MBF COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN SERVICE GROUP(S): MINI MFG: PRIAM NACS TYPE(S): 4501 MFG. MODEL(S): P120,P154,P33,P66 CATEGORY: DISK I/O DESC: 14" FIXED MEDIA *** TABLE OF CONTENTS AS OF 12/19/90 *** FIB 00001.General.Information.........................................11/24/89 FIB 00002.Fails to Come Ready or Takes Excessive Time to Ready........03/23/82 FIB 00003.Wire Color Coding Different on Xentek Power Supply..........03/07/83 FIB 00004.Power Supply Diagram Error in BFISD 8052, -5V Pot Incorrect.03/07/83 FIB 00005.Some Cables for B/4 810 were Shipped with Shield & Logic GND08/24/83 FIB 00006.Maximum Allowable Defective Tracks..........................09/02/83 FIB 00007.General.Information & Cautions Concerning the Analog Logic P10/11/83 FIB 00008.General Precautions on Fixed Media Disks....................12/01/83 FIB 00009.Drives from Sorbus West will be Formatted Before Shipment...01/11/84 FIB 00010.Head Cable Damage When Changing Analog PCBs.................02/01/84 FIB 00011.Analog Logic PCBA Interchangability Information.............02/28/84 FIB 00012.Split Logic Boards no Longer Available on 33MB Drive........03/05/84 FIB 00013.Logic PCBAs Test Point Cross Reference Information..........10/23/85 FIB 00014.ERR.3,7,1,11 while attempting a tape load OS slot update - P05/03/88 FIB 00015.GROUND STRAPS REMOVED FROM DRIVE............................09/22/88 FIB 00016.THERMAL SHOCK or when to install a drive after extreme temp 02/22/89 FIB 00017.PCBA Compatability with Single-Action-Lock HDAs.............11/24/89 DISK I/O-PRIAM-P120,P154,P33,P66--------------------Table Of Contents Pg01 of 01 FIB 00001 11/24/89 *** General Information *** The Priam Pxxx series drives are 14" Winchester fixed disk drives utilizing a servo head, linear positioner and stepper drive motor with external optical shutter for stepper motor phasing. The external motor phase sensors are somewhat sensitive to dust and require regular PM with the frequency dependent on the cleanliness of the environment. Basic Four uses the Priam 14" drives in their 110, 210, 310, 1600, 810 and 8000 Systems. There are three models: Model Capacity R/W Heads Cylinders P33 33 MB 3 556 P66 66 MB 3 1116 P154 154 MB 7 1116 *** Sorbus Machine Types and Feature Numbers *** Description Sorbus Type P66 in a Basic Four 210 System ........................................4221 P33 in a Basic Four 110 System ........................................4224 P154 in a Basic Four 310 System ........................................4298 P154 in a Basic Four 810 System ........................................4307 P154 in a Basic Four 1600 System ........................................4319 P154 in a Basic Four 8000 System ........................................4354 *** Available Documentation *** Basic Four Model 4501 Fixed Media Disk Service Manual .............. S-HDBK-B04 Corrections to the Service Manual: Switch Settings on page 2-4 (split board) are incorrect, use the following charts for normal (on-line) settings: Drive Address 8J O=open/off C=closed/on 8 7 6 5 4 3 2 1 - Switch position O C O O O O O O - Normal Setting for B/4 13xx Systems O C O O O C C C - B/4 MPX Series Systems Drive 0 O C O O O C C O - B/4 MPX Series Systems Drive 1 O C O O O C O C - B/4 MPX Series Systems Drive 2 O C O O O C O O - B/4 MPX Series Systems Drive 3 O C O O O O C C - B/4 MPX Series Systems Drive 4 O C O O O O C O - B/4 MPX Series Systems Drive 5 O C O O O O O C - B/4 MPX Series Systems Drive 6 O C O O O O O O - B/4 MPX Series Systems Drive 7 Sector/Track Number 10F O=open/off C=closed/on 8 7 6 5 4 3 2 1 - Switch Position O O O C O O C O - Normal Setting For all B/4 systems Switch Settings on pages A4 and A5 are incorrect, use the following charts DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB001 Pg001 for normal (on-line) settings for the single board version: Drive Address 10N O=open/off C=closed/on 8 7 6 5 4 3 2 1 - Switch position O C O O O O O O - Normal Setting for B/4 13xx Systems O C O O O C C C - B/4 MPX Series Systems Drive 0 O C O O O C C O - B/4 MPX Series Systems Drive 1 O C O O O C O C - B/4 MPX Series Systems Drive 2 O C O O O C O O - B/4 MPX Series Systems Drive 3 O C O O O O C C - B/4 MPX Series Systems Drive 4 O C O O O O C O - B/4 MPX Series Systems Drive 5 O C O O O O O C - B/4 MPX Series Systems Drive 6 O C O O O O O O - B/4 MPX Series Systems Drive 7 Sector/Track Number 12K O=open/off C=closed/on 8 7 6 5 4 3 2 1 - Switch Position O O O C O O C O - Normal Setting For all B/4 systems *** Available Training *** Video Tape Course ...V-097-0 - Located in each District Library Included in Basic Four BBIII Basic Course at both Education Centers *** Special Tools *** None required. *** Special Administrative Procedures *** None required. ORIGINATOR: Norm Jones DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB001 Pg002 FIB 00002 03/23/82 *** Fails to Come Ready or Takes Excessive Time to Ready *** Original Document Name - Mini Alert 28 The following symptoms occur when the drive is turned on: 1. The spin motor fails to turn but will turn if moved a few degrees (as though the motor had a dead spot). 2. The spin motor emits a howling sound. 3. The drive takes several minutes to come ready. 4. The drive access mechanism makes clunking sounds and fails to ready. CAUSE: bad output of the photocell PCB P/N MM290050 .This may be caused by dust or a defective pcb. ORIGINATOR: Norm Jones DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB002 Pg001 FIB 00003 03/07/83 *** Wire Color Coding Different on Xentek Power Supply *** Original Document Name - Tech Talk 3-VIII-8 The color coding of the wires on the DC output connector of the Xentek power supply does not follow the color coding of the wires on the DC output connector of the Power One power supply. The voltage assignments, however, are the same. ORIGINATOR: Rich Novak DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB003 Pg001 FIB 00004 03/07/83 *** Power Supply Diagram Error in BFISD 8052, -5V Pot Incorrect *** Original Document Name - Tech Talk 3-VIII-9 There is an error in the early Priam manual (BFISD 8052) relating to the -5V adjustment pot. Page 3-6 incorrectly shows pot R38 (-5V) situated alone on one side of the Power One type power supply. The -5V adjustment pot is actually next to the +5V adjustment R40. Later versions of this manual (BFISD 8062) show the -5V adjustment pot in the correct position. ORIGINATOR: Paul Schaub DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB004 Pg001 FIB 00005 08/24/83 *** Some Cables for B/4 810 were Shipped with Shield & Logic GND Short *** Original Document Name - Mini Alert 161A SUBJECT: SYSTEM 810 PRIAM DISK CABLES THIS MINI SYSTEMS ALERT SUPERSEDES MINI SYSTEMS ALERT #161 Some Priam internal radial and bus cables may have logic and shield grounds tied together. The incorrect cables may or may not affect disk operation, depending on the AC power wiring in the site or building. This incorrect cable could potentially cause excessive soft errors, or cause the disk to drop ready, or remain off-line. The 810 grounding philosophy calls for a single point logic ground/chassis ground tie point. This point is in the primary mainframe. Shorting the disk cable pin 1 (logic ground) to the shield violates the 810 grounding scheme. This results in ground loops, etc., the magnitude of which is site dependent. The cables that could be incorrect are the Priam internal bus, P/N 907154-001/002 and the internal radial, P/N 907155-001/002. If these cables have a red pin 1 identifier stripe it is a good cable. If these cables have a black (sometimes blue) pin one identifier stripe they are the incorrect cables and should be replaced. The black stripe indicates logic (pin 1) and shield are tied together. If you have any of the incorrect cables, order replacement cables: MM280370 907154-001 Radial Cable, short MM280430 907154-002 Radial Cable, long MM280380 907155-001 Bus Cable, short MM280440 907155-001 Bus Cable, long For each 810 system that requires the cable retrofit, you will be reimbursed $50.00. Use service code 09 on the IR. Collect all of the IR's written for the month and submit a Special Billing Request to Data Base, Attention: Noreen Hetzel. Indicate ECN 8596 in the Symptom and Trouble Found section. Since the field will be charged for ordering the replacement cables, the defective cables should be returned on a Defective Material Tag, coded Defective from Stock with ECN 8596 indicated in the comments section. This will reimburse you for the cables. ORIGINATOR: J. Kanzler DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB005 Pg001 FIB 00006 09/02/83 *** Maximum Allowable Defective Tracks *** Original Document Name - Tech Talk 3-VIII-7 Capacity Max Defects Field Spare from Repair Tracks 33 MB 40 41 66 MB 75 51 154 MB 230 64 (13xx) 154 MB 230 50 (8xxx) ORIGINATOR: TIC DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB006 Pg001 FIB 00007 10/11/83 *** General Information & Cautions Concerning the Analog Logic PCBA *** Original Document Name - Mini Alert 193 SUBJECT: 33/66/154 MB Analog Logic PCBA The Analog Logic PCBA's for the 33/66/154 MB Priam disk drives must be carefully checked for compatibility prior to replacement for defective boards. The servo disk surface may be written with one of two pattern styles on the 154 MB unit. Quad patterns were used on the original units while later units used a Mirrored Servo (MIS) pattern. The electronics on the Analog PCBA is different for each . type of servo. Further, the Head Disk Assembly (HDA) may utilize a narrow grounding strap (1/4") attached to the analog PCBA near one corner or alternately, may use a wide grounding strap attached near the center of the Analog PCBA. Typically, for purposes of identification, 154 MB HDA's with a wide grounding strap are written with the MIS pattern while the narrow ground strap indicates the original Quad pattern. See table below. Newer Analog Logic PCBA's contain changes which allow use on either of the two style HDA's. The board allows connection with both types of grounding straps. Jumper (W9) determines which of the two servo patterns is in use. The following tables summarize HDA and Analog PCBA compatibility: PCBA: MM292030 200213-001/003 PCBA, Analog Logic for 66/154 MB units. MM292050 200213-002 PCBA, Analog Logic for 33 MB units only. MM292030 200213-001 Jumper out, use on 66 MB or 154 MB w/Quad -003 Jumper in, use on 154 MB w/MIS 154MB HDA REV. GROUND STRAP ANALOG REV. W9 JUMPER Servo Pattern Below 1825 Narrow ==> ANY Out Quad 1825 & above Wide ==> 1819 & above In MIS NOTE: Jumper W9 may be installed/removed by field personnel as required. CAUTION: REMOVING SCREW RETAINING GROUND STRAP TO HDA WILL CAUSE MEDIA CONTAMINATION! DRAWING INFORMATION: See Mini Alert 193 hardcopy for drawings. ORIGINATOR: J. Rippl DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB007 Pg001 FIB 00008 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-PRIAM-P120,P154,P33,P66--------------------FIB008 Pg001 FIB 00009 01/11/84 *** Drives from Sorbus West will be Formatted Before Shipment *** Original Document Name - Mini Alert 215 NOTE: The format may be either 13xx or 8xxx when received. If a surface read works with no errors then use this FIB otherwise a full format will be required. SUBJECT: PRIAM DRIVES TO BE PRE-FORMATTED FROM NACS WEST REF: Part numbers= MM291000 (66mb), MM292000 (154mb), MM293000 (33mb) In order to reduce customer down-time and field maintenance time on 110/210/310 systems, NACS WEST will pre-format all Priam drives and leave the Fault Map intact. To make use of the pre-formatted drives, the field Service Representatives will require the ability to change the User System Serial Number without re-formatting the drive. A "change serial number" option will be added to FORMP and FORMAP. The SR will be able to perform a Full-Surface Read to verify that the disk can be scanned error-free, and that the map matches the sector headers. He can then change the serial number to match the customer system and perform Sector-Zero Recovery with the appropriate program (FORMAP for level 3.X and FORMP for level 4.X). Leaving the disk ready to install the customer BOSS without formatting at the customer site. The "change serial number" option will require an authorization code to be issued, as is now the case with any disk having no map, but will not require a new map to be generated by re-formatting, so long as one exists. It will no longer be necessary to run %MSCRUB. Drives should not be re-formatted once the new option is available unless the existing map contains tracks which were flagged as bad due to maladjustment or hardware failures previously corrected. Another enhancement planned for the format programs is the provision for re-entering an incorrectly entered authorization key. Presently, this requires the drive to be formatted again before a map will be generated. It is intended that the new FORMAP and FORMP programs be included on tapes which will also have :DOS and SILVER along with other 13xx machine-level diagnostics. You will be advised by MINI-ALERT and TECH TALK when these tapes become available and a part number will be supplied at that time. These programs will also be released on BOSS updates at that time. The only program in use now that provides the "change serial number" option is TIF, the Track Inter-action Format program contained on some :DOS tapes sent to Specialists recently. If you have this program now, you may commence use of it in the manner described above. ORIGINATOR: J. Vanderheyden DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB009 Pg001 FIB 00010 02/01/84 *** Head Cable Damage When Changing Analog PCBs *** Original Document Name - Tech Talk 3-VIII-16 To prevent damage to the cables and connectos (J5, J6, J7 and '10) between the head disc assembly (HDA) and analog PCBA, remove the cable connectors, using a small "L" shaped 0.050 inch Allen wrench. Do not attempt to remove the connectors by hand or pulling on the cable. Insert the Allen wrench from the pin 1 end of the connector to the end of the key notch. Pry the connector up far enough to slide the wrench toward or past the center. Then lift the connector off the socket. When removing the PCBA, make certain that the cables pass through the cable opening without bending the pins. The same care must be used when reinstalling the board. When replacing the connectors, do not press down on the cable material. Place the connector on the socket and press down on the pins to seat the connector. ORIGINATOR: J. Rippl DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB010 Pg001 FIB 00011 02/28/84 *** Analog Logic PCBA Interchangability Information *** Original Document Name - Mini Alert 234 SUBJECT: ANALOG LOGIC PCBA A new artwork has been released by the manufacturer for the Analog Logic PCBA (MM292030 & MM292050). The 200514-01 and 200515-01 boards are an update of the 200213-xx PCBA. The boards are interchangable as noted below. Refer to MSA-193 for specifics on the usage of these boards. ICN MFG. P/N DESCRIPTION MM292030 200213-01 154 MB For HDA below Rev. 1825, jumper W9 out For HDA at/above Rev. 1825, jumper W9 in MM292030 200514-01 For HDA below Rev. 1825, jumper W3 out For HDA at/above Rev. 1825, jumper W3 in MM292050 200213-02 33 MB Jumper W9 out 200515-01 Jumper W3 out NOTE: The only difference between the ICN PCBA's are the W3 and W9 jumpers. ORIGINATOR: J. Rippl DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB011 Pg001 FIB 00012 03/05/84 *** Split Logic Boards no Longer Available on 33MB Drive *** Original Document Name - Mini Alert 237 SUBJECT: TYPE 4224, 33 MB FIXED DISK; TURN-IN OF SPLIT BOARD UNITS The P3350 Fixed Media 33 MB Disk Drive is no longer available in the 'split board' configuration from the vendor. As units with the split boards become defective, they will be exchanged thru the vendor for single board units. Upon servicing this disk unit, follow the guidelines listed below. MM293000 Disk Drive Assembly - Available only as Mfg. part number 330334. Mfg. P/N 330486-01 - Will no longer be available after existing spares have been depleted. Mfg. P/N 330334 - Single board unit. No change. MM298010 Head Disk Asm (HDA) - Available only as Mfg. part number 330330. Mfg. P/N 330485 - All good 330485 HDA's should be used where available. as spares. - All defective 330485 HDA's must be returned to Materials West as complete drives (complete with split boards). Mfg. P/N 330330 - For use with single board only. No change. MM292050 Analog PCBA - Mfg. part number 200213-02 and 200514-01 will be phased out. - All good MM292050 PCBA's should be used where available as spares. - All defective MM292050 PCBA's returned to Materials West will be replaced as long as good replacements are available. - If replacement MM292050 PCBA's are not available, the entire disk unit must be replaced. MM292040 BFISD Interface - Mfg. part number 200258 and 200393 may be used on the 154 MB disk unit and will require no phase-out. ORIGINATOR: J. Rippl DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB012 Pg001 FIB 00013 10/23/85 *** Logic PCBAs Test Point Cross Reference Information *** Original Document Name - Mini Alert 420 The following table identifies the test points and approximate grid co-ordinates of the Priam 14" fixed media PCBAs. DESCRIPTION 200213 200168 200098 200098 200514/15 EC1319 EC1812 ACT UNSAFE + 19: 7E 21: 8J 21: 8E 21: 8E 14: 8E AGC'D SERVO DATA 24: 9E 30:12H 30:14D 20:11E CHANNEL A READ PREAMP 1: 1A 1: 1A 1: 1A 1: 1A 1: 1A CHANNEL B READ PREAMP 3: 1A 5: 2A 5: 2A 5: 2A 4: 2A DAC CURVE 41:16F 41:16F 41:16F DATA 9: 2D 12: 3B 12: 3B DATA + 7: 1G 9: 2G 9: 2G 9: 2G 8: 2F DATA WINDOW 12: 3G 13: 3G 13: 3G 13: 3G 9: 3G DIGITIZED READ DATA 4: 1C 3: 1C 3: 2B 47: 1B 3: 1B DXA + 48:20C 48:21C DXB + 49:20D 49:21D ENABLE 10: 2F 8: 2D 8: 3F ENCODED CLOCK AND DATA 18: 6E 18: 7E FILTERED POSITION 47:20C 47:20C 24:16F FINE TRACK - 29:14G FWD - 22: 9J 19: 9J FWD/ODD + 33:14J GB1 34:14J 28:17J GB2 35:14J 29:17J GROUND (LOGIC) 42:17B 42:18B 42:18B GROUND (R/W) 17: 7A 20: 8A 20: 8A 20: 8A 13: 7B GROUND (SERVO) 22: 8J 22: 8J 22: 8J GROUND (VFO) 2: 1A 2: 1B 2: 1A 2/16:1A/4E 2/10:1A/4E HALF TRACK - 31:14J INDEX + 37:14J 45:13F 23:14H INHIBIT TACH DIFF. 39:15J 39:16J IR 21:13E MOTOR CURRENT 44:19B 44:19B 44:19B MOVE + 30:13J 35:14J 35:14J 35:14J 22:13J MSB + 29:10G 29:11H MSB /2 + 28:11G 28:11G MULTI SEL + 18: 8E 25: 9C 25: 9E 25: 9D 15: 8E NRZ READ DATA 6: 1H 10: 2H 10: 2H 6: 1H DESCRIPTION 200213 200168 200098 200098 200514/15 EC1319 EC1812 OFF/ON MOTOR 23: 9J 17: 8H PHASE ERROR + 11: 3C 11: 3D PHASE ERROR - 14: 2D 14: 3E PHASE FREQ ERROR + 28:13G 26: 8H 26: 9J PHASE FREQ ERROR - 36:14J 19: 6H 19: 6J PLO CORRECTION VOLTAGE 21: 9E 17: 5H 17: 5J 18:10E POSITION DEMODULATOR 36:15C 36:15D POSITION SIGNAL 40:16D 40:16D 40:16E 27:16F READ GATE + 8: 2C 4: 1E 4: 2B 4: 2B 7: 2B SERVO ERROR 46:19C 46:20C 46:14H SERVO POSITION PEAK EVEN 26:13G 32:13D 32:14D SERVO POSITION PEAK ODD 27:13G 33:14D 33:14E SYNC + 5: 1F 7: 2F 7: 1F 5: 2F SYNC - 16: 8G DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB013 Pg001 SYNC DETECT + 25: 9G 31:12H 31:13H TRACK XING - 20: 8J TRACK XING VEL ERROR 34:14G 34:14G VCO CIRCUIT 15: 4F 16: 3E 16: 4E 15: E4 11: 5F VCO CONTROL VOLTAGE + 14: 4D 15: 4E 15: 4E VCO CONTROL VOLTAGE - 13: 4D VCO FEEDBACK 11: 2F 6: 3D 6: 3F VELOCITY 45:19F 45:20F VELOCITY CURRENT 43:18D 43:18E 43:18E WRITE CLOCK B 16: 5E 12: 7E ADJUSTMENTS: GROUND 17: 7A 20: 8A 20: 8A 20: 8A 13: 7B DATA TP 7: 1G 9: 2G 9: 2G 9: 2G 8: 2F DATA WINDOW TP 12: 3G 13: 3G 13: 3G 13: 3G 9: 3G DATA WINDOW ADJUSTMENT R42: 4G R30: 4G R32: 4G R32: 4G R45: 3G WRITE CURRENT ADJUST. R52: 4D R56: 5C R351: 5B R351: 5B R48: 4C WRITE CURRENT TP R36: 4D R55: 5C R46: 5B R46: 5B R39: 3C ORIGINATOR: J. Rippl DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB013 Pg002 FIB 00014 05/03/88 *** ERR 3,7,1,11 while attempting a tape load OS slot update - P154 *** SYMPTOM: After replacing a system disk, an ERR 3,7,1,11 occurrs while attempting to update the OS slots from tape. DEMON (or NEWX) runs without errors and DIVE completes normally without error. PROBLEM DETERMINATION: DEMON and NEWX default maximum cylinder values are less than the maximum cylinders on the disk. To test the entire disk the default values must be changed to: Ending Cylinder = 1115 FIX: The highest numbered track on the disk must be reformatted, bring up DIVE and ROT the highest numbered track: cyl = 1115 hd = 6 Try ROTing the track in place first (don't force a relocation) then if the failure persists force a relocation. Apprarently under some conditions the DIVE program doesn't completely format the drive. ORIGINATOR: N. Jones/B. Berard DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB014 Pg001 FIB 00015 09/22/88 *** GROUND STRAPS REMOVED FROM DRIVE *** THE GROUND STRAPS ON THE 14" DRIVES ARE BEING REMOVED BY PRIAM . TESTS HAVE PROVED THAT THE STRAP IS NOT NECESSARY. ORIGINATOR: JOHN WHALEN DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB015 Pg001 FIB 00016 02/22/89 *** THERMAL SHOCK or when to install a drive after extreme temp change *** The following information is provided by engineering to guide you in installing winchester disk drives. When deciding how long to wait before turning a winchester disk drive on after it has been at a lower temperature, you should determine if and how long the drive was subjected to a thermal shock. A thermal shock of a drive happens whenever the thermal gradient of 59 degrees f /hr has been exceeded for any length of time. The Rule of Thumb for a shocked drive is to allow one hour at room temperature for each hour the drive was subjected to thermal shock. The thermal shocked drive should be allowed to readjust to temperature without any power applied. For example: Assume a drive is taken from an office at 75f and put into the trunk of a car at 10 f. The drive remains in the trunk for one hour. Since the difference in temperature is greater than 59 degrees f/hr, the wait time should be one hour to stabilize the unit. The power is then applied and an Additional Hour should be allowed before usage. ORIGINATOR: J WHALEN DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB016 Pg001 FIB 00017 11/24/89 *** PCBA Compatability with Single-Action-Lock HDAs *** SYMPTOM: Various - including Fail to come Ready, Seek Errors, Dropping Ready PROBLEM DETERMINATION: HDA has Single-Lever Carriage & Spindle Lock Mechanism FIX: Verify PCBA Compatability with table below and change PCBA if required. The PRIAM Part Numbers for Single-Action-Lock (SAL) HDAs are: DRIVE MODEL SAL HDA PART NUMBER ----------- ------------------- 3350-x0 330555 6650-x0 330556 15450-x0 331120 The following table lists the PCBAs and Microcode (EPROM or Microprocessor) part numbers and revision levels useable with Single-Action-Lock HDAs: PCBA ASSEMBLY # EPROM/uProc P/N EC Level --------------- --------------- -------- 2000088 Not Useable with SAL HDA 200098 300592 2318 200098-x1 300593 2298 200098-x2 300592 2318 200113 Not Useable with SAL HDA 200148-0x 300606 2366 200173-0x 300051 1846 200213-0x Not Useable with SAL HDA 200248-0x 300051 1846 200403-0x 300606 2366 200515-1 300254 1963 The problems caused by an incompatible combination will only occur when the HDA contains a magnet used to retain the carriage at the crash-stop. Since not all SAL HDAs contain this magnet, it is not necessary to replace the PCBA unless some symptom of the type described above exists. If it becomes necessary to replace an existing PCBA on an SAL HDA, DO NOT use those PCBA shown above as 'Not Useable with SAL HDA' even if the existing PCBA was of that type, since the problems induced can be highly intermittent. The Microcode for SAL compatability is also compatible with non-SAL HDAs, and will be available separately from USPS in the near future. ORIGINATOR: J. VanderHeyden DISK I/O-PRIAM-P120,P154,P33,P66--------------------FIB017 Pg001