MBF COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN SERVICE GROUP(S): MICRO,MINI MFG: SHUGART NACS TYPE(S): 0800,8581,9658 MFG. MODEL(S): 800,801,850,851,900,901 CATEGORY: DISK I/O DESC: 8" FLOPPY *** TABLE OF CONTENTS AS OF 12/19/90 *** FIB 00001.General Information.........................................12/09/86 FIB 00002.Read/Write Failures Caused by Index/Sector Photosensor - 85004/01/81 FIB 00003.Read/Write Board Shorting Plugs - 851, BASIC FOUR...........06/25/81 FIB 00004.Shugart Approved Diskettes for Model 850....................10/23/81 FIB 00005.Head Cleaning Diskettes - Don't Use Them - 850/851..........10/23/81 FIB 00006.Cabling and Termination Information - 850 on B/4 S80 System.12/08/83 FIB 00007.Jumper Information for R/W PCBA P/N 25216...................01/17/90 DISK I/O-SHUGART-800,801,850,851,900,901------------Table Of Contents Pg01 of 01 FIB 00001 12/09/86 *** General Information *** This FIB group includes all Shugart 8" floppy disk drives. *** NACS MACHINE TYPES AND FEATURE NUMBERS *** 0800,8581,9658 *** AVAILABLE DOCUMENTATION *** Basic Four Model 2000 Service Manual - S-HDBK-252 *** AVAILABLE TRAINING *** Models 850/851 are included in the Basic Four S80 course. *** SPECIAL TOOLS *** 850/851 Alignment Diskette - MM269010 900/901 Alignment Diskette - CS000129 *** SPECIAL ADMINISTRATIVE PROCEDURES *** The model 850/851 floppy disk drive used in the Basic Four S80 has no Sorbus machine type of its own, it is included in the machine type for the FMC (File Manager Computer - 4263). ORIGINATOR: N. Jones DISK I/O-SHUGART-800,801,850,851,900,901------------FIB001 Pg001 FIB 00002 04/01/81 *** Read/Write Failures Caused by Index/Sector Photosensor - 850/851 *** Original Document Name - TECH TALK 3-VII-4 SYMPTOM: Read/write errors and failure to format. PROBLEM DETERMINATION: Using a Tektronix 465 or equivalent scope perform the following: SCOPE SET UP CH1 set to 1V/DIV - DC CH2 set to 1V/DIV - DC Set VERT MODE to CH1 Set TIME DELAY position to 8. (nominal) Set B DLYD trigger coupling to AC Set B DLYD trigger SOURCE to STARTS AFTER DELAY Set Main time Base to 20 ms. Set DLYD SWEEP to 2 ms. Set HORIZONTAL DISPLAY to B DLYD A TRIG mode to NORM A TRIG source to CH2 A trigger hold off to normal A trigger coupling to AC TEST PROCEDURE Install a hard sectored diskette in drive. Connect CH1 to brown wire on index/sector photosensor. Connect CH2 to TPI (INDEX) on drive R/W Control Board. Adjust A TRIG level if necessary. Set CH1 to 0 volt reference. Verify voltage levels for peaks A and B; do not exceed .5V (Figure 3). The problem is due to the response time of the photosensor, and it fails to drive to ground. Each pulse should drive to near ground level or the photosensor is defective. FIX: Replace defective Index/Sector Photosensor (MM266020,51046-0) DRAWING INFORMATION: See TECH TALK 3-VII-4 for drawing information ORIGINATOR: N. Jones ,-. DISK I/O-SHUGART-800,801,850,851,900,901------------FIB002 Pg001 FIB 00003 06/25/81 *** Read/Write Board Shorting Plugs - 851, BASIC FOUR *** Original Document Name - Basic Four TECH TALK 3-VII-5 See the TECH TALK for a schematic representation of the drive Read/Write electronics board with jumper information and locations. ORIGINATOR: Dieter Goehrisch DISK I/O-SHUGART-800,801,850,851,900,901------------FIB003 Pg001 FIB 00004 10/23/81 *** Shugart Approved Diskettes for Model 850 *** Original Document Name - Basic Four TECH TALK 3-VII-7 The following is a list of diskettes approved by Shugart for use with the model 850 disk drive. MANUFACTURER MODEL NO. DESCRPTION Dysan 151/2D Double density, double sided, 32 sector holes Maxell FH2-32D Double density, double sided, 32 sector holes Customers should be informed that if they use diskettes other than those approved by the manufacturer data integrity problems may occur. There may be diskettes approved by Shugart in the future. If a manufacturer of diskettes is not listed here it does not mean they will not work, but that they were not on Shugart's approved list at the time of publication. ORIGINATOR: TIC DISK I/O-SHUGART-800,801,850,851,900,901------------FIB004 Pg001 FIB 00005 10/23/81 *** Head Cleaning Diskettes - Don't Use Them - 850/851 *** Original Document Name - Basic Four TECH TALK 3-VII-6 There are commercially available products intended for cleaning read/write heads on floppy dik drives. These "head cleaning diskettes" caused damage to the heads during an investigation. Therefore, such cleaning products must NOT be used. Moreover, the read/write heads on the model 850/851 floppy disk drive do not require cleaning by any method. Also do not lubricate any parts on the disk drive. Dust and dirt can accumulate and cause damage. ORIGINATOR: TIC DISK I/O-SHUGART-800,801,850,851,900,901------------FIB005 Pg001 FIB 00006 12/08/83 *** Cabling and Termination Information - 850 on B/4 S80 System *** Original Document Name - TECH TALK 3-VII-8 The floppy disk drive interface bus cable (P/N 906456 which is used on the Basic Four S80 System between the FMM PCB and the drives) has connectors for two floppy drives regardless of drive configuration. Cable and terminate as follows: ONE DRIVE SYSTEM In systems containing one floppy disk drive, the drive should be connected to the end connector on the bus cable. The middle drive connector should be left disconnected. Verify that termination resistor networks R1 and R20 are installed on the encode/decode PCB. TWO DRIVE SYSTEM In system containing two floppy disk drives, the middle connector must be connected to the encode/decode PCB of drive F1. The end connector should be connected to the encode/decode PCB of drive F0. Verify that termination resistor networks R1 and R20 are installed ONLY in the encode/decode PCB of drive F0. The following two rules apply: 1. F0 is always at the end of the cable. 2. F0 always contains the termination resisor networks. ORIGINATOR: TIC DISK I/O-SHUGART-800,801,850,851,900,901------------FIB006 Pg001 FIB 00007 01/17/90 *** Jumper Information for R/W PCBA P/N 25216 *** _________________________________________________________________________ | FS | | ___ | | M2FM |x x|S1 | | o o | | |x| | | |x| | | MFM | | | | __| | _ | | |x| | | |x| ___ |__ | FM IT|x x| | | | | S2 o4B | | M HL DL Y _ DS4 o o | | ___ ___ |x| o3B | | |x x| o o|x x|o o S1 o|x|o S3 DS3 o o | | - o2B | | H DS2 o o | | L B I S o1B | | __________ DS1|x x| | | | |||||||| | --- | | | |x|x|||| | | J | | |||||||| | | 1 | ---------- | | Z A X R | | | | RS D C | | _ _ _ | | |x| |x|x| | | |x|oRM o o |x|x| | | DS HI IWG o | | _ DC o | | o|x| o o o | |__ |x| o o | | IWI 2S __| | | __| 851 | | ___ |__ | |x x| | | o | | 850 | | | | __| | |__ |__ | |______________________________________________________________________| NOTE: o indicates a jumper pin which is not jumpered x indicates a pin which is jumpered ORIGINATOR: Norm Jones DISK I/O-SHUGART-800,801,850,851,900,901------------FIB007 Pg001