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IBM 1620, Manual, Page: 32 / 86

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IBM 1620 Manual Download Page 32

Summary of Contents for 1620

Page 1: ......

Page 2: ...ion to system failures It is intended that function charts logics reference manuals etc be used in connection with the Service Index Each section of the Service Index is indexed separately and i nclud...

Page 3: ...ge 5 2 See I o Section 1622 Page 3 1 6 See Power Supply Section Page 6 2 See I O Section Typewriter Page 3 2 See I o Section 1621 Page 3 10 See I O Section 1624 Page 3 1 5 _ See General Trouble Shooti...

Page 4: ...GENERAL TROUBLE SHOOTING INFORMATION 2 1...

Page 5: ...ou scoped the sense lines using a 535 or equivalent scope and a type IIDII High Gain Differential Pre amp plug in unit H Have you checked the physical wiring of the indicators I Have you followed scop...

Page 6: ...e a Suspected line b J pins SMS Panels containing failures c AC input Iines at contactors 2 Indicator A drift latch may be wired into circuit and gated to indicate a transient pulse One of the test la...

Page 7: ...e Tip s Service Checks 1621 1624 1622 Read Checks Write Checks Read Checks Reader Checks off line Write Checks Punch Checks off line Known Trouble Tips Service Hints 1620 1622 Data Transfer Charts 3 1...

Page 8: ...it contacts Timing Relationship pg 3 3 Scoping Methods 1 The input translator may be scoped by blocking a typebar in its fully raised position with the type writer on off switch in the off position At...

Page 9: ...acts maladiusted The following relationship should exist Magnet Armature Contact 45 60 mill iseconds I 7 5 mill iseconds t I 5milli r i 5 milli I I seconds seconds I I I l I Selector Common Contact 1...

Page 10: ...ing properly Yes 1 Check Write Check Trigger and Circuit 4 Check Letter Cam Jl Check Selector comm n Contact 2 False Check NO MDR Correct vesl 1 Check for correct data in memory 2 Check MDR Trigger Re...

Page 11: ...nd in power roll and drive mechanism Ribbon failing to feed properly Oil on ribbon Ring and cylinder out of adjustment Dirty or glazed power roll Power roll may need to be replaced Cam Serration worn...

Page 12: ...tension Weak motor Bind in power roll and drive mechanism Tip of clutch knockout lever too low Clutch knockout lever Iink adjusted so knockout lever is too low Margin rack adjustment allows too much...

Page 13: ...ess of form Copy control lever set at improper position 3 7 Check platen guide yokes for loose platen SLOW OR BOUNCING SHIFT Improper cam adjustment Improper pin clearance Improper pusher adjustment B...

Page 14: ...g keybutton Glazed power roll BACKS TWO SPACES Cam repeats Excessive play in linkage Improper final stop adjustment Improper guide lug adjustment INTERMITTENT FAILURE Lack of lubrication on back space...

Page 15: ...re depressed simul taneously G TAB 1 Tab check lever two 2 spaces to the right of the tab stop on long and short tabulations 2 Tab speed about the same as carriage return speed 3 9 H RIBBON MECHANISM...

Page 16: ...ath False Read Check Check VRC Circuit G and A4A05B D H G on 02 83 50 1 Before the following diode adjustments are made clean the read head area to remove a II dust from the read window Make certain t...

Page 17: ...pattern Form the punched tape into a loop and place on the read head A good spl ice can be made by cutting the tape on an angle about 450 holding the ends of the tape with Channell toward you overlap...

Page 18: ...ss than the minimum 14 0v swing 2 Timhg Disk Lamp and Photo Diode The timing disk lamp must be adjusted so that both of the following conditions are met 1 The negative peak of the diode measured at A4...

Page 19: ...imately 509 sec div will spread the S output waveform across the scope face 8 Scope the sync diode output at A4A06C on 02 83 50 1 a Set the timing lamp potentiometer for lOv across the lamp b Adjust t...

Page 20: ...e Bit Pulse Latest Rise Time Bit Pulse Bit Pulse Difference In Duration Caused By Diode Characteristics And Individual Diode Potentiometer Adj ustment S On Light 1 3 14 I I 2 0 ms Minimum Fall Time Of...

Page 21: ...diode across failing punch Mag 1 Attempt to establ ish a fai lure pattern 2 Load memory with most consistent failure pattern 3 Sync on most convenient PCB Integrator for translator problem 4 Sync on...

Page 22: ...Reader Check Yes Yes See 1622 Off Line Section Page l t5J 3 7 1622 Console No Reader Check yes No Check Transfer to 1620 Circuitry Check 1 1620 Input translator circuitry 2 1620 1622 line drivers and...

Page 23: ...If with Card r SCR Agrees No II Check First Read Circuitry Check Second Read C irc uitry t T 1 Brush Condition Timing and Tracking 2 Contact Roll 3 Card Lever Contact and Relay 4 CB s 5 Card Transport...

Page 24: ...Write Checks No Yes 1620 MBR Check Yes See 1620 Memory Trouble shooting Section Page 4 2 Yes 1 1620 MBR to MDR transfer 2 1620 MDR reset Yes I Check 1 1620 Output Translator Circuitry 1622 Console Pu...

Page 25: ...Contact and Relay 4 CB s 5 Card Transport 6 Common Brush Circuit 7 Row Bit Cores and Register Circuitry Mrhanica Check Card Punched Wrong A2 and B2 Light SCR Agrees with Card E ectricai Check No 1 Pun...

Page 26: ...riplate IBM 70 PiN 435682 has been helpful in reducing belt and pulley wear 3 20 BRUSH TROUBLE 1 Check the reading brushes for correct timing and tracking 2 Brushes should be centered over the contact...

Page 27: ...ent roll shaft Wink must be checked around the cir cumference of the gears There must be a minimum perceptible wink and a maximum of 003 11 wink If an intermittent roll shaft breaks the gear wear in t...

Page 28: ...at A1 B04 AF 04 30 02 1 3 22 Row Bit Register 2 RBR 2 This single latch is turned on by the output of either the read or punch RB 2 sense ampl ifier To check 1 Run same test decks as when checking RB...

Page 29: ...eck of A1 A2 B1 and B2 circuits see procedure given under Reader Punch Check Circuits 3 23 1622 to 1620 Transfer Read Operations Continuous Transfer Loop The following procedure can be used to facil i...

Page 30: ...8 F 04 25 03 1 or punch buffer ready switch if machine so equipped 3 24 a For single cycle operations 1 Turn on single cycle switch 2 Turn on read select switch 3 Using CE start key single cycle 00 79...

Page 31: ...RBR 2 by grounding A1 B18 P 04 25 03 1 2 Turn on single cycle switch 3 Tum on read select switch 3 25 4 Using CE start key single cycle 00 through 79 First cycle through A2 and B2 on Second cycle thro...

Page 32: ...occurs alternation may stop If it stops run one feed and scope the interlocks involved Jumper wires may be used to force interleave between other latches This applied to pre IIJII suffix 1622 s only 1...

Page 33: ...D I Hub I For Negative Supply Voltage Scope Sync Hub R Sync xh I Source R May be 10K to 50K yD For Positive Supply Voltage D May be any diode or small selenium rectifier that has a voltage rating grea...

Page 34: ...ain single cycle the UT ring to check RB 2 to A2B2 and buffer transfer A2B2 Iights out single character register displays bit structure of character Reader Scan Ring was set for 3 28 17 Repeat 16 Buff...

Page 35: ...ly intermittent trouble experienced in comparing circuits on the 1622 the following circuit can be wired temporarily Itwill stop the clock in the UT ring posi tion and scan ring position in which the...

Page 36: ...un in cards connect inputs indicated in drawing to CBCR A1 at AlB 19D and CBCR A2 04 25 03 1 Connect Pin K II of VF circu it 1 in drawing to appropriate read or punch S Trans Accu on 04 10 08 1 or 2 M...

Page 37: ...NO FEED LAMP 5 Poh Chk 5 Poh CB Request hotch Inv Time S Pch Bul Scan a 4 10 09 2 Pch Buf J 1 J UT79 6RC5M272 _B322 04 01 02 1 r t l _ START 1622 CLOCK 17 2Run Rd Motor Delay Dropout Rd Motor Stort OR...

Page 38: ...810ckMARReset 01 59 10 1 n07 C So 1 0 Sam M R PchOi CL RoodBu Sean Lotch UT 79 S Pch Buf Rood No Sean in p No 1620 Writ Check Clock r r 614 01 Per MOl r Stort Pch Motor Dtlay Dropout No UT 79 No 1620...

Page 39: ...CORE STORAGE MBR Checks Service Procedure Scope Chart and Patterns 4 1 Page 4 2 4 3 4 4...

Page 40: ...equivalent 4 Electrical noise see General Trouble shooting Information See Page 2 3 4 2 l yes At this point run system and record the following 1 Address which failed 2 Bit that failed 3 Was bit picke...

Page 41: ...and thousands i e OOOXX to 099XX and 100XX to 199XXor OXXOO to OXX99 and 1XXOO to 1XX99 With conditions in Step 5 but in banks of 10 Operation Switch 3 Switch 4 Force all bits Normal Normal Blank Mem...

Page 42: ...S Current Source G A D Current B Driver C Matrix Switch Voltage Pattern 9a Page 4 7 C D Inhibit Driver A Current Pattern 9b Page 4 7 Voltage Pattern 6a Page 4 6 E SWD IL Current Pattern 6b Page 4 6 Vo...

Page 43: ...f H L H I I r t 1 1 H I 1 t l l 1 Hf 4 1 1 r H b l 1 t l7 I 4 5 1 Current Driver Units input A2K28A at lO volts cm Units gate A2K28B at 10 VOltS CIllo 2 Current Driver Inputs a h c jld Units A2K28A T...

Page 44: ...rrent Driver Output a b Units Output A2K28C at 100 rna ern Units Output A2K28C at 20 volts ern 5 Current Driver Output a Units A2K28C b 1 Tens A2K27C Hundreds A2H03C Thousands A2K02C 6 Units Decode Sw...

Page 45: ...50 mv em b Strobe A2F28H at 10 volts em e Output A2F28F at 10 volts em 8 Pre Sense Amplifier 50mv a rl Ov rHH HH HHH 12v l lOv 0 100ma o Rl R2 0 2us em I I 1 I W6 I l t I Rl 2us em 1 I I lr I WO W k 4...

Page 46: ...MAR Checks Service Hints MAR MAR Function Charts Page s z 5 3 5 4 The se are drawn from F suffix logic s but are satisfactory for general use on any suffix 1620 5 1...

Page 47: ...eg Used On Cycle Befor No I Failing Cycle I The Same 1 Bit Driver and 1 Check Sense Amp Ckt Check MAR T 1 Refer to Bit 1 Check Read See 1 Check for Mult iple Regs Reading or Writing on On Cycle Assoc...

Page 48: ...0011 to 00023 6 IIE cycle entry Change status of lnc Dec trigger 7 Trg 18 Read OR 2 Write IR l Bypassed branch back toOp 25 To scope a decrement problem sync scope on Trg 26 or Trg 27 Note During this...

Page 49: ...12 S Trg 47 or 48 S 4 Units I S T4D7 r T4D15 Deer 2 S Trg 48 S 1 Units S Trg S Bypass 5 not S Incr 2 Incr A S C Units S Units 47 5 C Units 52 Units S 1 Units 52 Units S 5 C Write Units C DIB Sam S Set...

Page 50: ...ss 5 not Iner 2 T407 or T4015 Bypass Units 5 C Units Deer 54 Units T407 or T4015 52 Units 52 5 1 Units Units 54 Iner 58 Bit MAR Units 01 55 06 1 5 1 Iner Units Iner 52 Units 5 Trg 47 or 48 58 Units 01...

Page 51: ...52 52 Units Units Incr Incr 5 Trg 47 or 48 5 T407 or T4015 54 Units Oecr 2 5 C 540 B Units Write Units Sam 54 Bit MAR Units 01 55 06 1 54 nits 54 Units Incr 2 5 Trg 48 5 Trg 47 52 5 Bypass 5 Not Incr...

Page 52: ...s 52 5 C Units 52 Deer ir Units Iner Deer 52 Bit MAR Units 01 55 09 1 5 Trg 48 5 Bypass 5 Tr3 gA 5 Not 47 Iner 2 01 5 09 1 Switch Units Iner 2 Trg 3 Trg 5 Trg 2 f Tr9 30 Trg 1 0 RA WA Trg 6 58 Units 5...

Page 53: ...3 1 5 Trg 48 5 Bypass 5 Tr 5 not 47 y Incr 2 01 55 09 1 5witc Units T407 or 5 1 T4015 Units 5 1 Bypass Write Units Sam Units Units Incr 2 T407 or T4015 Incr Deer 5 1 Bit MAR Units 01 55 09 1 Deer 2 5...

Page 54: ...CJl s C Tens s 1 Tens Incr 2 1 Tens Incr Write Tens Sam Units Carry Inc Dec I Cycle 1 0 SC Bit MAR Tens 01 55 15 1 T4D7 or T4015 SC Tens T407 T4015 Bypass S 4 S Units Carry Oeer Decr S 1 Tens S C Tens...

Page 55: ...Tens Incr n o S 8 S 4 Oecr S C Tens Tens S 2 S 1 S 2 Tens Tens Tens Tens o T407 or T4015 Write Tens Sam Units Carry S Units Carry T407 or T4015 6 r I Cycles Bypass 0 58 Bit Tens 01 55 16 1 S 8 Tens I...

Page 56: ...52 Tens 54 Tens Incr 52 Incr Write Tens 5am 54 Dis I Tens A Units Carry 5 C 5 4 Bit Tens 01 55 19 1 T4D7 or T4D15 T4D7 or T4D15 5 Units 54 Carry Tens Bypass 5 C Tens Decr 52 Tens 54 Tens...

Page 57: ...58 Tens 5 1 Tens Iner 01 58 Tens 52 Tens Write Tens 5am 5 1 T407 or T4015 5 2 Bit Tens 01 55 19 1 52 Tens Deer 5 Units Carry 52 Tens T407 or T4015 5 Units Carry 52 5 C Tens Tens 5 1 Tens Deer...

Page 58: ...Write Tens Sam 5 1 DIB Tens S 1 Tens Units Carry Inc Deer 5 1 Bit MAR Tens 01 55 19 1 T4D7 or T4015 5 1 5 Units Tens Carry...

Page 59: ...S C Hund S 1 Hund S 3 Units 2nd Trg 13 Exp Add R5D6 S C Switch Hund T4D7 or T4D15 Write Hund Sam S C Hund Incr D Bypass ecr Hund S C Bit MAR Hundreds 01 55 25 1 S 4 Hund T4D7 or T4D15 Deer S C Hund S...

Page 60: ...Incr S 2 Hund S C Hund S 2 Hund S 4 Hund Decr S 8 Hund Incr I __________________ 0 S 8 Hund T4D7 or T4D15 Switch Hund T4D7 or T4D15 Bypass Hund S 8 Bit MAR Hundreds 01 55 26 1 Write Hund Sam S 8 D B U...

Page 61: ...Incr S 2 Hund S 4 Hund Incr S2 Hund S C Hund Incr S 4 Hund Switch Hund Bypass Hund S C Decr T4D7 or T4D15 S 4 Bit MAR Hundreds 01 55 26 1 S 4 DIB Units Decr Write Hund Sam S C Hund S 2 Hund Decr...

Page 62: ...5 1 Hund Incr 52 Hund T4D7 or T4D15 58 Hund 52 Hund Deer T4D7 or T4D15 Switch Hund Bypass Hund Incr I Deer I S 2 Bit MAR Hundreds 01 55 29 1 Write Hundred Sam S 2 DIB Units 52 S C Hund Deer...

Page 63: ...OJ 00 Write Thou Sam S 1 Thou I C cles T4D7 or T4D15 1 0 Incr ecr S 1 Bit Thousand 01 55 39 1 Switch Thou Bypass Thou S 1 Thou T4D7 or T4D15...

Page 64: ...ou S 1 Bypass Thou T4D7 or T4D15 S 2nd Trg 13 Exp Add R5D6 S C Thou 51 0 Thou A T4D7 or T4D15 Decr Switch Thou Incr Decr I Cycles S C Bit Thousand 01 55 35 1 S 4 Thou Thou S C DIB Tens Write Thou Sam...

Page 65: ...1 Th Incr 2Th Decr S 2 Th S 1 Th a Write Thou Sam T4D7 or T4D15 Switch Thou Bypass Thou S 8 Bit Thousand 01 55 36 1 T4D7 8 Th Incr...

Page 66: ...Incr S 2 Th 4 Th Incr S 2 Th T4D7 or T4D15 C Th Switch Thousand Write Thousand S 4 DIB Tens Sam S 4 Bit Thousand 01 55 36 1 T407 or T4D15 S 2 Th Bypass Thousand Dec S 8 Th S C Th Dec...

Page 67: ...01 N N S 1 Thou S 2 Thou Iner S 2 S 2 S 2 58 S 2 Thou Thou S 1 p Decr S 1 Thou Thou T407 or T4015 T407 or T4015 nfr Deer Bypass Thou S 2 Bit Thousand 01 55 39 1 Switch Thou Write Thousand Sam Deer...

Page 68: ...01 T407 or T4015 S 1 Bypass Hund Hund S 1 Hund T407 or T4015 Incr Oecr Switch Hund S 1 Bit MAR Hundreds 01 55 29 1 S 1 OIB Units Write Hund Sam...

Page 69: ...5 1 T Th Incr Incr 5 Boe 2 T4D7 or T4D15 Units Carry 5 Boe 4 Decr 5 Switch Tho T4D7 or T4D15 Incr Decr 5 e Bit Ten Thousand 01 55 45 1 Units 5 1 T Th T Th is Write Sam 2nd 13 Exp Add R5D6 5 1 T Th Dec...

Page 70: ...T Th 4 D B Units 5 1 T Th 4TT T4D7 or T4D15 Write T Th Sam Incr De cr 54 Bit Ten Thousand 01 55 49 1 1 T Th Deer1 4 T Th Switch T Th Bypass T4D7 or T4D15 4 T Th 60 K Systems Only 1 T Th 5 1 T Th Deer...

Page 71: ...5 1 T Th ncr S C T Th Incr S 1 T Th Write T Th Sam S 2 DIB Units Switch T Th Incr I Decr S 2 Bit Ten Thousand 01 55 49 1 T4D7 or T4D15 Bypass 40 K Systems Only T4D7 or T4D15 S 2 T Th S S CTTh 4TTh Dec...

Page 72: ...S 1 T Th S Switch Thou Bypass T407 or T4015 S 1 T Th Switch Thou I C cles Incr 0 I Oecr S 1 Bit Ten Thousand 01 55 45 1 T407 or T4015...

Page 73: ...Service Hints Condensed Logic POWER SUPPLY 6 1 Page r z 6 3...

Page 74: ...sink or for a bad power supply SMS card 6 If the output voltage is high and CB 1 did not trip replace the overvoltage protective device or over voltage SMS card if supply is so equipped 7 An open dio...

Page 75: ...PCB 1 A g _ l I KI TI _ PWR ON r v J Immediate R 1 Off Switch R R 104 n 1t 1620 Po RESE 1 4 wer Sequen clng 105 104 RLY 118 1623 FAN RELAY 101...

Page 76: ...R104 2 N O 104 1Pl N C 1623 48 Vac R104 2 N O 1620 C I 24VAC REC B To detect which machine is causing thermal condition hold down reset on 1620 and note which thermal lamp does not go out 6 4 Therm k...

Page 77: ...Original Fortran Format Fortran FORTRAN 7 1 Page 7 2 7 6...

Page 78: ...Refer to section that applied to the type of Fortran being used SECTION II Original Fortran The object program used in the original Fortran consists basically of transmit field Op Code 26 and branch...

Page 79: ...JECT PROGAAIICD t FACT A FACT B FACT j FACT 0 FACT E FACTOIt F 26 00060 19XXx 27 00422 19xxx 26 19XXX 00060 26 00060 19xXX 27 01050 19XXX 26 19xXX 00060 A B C _ OxE F FACTOIt A FACT B FACT C FACT 0 FA...

Page 80: ...loating Divide FDV 2 01286 Floating A to the B Power FAXBN 2 01290 FJoating A to the B Power FAXB 2 01956 Floating Natural Logarithm FLN 1 02036 Floating Exponent FEXP 1 02958 Floating Square Root FSQ...

Page 81: ...subroutine and on the instruction at the IR l minus 12 address Dump as follows 35 IR l minus 12 00100 35 lR 2 minus 12 00100 The IIpll address of the instruction at the IR 2 minus 12 address is the a...

Page 82: ...o FAC subroutine located in 01238 in memory This instruction is not needed for subroutines requiring only one factor i e FLN FSQR etc The Floating Accumulator initially is used to store a factor of an...

Page 83: ...ad into Floating Accumulator TOFAC 1 01238 Store from Floating Accumulator FMFAC 1 01306 Floating Multiply FMP 2 01378 Reverse Floating Divide FDVR 2 01756 F loating Divide FDV 2 01862 Reverse Sign RS...

Page 84: ...the following steps 1 Display IR 1 and IR 2 2 If IR 2 is blank the fai lure occurred in the object program and on the instruction at the IR 1 minus 12 address Dump as follows 35 lR 1 minus 12 00100 3...

Page 85: ...ingle cycled through the subroutine instructions The customer Fortran listing containing machine language instructions for these subroutines at the end of the listings may be used to check machine ope...

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