MAI Basic Four 4399 Service Manual Download Page 196

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Summary of Contents for 4399

Page 1: ...Basic Four System S 10 Machine Type 4399 Office Display Terminal Machine Type 4398 Service Manual April 1983 BFISD 8072PA...

Page 2: ......

Page 3: ...n Checks AC Power Requirements Ground Checks Power Requirements Installing The S 10 0DT 2 1 2 1 2 1 2 2 2 2 2 3 Attaching And Detaching The Keyboard Serial Port Interface 2 5 2 6 2 9 Operational Funct...

Page 4: ...2 And The Floppy Disk Controller 3 13 AFC Timing Advanced Video Processor Circuit Description The Z80 l CPU 3 13 3 13 3 14 3 15 The Interrupt System And Timer The I O Ports Device Enable Signals 3 15...

Page 5: ...Adjustment 4 10 Track 00 End Stop Adjustment 4 10 Drive Belt Adjustment 4 11 Azimuth Alignment 4 11 Disk Drive Compliance Measurement 4 12 Disk Drive Erase Measurement 4 13 Disk Drive High Frequency P...

Page 6: ...gin Bell 4 45 Aut o Repeat And Scroll Rate 4 46 Screen Column Width Cur sor And Rese t 4 46 Saving Set Up Features 4 47 Screen Linearity And Focus Test 4 47 S 10 Memory EPROMs And Disk Drive Tests 4 4...

Page 7: ...d St epper Motor Head Carriage Assembly Spindle Bearings And Pulley Head Load Pad Assembl y Harness Assembly SPARE PARTS 5 25 FIXED DISK DRIVE Introduction General Description Functional Concept Equip...

Page 8: ...51 Disk Assembly Top Cover Removal And Replacement 7 52 Disk Controller Board Removal And Replacement 7 52 Power Supply Removal And Replacement 7 52 Disk Drive Assembly Removal And Replacement 7 55 M...

Page 9: ...rizontal Drive Signal 3 32 Cabinet Rear Lower Left Corner 4 4 Cabinet Cover Latch 4 4 5VDC Adjustment 4 6 Radial Track Alignment Patterns 4 8 Index To Data Alignment Pattern 4 9 E Test Pattern 4 15 St...

Page 10: ...uting and Fold 7 1 2 Interface PCBA and Bracket Mounting 7 1 3 Disk Drive Block Diagram 7 1 7 Surface and Head Geometry 7 1 7 Differential Read Data Line Driver 7 21 Differential Write Data Line Recei...

Page 11: ...Component Layout 6 15 Advanced Video Processor 16K Parts List 6 17 Advanced Video Processor 64K Parts List 6 23 Advanced Floppy Controller Parts List 6 29 S 10 Power Supply Parts List Phase lB 6 33 OD...

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Page 13: ...this manual are Section I Section II Section III Section IV Section v Section VI Section VII Section VIII Introduction Installation Functional Description Maintenance Removal Replacement Spare Parts...

Page 14: ...BFISD 8072 I I SYSTEM S 10 OFFICE DISPLAY TERMINAL 8072 01 Figure 1 1 System S 10 and Office Display Terminal x iv...

Page 15: ...400 1 3 SAFETY PRECAUTIONS As with any electronic equipment precautions consistent with all standard industrial safety practices must be taken while servicing the S 10 0DT The cabinet contains potenti...

Page 16: ...rvicing either the power supply or any area where power terminals are exposed 1 4 S 10 OVERVIEW The S 10 is a software based video display information station that combines state of the art hardware a...

Page 17: ...pmental needs 1 5 PHYSICAL DESCRIPTION 1 5 l Office Display Terminal ODT The ODT Terminal is designed to work interactively with a host computer using either ANSI standards or a specific personality o...

Page 18: ...or the additional circuits disk drives for program storage different configuration of the Advanced Processor AVP Board and a controller board for control and data handling of the disk drives a Advance...

Page 19: ...e unit is turned on it takes several seconds to load the instructions the unit needs to operate into main memory The keyboard screen and disk drives are all devices which exchange programs and data wi...

Page 20: ...ODE RAY TUBE CRT ADVANCED VIDEO P ROCESSOR BOARD NO l S 10 O NLY Figure 1 2 S 10 0DT Internal Components KEYBOARD CIRCUIT ASSEMBLY AND KEY MATRIX 8072 03 1 6 COVER PANEL SECURING PADS LATCH Figure 1 3...

Page 21: ...s used for these different purposes the unit keeps track of them automatically Figure 1 4 is a conceptual diagram of the S 10 It illustrates the flow of data among the various parts of the S 10 the pr...

Page 22: ...ODT S 10 ELECTRICAL Power Frequency OPERATING ENVIRONMENT Temperature GENERAL Display Keyboard Processors 1 8 20 0 inches 500 mm 22 0 inches 589 mm 11 75 inches 292 mm 30 lbs 13 6 Kg 40 lbs 18 2 Kg 1...

Page 23: ...Disk Drive S 10 Only 5 25 Inch Hard Disk S 10 Option Memory Two 5 1 4 inch floppy diskettes 622K bytes per diskette double sided 96 TPI 10 49 Megabytes 2 disks or 20 97 Megabytes 4 disks ODT Z80 with...

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Page 25: ...of damage and mishandling Any damage sustained during shi pment is the responsibility of the shipper Place the carton in an upright position and open it First lift out the keyboard then lift out the u...

Page 26: ...it breaker turned ON measure the drop between the green and white wires at the power source wall outlets The measured voltage must be less than 1 8 volts AC b Set the source circuit breaker to OFF Mea...

Page 27: ...from the shipping carton and place it on any convenient surface such as a desk table or stand Do not use a plush or spongy surface such as a typewriter pad which might restrict the airflow through the...

Page 28: ...is the leftmost connector on the lower righthand side of the terminal as viewed from the back see figure 2 2 The port requires a male 25 pin D connector which complies with EIA specification RS 232C 7...

Page 29: ...e hinge holes then pressing the hinge knobs until the pins are completely inserted into the hinges When not in use the keyboard may be raised and latched by turning the latch knob counterclockwise whi...

Page 30: ...S Clear To Send CTS Data Set Ready DSR Signal Ground SG Not Used 12VDC 12VDC Not Used Data Terminal Ready DTR Not Used 5VDC Not Used DESCRIPTION This is chassis ground and is not to be used for refere...

Page 31: ...data from auxiliary device Unit Origin asserted when power is ON unless the unit is in the Local Mode the FUNCTION TAB key is pressed or the DTR handshake Protocol is selected 6 Not Used 7 8 9 10 Sign...

Page 32: ...SIGNAL DESCRIPTION 11 14 Not Used 15 Transmit Clock TC Unit Origin 17 Receive Clock RC Unit Origin 16 18 Not Used 19 20 Clear To Send crS External Origin must be asserted when connected to send data o...

Page 33: ...iter keyboard laid out in a similar arrangement and some additional keys It is used to enter commands and data into memory Auxiliary Pad Group This group is laid out like a ten key adding machine keyp...

Page 34: ...aphs 2 10 SHI FT The SHIFT key on the S 10 functions like the shift key of a typewriter It generat es no print ing or nonprinting cha racters by i t sel f When pressed i t enables the uppercase func t...

Page 35: ...set up and control functions Several other keys are reserved for special features according to individual programs Refer to the particular software documentation for i nstructions 2 6 4 The Auxiliary...

Page 36: ...the keys indicate the direction of cursor movement Each depression of a key moves the cursor one character position in the direction indicated If the key is depressed and held down with the Auto Repea...

Page 37: ...ommas between the Escape key P for ANSI mode or the Escape key p for 7270 mode 3 Type an attribut e specifier Transmit only The key function is sent to the CPU or host computer and is not used as a te...

Page 38: ...nal keyboard Figure 2 4 illustrates the Int ernational keyboard Most functions of the International keyboard are the same as the earlier model Standard key board Additional keys and functions have bee...

Page 39: ...ys above the main key group are Programmahle Function keys and are often referenced by numerals from left to right PFl to PF16 However there are an additional 22 keys on the keyboard with other names...

Page 40: ...ly The key function i s sent to the CPU or host computer and is not used as a terminal control sequence Execute only The key function affects only the display memory or terminal functioning and is not...

Page 41: ...rbar II m 1 9 H p Motorbar III m 2 A I Q Motorbar IV m 3 B J R Main Key Cursor Escape Key q 8 G 0 Back Tab Tab q 9 H p Space Bar q A I Q Return Key q B J T Backspace Key q c K s Auxiliary Keypad Retur...

Page 42: ...fic sof tware literature for an explanation of those functions AUXILIARY KEYPAD The numeral keys the RETURN key and the TAB key functi on the same as their counterparts in the main key group when pres...

Page 43: ...ak signal 3 5 seconds FUNCTION and TAB Using these keys together transmits a short break signal 275 seconds FUNCTION and ENTER This combination transmits the answer back message CURSOR KEYPAD KEYS The...

Page 44: ...keys do the following Left Key This key clears the screen deleting displayed data You must press the FUNCTION key at the same time Right Key This key clears all bold characters from the screen To do t...

Page 45: ...serting a disk Disks should never be insert ed in the drives when the power is not on nor should the power be turned off when disks ar e in the drives Turning the power on and off with disks in the dr...

Page 46: ...this purpose Your office supply vendor can provide you with excellent filing and storage containers for your disks With proper care you can increase the life of your disks and avoid loss of data It i...

Page 47: ...tion Each box of disks provides a sheet of 3 4 inch foil stickers These are called write protect tapes and are used to prevent alteration of the contents of disks Disks that have been write protected...

Page 48: ...ed To boot the operating system hold down the FUNCTION key and press SYSTEM RESET the INSRT key The third type is a full reset which performs the functions of the first two resets and also reloads the...

Page 49: ...0 Sheets 2 1 through 2 3 The Reference Data also contains schematics for the Motherboard and Power Supply assemblies Technical and servicing information regarding the Video Electronics and CRT Display...

Page 50: ...r to perform other tasks This enhances the operating speed of the ter minal 3 2 1 Display Characters The font memory has 256 character positions comprising two completed 128 char acter fonts each char...

Page 51: ...There is no need for The 80 column display has 24 character lines of 12 rasters each with a 25th line for the status display When the 132 column display is selected 24 char acter lines of 12 rasters e...

Page 52: ...CHARACTER MODE FULL 12 SCANS NOT DISPLAYED NOT DISPLAYEO TOP SCAN INTERLINE SPACE DOTFOR i FULL CAPITAL HEIGHT LOWER CASE a o ETC HEIGHT UNDERSCORE DESCENDER DESCENDER t 0 2 3 4 5 6 7 8 9 INTERLINE S...

Page 53: ...ing by allowing the program t o adjust the number of raster scan lines fo r the first and last lines of a scrolling region The ras t er control field also permits shorter t han normal height display f...

Page 54: ...ll and a last dummy line for its EOL The start of the status line is transferred by the DMA to the Line Buffer using the 2 byte status address start first two bytes from the VDT which the DMA stored t...

Page 55: ...l and the DMA share memory cycles The DMA sequences through the RAM performing only refresh functions 3 2 7 The Double High Character Line Double high characters are displayed using two separate disp...

Page 56: ...e Advanced Floppy Controller circuit board is interrupted by the floppy disk controller whenever data is being written or read 3 2 10 System Clocks The system Master Clock generates the primary system...

Page 57: ...the disk is stor ed in RAH 2 The disk drives are double sided 96 TPI All drives use the MFM encoding method The data capacity of the disk for each version is given in the specification 3 3 1 The Disk...

Page 58: ...I __ _ I i __ i I n pL_I I i J 0 u w l _J _J _ 0 1 I _ I z I 0 u 0 0 0 0 l _J 0 w u z Cl i h l I 0 i 0 0 J V I j pt __ V I w u 0 A 0 0 x _ 0 w 0 f x ___ 0 f w z u z o I i I I 0 1 _ ii lJr l __L ii i i...

Page 59: ...e AVP assembly contains those circuits that are related to the terminal function such as the input and output ports the DMA and video processing master clock and Z80 l and the microprocessor controlle...

Page 60: ...correct sequence for the display 3 4 3 Line Buffer and Attribute Generator Data is stored in the Line Buffer then supplied to the Attribute Generator where the display characteristics ar determined su...

Page 61: ...s for reading data and precompensation during data writes RAM 2 has a capacity of 64K and stores data read from the active floppy disk which includes the CP M operating system and the application prog...

Page 62: ...e and SYCMD Synchronous Mode which selects ere or transmission clocks 23E for the DART 24F DZ0 DZ7 receives the output from the EPROM s when they are addressed by Z80 1 This data bus also goes to Page...

Page 63: ...high which gives the CTC priority 1 and the other system interrupts feed in via IEO The IEO IE l connections from the daisy chain from the 32 bit port counter 54 to the DART then the CTC A signal fro...

Page 64: ...th RD and IOREQ Input output request used in conjunction with B A C D CE and RD to transfer commands and data to and from Z80 l Receiver clock selected from MUX 23E When SYCMU from decoder OE is high...

Page 65: ...hain comprises five LS163 counters formed into a multistage counting scheme The first counter outputs the basic Z80 l clock The Ql output from l E half of is the clock for the keyboard port 19F The vi...

Page 66: ...see Schematic Sheet 3 9B is a counter loaded with the display character during byte 1 refer to 3 2 4 for details from Data Bus RO R3 It is loaded by SCCE and held by VB dur ing the video blanking int...

Page 67: ...erall intensity control to the output transistors Q4 Q5 giving eight levels of intensity Video on and off control is effected via CR9 half intensity through CR8 3 6 9 Character Generation The output o...

Page 68: ...is low are available at RAM 1 as A0 A7 PP and FE push and pop the stack These signals together with the SO Sl con trols are generated by ROM 27A which in turn is driven by 30A sequencer On increments...

Page 69: ...he MSB of 29B pin 7 recycled to maintain its status The output of 30B goes to 29B and is clocked through with MQ and ZCY by F 2 which ensures that all of these signals are synchronized MQ becomes MREQ...

Page 70: ...Advanced Floppy Con troller assembly This assembly is installed only in the S 10 Schematics for this assembly are shown in Section VIII Schematic 051300 sheets 1 through 3 3 7 1 AFC Timing The timing...

Page 71: ...B2 AB4 from Z80 2 are decoded into CTC external clock timer triggers and into the read and write enables for the disk drive controller Similar signals from Z80 l on the A0 A7 bus perform symmetrical f...

Page 72: ...rom the controller Write data comes from 16A pin 9 which obtains its inputs from 17B pin 31 WDAT pin 17 EARLY and pin 18 LATE When register lSB pin 10 is l ow precompensation is enabled This data s te...

Page 73: ...ording d Data reading 3 9 1 Head Positioning Control The head positioning circuit is comprised of a four phase stepper motor pulley band combination for converting rotational to linear motion The pull...

Page 74: ...00 sensor comprises a l ight source LED and a phototransistor positioned on either side of a shut ter mounted on the head carriage assembly The output of this phot o detector connects to a conditi oni...

Page 75: ...sistor through a conditioning cirucit gener ates a low true logic level on the INDEX interface line The position of the phototransistor is adjustable 3 9 5 Head Load Mechanism The head load mechanism...

Page 76: ...tapped write read winding where the current reversal is accomplished by steering the current through one or the other of the two halves of the winding Figure 3 7 shows the basic recording technique Th...

Page 77: ...s operation was writing 1 millisecond must be allowed after termination of WRITE GATE to allow for erase and circuit settling time Figure 3 8 shows wave forms in the read sequence The head generates a...

Page 78: ...ize and geometry The display is operated from a standard 1 2 volt D C supply Input and output connections for the displays are made through a 10 pin edge connector on the main circuit board Provision...

Page 79: ...VERTICAL DRIVE VERTICAL OSCILLATOR CIRCUITRY SYS GNO SYSTEM GROUND SYSTEM I l GND l A__NOT CONNECTED HORIZ 4 1 DRIVE 2 HIGH HORIZONTAL OSCILLATOR CIRCUITRY 3 4 LOW TO EXTERNAL BRIGHT WIPER VIDEO OUTPU...

Page 80: ...thode of the CRT 3 10 2 Horizontal Driver The horizontal drive signal input at pin 6 must be TTL compatible and a series of positive going pulses of approximately 4 40 usec duration see figure 3 10 In...

Page 81: ...or transistor Q401 The 600V and the 60V are applied across the brightness pot R207 In addition these voltages provide enough range to allow the blanking pulses to turn off the CRT beam during re trace...

Page 82: ...physical size and appearance and use the same circuit board The S 10 supply has additional components installed Schematics for the Power Supplies are included in Section VIII Reference Data The 5V DC...

Page 83: ...0001 to XX 9999 O DT Phase lA Model 4308 Serial Numbers XX 0001 t o XX 9999 Note XX repr esents 2 alphabeti cal charac t er s that changed mont hl y Phase lB Har dwar e al so call ed New Styl e Phase...

Page 84: ...r or a mild commercial cleaner wipe the cabinet exterior with a damp sponge or soft rag 3 Using an ammonia based glass cleaner and a soft rag or paper towels clean the face of the CRT 4 Using a non me...

Page 85: ...binet 9 Inspect the wiring harness for broken or stressed wires Pay partic ular attention to the edge connectors on the two boards the power supply and the video assembly Repair or replace the wiring...

Page 86: ...8072 19 KEYBOARD CABLE CONNECTOR I t POWER CORD CONNECTOR Figure 4 1 Cabinet Rear Lower Left Corner NEW STYLE LATCH CLOSED POSITION OLD STYLE LATCH OPEN POSITION Figure 4 2 Cabinet Cover Latch inside...

Page 87: ...ure 4 3 The m eter should indicate be tween S O volts to S 03 volts DC There is no minus tolerance on this adjustment 3 If the 5 VDC level is out of tolerance adjust the resistor on the Power Supply a...

Page 88: ...BFISD 8072 AFC BOARD AVP BOARD 5V TEST POINTS LOCATION 5V DC ADJUSTMENT LOCATION 8072 20 Figure 4 3 SVDC Adjustment...

Page 89: ...n to track 00 2 Insert a CE alignment diskette DYSAN P N 802020 MM 529030 and close the door 3 Sync oscilloscope on leading edge of signal on TP6 output of 4F 14 Connect oscilloscope probes to TPl and...

Page 90: ...BFISD 8072 LEFT 70 OF RIGHT EQUAL AMPLITUD E RIGHT 70 OF LEFT 8072 21 Figure 4 4 Radial Track Alignment Patterns I 0...

Page 91: ...ivision 3 The index sensor mounting screws are located at the bottom of the drive in the recessed area Loosen the two screws and slide the sensor such that the oscilloscope picture shows a data patter...

Page 92: ...volts minimum 7 Tighten the sensor mounting screws 4 5 1 4 Speed Control Adjustment To adjust the speed control perform the fol lowing steps in the order listed 1 Apply power to the disk drive and se...

Page 93: ...ve motor mount ing screws bottom of chassis Adjust drive motor so that the tension on one leg of the drive belt is 17 1 grams A tensio meter may be used to make this measurement Tighten the drive moto...

Page 94: ...o position the heads to track 32 Head 0 GET D 32 32 A To position the heads to track 32 Head 1 GET D 32 32 16 A 4 5 1 8 Disk Drive Compliance Measurement To measure compliance perform the following st...

Page 95: ...t tom head or 6A pin 1 Model 92 top head 6 Step back and forth across track 64 for about 15 seconds 7 At the end of the 15 second period remove jumper installed i n s t ep 5 above return head s to tra...

Page 96: ...struction manual 1 Turn on the S 10 and set it to Local mode 2 Set the screen for normal video and clear it of any data Function Home and Function EP 3 Press and hold CONTROL and press Up Arr ow repea...

Page 97: ...play for the maximum definition of these characters 10 Adjust TlO l HORIZONTAL OSCILLATOR COIL on the Video assembly to center the test pattern on the scr een Ensure t hat no foldback occur s at the l...

Page 98: ...Isolate the faulty function or area 5 Go to the troubleshooting table refer to table 4 1 and find the symptoms to further isolate the fault to an assembly Due to the integral nature of the hardware an...

Page 99: ...scope the clock that is in question b DMA and memory circuits Schematic page 5 The DMA is the most difficult circuit to diagnose This in part because the memory has to be working and in part because...

Page 100: ...per information from the data bus and to decode it and prepare it for presentation on the screen The decoded information determines where it will appear on the screen what video attributes will be use...

Page 101: ...cte r s In most units the font i s downline l oadable The fonts are stored in a pair of 24 pin memory IC s These memories are pin com patable with 2716 EPROMS and if the downline loadable feature is n...

Page 102: ...h I O Ports Schematic page 1 The I O Ports ar e microprocessor con trolled The circuitry is complex in the way it operates but it i s not complex to trouble shoot The majority of field problems are du...

Page 103: ...g trains of pulses that can tell the user a considerable amount about the condition of the circuit The only way to fully understand the patterns is to observe them one or two at a time The test proced...

Page 104: ...e The next step after the screen is correct is to test the two I O ports The port near est the corner of the board is the main port the other is the aux iliary port The best way to test the ports is t...

Page 105: ...PF7 Performs a reset SCROL UP Raise screen intensity SCROL DOWN Lower screen intensity PAGE LEFT 80 character font PAGE RIGHT 132 character font PF8 Set s up the NVR test after PF7 is set PFl PF2 PF3...

Page 106: ...ts are enabled the following will occur a RAM is allowed to come up and start operating properly b CTCl and the DART are set up c CTC2 which is on the floppy controller board is disabled d Data for th...

Page 107: ...y depressing the scroll up and down keys This forces a new value to be output to the video inten sity control port c 80 and 132 column mode may be switched by depressing the page back for 80 and the p...

Page 108: ...otal reset within the diagnostic and bring command back to the main screen k PF8 does a hard reset which will perform the same initialization as a power on reset 1 After the execution of any of the ab...

Page 109: ...PU and floppy con troller portions of the AFC to not work The first step is to check the RAS and CAS lines These have to be working fo r the memory to operate The memory is addressed in part by a PROM...

Page 110: ...with an AVP in the processor slot Apply power and with an oscilloscope verify that SELO and SELl are switching approximately once per second 2 Power down the test fixture and connect the two floppy d...

Page 111: ...lected Bad speaker Broken wire Advanced Video Processor CORRECTIVE ACTION Check outlet power cord replace cord if necessary Replace the fuse find out why it blew Check input output replace filter if r...

Page 112: ...R Video board Power supply Video board Video board CORRECTIVE ACTION Reseat circuit assemblies Reset the unit Power off power on Try another disk Check the disk drive Check all cables Release HOLD key...

Page 113: ...d 112 Controller Board Defective fan CORRECTIVE ACTION Adjust intensity pot Set from keyboard and SAVE in NVR as required Adjust focus pot Replace video board refer to paragraph 5 3 Set to correct bau...

Page 114: ...interface Video board not adjusted CORRECTIVE ACTION Check all connections Replace board 112 refer to paragraph 5 1 Replace disk drive refer to paragraph 5 10 Check all connections Load a system disk...

Page 115: ...owing symptoms pertain to the CRT Video Amplifier circuit board and power supply Video Generator Module or Video Board or Power Supply or any com bination of the above Deflec tion coil Check voltage f...

Page 116: ...are hooked up An open or high resistance indicates a defec tive deflector coil Replace Ql04 and with power off and yellow and red wires dis connected check continuity between the points that the yell...

Page 117: ...ph steps which include possible causes and suggested fixes Tabl e 4 2 Disk Drive Trouble Symptoms TOPI C PARAGRAPH Preliminary Troubleshooting Steps Drive Won t Step or Steps Errati cally Head Carriag...

Page 118: ...am figure 4 7 2 In order to step the following circuit points must be at the levels indicated a Counter 3C pins 7 and 10 must be low b Counter 3C pin 9 must be high 3 If signals measured are as shown...

Page 119: ...B FISD 8072 Jl 18 J l 20 3C 14 L 3C 13 VOL TAGE O F PH ASE SIGNAL S L OW 0 3V HIGH 12V J4 12 Rll Jl 26 8072 25 Figure 4 7 St epper Motor Cont rol Timi ng...

Page 120: ...solenoid 2 Doubl e check shunt lG for pr oper programming 4 6 8 6 Bad I ndex Output 1 Block index LED l ight path If 14 B is a low level replace i ndex l oad boss assembly 2 Remove diskette and close...

Page 121: ...ks 1 Verify that head is loaded by visually checking t hat head l oad pad or upper head on Hodel 92 cont ac t s diskette If head is not l oaded refer to par agraph 4 6 8 5 2 Check compliance refer t o...

Page 122: ..._5v J I I v 2__ __ _6v_t_1v_ I I I 1 t TD _ _ 9V 1v 1K71 7 ___ I I I 11 1 I I I I TF LTR TD 5V O 5V I I I I I TWI 1 1 I I I TWl J 1 I I 2 5 MIN TW Figure 4 9 Read Timing 2 3 5 0mV 230 750mV 650 2250mV...

Page 123: ...a alignment refer to paragraph 4 5 1 2 4 6 8 13 Cannot Write Data 1 Check WRITE PROTECT output refer to paragraph 4 6 8 7 2 Check HOO WRITE or HDl WRITE if top head on Model 92 for low level 3 Check P...

Page 124: ...Jl 24 1 L n Jl 22 2E 8 r 1 l 20 11 r i I J3 l 2 2V 0 2V J3 2 2 2V 0 2V SB 13 58 12 6A 3 h ll__ _J 430us 20 L I I 850us 20 I _ T e ON 1 I l Te OFF 1 I ti I I I SV tr I O 4V 8072 28 Fi gure 4 10 Write...

Page 125: ...locations These tests are normally run auto matically at power up or whenever FUNCTION and RESET are pressed together To start the tests on the terminal manually proceed as follows a Press FUNCTION an...

Page 126: ...FUNCTION M To test the video attributes for the terminal proceed as follows 1 Press FUNCTION LINE LOCAL or FUNCTION REMOTE LOCAL for the Local Mode 2 Press ESCAPE 5m HP compatible ESCAPE dA for blinki...

Page 127: ...2 Press the TAB key several times The cursor will advance incremen tally to each tabstop set 3 Press FUNCTION CLEAR ALL TABS then press TAB again The cursor will advance to column 80 or 132 if set 4...

Page 128: ...OWN The dis played text will scroll incrementally or smoothly depending on the mode set 4 Press FUNCTION SCROLL RATE one time and repeat step 3 twice to check the toggle action between the other two s...

Page 129: ...TION CONTROL S when testing S 10 system 4 7 S Screen Linearity and Focus Test These units contain a built in pattern generator for checking and adjusting the display presentation This generator fills...

Page 130: ...ed all memories are cleared and the operating system is loaded from the diskette to the computer RAM This is a process which requires that all parts of the system function together When the unit is ru...

Page 131: ...occur in NVR ROM and Read Write memory a character will appear In all cases the ROM and RAM memories referred to here are those on the Advanced Video Processor board See the Troubleshooting Chart for...

Page 132: ...Terminal Refer to paragraph 4 7 2 for the test procedures 4 7 8 S 10 Key Function Tests Procedures for checking the operation of the tabstops status keyclick margin bell auto repeat screen and saving...

Page 133: ...fault condition is indicated go to the test in step 2 b Identifying a faulty Port To identify a faulty I O port proceed as follows 1 Connect a terminal or host computer to the port 2 Press PFS 3 Ente...

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Page 135: ...ent connected to the unit 3 Lower the keyboard and rotate the cabinet cover latch fully clock wise 4 Using a flat non metal tool such as a plastic letter opener open the top cover 5 The faulty board m...

Page 136: ...verse order of steps 2 through 4 6 Turn the unit ON 7 Connect a DVM across the test point on the AVP board for 5VDC and ground see figure 4 3 8 Set the adjustment on the Power Supply to between 5 00 a...

Page 137: ...WARNING Hazardous voltages are exposed in the cabinet Use extreme caution when servicing any area where power terminals are exposed 5 Unplug the CRT connector from the CRT neck see figure 5 2 WARNING...

Page 138: ...8072 29 8072 30 5 4 HORIZONTAL YOKE CONNECTOR llliii I CRT GROUNDING CLIP 9 VERTICAL YOKE CONNECTOR _ VERTICAL CRT CIRCUIT ASSEMBLY Figure 5 1 Video Electronics Assembly Figure 5 2 CRT Connector SIZE...

Page 139: ...o ground before unclipping the high voltage lead 1 Turn the unit OFF 2 Pinch the high voltage lead anode clip perpendicular to the lead see figure 5 3 to remove it from the CRT 3 Remove connector with...

Page 140: ...d to the line filter 6 Disconnect the wires to the keyboard cable jack 7 Remove the assembly 8 Install the replacement assembly in the reverse order of steps 2 through 7 9 Reconnect the power cable an...

Page 141: ...ws securing the primary power connector and switch assembly see figure 2 1 and cut the cable harness tie wraps if necessary 8 Secure the unit on its side and remove the four screws that secure the cha...

Page 142: ...tighten the CRT frame lug screws until the last one is in place 5 8 KEYBOARD REPLACEMENT The keyboard consists of the keyboard cabinet the keyboard assembly a Field Replaceable Unit and a 5 VDC regula...

Page 143: ...e the two screws securing the hinges to the keyboard cabinet and install the replacement hinges Right Cabinet Hinge 3 S 10 only remove the disk drive assembly as described in paragraph 5 11 4 Remove t...

Page 144: ...troller board 9 Return the unit to normal operation 5 11 DISK DRIVE REPLACEMENT S 10 ONLY To replace a malfunctioning disk drive proceed as follows i 1 1 Trun the unit OFF and remove all external cabl...

Page 145: ...FISD 8072 0 9 i G 111111111111 11111111111 I I IIIIIIII 1111111111111111111111 9 111111111111 8072 33 Figure 5 5 Drive Securing Screws S 10 Only 8072 34 Figure 5 6 Front Panel Securing Screws S 10 Onl...

Page 146: ...t the plastic tie that fastens the fan to the drive unit and unplug the fan cable To install a new fan reverse the above procedure 5 13 DISK DRIVE ASSEMBLY S 10 ONLY The following material gives seque...

Page 147: ...BFISD 8072 8072 35 Figure 5 7 Disk Drive Top View...

Page 148: ...BFISD 8072 8072 36 Figure 5 8 Disk Drive Bottom View 5 14...

Page 149: ...vity LED Cone Assembly Carrier Assembly Index Load Boss Assembly Solenoid Drive Motor Track 00 Sensor Door Button Assembly 91 92 only Stepper Band Stepper Motor Head Carriage Assembly Spindle Bearings...

Page 150: ...Drive motor speed Drive belt Compliance PARAGRAPH 4 5 1 1 4 5 1 3 4 5 1 5 4 5 1 9 4 5 1 1 4 5 1 3 4 5 1 2 4 5 1 2 4 5 1 4 4 5 1 2 4 5 1 4 4 5 1 6 4 5 1 9 5 13 1 Printed Circuit Board Assembly PCBA To...

Page 151: ...rite protect sensor is an integral part of the right hand guide To remove this assembly proceed as follows 1 Remove the PCBA refer to paragraph 5 13 1 2 Remove screws 2 holding guide to the disk frame...

Page 152: ...rm the preceding steps 1 through 4 in the reverse order 5 13 5 Front Panel Bezel and Activity LED To replace the activity indicator i t is necessary to remove the bezel To remove the bezel proceed as...

Page 153: ...ess ring until it is flush against bezel 4 Fit female connector over LED leads with green wire connected to longest LED lead 5 Install bezel to drive chassis and guide assemblies refer to paragraph 5...

Page 154: ...ng carrier to drive chassis mounting posts 5 Cut tie wraps holding index LED wires to carrier 6 Remove index LED female connector 7 915 925 Only Remove screws 2 attaching bezel to RH LH guides and loo...

Page 155: ...wires to the carrier assembly at front and rear 9 Perform any adjustment called out in table 5 2 5 13 11 Index Load BOSS To remove the index load boss assembly proceed as follows 1 Remove PCBA refer...

Page 156: ...w free Be careful not to lift solenoid load arm straight up so that it bends upper arm assembly pas t its normal unloaded position screw 1 6 Tilt solenoid and l ift to the side and up out of the drive...

Page 157: ...tor wires into wire harness 4 After installing belt refer to table 5 2 for adjustment references NOTE Do not tighten screws in motor mount until belt is adjusted 5 13 14 Track 00 Sensor To remove the...

Page 158: ...as follows See figure 5 10 1 Remove bezel refer to paragraph 5 13 5 2 Remove bezel bracket mounting screw 3 Remove retention ring from one end of rod 4 Slide rod from assembly be sure to catch spring...

Page 159: ...n the band slip one head end through the slot in the band 3 Wrap the band around the pulley 4 Lay band flat against head carriage assembly install screw washers and band mounting clip in rear of head...

Page 160: ...Loosen front band mounting screw 3 Remove screw mounting band to pulley BAND CARRIAGE MOUNTI NG C LIP 4 Cut t ie wraps enclosing stepper mot or wires in wire harness 5 Remove two screws on bottom of...

Page 161: ...rod by prying from front and sliding guide rod out the rear of the chassis 8 Lift head carriage assembly off the right hand guide rod and out of drive chassis 9 Be careful of banging and bending uppe...

Page 162: ...as sembly in Model 91 drives proceed as follows 1 Remove PCBA refer to paragraph 5 13 1 2 Remove shield refer to paragraph 5 13 2 3 Manually position head carriage assembly all the way to the rear of...

Page 163: ...his frees the head connector s and PCBA connectors P4 l P4 2 and P4 3 2 Remove connections from a Bezel activity LED b Right hand guide write protect sensor two connections c Index load boss sensor d...

Page 164: ......

Page 165: ...Video Monitor Circuit Assembly Flyback Transformer Floppy Disk Drive Assembly Figures 6 1 thru 6 3 and tables 6 1 thru 6 3 are illustrated parts lists for the ODT and System S 10 Figure 6 4 in conjun...

Page 166: ...BFISD 8072 Figure 6 1 ODT S 10 Keyboard and Cabinet Assembly 6 2...

Page 167: ...EMBLY LATCH ARM COVER LOCKING PLATE CAM KNOB TOP LOCKING BARREL LOCK BOLT LOCK PLUG SCREWDRIVER POWER CORD SWITCH ASSEMBLY MOTHERBOARD FIELD REPLACEABLE MOTHERBOARD FIELD REPLACEABLE FLYBACK TRANSFORM...

Page 168: ...REPLACEABLE ODT PHASE II ONLY ADVANCED VIDEO PROCESSOR PCBA 64K TT520051 051950 FIELD REPLACEABLE S 10 PHASE II ONLY 1 20 SPEAKER 130001 1 21 VIDEO MONITOR BOARD FIELD REPLACE TT520130 190038 ABLE 1...

Page 169: ...807 2 67 Fi gure 6 2 I r I I I I I I I I ODT S 10 CRT Assembly BFISD 8072 6 5...

Page 170: ...NO DESCRIPTION DESIGNATION PART NO 2 1 CRT 12 VOLT KOS ASSEMBLY TT527010 081305 PHASE lB AND PHASE II 2 2 CHASSIS TOP 2 3 CHASSIS SIDE LEFT 060401 CHASSIS SIDE RIGHT 060400 2 4 CHASSIS BRACKET SUPPOR...

Page 171: ...8072 68 Figure 6 3 S 10 Disk Drive Assembly j I _ BFISD 8072 5 7...

Page 172: ...MBLY 33 min DISK DRIVE ASSEMBLY 0 min COVER DISK DRIVE REAR SHIELD COVER DISK DRIVE TOP BRACKET DISK DRIVE RIGHT BRACKET DISK DRIVE BOTTOM MOTOR COOLING FAN BLADE FAN CABLE ASSEMBLY DISK DRIVE POWER C...

Page 173: ...BFISD 80l2 View Exploded u 6 4 Disk Drive Figure 6 9...

Page 174: ...8 001 PCB Assembly Shunt Spindle Drive Motor Assembly Stepper Motor Assembly Stepper Band Head Load Solenoid Assembl y Track 00 Assembly Shield Assembly Rt Hand Guide Write Protect Assy Lt Hand Guide...

Page 175: ...8 001 1 78501 001 1 78503 001 1 75000 150 1 77000 223 1 77002 151 1 77002 472 1 79000 103 1 79001 503 1 78001 151 1 78001 561 1 78001 331 DESCRIPTION IC 74L 510 IC 74L514 IC 74LS33 IC 74LS74 IC 74LS86...

Page 176: ...BFISD 8072 TPS 10 30 Figure 6 5 Disk Drive PCBA 6 12 I _ __Jr Component Layout i _ _Jr...

Page 177: ...5B 6E 74LS123 1 76000 123 28 NE592 1 76007 592 2D 74LS86 1 76000 086 2E 74LS74 1 76000 074 2F JD JG 74LS14 1 76000 014 2G 3E 7438 1 76001 038 JC 74LS169 1 76000 169 4C 74LS10 1 76000 010 4F LM339 1 7...

Page 178: ...BFISD 8072 Pl TPS 10 31 6 14 ORIENTATION OF ADJUSTMENT SCREW UI Cl C2 Figure 6 6 Disk Drive Ready PCHA Compone nt LRyout...

Page 179: ...R PART NUMBfR DESCRIPTION 1 2 28013 003 PCB Ready Loqic 2 1 76000 123 I C 74LS123 3 _77003 103 RESISTOR 10K 1 4 w SO O 4 1 77003 563 RESISTOR S6K 1 4 w 50 0 s 1 79001 503 POTENTIOMETER SOV 6 1 74014 1...

Page 180: ...u 20 21 22 23 2 25 26 27 21 29 o o8 o 8o o8 o o o g o o n o 0 o om cr o u JJ i lo c tl CO 1 0 Q IT8 8 C Cl ij j ij ij n a M a 1 MWW o B J 0 o j 8 o 0 1 0 1 0 0 1 0 1 c 51 t2 23 2 6 27 Q 1 En La 6 o e...

Page 181: ...0 6 152262 CAP 22MF GUMDROP ELEC 15V C62 C72 C73 C74 C75 C77 YY010756 2 153310 CAP 330 PF 50V C83 C84 YY010800 1 154700 CAP 47 PF 50V C71 YY010779 2 230001 IC R1LS95 Q7 OCTL BUFF 21 0 26E YY010780 5 2...

Page 182: ...I C 74LS174 HEX D FLIP FLOP 18 38 21 E YY003597 8 32374 I C 74LS374 OCT D FLI P FLOP 28 148 198 9D 19D 10E 27E 28E YY000041 q 233000 IC 74SOO QUAD2 NP NG 3A 5A 17A 228 24B 9c 4D 10 HiF YY003044 3 233...

Page 183: ...298 9E YY0078 37 1 271000 R 10 OHM si 1 4 W R13 YY000127 16 271030 R 10K OHM 5i 1 4 W CC R4 R25 R27 R31 R33 THRU R35 R38 R39 R40 R43 R45 R46 R49 R50 R51 YY010749 2 27 1032 R NETWORK 10K SI P RN1 RN 2...

Page 184: ...1 283645 T PNP 2N3645 07 YY000767 6 283904 T 2N3904 01 THRU 06 YY000187 6 284454 DIODE 1N4454 CR1 THRU CR5 CR8 YY010943 1 28474 5 DIODE ZENER 1N4745 16V CR6 YY00281 9 1 284746 DIODE ZENER 1N4746 18V C...

Page 185: ...10 CAP 330 PF 50V C83 YY011307 1 230002 IC 825 1A MOS UART 19F YY005931 1 23001 1 IC Z80A MICRO PROC CPU 12E YY01 0906 1 230012 IC 2055 64X8 MNOS RO M 30E YY011319 1 230026 IC Z80A DART 24F YY005930 1...

Page 186: ...a o o o om o o _ o0ll o c n I 0 0 0 0 0 0 0 0 oI n n M i ni i 0 El M ti I 2300 J u Li J J J J J J uD 1 a 6 nta n nCJ n IT 7 9 10 OJ u O o u u 00m Mn IS Du I tt rW i a0 _ p 12 aQ J s s o 11 o wH 11 o...

Page 187: ...0800 6 15226 CAP 22MF GUMDROP ELEC 15V C62 C72 C73 C74 C75 C77 YY010756 2 1533 10 CAP no PF f V C83 C84 YY010800 1 151noo CAP 47 PF 50V C71 YY010779 2 23000 1 IC R1LSq5 97 OCTL AUFF 21D 26E YY0107RO...

Page 188: ...32174 I C 74LS17 4 HEX D FLI P F LOP 1B 38 21E YY003597 8 232374 IC 74LS37 4 OCT D FLIP FLOP 28 148 19B 9D 19D 10E 27E 28E YY000041 9 233000 IC 74500 QUA D2 INP NG 3A 5A 17A 228 248 9C 4D 70 YY003044...

Page 189: ...FLOP 13A 298 9E YY007837 1 27 1000 R 10 OHM 5i 1 4 W R13 YY000 127 16 271030 R l OK OHM Si 1 4 W CC R4 R25 R27 R31 R33 THRU R1S R38 R39 R40 R43 R4 5 R46 R49 R50 R51 YY010749 2 271012 R NETW ORK l OK...

Page 190: ...50 1 28 3645 T PNP 2N3645 Q7 YY000767 6 283904 T 2N3904 Q1 THRU Q6 YY000187 6 284 454 DIODE 1N 4454 CR1 THRU CR5 CR8 YY010943 1 284745 DIODE ZENER 1N4745 16V CR6 YY0028 19 1 284741 DIODE ZENER 1N4746...

Page 191: ...C AVP CPM ROM CNTRL 74S288 17F YY01 1306 1 012490 IC AVP BOOT 2764A 1llE YY01 1307 1 230002 IC 825 1A MOS UART 19F YY005931 1 23001 1 IC Z80A MICRO PROC CPU 12E YY010906 1 2300 12 IC 2055 64X8 MNOS RO...

Page 192: ...BFISD 8072 8072 72 Figure 6 9 6 28 C EI 7il E m CEJ E ccm mm o I QIO t lff c c LE J E Sa e c mtJ aaio S Z lC c atJ SCE c i 5CID u Advanced Floppy Disk Controller Circuit Board Assembly Diagram AFC...

Page 193: ...2 C4 4 C51 C52 C57 C56 C59 C32 THRU C40 YY010798 1 152200 CAP 22 PF 50V C6 1 YY010799 2 152210 CAP 220 PF 50V C60 C62 YY010800 4 152262 CAP 22MF GUMDROP ELEC 15V C41 C43 C45 C58 YY006794 2 153311 CAP...

Page 194: ...1 8 3 TO 8 DCDR MUX 160 17C YY005908 1 232 163 IC 74LS 163 4BIT BIN CTR 15A YY010935 1 232165 I C 74LS165 PAR 8BIT SHT RG 16A YY000446 1 232 1711 IC 74LS174 HEX D FLIP FLOP 158 YY002611 1 232221 IC 74...

Page 195: ...08 R 200K OHM 1i 1 4W M FL R26 YY011314 3 270009 R 1 5K OHM 1 1 4W CC R30 R31 R13 YY011 335 1 270012 R 220 330 OHM NETW ORK 19A YY007837 1 2700 13 R 51K OHM 1 1 4W M F R1 6 YY007852 6 271 000 R 10 OHM...

Page 196: ...NUMBER DESCRIPTION LOCATION YY005931 1 2300 11 IC Z80 MICRO PROC CPU 9C YY010962 1 230021 IC FD1763 802 TR DAT 8UF 178 YY011317 8 230024 IC 16 X 1 RAM M5K4164ANS 5E THRU 12E YY005930 2 230029 IC Z80A...

Page 197: ...AR FILM R105 YY000118 RES 220 OHMS 1 4W 5S CAR FILM R107 YY005721 POT 2K Rios R127 YY000117 RES 150 OHMS 1 4W5S CAR FILM R109 R110 R112 YY000062 RES 100 OHMS 1 4W 5j CAR FILM R113 R114 R117 R118 R119...

Page 198: ...123 YY01 1410 CAP 330MF 16V ALUM ELECT C105 C109 YYOl 1411 CAP 1000MF 10V ALUM ELECT C106 C107 C108 Cl24 YY011412 CAP 0047MF 3KV DISC CER C110 YY011413 CAP 100MF 200V A LUM ELECT C111 C112 C114 YY0114...

Page 199: ...Y004802 DIODE HR851 D109 D116 YY005760 DIODE 1K4936 D110 YY011415 DIODE 1N988 D112 D113 YY000352 DIODE 1N914 D114 D115 YY005789 IC V RG 7905 A101 YY000461 SCR C122F A102 YY002618 TRANS 4N25 OPTO A103...

Page 200: ...00062 RES 100 OHMS 1 4W 5J CAR FILM R113 R114 R117 R118 07 YY000119 RES 300 OHMS 1 4W 5J CAR FILM R119 08 YY000117 RES 150 OHMS 1 4W5J CAR FILM R109 R110 R112 09 YY011407 RES 1 OHM 1 4W5J CAR FILM R12...

Page 201: ...11110 CAP 330MF 16V ALUM ELECT C105 C109 22 YYOl 11111 CAP 1000MF lOV ALUM ELECT C106 C107 23 YY011412 CAP 0047MF 3KV DISC CER C110 24 YY011413 CAP 100MF 200V ALUM ELECT C111 C112 C113 C114 25 YY01131...

Page 202: ...0 DIODE 1N4004 D105 D106 D108 D111 37 YY004802 DIODE HR851 D109 38 YY005760 DIODE 1N4936 D110 39 YY011415 DIODE 1N9A8 D112 D113 40 YY000352 DIOD E 1N914 0114 41 YY011444 INDUCTOR 155 5601 L101 L103 42...

Page 203: ...187 Table 6 12 Mother board Parts List TT520040 P N 051131 Phase lB DE CRIPTION VPN QTY LOCATION RES 470 OHMS 1 2W 5S 274711 R1 RES 910 OHMS 1 4W 5S 279110 1 R2 TRANS 2N3645 PNP 283645 1 Q1 TRANS 2N 3...

Page 204: ......

Page 205: ...TENANCE contains corrective maintenance procedures 7 5 REMOVAL and REPLACEMENT PROCEDURES describes sequence and step by step procedure in removing major subassemblies 7 6 PARTS LIST 7 1 1 General Des...

Page 206: ...l 1 n 0 s O 0 p Cl I rt L 0 1 rt 0 I 00 0 I N I 0 TOP COVER HEAD DRIVE HOUSING REAR VIEW REAR FACIA HEAD DRIVE ASSEMBLY J3 DRIVE DATA MASTER ELECTRONICS PCBA f J4 __ J2 Jl DRIVE CONTROL Pl POWER CONT...

Page 207: ...re into the drive chamber lower chamber and to return via a recirculating filter DC Motor and Brake The de motor is a brushless two phase external rotor m otor with integral hub and commutation effect...

Page 208: ...wer Supply and input to the drive on connector J3 7 1 2 Functional Concept The simplified block diagram i n figure 7 3 shows the functional concept of the disk drive Additional detailed explanations o...

Page 209: ...d write heads in the proper sequence at a rate and direction determined by a microprocessor Index Logic The square wave output of the Hall sensor in the de motor is processed to produce a pulse every...

Page 210: ...s time Average latency Average data access time ramp mode Average data access time 3 milliseconds step mode Head switching time 10 Megabyte 20 Megabyte 256 32 8192 10 49 256 32 8192 20 97 8900 bpi inn...

Page 211: ...idity 5 90 RH no condensation Hum idity Gradient 20 per hour Altitude 1000 to 40 000 ft Vibration 0 2 in pk to pk di splacement 5 Hz to 20 Hz Shock Withstand drop of 36 inches RF Interference 1 in 106...

Page 212: ...rive inspect the packaged drive to determine whether any damage has been incurred during shipment 7 8 1 Using the shipping documents verify that all items have been received 2 Open protective shipping...

Page 213: ...y the micr oprocessor and one is selected by removing Link A on the master electronics board Link A in step rate 10 microseconds to 200 microseconds Link B in step rate 700 microseconds to 3 1 millise...

Page 214: ...pare 34 33 Spare 36 35 BUSY 38 37 ACK 40 39 RST 42 41 MSG 44 43 SEL 46 45 C D 48 47 REQ 50 49 I O Cable Routing and I nterface Connection Cable routing and connection of the interface board should be...

Page 215: ...ure the clamp bracket in place 7 Insert the unshielded side of the flat ribbon cable through the AUX port hole in the cabinet When inserting the ribbon cable ensure that the red strip side of the cabl...

Page 216: ...ET STU D SIDE VIEW O U TSIDE REAR VIEW 8072 44 Fi gure 7 5 Cabl e Cl amp Bracket Ins t allation BENDA ROU ND E N DOF AVP ANDA FC CIRCIUT FOLD FLAT B O A RD ___ INTERF A C E BOARD CON NECTOR R ED STRIP...

Page 217: ...2 Reinstall the ADVANCED VIDEO Processor PCBA and Advanced Floppy Controller PCBA Refer to paragraph 5 2 Replace all cables re moved in number 3 13 Connect the other end of ribbon cable to the Disk Dr...

Page 218: ...er On Procedures The Disk Drive requires 12 volts and 5 volts de source power and these voltages are measured at drive connector J3 At power on the drive motor takes 4 amperes at 12 volts dropping to...

Page 219: ...0 from track 0 detector Motor speed exceeds 1 tolerance during normal operation Motor speed exceeds 10 5 toler ance during normal operation Flag 0 always true Step pulse while Write Gate true Static w...

Page 220: ...nnel with a compr ehensive understanding of the functions of the dri ve A brief discussion of disk recording principles is followed by a functional description of the disk drive unit explaining how th...

Page 221: ...REK LETt TllACK ODO MASTEll lLfCTllONICS INDEX INDEK HD WlllTE FAULT OlllVE SELECT DlllVE 5lLECT HE O SELECT OlllVE SELECTED r IUVE SELECTED OClllOTOll IMDEX EEO TllACKClll CONTllOL TIIACI ODO lll OY...

Page 222: ...n the outer track portion of t he disk resulting in less air pressure on the inner tr ack than on the outer track The slider is mounted to the head arm assembly via a spring gimbal mount This allows t...

Page 223: ...d Select 2 lines Table 7 5 is a head select matrix showing the logic level required on each Head Select line to select the desired read write head Table 7 5 Head Select Decode Matrix LINE HDO HD HD2 H...

Page 224: ...ost system Precompensation early and late of wri t e data is used fo r certain data patterns The following paragraphs describe the read write data as well as the Drive Selected signal 7 0 MFM Read Dat...

Page 225: ...BFISD 8072 AM26LS31 GAD 8072 49 Figure 7 10 Differential Read Data Line Driver 1oon 7 GAD 8072 50 Figure 7 11 Differential Write Data Line Receiver...

Page 226: ...BFISD 8072 DRIVE SELECT HEAD SELECT MFJ4 READ DATA WRITE GATE sr r e MFM JlJl WRITE DATA _J t 7 _ 8072 51 Figure 7 12 Read Write Timing...

Page 227: ...ta 1000 Early Clock 1001 On Time Clock 1010 On Time Data 1011 Early Data 1100 1101 1110 Late Data 1111 On Time Data 7 3 4 Disk Controller The controller is contained on a single printed circuit board...

Page 228: ...FM RECDMPENSATION RIGHT MOST BIT IS WRITTEN FIRST ON TIME CLOCK LATE CLOCK TIME DATA EARLY DATA LATE DATA ON TIME DATA Figure 7 13 Write Data Precompensation EARLY CLOCK ON TIME CLOCK ON TIME DATA EAR...

Page 229: ...internal data bus to serial data for transfer to a selected disk drive It converts serial data fr om the selected disk drive to parallel dat a which i t places on the i nternal data bus Data Separato...

Page 230: ...appended The line C D command data has a dual purpose the slash indicates quality The dash after the C indicates that when this line is at a low level command mode is indicated and when it is at a hi...

Page 231: ...e controller receives command from the host adapter High High High The controller receives data from the host adapter Low High High The controller sends data to the host adapter Low Low High The contr...

Page 232: ...ith SEL the host adapter must also send an address bit to select the controller DBO for controller The con troller must not be busy The host adapter must deacti vate SEL before the end of the current...

Page 233: ...ng diagram in figure 7 15 shows the basic timing requirements Upon receiving both the SEL signal and DBO the controller activates the BUSY signal As shown in the timing diagram both SEL and DBO must b...

Page 234: ...on the data bus by the host must be stable within 250 nanoseconds after the ACK signal is activated The command byte must be held stable until REQ is deactivated The host deactivates ACK after REQ goe...

Page 235: ...y errors occurred during the execution of the command The second is a zero byte It signals to the host that the command is complete Figure 7 16 shows the data bus REQ and ACK timing See table 7 7 for...

Page 236: ...Tandon drives Buffer step option for drives made by Computer Memories Inc and Rotating Memories Inc 200 microsecond pulse per step Bit 3 5 Spare Set to zero for future use Bit 6 Bit 7 If one during a...

Page 237: ...d O or 1 Last Status Byte 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 Set to zero Figure 7 19 Completion Status Bytes count 1 Logical Address High Middle and Low The logical address of the drive is computed by u...

Page 238: ...0 0 0 Byte 1 0 0 d I I I I I Byte 2 I I I I I I I I Byte 3 I I I I I I I I Byte 4 I I I I I I I I Byte 5 I I I I I I I I Recalibrate Class 0 Opcode 01 This command positions the read write R W arm to...

Page 239: ...to the track in error Tables 7 12 through 7 15 that follows the formats l ist the error codes d drive 0 or 1 BIT Byte 0 Byte 1 Byte 2 Byte 3 B yte 4 Byte 5 BIT Byte 0 Bits 0 3 Bits 4 5 Bit 6 Bit 7 7 6...

Page 240: ...N 0 ID Read Error The controller detected an ECC error in the target ID field on the disk 1 Data Error The controller detected an uncorrectable ECC error in the target sector during a read operation 2...

Page 241: ...ned as the result of the Request Sense Status command NOTE The address valid bit bit 7 may or may not be set and is not included here for clarity ERROR Table 7 15 Request Sense Status Error Codes CODE...

Page 242: ...High Address Byte 2 Middle Address Byte 3 Low Address Byte 4 0 0 0 Byte 5 r 0 0 0 Interleave 1 to 31 for 256 sectors 1 to 16 for 512 sectors Interleave 0 s s 0 0 s Check Track Format Class 0 Opcode 0...

Page 243: ...dress Byte 2 Middle Address Byt e 3 Low Address Byte 4 0 0 0 Byte 5 r 0 0 0 Interleave 1 t o 31 for 256 sectors 1 to 16 for 512 sectors Interleave 0 s s 0 0 s Format Bad Track Class 0 Opcode 07 This c...

Page 244: ...ddress Byte 4 Block Count Byte 5 r a 0 0 0 s s s Reserved Class 0 Opcode 09 This opcode is not used Write Class 0 Opcode OA This command writes the specified number of sectors starting with the initia...

Page 245: ...del number After the host sends the command DCB to the controller it then sends an eight byte block of data that contains the drive parameters Some of the parameters occupy two bytes all two byte para...

Page 246: ...101 0100 after the correction However if the host has set the maximum ECC burst length at 4 bits the controller would have to flag this data as uncorrectable This is a type 1 code 1 error Command Byte...

Page 247: ...2 1 0 Byte 0 0 0 0 0 1 1 0 1 Byte 1 I I I I I I I I Byte 2 I I I I I I I I Byte 3 I I I I I I I I Byte 4 I I I I I I I I Byte 5 I I I I I I I I RAM Diagnostic Class 7 Opcode 00 This command performs...

Page 248: ...6 5 4 3 2 1 0 Byte 0 1 1 1 0 0 0 1 1 Byt e 1 0 0 d I I I I I Byte 2 I I I I I I I I Byte 3 I I I I I I I I Byte 4 I I I I I I I I Byt e 5 r 0 0 0 0 s s s Control ler Internal Diagnostics Class 7 Opco...

Page 249: ...1 0 Byte 0 1 1 1 0 0 1 0 1 Byte 1 0 0 d High Address Byte 2 Middle Address Byte 3 Low Address Byte 4 Block Count Byte 5 r 0 0 0 0 s s s Write Long Cl ass 7 Opcode 06 This command transfers a sector o...

Page 250: ...ap SYNCl 1 ID Sync Byte GAP2 2 ID Zero Byte Gap COM 1 ID Compare Byte CYLH 1 Cylinder High MSB CYLL 1 Cylinder Low LSB HEAD 1 Head Number SEC 1 Sect or Number FLAG 1 Flag Byte ZER 1 Zero Byte ECCl 4 I...

Page 251: ...or sys tem usage When a fault occurs an appropriate error code is displayed in the fault indicators Table 7 1 7 lists the description of these tests and the applicable error code The Power On LED is u...

Page 252: ...played check is successfully completed Write The microprocessor then begins the re track 00 Two possible fault codes may false within 25 steps toward the center of displayed After going false if Flag...

Page 253: ...code 4 will be display ed The processor will not allow a step pulse to be received while Write Gate is true This is considered to be a catastrophic controller fault The drive returns to Write Gate st...

Page 254: ...failure No 12V supply Faulty de motor Hall el ement Faulty motor speed board Controller Interface fault Faulty master board Faulty master board Faulty preamp board SV and or 12V t oo low Faulty microp...

Page 255: ...rent switching circuits 7 5 Removal and Replacement Procedures The following paragraphs detail the removal and replacement procedures for the major subassemblies Be sure to read each procedure before...

Page 256: ...ive Control and J3 Drive Data See figure 7 21 B 3 Using a flat object screwdriver or letter opener depress the locking tabs on the four mounting studs and remove controller board See figure 7 22 4 To...

Page 257: ...0 Ill CD a 0 00 0 N I vi vi HEAD DRIVE HOUSING POWER SUPPLY TOP COVER REAR VIEW REAR FACIA HEAD DRIVE A SSEMBLY MOTOR CONTROL PCBA J3 DRIVE DATA MASTER ELECTRONICS PCBA t J4 _ IC J2 Jl DRIVE CONTRO L...

Page 258: ...BFISD 8072 8072 56 al c t l z V LL I uu Oc J _ 0 V Vl LL I c 0 0 LL I C 1 I I J I Figure 7 22 Controller PCBA Removal I...

Page 259: ...top mounting bracket two 2 mounting screws of the Drive Assembl y is to be replaced 7 To replace the Drive Assembly reverse the above procedure 7 5 5 Master Electronic Board Removal and Replacement 1...

Page 260: ...l I z c I cc z u c 0 E J c u c 0 x V l Vl a LU 3 0 c I I 0 I LU z 0 0 LU z a 0 0 a a I c I 0 z J a cc LU I 0 3 a z a 0 LU I c J 0 z J E 0 0 u a I u c z 0 0 x I u V l c 0 8072 57 Figure 7 23 Head Driv...

Page 261: ...l C1 CJ Pol CJ CJ l s r T r a 00 0 N I Jl 00 PZ TOl 11 1 0fTING IAACKET SID E MOU NTING RAIL BOTTO MM O UNTIN G PL A TE rACIA PS S TAND orr i d l GROUHDfN G COftN C Tl0N P6 J4 C ASTING STAR W SHERED4...

Page 262: ...ge between the motor rotor and the brake pad and push the brake body so that the plunger is fully depressed against its spring 8 Ensure that the center line of the brake lines up with the motor center...

Page 263: ...t and tighten the left standoff 7 Reconnect stepper motor connector J8 de motor connector J9 and brake connector J6 ensuring correct polarization of the connectors 8 Insert the screw securing the left...

Page 264: ...AB l RTN 0 t 911 RIO 0 0 5 I H V PV 4 1 i __r 1 815 0 R IS cco cco P5 6 P8 I I HAL I R12 020 A1J e20 rLiN K l 911 I f 1 12 J HAL 121 I Lr 1 I 1n I 1 I le i P5 IS C14 C15 CIJ T1 T0 lp l 1 to 5112 P5JS...

Page 265: ...1 R IO H 22 H 14 r J R14 I l2 LO r Al 8 l lc 21C 17VFIL _ 1 AO f IL AS k l R 121 Cl1 5 1 5K1 J__l I L 0 ONO C18 V J 0 01JI SY T A Ol 1 1 J r SHT3 OIF 11 A53 AOP c c21 lf Jt LMJ30 J 330p O l A50 1C3 2...

Page 266: ...1 0 at 10 10 _ o lj l l __ dq _ 010 c J LGC L n 15 lll N l GNO AU t t I_ _ t l i 1411 GI r R1J 1 1 8 20 11V ll r ir l ll oc _ _ _ _ 17 1 J5t 1_ 16 lf oc r sv 1519 J J c J cJO r c J J 1 ll V1 t7V c 1 5...

Page 267: ...fulj I SJ U IO I OC t LGC GNO 17 1 1 2 8 34 1 1 H P l JO l 1 Cl2l C33 iflo SHT 1 SHT I WTl IA lf J 1 I I o 01 01 IJ SHH AIO 11 A oor r 1118 L nn G 1 SUICCOMl fTf _ _ n _ Cl II _ 0 19 7 lS144 RfN 8 14...

Page 268: ...soc PJ C l rt l 1 4 I a I I I I a en g IC12 I n _ 3 PJ rt t n I f r I soe I r3 e I SQQ 3 ti JS I 2 12 1 C g 7 g i g 0 Hl I I 5 I a I I a _ I COMMON I I 7400 2K7 PiNV VA LENT TO N 1K2 PH fsea 1nuLN200...

Page 269: ...8072 64 Motor Sp d ee Control PCB Layout BFISD 807Z r 1 0 0 7 65...

Page 270: ...BFISD 8072 r 8072 65 Master PCB Layout 7 66...

Page 271: ...d System S 10 Advanced Video Processor Schematic S 10 ODT Advanced Floppy Disk Controller Schematic Power Suppl y Schematic S 10 onl y Power Supply Schematic ODT only System S 10 Wiring Diagram Disk D...

Page 272: ...MRQ l 21 ZC7CO CTC 1 JDU A IQ fi t 251 rEY IN r Advanced Video Processor Circ uit Diagram AVP 1 of 5 b Y 11 41 b E ON 2 Pl t o j en 0 00 0 i...

Page 273: ...telW8 01 0 cillO I I SE J YI_ 8 1 c Zlfllf i cc R h ACT lj 0 bD ti E BTE orec1 f P1 20 lG 0 15 lb3 IE e111 EIO n el 47 1 10 0 I l A TO Sf AC Ell F ld z 1 3 Advanced Video Processor Circuit Diagram AV...

Page 274: ...01U ZJ4Uo FQJ 1111 I I I X5 F I I I I fl SO c Sl 39 SB j _ ax n 5E 1Jce WD ISCS LOF TO A r30 llCl4 FT ZD llC15 FTlO I ll NCHIV I 1 1 A I I qQ eca D 1 v 11 IDQO a i s UIJOUJ 49 IDllJ QVIO 1 11 fl 13CI...

Page 275: ...BFISD 8072 Ii s ll ti ti Ill t J v i g i l N y I 0 g a 00 113 4 A 4 J 4 1 0 4 u d 0 ell ell II 0 0 p 0 II O i 4 E U II g t i 113 O I t 8 5...

Page 276: ...co I I CJ ADZA A DZ9 fl AOZ8 AOZ3 AOZZ OZ1 rl 1 oz OZ3 oz2 I I I 11 Z OZJ 1 I I I I I cj ti l Zj t i en t OJ 5 _t _ I 0 8 t Advanced Video Processor Circuit Diagram AVP 5 of 5...

Page 277: ...Jl i AZ Cleili 3 R f s _ 01 v 3 OCIJ JT Ra 2 4 1 2 410 J Dl J 4 oour 44 4S2 1 4 Sl 3 Q 2 OllJ 5G CCIUT 14 J os i z c J e cx or t4 I 9 I c 9c I z 14 I AS Oii z l e OltiJ 1 oour I i M 03 06 o t Q 2 cour...

Page 278: ...IZ c 2 13 I B I 1 4 I A I L5t X 1ic 3 I nr4 07 II a CD z Tml OS I 2CI 2 01 T2 G t 03 ce1 i oz DC 03 5 IO c ec TI 63 DI __ _ 02 14C Q _ c eo 0 Of DI GI E 004 llD en CSI 1 Q4 C C l B eli Dl o 14L 10 Q3...

Page 279: ...I D SV uzi SV CA9 A P1 4SSlP1 a 3 0 1 oe D l l I VI oZ S I r TJc c J 7 c Advanced Floppy Disk Controller Circuit Diagram 3 of 3 Dii5C Qt J s Qz Ji QEil W l i az z ciOi QEID QEil txl z l 1 4 en t i 00...

Page 280: ...l 12 A hJ J I Q IOS 0110 0106 0112 0 Il l 7 Rt19 AH 01U c110 r l 102 0101 r t f r r r T 5 VCX T oto 0109 tOOO ICV Ct05 C t09 uo t UOt ll03 Atoe j l UQ JU C 104 n IOJ uo a1 t _________ ___ AIU r R11 0...

Page 281: ...1t QIOS 1 v 119 C HS DUO r u C it oon oooY om OIOl I 1 r I lt02 l rY t __ r il S Yot TI e1oe Ct07 Ct01 RIOa 0 102 Atl3 1ll 112At03 HOO 1ft l O t t t O UH I U 118 Q 6 t tOt I 2 YOUS 09 RIOS Dt O 14 12...

Page 282: ...en _ 0 I l 1 s Q t i Ill l Q l 1 Ill s I l D 0 VI 0 D Pl p IV f PZ I ovn I I h 111 1 lll L l J L LJ L J L J 1 1 _ ZT 8 ZLOS QSI R...

Page 283: ...co I w WllUl 1 tJtO t ll orr I o y 0 t IOOf lll I c S 10 Disk Drive Schematic 1 of 3 c 1 O J UI p I I I I I l I I nt o txi rj H en t I CX 0 N...

Page 284: ...BFISD 8072 o 1 1 0 _ f N a i CJ i i 111 i a 41 c CJ ti 41 i it I i C 0 ti l I _ a l l t i f t Ill I I i I I I I I i j 8 14...

Page 285: ...SY t SV R3 C 2 SbK 15 Pf sv 1 1 J 6 17 IO J QJS OE OY PS 6 2 I I I UI cj 3 S sv PS 8 INDEX 6ND SV S 10 Disk Drive Schematic 3 of 3 P5 9 l 3L 1 5 PS I H en t 00 0 N...

Page 286: ...nds an XOFF DC3 to the S 10 when its receive buffer is nearly full This signal causes the S 10 to stop transmitting characters When most of the characters in the printer s receive buffer have been pri...

Page 287: ...ceived will control the S lO s output stream Used to transmit serially encoded data When no data is being transmitted this pin is held in the mark state Not used Asserted while the S 10 is powered on...

Page 288: ...I3 OD er 45 2D 77 4D M I09 6D m I 4 OE sp 46 2E 78 4E N 110 6E n IS OF so 47 2F I 79 4F 0 11 I 6F 0 I6 IO dle 48 30 0 80 50 p 112 70 p I7 11 dcl XON 49 3I I 8I SI Q 113 7I q I8 I2 dc2 so 32 2 82 S2 R...

Page 289: ...d can move swap copy or delete as a unit BOOT To load the operating system into main memory BUFFER Zone between temporary storage and permanent storage CENTER To place a line or block of text an equal...

Page 290: ...e Ct by deletion substitution insertion or re arrange ment ENTER To introduce data into the system usually by pressing the Return key EMULATION Process whereby one terminal takes on the personality of...

Page 291: ...able on the screen usually upper left hand corner ID The name you enter usually your given narae to gain access to the proce ssor INPUT To enter information into a system INSERT To place data from a f...

Page 292: ...aces with new text OVERPRINT At printout allows you to overstrike two lines of text that appear separately on the screen OWNER Author or originator of a docum ent PAGE CALL Allows you to display any p...

Page 293: ...nds SCROLL To adjust the screen image vertically or horizontally to bring data beyond screen boundaries into view SCROLLING REGION The part of the screen which can be scrolled while other parts remain...

Page 294: ......

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