED MEDIA DISC DRIVE, /S80 SYSTEM Service Manual BFISD 8050 does not contain the motor control PCBA schematic which may be required in troubleshooting the /S80 Fixed Media Disc Drive. The diagram below includes appropriate wiring connections. DRAWING INFORMATION: See Mini Alert 125 hardcopy for schematic. ORIGINATOR: J. Rippl DISK I/O-CENTURY DATA-M20,M40-----------------------FIB004 Pg001 FIB 00005 12/01/83 *** General Precautions on Fixed Media Disks *** Original Document Name - Mini Alert 209 SUBJECT: FIXED MEDIA INSTALLATION PRECAUTION Disk drives with fixed media, with some exceptions, utilize locking devices for the read/write head assembly and motor spindle assembly. These locking mechanisms prevent/minimize media damage during shipment of the unit. Upon receipt of a fixed media disk drive, either as a replacement unit or as part of a system, note that if the appropriate locking devices are not in the proper positions for shipment (locked), DO NOT ATTEMPT TO INSTALL THE UNIT. Order a replacement unit as follows: New installations: Notify BFISD Customer Satisfaction for replacement unit. Spares unit: Re-order from Materials West. Ship the defective unit in its proper shipping container and ensure that the locking devices are in their proper shipping positions. Also clearly indicate on the disk unit and shipping documentation that the unit was rejected due to improper shipping procedures and indicate which locking device was not properly locked. ORIGINATOR: J. Rippl DISK I/O-CENTURY DATA-M20,M40-----------------------FIB005 Pg001 FIB 00006 12/08/83 *** Self-Test Prom *** Original Document Name - Tech Talk 3-IX-2 Newer Marksman 20MB disc drives have PROM enhancements to include a built in self test to check disc drive operation upon power-up. The results of this self test are indicated by the DISC READY LED. After the three minute delay (warmup period) the LED will illuminate to indicate PASS or remain off to indicate FAIL. During this test a vibration caused by rapid head movement may be noticed. Due to an error in PROM firmware, some 20MB drives with the self test feature may illuminate the DISC READY LED prematurely. The DISC READY LED should illuminate after a three minute delay (warm up period). However, the erroneous PROMS cause it to light after 15 seconds. To identify erroneous PROMs check all basic control IV (Nevada) PCBs (PN 22564-022, MM271010) installed and spared using the following procedure: 1. Inspect the PROM in location XA19 for the conditions listed below and perform the respective action. CONDITION ACTION No PROM at XA19 - - - - - - - - - FMK not applicable (no self test) PROM is 23981-002 (or higher) - - FMK already installed PROM is 23981-001 - - - - - - - - Order FMK The part number for the FMK is MM990022 PN FMK 09-307 CAUTION Single PROM board cannot accept the self test enhancement. ORIGINATOR: N. Jones DISK I/O-CENTURY DATA-M20,M40-----------------------FIB006 Pg001 FIB 00007 12/08/83 *** Disk Interface PCB Power Connector - Basic Four Only *** Original Document Name - Tech Talk 3-IX-3 The disk interface PCB (PN 903221-001, MM270000) is shipped with a new version DC power connector (J4). When a disk interface PCB must be replaced, it may be necesary to replace the dc power plug (P2). If the revision is AX4 or higher the PCB has the newer style connector (2 square pins in a 2-pin connector). If the pcb has the old style connector (3 pin Molex - round pins) it will be necessary to replace the DC power plug. Order the complete power cable harness MM278010, 906447-001. ORIGINATOR: N. Jones DISK I/O-CENTURY DATA-M20,M40-----------------------FIB007 Pg001 FIB 00008 12/08/83 *** Potential +5V Short to Ground on Disc Interface BD - B/4 Only *** Original Document Name - Tech Talk 3-IX-5 The mounting bracket for the disc interface PCB (found on newer Marksman drives. only) may be installed incorrectly. This may cause a short between +5V and ground and prevent the FMC from powering up. Check the installation of the mounting bracket (PN 906896-001) to ensure the notch in the mounting bracket lines up with connector J4 on the Interface PCB. If it is mounted incorrectly it will be necessary to reverse the direction of the plunger-type fasteners. DRAWING INFORMATION: See Tech Talk 3-IX-5 for drawing. ORIGINATOR: N. Jones DISK I/O-CENTURY DATA-M20,M40-----------------------FIB008 Pg001 FIB 00009 12/08/83 *** Procedure for Upgrading from 20MB to 40MB - Basic Four Only *** Original Document Name - Tech Talk 3-IX-6 Upgrading a Basic Four S80 FMC from 20MB to 40MB requires that the entire fixed disc drive be replaced with a 40MB version. Use the following procedure: 1. Remove the new drive from packaging material, save the material for returning the old drive. 2. Remove the 20MB drive from the system. 3. Remove mounting hardware from 20MB drive and install on the 40MB drive. 4. Remove the Basic Four interface board and mounting hardware from the 20MB drive and mount on the 40MB drive. 5. Install 40MB drive in the S80 cabinet and reconnect all cables. 6. Format the disk with *FORMP which is on BOSS diskettes at levels 5.3B and above. Do not format using *FORMH or *FORMU as these will not format the entire disk. 7. Install the operating system (level 5.3B or later) using *INSTL. 8. Have customer restore programs and data using *B. 9. Test drive with