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Содержание 067-0892-00

Страница 1: ...TEK INSTRUCTION PartNo 070 2827 01 MANUAL Product Group 64 MicroLab 067 0892 00 01 02 03 04 Instruction Manual Tektronix IOIRCLLENGR...

Страница 2: ...070 2827 01 MANUAL Product Group 61 MicroLab 067 0892 00 01 02 03 04 Instruction Manual Please check for change information at the rear of this manual First Printing DEC 1983 Tekt ry kronix Revised A...

Страница 3: ...es are covered by U S and foreign patents and or pending patents TEKTRONIX TEK SCOPE MOBILE and et are regis tered trademarks of Tektronix Inc TELEQUIPMENT is a registered trademark of Tektronix U K L...

Страница 4: ...r componentona circuit board WARNING The second half of the manualexplains the internal workings of the MicroLab and contains servicing instructions that are for use by qualified personnel only Don t...

Страница 5: ...0000000 5 4 Keypad Definitions 22 SPO Gi aeaaee ae 12 Volt Supply introduction a eecee totePeoe pepe Reco dey eeECO SESS BA eae Zz Communications 5 5 Using the MicroLab Cassette ane Storage System 26...

Страница 6: ...ECTION 10 REPLACEABLE MECHANICAL PARTSLIST SECTION 11 PERSONALITY CARD SERVICE REV A JUN 1980 Table of Contents MicroLab Instruction ILLUSTRATIONS Fig No Page The TEKTRONIX MicroLab 000eeceeeeeee vi 1...

Страница 7: ...inal ZA ATIENTION refer to manual Grounding the Product This product is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired r...

Страница 8: ...ower On Dangerous voltages exist at several points in this product To avoid personal injury do not touch exposed connections and components while power is on Disconnect power before removing protectiv...

Страница 9: ...MicroLab Instruction 2827 1 The TEKTRONIX MicroLab I vi REV A JUN 1980...

Страница 10: ...r proper operation There are also tests contained in the MicroLab operating system that are designed to excercise the Emulator Processor andits probe Demonstration The MicroLab acts like a prototype c...

Страница 11: ...ocessor s data address and control lines Memory The MicroLab contains 4K x 8 bit RAM This RAM can be reconfigured into a 2K x 16 bit format for use with 16 bit personality cards In both the 2K and 4K...

Страница 12: ...us This bus carries the address data and control information between thetwo circuit boards For example if a key is depressed on the MicroLab I keypad the keypad display encoder converts the key press...

Страница 13: ...The MicroLab doesn t have an assembler so all code must be entered in hexadecimal notation The MicroLab facilitates entry of hex code by doing a lot of housekeeping chores as we ll see next Code Entr...

Страница 14: ...s the LOAD ADDRESS key and enter 3110 Location 3110 should contain OF the hexadecimal sum of the five numbers entered This ends the demonstration of the MicroLab We haven t used all the facilities ava...

Страница 15: ...s has been entered with the LOAD ADDRESS key the INC key can be used to increment the address to the next location you might wantto change with the LOAD DATA key Simply increment to the address you wa...

Страница 16: ...pace such as the addressspaceallocated to the system monitor The block will be relocated in 1K address increments For example you can t relocate the RAM to 3FFF but you can relocate it to 4000 If an o...

Страница 17: ...r about three seconds and then begin dumping the contents of the specified address range onto tape As each byteis written the address and data are shown on the display When thelast addressis written t...

Страница 18: ...ssette Recorderin Section 4 of this manual for information Storing Files If you re storing files on a new tape besureto position the tape so that recording doesn tstart on the leader If the file is to...

Страница 19: ...the MicroLab will stop loading the tape If this occurs press the SHIFT keyto get out of the tape load mode Operator Familiarization MicroLab Instruction Programming F1 F8 Eight of the MicroLabl s hex...

Страница 20: ...want The use of a PROM inthis situation does not prevent you from programming the key vector table directly as outlined before Those capabilities still exist The PROM just speedsthe process If you try...

Страница 21: ...ion MicroLab Instruction See the Motorola Microcomputer Data Library for more information concerning the operation of the 6850 ACIA The Terminal Port Connector The following is a list of terminal port...

Страница 22: ...ctions to delay 7 milliseconds if necessary 3 Read I O address XXX2 4 Testfor bit 7 high This indicates that a key has been pressed If bit 7 is low loop back and read the address again 5 Read the key...

Страница 23: ...s NOTE If you try to enter an addressthatis not a multiple of 1K the MicroLab monitor will automatically re position the RAM to the next lower segment As an exercise press the following keys 1 SHIFT R...

Страница 24: ...he cassette port input and output Starting the Self Test To startthe self test function press SH FT SELF TEST The display will show Sn Sn indicates that the MicroLab wants to know which ofthe eighttes...

Страница 25: ...e code means Operator Familiarization MicroLab Instruction EO An attemptto write to the memory location specified has failed This error might be encountered when using either the LOAD DATA or AUTO fun...

Страница 26: ...y or whatever functions may prove useful The expansion connector is connected to the address data and control lines of the microprocessor or microcomputer used in a specific personality card The lines...

Страница 27: ...s manual Items listed in the Supplemental Information column may notbe verified in this manual they are either explanatory notes or performance characteristics for which no limits are specified ELECTR...

Страница 28: ...C to 85 C 79 F to 185 F Altitude Operating 4 500 m 15 000 ft maximum Storage 15 000 m 50 000 ft maximum Humidity Operating 80 relative max non condensing Storage 80 relative max non condensing PHYSIC...

Страница 29: ...is devoted to the operator familiarization part of the personality card Instruction Manual supplements shipped with your personality card The supplements can bedividedinto two parts The operator s inf...

Страница 30: ...RE FOR USE BY QUALIFIED PERSONNEL ONLY TO AVOID PERSONAL INJURY DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO REFER TO OPERATORS SA...

Страница 31: ...from power sources where both current carrying conductors are isolated or above ground potential such as phase to phase on a multiphase system or across the legs of a 100 220 volt single phase three...

Страница 32: ...to place To remove personality card perform the following steps 1 Make sure that primary power tothe MicroLab is OFF 2 Swing theplastic dust cover upward until it rests in the vertical position 4 2 3...

Страница 33: ...e Recorder Thelid of the MicroLab contains two cables that terminate in audio plugs Connect one cable to the OUT jack on the MicroLab I and the other cable to the IN jack Connect the free end of the O...

Страница 34: ...mentfor that personality card Insert the service portion of each Per sonality Card Supplementin Section 11 at the rear of this manual Overview The MicroLab with a personality card installed can be div...

Страница 35: ...Logic Terminal RS 232 C Interface MODEM RS 232 C Interface Cassette Interface Keypad Display Logic Keypad MicroLab 2827 12 Fig 5 2 MicroLab Block Diagram The MicroLab is dividedinto three major operat...

Страница 36: ...ble ONBIO Display RAM Theory of Operation MicroLab Instruction To the microprocessor the display logic exists as an 1 0 address So the microprocessor places the O address of the display on the address...

Страница 37: ...create a voltage comparator Notice that the base of Q27 is connected to a 3 volt zener diode This zener regulates the amountof current flowing through Q27 Q28 on the other hand is biased by a resisto...

Страница 38: ...o the DO D7lines Theory of Operation MicroLab Instruction Address Flow In the top left corner of schematic 1 you can see the address bus coming from the personality card Address lines AO A9 are buffer...

Страница 39: ...ent happens when the upper 2K iswritten to When writing to the upper 2K the personality card forces the BR W line low and presents the address on BAO BA9 Next the personality card presents the data on...

Страница 40: ...pattern stored in breakpoint circuitry Address Latch ONBDIO _BSPO BSP6 Exclusive OR Theory of Operation MicroLab Instruction These two types of breakpoints can also be used to qualify one another A br...

Страница 41: ...indicates an internal I O operation by forcing ONBDIO low the address at BAO BA2 is enabled into U6010 Depending on the states of BAO BA2 oneofthefive outputs of U6010 will go low These outputs contro...

Страница 42: ...ogic is connected tofive of the SP outputs from the Exclusive OR Comparators If SPO SP4 from the comparators are low the output of U6080A goes high indicating a match Now look at U6080B You can seetha...

Страница 43: ...all a low would exist at output pin 8 of U2022C That lowis passedonto pin 13 of U3O80D Pin 6 of U6080B ishigh so another low exists at input pin 12 of U3O080D These two lows are combined to create a...

Страница 44: ...terminal When CTSis received U9020beginsto transmit the data in serial form from BDO BD7 to J101 U9020 automatically adds any parity or stop bits when transmitting data and checks for parity and stop...

Страница 45: ...seconds When a 2400 Hz signal is received the pulse is produced about every 208 microseconds The low going pulse output at pin 8 of U1050C does two things the pulse is turned into data by U1040 and th...

Страница 46: ...0A and U1040B As you can see U1040A and B are set up much like the Cassette Modulator J K pair Notice that the set input of U1040B is connected back to the Y3 output of U1030 We ll discuss this connec...

Страница 47: ...words to U5010 Four more 1 bit words are provided by U3020 so that U6020 and U3020 together feed four 5 bit words to U5010 The same thing happens with U5020 and U4020 The data stored in Display RAM i...

Страница 48: ...other words SO and S1 provide the read addresses for the Display RAM RX RX Enable Theory of Operation MicroLab Instruction Display RAM The Display RAM is read enabled by a third output of U3010 called...

Страница 49: ...on the keypad forcing the KB line low This low has clocked U2012 until its pin 6 output went high allowing the next pulse from KB to force the KEYSTROBE line high KEYSTROBE latched the value of the k...

Страница 50: ...n be generated on the Main Interconnect board keypad interrupt serial 1 O port interrupt etc all come together at the Interrupt Gating Theory of Operation MicroLab Instruction logic All the interruptl...

Страница 51: ...clear plastic cover and turn the MicroLab over on its top as shownin Fig 6 1 2 Removethe six screws shown in Fig 6 1 with a long tipped Phillips screwdriver 3 Carefully hold the top and bottom parts o...

Страница 52: ...the six screws shownsin Fig 62 Cassette Port cables and the fan power lines are also connected to the Main Interconnect board Use the following procedure when removing the Main Interconnect board 3 S...

Страница 53: ...move the screw holding the bottom of each guide rail 3 Setaside the guide rails 4 Removethe twoscrewsatthefrontof the high voltage protective cover and set the cover aside To reassemble the MicroLab r...

Страница 54: ...rocedure when removing thal Kevosd Display board Unless you are careful when removing the front 1 Set the cabineton its top as shown in Fig 6 4 panel and Keypad Display board the key caps will fall fr...

Страница 55: ...er for you to properly perform this procedure the MicroLab power supply must be connected to the 12 Volt 12 Volt 5 Volt Adjust Adjust Adjust Calibration MicroLab Instruction Main Interconnect board Co...

Страница 56: ...ble power supply and repeat steps 9 10 and 11 Do not adjust the 12 volt regulator at this time 16 Turn off the variable power supply and reset the HIGH LOW switch to HIGH 17 Reset the variable power s...

Страница 57: ...ge Use a soldering iron that has a connection to earth ground Use a special anti static suction type desoldering tool such as the Silverstat Soldapulit or a wick type desoldering aid Reducing eecepani...

Страница 58: ...g the damaged part otherwise the damage may be repeated 7 2 Troubleshooting Your Tektronix Service Support Center is best suited to perform repairs on this unit However the following general troublesh...

Страница 59: ...NG A AND B CASE CAPACITANCE AND VOLTAGE COLOR CODE 1733 2312 15 Fig 7 1 Tantalum Capacitor Color Code Diode Code The cathode of each glass encased diode is indicated by a stripe a series of stripes or...

Страница 60: ...an Tektronix Inc please check the Replaceable Electrical Parts list for the proper value rating tolerance and description It is best to duplicate the original compo nentasclosely as possible Parts ori...

Страница 61: ...it number Read Resistor 1234 of Assembly 23 Assembly number Exampleb component number A23A2R1234 A23 A2_ 1234 Assembly Subassembly Circuit number number number Read Resistor 1234 of Subassembly 2 of A...

Страница 62: ...CTOR CORP 2900 SEMICONDUCTOR DR SANTA CLARA CA 95051 32997 BOURNS INC TRIMPOT PRODUCTS DIV 1200 COLUMBIA AVE RIVERSIDE CA 92507 34335 ADVANCED MICRO DEVICES 901 THOMPSON PL SUNNYVALE CA 94086 34649 IN...

Страница 63: ...50V 04222 MA205E104MAA ASC5031 281 0775 00 CAP FXD CER DI 0 1UF 20 50V 04222 MA205E104MAA ASC5051 281 0775 00 CAP FXD CER DI 0 1UF 20 50V 04222 MA205E104MAA ASC5071 281 0775 00 CAP FXD CER DI 0 1UF 20...

Страница 64: ...0R 101 272 ASR6061 307 0650 00 RES NTWK FXD FI 9 2 7K OHM 5 0 150W 32997 4310R 101 272 A5R6062 307 0650 00 RES NTWK FXD FI 9 2 7K OHM 5 0 150W 32997 4310R 101 272 ASR6081 307 0502 00 RES NTWK FXD FI 9...

Страница 65: ...0724 02 MICROCIRCUIT DI HEX INV W OC OUT BURN IN 01295 SN74LS05 A5U4090 156 0382 02 MICROCIRCUIT DI QUAD 2 INP NAND GATE 01295 SN74LS00 A5U5010 160 0223 00 MICROCIRCUIT DI 256 BIT PROM W 3 STATE 8000...

Страница 66: ...LATOR 04713 MC7905CT A5U9010 156 0878 01 MICROCIRCUIT DI QUAD LINE RCVR SCRN 80009 156 0878 01 A5U9020 156 1206 00 MICROCIRCUIT DI N CHANNEL 04713 MC68B50P OR L A5U9030 156 0865 02 MICROCIRCUIT DI OCT...

Страница 67: ...0 RES FXD CMPSN 1K OHM 5 0 25W 01121 CB1025 A15R2085 315 0102 00 RES FXD CMPSN 1K OHM 5 0 25W 01121 CB1025 A15R4079 315 0182 00 RES FXD CMPSN 1 8K OHM 5 0 25W 01121 CB1825 A15R5066 315 0182 00 RES FXD...

Страница 68: ...65 SEC 71400 AGC3 A20F76 1 9 0013 00 FUSE CARTRIDGE 3AG 6A 125V 7 SEC 71400 MTH6 A20F85 159 0015 00 FUSE CARTRIDGE 3AG 3A 250V 0 65 SEC 71400 AGC 3 A20F89 159 0022 00 FUSE CARTRIDGE 3AG 1A 250V FAST B...

Страница 69: ...A20R56 315 0751 00 RES FXD CMPSN 750 OHM 5 0 25W 01121 CB7515 A20R57 315 0102 00 RES FXD CMPSN 1K OHM 5 0 25W 01121 CB1025 A20R58 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 A20R62 311 1559...

Страница 70: ...152 0535 00 FL100 119 0389 00 FILTER RAD INTE 115 230V 3A 02777 F11935 3 J103 136 0094 00 JACK TELEPHONE MINIATURE SHUNT TYPE 80009 136 0094 00 J104 136 0094 00 JACK TELEPHONE MINIATURE SHUNT TYPE 800...

Страница 71: ...X xx Tektronix Part No component NuMBER EXAMPLE for circuit boards The information and special symbols below may appear in this manual 14 15 1966 Drafting Practices Y14 2 1973 Line Conventions and Let...

Страница 72: ...8O J8098 COMPONENT NUMBER EXAMPLE ivso99 SEE cg909 SNOILV901 LNANOdWOO LOSNNODYSLNI NIVW 2827 26 Static Sensitive Devices See Maintenance Section A5 Main Interconnect Board A Subassembly Number used o...

Страница 73: ...IM5610 16 8 74LS86 14 a MC1488 14 7 74LS109 16 8 MC1489 14 7 TABLE 9 2 BUS BUFFERS DIAGRAM i PARTIAL A5 ASSY a Gee eee scen eee RO Mae CSACHT CG apoet eATO Sea Siete com ewer Seyi eee ee ie ae cee Pr...

Страница 74: ...lr eolon Sv oe ev ev 1 av Az As aS AS ae Ar Au Az Ais Ais eoopr RIO5Z ape Bo Bbe Bos Boe BOS Be Bor Da a Dz DS o4 os De D7 B o aJolulpful hh P O 3010 7 RESET kev MICROLAB I INSTRUCTION fois 7 0 AS MAI...

Страница 75: ...ALITY OB CARD CONNECTOR 10 ar 22 PIO yeoeo 206 97 OOO _ oe RESET COMPONENT NUMBER EXAMPLE Compre Raber eect eae R23 Ko RISA el soumenty eat tee Maa 2 eeGe ner na nome compere aenoRate prota tn on Pree...

Страница 76: ...Aa u4032 4 82 49060 Aa Aa 40320 2 B2 4040 cr B3 R7061 A Aa 4050 c3 83 ua060 83 B4 u20s0c a3 c3 us030 ca 82 20600 B81 ry us040 1 83 20608 01 c4 us050 B4 83 u2060C D2 ca u5060 ca Ba u20600 82 ca uso40 B...

Страница 77: ...a Has pene oe a al ve ont a is Ie amet ek U2Z060C es RANE 3 uaa T P O RTOe 5 Ag ie wfwfalale a uzos50c symi umn u5030 2 A USO6O ta oe Bot Sh jaz sya see MICROLAB I INSTRUCTION REV A MAY 1980 2021 30...

Страница 78: ...oe peel Hy fetsoe os slo mi Shine iv2 s 0 eee E bellees en a rn He a alice yale ba ia ideo ma Ba alt 3s oats ne pelsyste ee pia 8 5 He feeiis or ors alse HT 3 ae aes UeO6O ar ve 6 12 Bie ie os NOTE T...

Страница 79: ...l u2080 cr cs J8010 Fa Al 20908 Ba cs Jg098 Aa AS u2090c e2 cs J8098 F2 AS 20900 01 5 U2090F 81 cs R2040 3 cst 3090 D1 cS 2061 ca c3 uaosop ct 85 R2079 Ba cS usogop ct BS 2089 81 cs u7010 c3 AL 2096 8...

Страница 80: ...a2 208 p ces su val 2 804 We a i Gr tv na088 1080 7aLs86 See coor cReoeS uz0508 U1OS0B uz0s00 Epa Ne se aid Toor noe TALEOS R206 T4usie 10 2pt Lae see oe ae creoss 2078 ose UlO40B ny on 2 7415109 uK...

Страница 81: ...Ch l ryt CASSETTE ACiA 7 som a07 OF ee 6 24 B te Jns _ os 3 sv Jrwo 7G 7 ant z pe ee ae asv ale TH ral 7x55 3 D captal ae 2 YO PV 1 wee ceo FSe at 3 pelea is a rw 82 3 1050 T fe ese c pont ovreur WY h...

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Страница 83: ...0B 7413109 Display ENABLE ueo30F U4030D Yazzse 12 4300 are GB 4030 4 U30300 2 ote io Kame CHARACTER COUNTER u4020 u3010 Tause7o Jacsies br ate alt be ont es ole eche be U6030G ne eee me 1s aw Lay Os P...

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Страница 85: ...5071 Git Ba 4080 2 BS 6011 Git BI uaog0a F3 85 6051 Git B3 40908 F3 B5 6071 ar Ba uaog0c 4 85 6091 Gir BS us070 C1 Ba 7062 Gi a3 5080 c2 BS 7088 a AS 6010 a2 BI ceoit air AY U6030H F3 B2 8031 cir A2 6...

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Страница 88: ...Keypad Display Board COMPONENT NUMBER EXAMPLE Component Number A23 A2 R1234 Schematic Le Circuit Number Assembly l Number Subassemtly Number it used Chassis mounted componerts have no Assembly Number...

Страница 89: ...3 ca 2061 Ag B2 Ds1081 ea a 82081 AB 2 3023 c3 a2 J3082 Az c3 3025 cr Az J3082 5 3 3035 c3 82 J3082 ea 3 3037 C2 B2 3046 c3 82 02019 D1 AL 3048 c2 B2 02028 D2 Al 3062 ca 82 02035 D2 81 s3064 c2 82 020...

Страница 90: ...XAMPLE omponent Humber me 25RD RIDSO Stati Sensitive Devices See Materance Secon NOTE Tale 9 shows 10 Drow vee 8 GN MICROLAB I INSTRUCTION ss0ea ssose up AppR soe 5 2 S30 s3004 2 LppaTa oo a Ra07T9 18...

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Страница 92: ...mR48 Fh R45 048 B R46 hing R47 12V tawe aay game 2 A meh 2827 27 A15 Power Supply Board COMPONENT NUMBER EXAMPLE Component Number A23 A2 R1234 28 Le Gicut Maney sabsemayy Number if wed Chase mourted c...

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Страница 94: ...i i s98 rast a 2 1 25 4 i s CyeLLow2 9 4 fou 245 SE conanat9 3 F crepys 2 carowny 9 1 is no 330 Q NEUT FLICO S100 ia eovac fevac ia THERMAL les Bokoen CUTOUT Wy HLe COMPONENT NUMBER EXAMPLE Cd Compone...

Страница 95: ...5V SOURCE 12v source 3 IevAou Ras 10K l2vabu ies lev SouRCE IpF ed AIS POWER SUPPLY BD REV A MAY 1960 POWER SUPPLY zaz7 35 GUVO AlddNs YaMOd...

Страница 96: ...ts must be purchasedseparately unless otherwise specified ITEM NAME In the Parts List an Item Name is separated from the description by a colon Because of spacelimitations an Item Name may sometimes a...

Страница 97: ...1 RCA CORPORATION 30 ROCKEFELLER PLAZA NEW YORK NY 10020 70485 ATLANTIC INDIA RUBBER WORKS INC 571 W POLK ST CHICAGO IL 60607 71400 BUSSMAN MFG DIVISION OF MCGRAW EDISON CO 2536 W UNIVERSITY ST ST LOU...

Страница 98: ...00 6 83385 ORD BY DESCR END ATTACHING PARTS 20 407 2325 00 2 BRACKET ANGLE CIRCUIT BOARD 80009 407 2325 00 sretenssee9 ATTACHING PARTS 0 21 211 0614 00 4 SCRLASSEM WSHR 6 32 X 0 250 PNH STL CD PL 8338...

Страница 99: ...D ATTACHING PARTS 64 1 SWITCH THERMO SEE S100 REPL ATTACHING PARTS 65 210 0586 00 2 NUT PL ASSEM WA 4 40 X 0 25 STL CD PL 78189 211 041800 00 _ END ATTACHING PARTS o 66 334 3855 00 1 MARKER DENT MKD C...

Страница 100: ...18 ID AL 80009 166 0029 00 98 407 2480 00 2 BRACKET ANGLE GROUNDING ALUMINUM 80009 407 2480 00 a ATTACHING PARTS 99 211 0105 00 4 SCREW MACHINE 4 40 X 0 188 100 DEG FLH ST 83385 ORD BY DESCR END ATTAC...

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Страница 102: ...MICROLAB AlddNS Y3MOd 3YHNDIS...

Страница 103: ...JANVd LNOYS Z AHNDIS MICROLAB...

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Страница 105: ...86 4230 00 1 PL LATCH STRIKE ALUMINUM 80009 386 4230 00 ATTACHING PARTS a a7 211 0196 00 2 SCREW MACHINE 4 40 X 0 188 SCH HEX STL 000AH ORD BY DESCR see 82 END ATTACHING PARTS 18 200 2326 00 1 COVER C...

Страница 106: ...M 80009 105 0827 00 ATTACHING PARTS sf 33 211 0504 00 2 SCREW MACHINE 6 32 X 0 25 INCH PNH STL 83385 ORD BY DESCR 34 210 0457 00 2 NUT PL ASSEM WA 6 32 X 0 312 STL CD PL 83385 ORD BY DESCR _ END ATTAC...

Страница 107: ...161 0066 11 1 CABLE ASSY PWR 3 0 75MM SQ 240V 96 0 L 80126 oBD 067 0892 03 ONLY 161 0066 12 1 CABLE ASSY PWR 3 18 AWG 240V 96 0 L 80126 OBD 067 0892 04 ONLY 159 0022 00 1 FUSE CARTRIDGE 3AG 1A 250V 0...

Страница 108: ...E INTRODUCTION This section is devoted to the service part of the personality card Instruction Manual supplements shipped with your personality cards The supplements can be divided into two parts The...

Страница 109: ...g and shipping requirements we can t get these changes immediately into printed manuals Hence your manual may contain new change information on following pages Asingle change may affect several sectio...

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