Manual / Guide · 1964-1968
Friden EC-130/EC-132 Service Letters #1-#35 (1964-1968)
The factory service letters for the 130 and 132, from July 1964 to June 1968: field changes, fault fixes and production changes, including the three-counter change.
Manual / Guide · 1964-1968
The factory service letters for the 130 and 132, from July 1964 to June 1968: field changes, fault fixes and production changes, including the three-counter change.
-_KEEP EFFICIENT SERVICE THiS FILED IN NUMERICAL ORDER. | id ELECTRONIC CALCULATOR 130: [xe [ ‘ell SERVICE LETTER : 7~21-64 A FRIDEN PRODUCT TO ALL FRIDEN OFFICES SUBJECT: REFERENCE: ACTION: REASON: FORM 73-169-SL Plug-in Circuit Card Jacks Serial numbers 1040-1090 (approximately) Report to San Leandro immediately any troubles related to plug-in card jacks, Include machine serial number in report, Cracked jacks and intermittent contacts may occur in referenced serial numbers, Indications can be: card not seating firmly, intermittent trouble when vibrating or slightly rocking plug-in card, or any intermittent trouble not otherwise identified. FRIDEN, INC. San Leandro General Service Department FSCR EEA to le te tealics, FILED IN NUMERICAL ORDER EFFICIENT SERVICE Krid ELECTRONIC CALCULATOR 130 [xo ~TNden SERVICE LETTER a | 8-5-64 A FRIDEN PRODUCT TO ALL EC-130 SERVICE DEPOTS SUBJECT: Plug-in Circuit Card Jacks (Friden No. 803206) REFERENCE: EC-130 Service Letter No. 1 ‘NOTE: This letter supersedes Service Letter No. 2. REASON: Intermittent troubles have been traced to bad plug-in card jacks on some machines in the group serialized 1040-1090 (approximately). TIN WIRE AND MAKE HOOK a/ FORM 73-169-SL INSTRUCTIONS: FORM 73-169-SL Replace jacks if intermittent operation results when pressing on a plug-in card or if servicing indicates trouble in jacks. Point A illustrates soldering technique that is causing trouble. Point B illustrates method to be used when replacing a plug-in -card jack. When replacing a jack, the new jack should be placed alongside bad jack and leads transferred one by one to corresponding terminals. Otherwise, each lead will have to be tagged since these wires have no number coding. FRIDEN, INC. San Leandro General Service Department ( } KEEP FAs FILLED IN NUMERICAL ORDER EFFICIENT SERVICE | id ELECTRONIC CALCULATOR 130° [xe Ndell SERVICE LETTER é A FRIDEN PRODUCT 9~-3-64 TO ALL EC-130 FIELD SERVICE OFFICES SUBJECT: Plug-in Circuit Card Retaining Plates (Friden # 801574) REFERENCE: Production Line Change.. REASON: ‘Present installation of only one card retaining plate is unsatisfactory. INSTRUCTIONS: Remove present retaining plate and replace with double retaining plates as per sketch. NOTE: -In cases of extreme difference in card heights, it may be necessary to cut a slit(s) in the lip of the plate and form the lip up or down for a particular card, or cards. F RIDEN, INC. San ‘Leandro Gerieral Service Department (Over) FORM 73-169-SL EC-130 Service Letter #3 Page 2 2892 6-32 SCREW i) K £- Er Teak es FiuweE Db IN NUMERICAL ORDER EFFICIENT SERVICE i "1 “ELECTRONIC CALCULATOR 130. [> I] ell SERVICE LETTER ‘ A FRIDEN PRODUCT TO ALL EC-130 FIELD SERVICE OFFICES SUBJECT: Spacers in Plug-in Card Shipping Box. REFERENCE: . Friden #8462. REASON: Boxes #8462 are 1/2" too long. Plug-in cards can move excessively during shipment. ACTION: When packing plug-in cards for shipment, make spacers out of cardboard and fit between rubber packing blocks (#8463/64) and the boxes. Ensure that enough spacer material is used so that plug-in cards are held firmly in rubber packing blocks with no end play. FRIDEN, INC. San Leandro General Service Department FORM 73-169-SL KEE P Dh tei Uo FILED IN NUMERICAL ORDER EFFICIENT SERVICE | id ELECTRONIC CALCULATOR 130. [xo at Ci SERVICE LETTER : A FRIDEN PRODUCT 9-11-64 TO ALL EC-130 FIELD SERVICE OFFICES SUBJECT: REFERENCE: REASON: ACTION: FORM 73-169-SL Simplified Keyboard Tester, Authorization to Build. None. Experience has shown that a small portable keyboard tester would be advantageous for common service problems re- lating to keyboards. All Field Service Offices are authorized to build a small keyboard tester as shown on the schematic and parts list on page 2. Note that AC input plug is same as the EC-130. When using tester, use EC-130 power cord for AC input as keyboard tests and adjustments are made with no power to EC~-130 thus en- abling EC-130 cord to be available for tester. To use tester, simply connect to keyboard connections assoc- iated with suspected malfunctioning key. Reference drawing EC-130-8-T for keyboard connections. Refer to Keyboard Adjustment Section (3) of EC-130 Field Service Manual for information as to proper keyboard action. FRIDEN, INC. San Leandro General Service Department (Over) EC-130 Service Letter #5 Page 2 LEECRAFT TINEON +#*3600 so (OR EQUIV.) COM. FUNCT.(I18) OR COM. DIGIT (19) EC-I30 AC INPUT CON- NECTOR FRIDEN 310690 FUNCTION OR DIGIT | | | ' BLUE J | To —KEY TERMINAL CENTER PIN | / \ : | NOT USED r | \ : \ ” ‘BLACK GROUND ON —o4 | , oa {—<— KEYBOARD (24) L_ ? Sry «= eet | — \ Vow | \ hens | | ! yt © | RED “i BLUE MINIBOX o—|—BLUE __ + CU-2100A (OR EQUIV.) | BLACK _ LIST OF PARTS 2 Leecraft Tineon #3600 (or equivalent) (125V neon with 100K built-in resistor) 1 100K, 1/2W, + 10% resistor 2 ft. 20 gauge red wire 2 ft. 20 gauge black wire Flexible Test Lead type wire is 2 ft. 20 gauge blue wire recommended 1 AC Input Plug, Friden #10690. 3 Taper Pin Connectors, Friden #223434 1 Mini Box #CU-2100A (or equivalent) As required Hook-up wire NOTE: Local purchase of items other than Friden. Friden Numbers order from San Leandro. ~ KEEP THIS FILED IN NUMERICAL ORDER EFFICIENT SERVICE f id ELECTRONIC CALCULATOR 130. [x= Nden SERVICE LETTER eS This cancels Service Letter No. 5 & 6. Retain Schematic 4-14-65 A FRIDEN PRODUCT ; > a aye Drawings for point to point wiring reference. TO ALL FRIDEN OFFICES SUBJECT: Simplified Keyboard Tester REASON: Experience has shown that a simplified keyboard tester capable of test- ing all digit and function keys using the VOM meter would be advantageous. INSTRUCTIONS: | SevuOARD Y dabei: PIN CONNECTION ¢ .— 2 re 10K 5% NO. 5 | | | I _ NO. 4 | | ° NO.3 - l I L WHITE i —_t=-—_)—] 10K 5% /—® NO.2 | =) - ae 10K 5% +-—® NO.1 or NAME | Ohms x | 1 | ——d CF or CD \2 C67 © ZA oe PIN 24 TEST PROCEDURES ~ -— This inexpensive adapter to the volt ohm meter allows the technician to positively determine the correct sequence of operation for any digit or function key. FORM 73-169-SL EC-130 Service Letter #5A Page 2 The circuit consists of five (5) resistors connected in parallel with a common input to the ohm meter. The CD (Common Digit) or CF - (Common Function) output is through a wire with no resistor in series. This allows for easy detection of early closing of the CD switch in relation to the digit code being set or CF early closing in relation to function key switch, such as plus or minus keys. CHECKING SEQUENCE: The volt ohm meter is zeroed in on the X10 scale and connected in series with the test circuit. 1. To check common digit in relationship to closure of digits "0" through "9": Connect black wire to the CD switch, pin 19. Connect the five (5) white wires to pins 1, 2, 3, 4, 5. Connect VOM lead of meter to pin 24. 2. Depress "0" key and release. This restores all code bars. The VOM reading should be infinity. Any other reading would indicate one (1) or more reed switch has remained closed. Disconnect each white wire and the black wire, one at a time, to determine the closed or shorted reed switch. Cj 3. Operational sequence check. a. Depress 0 key slowly to pad. Reading jumps from infinity to 0. b. Depress 1 key slowly to pad. Reading changes to 10K then jumps to 0. Release key, reading is now 10K. This is due to the fact that there are no return springs on any of the digits one (1) to five (5) code bars and the code bars remain operated thus keep- ing the reed switch closed. , c. Depress 0 key slowly to pad. Reading jumps from 10K to in- finity and then to 0. d. This procedure is to be completed with each digit key. It is necessary to understand of course that the digit 5 key will have a lower ultimate reading before going to 0. This is due to placing more resistors in parallel before the operation of CD switch. e. A program to follow that checks both the opening and the closing of the numbered reed switches before closure of the common digit switch is as follows: Press, check, and release each key as shown. 0-1-0-2-0-3-0-4-0-5-0-6-0-7-0-8-0-9-090. This test will check that each code bar reed switch is operated prior to the common digit switch. The ohm meter reading must EC-130 Service Letter #5A Page 3 PARTS REQUIRED: 5 ea. 223257 7 ea. 223434 .5 ft. 1 ft. reach its ultimate value, as listed in the accompanying chart, prior to the closing of common digit and will probably, but not necessarily, reach this value in increméntal steps as the individual switches are opened or closed. Another test would be to press, check, and release each key in the following manner: 5-0-5-1-5-2-5-+-3-+-5-4- 59-6-5-7-5-8-+5-9- 0. This will check the ability of the code bar reed switches to open prior to the operation of the common digit reed switch. . Function keys must operate the code bars, for interlocking re- quirements, and this may be checked by installing the black lead on the CF switch, pin 18. The ultimate value listed in the chart should be reached prior to closure of the CF switch. Operation of the 0 key before the function key will restore the meter to infinity for easier checking. Operation of the function reed switches, in relation to the Common Function switch, may be checked by removing all white wires from the numbered reed switch and connecting one (1) of these wires to the function reed switch to be checked. This will then show a meter movement from infinity to 10K ohms and then to zero (0) ohms, as the switch is operated, and from zero (0) ohms to 10K ohms to infinity, as the switch is released. Resistor 10K, 5% Taper Pin Connectors White Wire (24 gauge hook-up patch wire) Black or Colored Wire (24 gauge hook-up patch wire) FRIDEN, INC. 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Bone 1 mSda ( Ak é E'S ae (N3GGIH) uud coSS y _ ts . , “oe XMd 3Nt1 Av1730 5 é ye > . lab : OL 3 cal. Sd dd 6d ur} id 8d 3d vd NMOUG-tL NAMOUB -11 ae 2-24 vad KEEP THIS FILED IN NUMERICAL ORDER EFFICIENT SERVICE Frid | ELECTRONIC CALCULATOR 130° [3S nden SERVICE LETTER : - A FRIDEN PRODUCT 9-25-64 TO ALL EC-130 FIELD SERVICE OFFICES ' SUBJECT:- |. How To Use Simplified Keyboard Tester. REFERENCE: Service Letter #5. ACTION: Service Letter #5 authorized a simplified keyboard tester. The following are basic instructions on use of the simplified tester. a. Isolate malfunction to a specific key on keyboard. b. Remove EC~130 bottom cover plate. , c. Refer to Friden drawing #130-8-T which was furnished with Service Letter #5. d. Determine from drawing the keyboard terminal associated - with that key. -e. Remove taper pin connection from that terminal and replace with "key" lead from keyboard tester. f. For a digit key, remove taper pin from terminal #19 and replace with "CF/CD" lead from tester. For a function . key, use terminal #18. g. Remove taper pin connection from terminal #24 and replace with "ground" lead from tester. h. Connect tester to AC with EC-130 power cord. i. Refer to Section 3 of the EC-130 Field Service Manual for information as to operational sequence of the key involved. j. Upon completion of test, replace all keyboard taper pin ‘-eonnections, carefully observing wire number to taper pin coding. k. Replace EC-130 bottom cover plate. 1. Re-connect EC-130 power cord. NOTE: In all cases of digit key or function key testing, the basic requirement is that the "key light" comes on before the "CF/CD" light with depression of the key. Also that the "CF/CD" light goes off before the "key" light with release of the key. _FRIDEN, INC. ' San Leandro General Service Department HORM 732..169.S1. K EE P THIS Po eS IN NUMERICAL ORDER EFFICIENT SERVICE Irid ELECTRONIC CALCULATOR 130 [wo | T] Cll SERVICE LETTER 7 A FRIDEN PRODUCT 11-20-64 TO ALL FRIDEN OFFICES SUBJECT: Resistor Change. MODIFY: All EC-130 Calculators below approximate serial #1560, at time D card is serviced. ; REASON: The change is being done because excess lead length both on the ' card and the back wiring, in addition to narrow width printed circuit wires, results in excess inductance. This inductance causes HOME pulse to over~shoot by 1V to 2V at gate 1308 on the 'E' card. This problem shows up in the multiplication of 2 nines by 2 nines in the 13th decimal place. .99 x .99 =980ly ‘The answer in error is .8901. The error occurs in the first 9 additions when the digit 9 in the sum 891 is in the most significant position of R1 and is shifted left to the least significant position of R2. The over-shoot from the 1308 gate resets the D5 flip-flop and a zero is placed into the LSD of R2 instead of a 9. Then the second 9 additions, added to the digit 1 that was left in Ri, result in the answer 8901. REFERENCE: Page .016.00AB Construction File Element AA 0109.005.0. ae - Absolute co-ordinate location D078-090. Visual co-ordinate approximately D0926R. 6.8K resistor changed to 2.2K. INSTRUCTIONS: Since the above starting serial number is approximate, when . the D card is serviced, check to see whether a 6.8K resistor is present at D0926R. If it is, change to a 2.2K, 1/2W, 5% resistor, Friden #223253. PARTS REQUIRED: (1) 223253 Resistor - 2.2K, 1/2 W, 5%. FRIDEN, INC. San Leandro General Service Department Re FORM 73-169-SL KEEP THIS FILED IN NUMERICAL ORDER EFFICIENT SERVICE | id : - ELECTRONIC CALCULATOR 130: [no deh SERVICE LETTER - A FRIDEN PRODUCT 3-12-65 TO ALL FRIDEN OFFICES SUBJECT: MODIFY: REASON: INSTRUCTIONS: PARTS REQUIRED: FORM 73-169-SL Grounding of Power Transformer 804002. All EC-130 Calculators below approximate serial number 1800. Should the case of the power transformer not be properly grounded the minute leakage from the windings to the case may cause a charge to build up on the case. When the charge builds high enough, it jumps from the transformer to the calculator frame (through the paint on the transformer case). This dis- charge causes a voltage spike on all power supplies and may cause the data to change at random, or a flash on the CRT. The repetition rate may be from several minutes to seconds. Remove the screw, lockwasher and flatwasher diagonally opposite power switch; discard flatwasher and lockwasher. (Note: This screw, screws into the frame.) Scrape paint from transformer under washer. Replace screw and use Star Lock- washer, Part #4688. Be sure lockwasher makes good contact to transformer. 1 - 4688 Star Lockwasher. FRIDEN, INC. San Leandro General Service Department AOC Lf SC | tae KEEP THIS FILED IN NUMERICAL ORDER EFFICIENT SERVICE A FRIDEN PRODUCT } id ELECTRONIC CALCULATOR 130° [xe fl i. SERVICE LETTER ve 3-12-65 This Letter su des EC-130 SL BERS ai Revised Date DESTROY EC-130 SL #8 4-8-65 TO ALL FRIDEN OFFICES SUBJECT: MODIFY: REASON: INSTRUCTIONS: PARTS REQUIRED: sa Whe FORM 73-169=SL —=> Grounding of Power Transformer 804002. _ All EC-130 Calculators below approximate serial number 1800. Should the case of the power transformer not be properly grounded the minute leakage from the windings to the case may cause a Charge to build up on the case. When the charge builds high enough, it jumps from the transformer to. the calculator frame (through the paint on the transformer case). This dis- charge causes a voltage spike on all power supplies and may cause the data to change at random, or a‘flash on the CRT. The repetition rate may be from several minutes to seconds. Remove the screw, lockwasher and flatwasher diagonally opposite power switch; discard flatwasher and lockwasher. (Note: This screw, screws into the frame.) Scrape paint from transformer under washer. ‘Replace screw and use Star Lockwasher, Part #4559. Be sure lockwasher makes good contact to transformer. 1 - 4559 Star Lockwasher. FRIDEN, INC. San Leandro General Service Department EFFICIENT SERVICE K E EP THIS FILED rN NUMERFCAL ORDER ~ | Friden / ELECTRONIC CALCULATOR 130- [xo A FRIDEN PRODUCT SERVICE LETTER 4-1-65 TO ALL FRIDEN OFFICES SUBJECT: MODIFY: REASON: INSTRUCTIONS: 00 PARTS REQUIRED: CHARGES: NOTE: REFERENCE: FORM 73-169-SL Decimal Switch, Position 0-2-5-9-13. Any EC-130 as required for customer application. Due to customer's application, a "9" position decimal setting may be required. 1. Remove keyboard. 2. Remove printed circuit board. 3. Loosen the two (2) allen head screws and remove the gear from the decimal switch shaft. 4. Remove screws holding pin plug assembly. 5. Remove nut holding switch assembly and remove switch assembly. 6. Install new switch assembly, reversing procedure of Steps 3, 4, 5. The decimal switch should be in position "0" or "13" when reassembling. 7. Replace decimal switch indicator with new indicator. Install printed circuit board. 9. Install keyboard and reconnect wiring. Check the position of the decimal switch indicator before final tightening up. 1 ~ 803560 Decimal Switch Assembly - Positions 0-2-5-9-13. 1 - 802582 Decimal Switch Indicator - Positions 0-2-5-9-13. This special switch is to be installed in branch or agency office for a charge of $45.00, plus pick~up and delivery charges. This is a Service Department item and is to be billed as normal Service Department billing. No credit will be given for the old decimal switch or indicator. This is the only special decimal position which is authorized. Sales Department Calculator Release #0024, dated 11/20/64. FRIDEN, INC. San Leandro General Service Department TRUTH TABLE | DPS | FE H/uvl KIL | | as 0 POS. olo}o|oj]co 11olojlojc1 177 o lolilolo|ce 1/1jojolcs3 2 jolol1folc4 > 1/o]/1])o0/c5 oj/1]/1folce 5 |111]4]o]c7 174 olololifics (7) [1 lolo]1f[c9 o0/1}/0]1{]c10 - 9 {1]/14]o0]14]c11 o/o]141/c12 1101144 {C13 178 ol1]1]4le14 13 }1 fafa [471s DECIMAL POSITION COUNTER 0 A 475 I | yors4 183 fe) , 182 a 0 179 ) 181 9 of 2." 1 xao7 13 a O | 3,88 | teL2 ——“4176 | jp = 4 KEYBOARD | G PLUG-IN CARD D130-70T-1 ‘ b-MZ28~O¢LO 919071 YSLNNOD LNIOd TVWI930 HOLIMS ‘d'G = Tz0 i <<s5030 x | bnwa 9zsq | 250 | 8s0 ©zsa] 5 | 0 | a-6a u-ea iq Li-6aA . (13834) 63043 ¥ ¥ y y 6go| Ostt O6tt 00zb Ores baWOH 2890 zvo0 = Zz00 2190 sora 4 €zsa = ehh a LV vabe - GEL 2 Lwoes : vist o vw belt zorax —_ L6 tb ZbLax Oc} Zevax ——~ bheb Te 10x 110 $890F oaaq bv9Q0] o4gq {[26ht 6290] gaq f202 $4190] 900 eased] 20 zal zbeb i 2bod E6bb £071 ‘i bSd03) sag o | vows LE | ES €Z60 gio x 2yLax al ol zZLbax esnwa bAQa zgo €XUIy] . €xurv - Ny eine Sifiyt}iyt dF 2—mvijifiltlo €'frtrjoti SS ge ee oS z1{i1[ifojo 91 s—ein{rlolifs ray | orf 1 ofilo ° af 2—® 6/ifolols ° | 8] i1}ololo qT ¢ 6a kro ist 2 i 9fofsiliyo > 2 sfolifofi ee ere _ _. See a z | 2aNa ploli{olo|@— 13s wn ci——m clofolif | oar z{olo]ijoj@~ sas aaiaic 1fofofo}i ofo[ofolo aasaua ON@ > ZI NO!L/SOd da oad Tv wio30 a1avi Hind K EE P THIS FILED IN NUMERICAL ORDER ceeniGler Rune op jor | id ELECTRONIC CALCULATOR 130° [xo iif Cll SERVICE LETTER = 4-28-65 A FRIDEN PRODUCT TO ALL FRIDEN OFFICES SUBJECT: Vertical Register Spacing. ' MODIFY: Any EC-130 Calculator when necessary. REASON: To allow sufficient tolerance for proper adjustment of the display. In the present circuit it is sometimes impossible, even with the Vertical Character Spacing (VCS) potentiometer set to maximum, ‘to adjust the display to the proper height of 1" while maintaining the proper character height. INSTRUCTIONS: 1. Replace the 9.31K ohm resistor at co-ordinates G0818R with a 4.64K ohm resistor. 2. Replace the 4.64K ohm resistor at co-ordinates G0518R with a 2.32K ohm resistor. 3. Insert appropriate notes in the MDD construction file for element 3012 at lines 3012.005.0 and 3012.008.0. PARTS REQUIRED: 1 - 804024 Resistor, 2.32K ohm, 1%, 1/2W. 1 - 804026 - Resistor, 4.64K ohm, 1%, 1/2W. REFERENCE: MCA 281 FRIDEN, INC. San Leandro General Service Department FORM 73-169-SL K EE P Tae (Ss: - (pels Eee EN NUMERICAL ORDER EFFICIENT SERVICE Frid |. ELECTRONIC CALCULATOR 130. [xe Mdet) SERVICE LETTER LOA A FRIDEN PRODUCT 7-16-65 NOTE: This Service Letter Supercedes Service Letter #10, _TO ALL FRIDEN OFFICES SUBJECT: Vertical Register Spacing. -MODIFY: All EC-130 Calculators previously modified per Service Letter 10 when the G-H card is serviced, and any other EC-130 Calculator as required. REASON: To allow sufficient tolerance for proper adjustment of the display ' to the proper height of 1" while maintaining the proper character height. This modification provides better adjustment character- istics than the modification of Service Letter 10 which introduced - a too much character slant on some machines, . INSTRUCTIONS: . 1. If there is a 4.64K ohm resistor at co-ordinate G0818R, replace this with a 9.31K ohm resistor. 2. If there is a 2.32K ohk resistor at co-ordinate G0518R, replace this with a 4.64K ohm resistor. 3. Replace the 1K ohm vertical character spacing potentiometer with a 2K ohm potentiometer at co-ordinates G0702R*, 4, Insert appropriate notes in the MDD construction file for element 3012 at lines 3012.005.0, 3012.008.0, and 3012.013.0. PARTS REQUIRED: 1 - 804026 Resistor, 4.64K ohm 1%, 1/2W. 1 - 804028 Resistor, 9.31K ohm 1%, 1/2W. _. 1 - 804213 Potentiometer, 2K ohm 20% 1/4W. ' REFERENCE: CA-601-3C FRIDEN, INC. San Leandro General Service Department FORM 73-169-SL KEEP THIS FILE Db a | NUMERICAL ORDER EFFICIENT SERVICE f id ELECTRONIC CALCULATOR 130. [xe Il ‘wal SERVICE LETTER i: es A FRIDEN PRODUCT 5-5-65 Page 1 of 3 TO ALL FRIDEN OFFICES SUBJECT: Keyboard Wiring Harness Color Code. REFERENCE: £Production Line Change. REASON: Effective with serial number EC130-4000, the Production . Department changed wire designations from numbered wire markers on each wire to individual color coded wires. INSTRUCTIONS: Retain the attached list for use while servicing the keyboard area. ey Colors are duplicated within some cables but due to the cable harness spacing, incorrect connections should not be possible. FRIDEN, INC. San Leandro General Service Department FORM 73-169-SL db PIN NO. 35 36 37 38 39 40 41 42 43 PIN NO. anNoaanrh wn re ee Youth wnrHo o KEYBOARD WIRING HARNESS COLOR CODE J CARD COLOR White - Black - Blue White - Black - Violet White - Red - Brown White - Red - Red White - Red ~ Orange Green (Unnumbered, connected to K card #17) White ~- Black - Blue White - Black - Violet White - Red - Brown | K CARD COLOR White White - Black White - Brown White - Red White - Orange White ~ Yellow White - Green White - Blue White - Violet White - Gray White - Black - Black White - Black - Brown White - Black - Red White - Black - Orange White - Black - Green Green (Numbered) Green (Unnumbered) (Over) PIN NO. 44 45 46 47 48 49 50 51 52 PIN NO. 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 EC~-130 Service Letter #11 Page 2 of 3 COLOR White - Red - Red White - Red - Orange Red (Unnumbered) Red (Unnumbered) White (Blank) Green (Numbered) Green (Numbered Green (Unnumbered) COLOR White White - Black White - Brown White - Red White - Orange White - Yellow White - Green White ~ Blue White - Violet White - Gray White - Black - Black White - Black - Brown White - Black - Red White - Black - Orange White - Black - Green Red (Unnumbered) Red (Unnumbered) EC-130 Service Letter #11 Page 3 of 3 PIN NO. pt be =) ree bo PIN NO. — anrtouw»rrh wnd ee wo =" OoOWMON OUP WN FE KEYBOARD WIRING HARNESS COLOR CODE KB CARD COLOR PIN NO. White 13 White - Black 14 White - Yellow 15 White - Violet 16 . White - Black - Brown he White - Black - Violet 18 White - Black - Red 19 White - Red - Orange 20 White - Black - Orange 21 White - Orange 22 White - Blue 23 White - Brown 24 DECIMAL POINT SWITCH PLUG COLOR PIN NO. White 11 White - Black 12 ‘Red 13 White - Brown 14 White - Red 15 White - Orange 16 White ~ Yellow 17 White - Green 18 White - Blue aS) White - Violet COLOR White - Green White - Gray White - Black - Black White - Black - Green White - Red White - Red - Red White - Red - Brown White - Black - Blue Green Green White Red COLOR White - Gray White - Black - Black White - Black - Brown White - Black - Red White - Black - Orange White - Black - Green White - Black - Blue White - Black - Violet White - Red - Brown r KEEP THIS FiuwED IN NUMERICAL ORDER EFFICIENT SERVICE e } id ELECTRONIC CALCULATOR 130° [xo I] etl SERVICE LETTER “s 5-20-65 A FRIDEN PRODUCT TO ALL FRIDEN OFFICES ‘ SUBJECT: EC-130 Logic Card Carrying Case. REASON: Experience has shown that a simple inexpensive carton would be advisable to hand~carry EC-130 logic cards to the customer's office. INSTRUCTIONS: EC-130 logic card carrying cartons will be shipped knocked down. Each package will contain four (4) outer cartons, two (2) plastic liners, and two (2) pads. The price of the outer carton is such that it can be thrown away when it becomes damaged. Retain the inside liner for use with extra outer carton. DO NOT USE THIS CARTON TO SHIP CARDS! The cartons are assembled as shown below. — ~, Push flaps in to lock ae DO NOT bend tab PARTS REQUIRED: , 800200 - Package of carrying cases. Contains: 4 cartons, 2 plastic liners, and 2 pads. FRIDEN, INC. oN San Leandro General Service Department FORM 73-169-SL KEEP THIS Fiueke DO tN NUMERICAL ORDER EFFICIENT SERVICE Page 1 of 2 } id ELECTRONIC CALCULATOR 130 [no [ | Cit SERVICE LETTER as A FRIDEN PRODUCT 7-1-65 TO ALL FRIDEN OFFICES. ' SUBJECT: EC-130 High Voltage Troubleshooting, REASON: Service records indicate that excessive difficulty is being experienced when problems occur in the high voltage section. INSTRUCTIONS: Troubleshooting procedure will vary, according to the malfunction encountered, A "dim display" complaint should be first checked by reducing the intensity until the display is barely visible, If the left half of the display is dimmer than the right, the DC restore diode is probably leaky. If the beginning of each segment is brighter than the last half or if there is a dot at the beginning of each segment with the last half of the segment dimmer, then the DC restore diode is open. } In either case, replace the DC restore diode regardless of any resistance measurement you may make across the diode. Another frequent reason for insufficient brightness is insufficient high voltage. This may be checked by measuring the DC voltage at point A of the attached schematic, A reading of -510V should be secured providing resistors are at or close to zero (0) percent tolerance, If this voltage is low, check the output of the a-stable, The A stable waveform should be a 2KC (500us) symmetrical wave- form of about 10 volts amplitude. A defective a-stable output, not oscillating or unsymmetrical oscillation, is one of the most common reasons for overheating of the 10 ohm 2W resistor, If the a~stable output is correct, check the output of the driver transistor at pin 7 on the power supply board. Waveform A is the correct output for this connection, Although any malfunction of the high voltage supply will cause distortion of this waveform, the most common defects are shown in waveforms B, C and D. Waveform B was caused by a leaking even-numbered diode, waveform C was caused by a leaking odd-numbered diode, and waveform D was caused by a shorted odd or even-numbered diode. The defective diode .Should be isolated by taking resistance measurements of the components involved, When looking at DC voltages over 600V, always connect a .005 mfd 3K V capacitor (#804098) in series with the oscill- oscope probe to protect the probe and oscilloscope circuitry. (Over) FORM 73-169-SL 560Nn 6.8K -047pf | ] | | I | 12 C C C C 12 14 2 1 D011 | J q t | | 1 mT | 010 Cc c Cc c 10 9 4 3 fay T T T | L } L ij | D8 Cc Cc Cc Cc ‘leg 7 6 5 D7 “T T T qT a (FRONT OF MACHINE EC-130 Service Letter #13 Page 2 of 2 RO} © © ‘ 7 =12V i 2N1305 COMPONENT LAYOUT 03 D4 D5 D6 @——wwn BLANKING AMPLIFIER 001pf 4) -—- 6.8K 18K +6V d12 ~~ 2N2043A O.C. -80V "CRT PIN 2 (GRID) ‘= ca 011351 | RESTORE DIODE -D11351 3 — cs c3 Desire 470K c1i0 cs IM 820K 820K 820K ea) 5 680K 500K FOCUS ooK Ss” y 4 Pale Pp NE-2 (=e ne-2 (=e) — ie ne-2 (52) CRT PIN 3 Sy -005yf 3KV L CRT PIN 4 (FOCUS ANODE) @) —+—{A) (-510voc) ; ; g Wr KEEP Tobls et bie & IN NUMERICAL ORDER EFFICIENT SERVICE 7 Frid ay | ELECTRONIC CALCULATOR 130. Ro hdc SERVICE LETTER - A FRIDEN PRODUCT ; 7-16-65 TO ALL FRIDEN OFFICES SUBJECT: Soldering of Friden Etched Circuit Boards. REASON: Experience has shown that an explanation of soldering technique is advisable. INSTRUCTIONS: Soldering is an alloying process between two metals, In its molten state, solder chemically dissolves some of the metal with which it comes into contact. However, ‘the metals to be soldered, are, more often than not, covered with a thin film of oxide that the solder cannot dissolve. A flux must be used to remove this oxide film from the area to be soldered, The solder used in most electronic work con- Pe tains this flux as a center core which has a lower melting point than solder itself. The flux in its molten state cleans the metal and holds the oxides suspended in ‘solution. The molten solder can then make contact with the cleaned metal and the solvent action of solder on metal can take place. The soldering process then is the following: 1. The cored flux melts first and removes the oxide film on the metal to be soldered. ‘ 5 . 2. ‘The solder melts, floating the lighter flux and the impurities suspended in it to the surface. 3. The solder dissolves some of the metal in the connection. 4, The solder cools and fuses with the metal. To do a proper soldering job the following must be done: wy The connection itself must become hot enough for the rosin to melt and clean the metal. 2. The cored solder must be applied directly to the heated connection so that the flux, which melts at a lower temperature than the solder, will melt first and clean the connection by the time the solder has ‘melted. (If the solder is applied to the soldering-iron tip, the flux, being lighter, will float on top of the solder, It will be unable to reach the connection and clean it.) FORM 73+169-SL_ : (Over) EC-130 Service Letter #14 Page 2 of 3 3. A good easy flow of heat from the soldering-iron tip to the connection must be obtained by a clean, well-tinned soldering-iron tip. A thin film of molten ‘solder will transfer heat rapidly. In soldering techniques for etched circuit boards, the basic principles for soldering prevail. We are now interested in the difference in the soldering of etched circuit. boards and normal soldering. The first consideration of soldering to etched circuit boards is the limitations of the substrate of the boards. The Friden etched circuit boards have a substrate of fiber-glass epoxy which-has a temperature limitation of 600 F for not more than 7 seconds. Hotter temperatures reduce the tims in inverse relationship; the hotter the temperature, the less time the boards will stand it before damage. (As an in- dication of damage, white flakes will first appear in the surface of the board. These white flakes indicate a decomposition of the fiber-glass epoxy substrate. ) ‘ A second consideration is the soldering-iron-tip temperature, which is determined by the type of soldering iron and soldering-iron tip used. The wattage of the soldering iron and the configuration of the soldering-iron tip combined with the speed of soldering will determine the ultimate tip temperature as well as the working-tip temperature. Since we are here primarily concerned with the working tip temperature, the soldering iron and tip should be chosen so that the working tip temperature will at no time exceed the limitations of heat set forth above.- An Oryx soldering iron, Model 115-15W, is recommended, (Friden Tool #T18702 with Tip #T18703.) A third consideration in soldering of etched circuit boards is the type of solder used, The best type for use on the Friden etched circuit boards is a "eutectic"-type cored- wire solder of size #20 AWG, composed of 60% tin and 40% lead with a central core of activated rosin flux. (Friden Tool # T18704.) The fourth consideration is the technique of repair - repair in this case consisting of replacement of components. Carelessness in reheating the solder connections for the removal and replacement of components is the only difficulty to be guarded against here, Caution must be taken not to overheat the substrate and this can best be accomplished with deft hands and by small applications of heat, If the removal or replacement is not accomplished in the first few seconds of heat .applicatio