Bell System Practices Plant Series Manuals

( ( ( ( ( J ( BELL SYSTEM PRACTICES Plant Series SECTION 573-127-700 Issue 3, November, 1963 AT&TCo Standard 28B AND 28C TRANSMITTER-DISTRIBUTOR UNITS REQUIREMENTS AND ADJUSTMENTS CONTENTS 1. GENERAL 2. REQUIREMENTS AND ADJUST- MENTS . . Q • • • • • • • • • • • • • • • • • • • • • • . Cam Shafts (28B Unit) Cam-shaft bearing retainer • • • • • • Cam-sleeve endplay • • • • • • • • . . • . Idler gear assembly • • . . • • • • • • • • Cam Shafts (28C Unit) Cam-shaft bearing retainer • • • • • • Cam-sleeve endplay • . . • • • • • • • . Idler gear assembly • • . . • • . . . • • • Clutch Mechanism Clutch-shoe lever . . • . . • . . . . . • • • Clutch-shoe lever spring • • • • • • • Clutch-shoe spring . . • . . . • . . . • • • Clutch trip lever upper extension • • Clutch Trip Mechanism Armature-bail spring • . . . • . • . • • • Clutch armature airgap • • . . • . • • • Clutch trip assembly mounting plate ......................... . Clutch latchlever spring . • . . . • • • Clutch triplever spring • • . • . • • • • Magnet bracket o • • • • • • • • • • • • • • • Contact Timing Requirements for Fixed Sensing Head (28B Unit) Distributor contacts - stop and No. 1 through No. 5 • . . • • . • . • • • • Storing switch auxiliary and clutch-trip contacts • . . • . • . • . • • . Storing switch contacts No. 1 through No. 5 • . . . • . . • 0 • • • • • • 0 • Contact Timing Requirements for Pivoted Sensing Head (One- cycle Cam) Distributor auxiliary contacts . • • • PAGE 3 4 4 4 4 5 5 5 9 8 8 9 6 6 6 7 7 7 45 46 46 42 CONTENTS Distributor contacts - stop and No. 1 through No. 5 • • . • . . • • • • . • Storing switch auxiliary, tape-out, and clutch-trip contacts • • • • • • • • • Storing switch contacts No. 1 through No. 5 • • • . . . . . • • • . • . • . • • • Cover Plate Mechanism (28B Unit) Cover plate • • . . • . • . • . • . • . • • • • • • • Cover-plate detent spring • • • • • • • o Distributor Contact Mechanism Camfollower-lever spring • • • • • • • • Distributor block assembly • • • • • • • Distributor camfollower guide • • • • Distributor contact gap • • • • • • . • • • • Distributor rocker-compression springs ........................ . Feed Lever Feed-lever set collar . . . . . • • , • • • , Feed-lever spring (fixed head) · (28B unit) . • . . . . . . . . • . . . . . • • . . . . . Feed-lever spring (pivoted head) • • Fully Enclosed Last-character Contact Switch Last-character contact assembly ...................... . Last-character contact spring • • . • Oil Reservoir . . . . . . . . • . . . . . . . . . . • • Pivoted Sensing Head Check pawl .................... . Check pawl spring . • . . . • . • . • . . . . . Feed pawl (final) . . . . . . . . . . . . . • . . Feed pawl (preliminary) . . . • . . . . . . Sensing head pivot screws ....... . Tape deflector . . . . . . . . . . . . • . . . . . Tape-deflector bracket .......... . Tape-retaining lid latch ......... . Top plate . • • • . . . • . . . . . . . . . . • . • • . PAGE 42 43 43 22 22 10 11 10 11 10 12 12 12 35 35 26 31 31 31 31 30 30 30 32 32 © American Telephone and Telegraph Company, 1963 Printed in U.S. A. Page 1

( (' ! ( ( ( , 1 i ( t BELL SYSTEM PRACTICES Plant Series SECTION 573-115-700 Issue 7, July, 1966 AT&TCo Standard 28 TYPING UNIT ADJUSTMENTS CONTENTS PAGE 1. GENERAL ................ . 5 UNMOUNTED POSITIONS OF TYPING UNIT . . .... .. . ...... . 6 OPERATING CONDITIONS OF CLUTCHES .................. 6 MANUAL SELECTION OF CHARACTERS OR FUNCTIONS. . . . . 6 VARIABLE FEATURES . . . . . . . . . . 7 EARLIER DESIGN MECHANISMS . . . 7 COMPLETE ADJUSTMENT OF TYPING UNIT . . . . . . . . . . . . . . . . 7 2. BASIC UNITS. . . . . . . . . . . . . . . . . 8 Code Bar Mechanism Code bar detent . . . . . . . . . . . . . . . 70 Code bar detent spring . . . . . . . . . . 70 Code bar shift lever link bracket. . . . 22 Code bar shift lever drive arm . . . . . 21 Code bar yield spring . . . . . . . . . . . 70 Common transfer lever spring . . . . . 19 Intermediate arm backstop bracket . . 20 Transfer lever eccentric . . . . . . . . . 19 Transfer lever spring . . . . . . . . . . . 19 Function Mechanism Figs - ltrs shift code bar operating mechanism . . . . . . . . . . . . . . . . . . 38 Function bar spring . . . . . . . . . . . . 59 Function contact spring . . . . . . . . . . 68 Function lever spring . . . . . . . . . . . 59 Function pawl spring. . . . . . . . . . . . 59 Function reset bail blade . . . . . . . . . 37 Function reset bail spring . . . . . . . . 37 Keyboard lock lever spring . . . . . . . 46 Stripper blade drive cam position . . . 62 Stunt box clip. . . . . . . . . . . . . . . . . 60 Unshift-on-space function pawl . . . . . 69 CONTENTS PAGE Line Feed and Platen Mechanism Left margin (sprocket feed) . . . . . . . 73 Line feed bar bell crank spring .... 61, 76 Line feed bar release lever spring . . 61 Line feed clutch phasing . . . . . . . . . 31 Line feed spur gear detent eccentric . 61 Line feed stripper bail spring. . . . . . 63 Paper finger (friction feed) . . . . . . . 67 Paper finger locking arm spring (sprocket feed). . . . . . . . . . . . . . . . 77 Paper finger or guide bracket (sprocket feed). . . . . . . . . . . . . . . . 7 5 Paper finger or guide bracket latch spring (sprocket feed) . . . . . . . 77 Paper finger or guide bracket shaft spring (sprocket feed) . . . . . . . . . . . 77 Paper . finger spring (friction feed) . . . 67 Paper guide (sprocket feed) . . . . . . . 76 Paper pressure bail spring (friction feed) . . . . . . . . . . . . . . . . 67 Paper straightener collar (friction feed) . • . . . • . . . • . • . . . . 66 Paper straightener lever spring (friction feed) . . . . . . . . . . . . . . . . 66 Platen detent bail spring . . . . . . . . . 61 Platen end play (sprocket feed) . . . . . 7 4 Pressure roller lever spring (friction feed) . . . . . . . . . . . . . . . . 67 Printing hammer stop bracket (sprocket feed). . . . . . . . . . . . . . . . 7 3 Printed line (sprocket feed) . . . . . . . 7 4 Right margin (sprocket feed) . . . . . . 73 Single-double line feed stripper bail assembly springs . . . . . . . . . . . 64 Sprocket pin separation (sprocket feed). . . . . . . . . . . . . . . . 74 Sprocket pin spring (sprocket feed) . . 76 Main Shaft and Trip Shaft Mechanisms Clutch drum position (except selector). . . . . . . . . . . . . . . . . . . . 29 Clutch latch lever spring (except selector). . . . . . . . . • . . . . . . . . . . 23 Clutch shoe lever . . . . . . . . . . . . . . 28 Prepared for American Telephone and Telegraph Company by Teletype Corporation © 1953 and 1961 by Teletype Corporation All rights reserved. Printed in U.S. A. Page 1

('" ( ( '•. ( ( ( ( BELL SYSTEM PRACTICES Plant Series SECTION 573-106-702 Issue 3, April, 1964 AT&TCo Standard 28 MULTIPLE-MOUNTED TRANSMITTER-DISTRIBUTOR SETS (SINGLE-CONTACT AND MULTICONTACT} DISASSEMBLY AND REASSEMBLY 1. GENERAL 1. 01 The disassembly procedures presented in this section, together with those given in the section on general requirements for disas­ sembly of teletypewriter apparatus, will sepa­ rate the single-contact and the multicontact mul­ tiple-mounted transmitter-distributor sets into their major subassemblies. 1. 02 This section is reissued to add disassem- bly procedures for the single-contact mul­ tiple-mounted transmitter-distributor set and to change the title accordingly. 1. 03 For disassembly routines for the trans- mitter-distributor units, refer to the sec­ tions on disassembly of the 28H (for single­ contact) and 28G (for multicontact) transmitter­ distributor units. 1. 04 To reassemble, reverse the disassembly procedures. Where additional informa­ tion is required, a Reassembly Note is added . . 2. DISASSEMBLY A. Single-contact Multiple-mounted Transmit­ ter-Distributor Set 2. 01 Transmitter-Distributor Unit: To remove the units from the base, remove the cover­ plate. Open the hinged panel on the front of the dust cover. Loosen the two screws on the lock­ ing device at the right rear corner of the trans­ mitter-distributor unit and slide the locking de­ vice to the left. Remove the mounting screw at the front of the unit which secures the unit to the base. Lift the unit out of the cover. Reassembly Note: To reassemble the unit on the base, reverse the disassembly pro­ cedure. Position each unit from left to right so that there is barely perceptible gear play. Tighten the three mounting screws. 2. 02 Dust Cover: To remove the dust cover from the base, lift up. B. Multicontact Multiple-mounted Transmit­ ter-Distributor Set 2. 03 Cover: To remove the transmitter-distri­ butor unit from the multiple base, first remove the cover, as follows: (1) Open the hinged front portion of the cover to provide access to each transmitter­ distributor and its attached cradle. Lift off the coverplate. Remove the clamp screw that anchors the cradle in its slide, then lift up­ ward and pull-forward to disengage the unit. (2) Lift the cover upward and move toward the front. 2. 04 Transmitter-Distributor Unit: To remove the transmitter-distributor unit from the cradle, proceed as follows: (1} Remove the two screws and lockwashers which secure the plug connector to the cra­ dle. Reassembly Note: When the screws are re­ piaced, make sure that the head of each screw is on the outside of the cradle. (2} Remove the two screws and lockwashers that secure the casting to the rear projec­ tion of the cradle. Remove the screw, lock­ washer, and nut that secure the casting to the front projection of the cradle. Note that the bushing is mounted with its hex head on the top side of the casting. f (3) Remove the screw, lockwasher, and flat washer that secure the tape deflector to the top plate and the screw, lockwasher, and flat washer that secure the right end of the tape deflector assembly. (4) Remove the filler-plate mounting screws. Reassembly Note: Reassemble in the re­ verse order, taking care not to damage the cable, cable connector, or switches. 2. 05 Base: To disassemble the transmitter­ distributor base, proceed as follows: (1) Remove the motor mounting screws with­ out disturbing the shaft height unnecessar­ ily. ( 2) Disassemble the left end of the counter shaft assembly by removing the screw, together with its lockwasher and flat washer, which threads through the hub collar into the side of the shaft. Then remove the screw, together with its associated lockwasher and flat wash­ ers, which threads through the hub into the end © American Telephone and Telegraph Company, 1964 Printed in U.S. A. Page 1 •\�

(' ( I ( ( ( ( ( BELL SYSTEM PRACTICES Plant Series 28 REPERFORATOR-TRANSMITTER SET DISASSEMBLY AND REASSEMBLY SECTION 573-104-702 Issue 1, April, 1964 AT &reo Standard 1. GENERAL 1. 01 This section describes the method for dis- assembling the 28 reperforator-transmit­ ter set and stand. Where necessary, it also describes the method used to reassemble the equipment. For additional information refer to the section covering the general disassembly and reassembly instructions. (2) Disconnect all plugs from their connectors located on the frame of the reperforator­ transmitter stand. (3) Loosen the three captive screws that se­ cure the unit to the stand. ( 4) Lift the unit from the stand. B. 28A Reperforator-Transmitter Stand 2. DISASSEMBLY AND REASSEMBLY A. 28 Reperforator-Transmitter Set 2. 01 To disassemble a 28 reperforator-trans­ mitter set, remove the 28 reperforator­ transmitter unit from the 28A reperforator­ transmitter stand as follows: (1) Remove the tape-winder drive belt from the tape-winder drive pulley. Note: Before proceeding with the disassem­ OlfOf the stand, remove the tape-supply and take-up reels and the intermediate tape stor­ age bin. After reassembly, route the tape as shown in Figure 1 ana thread the tape onto the tape winder reel, fold the end of the tape, and insert it, chad side up, into the slot in the right-hand reel core. QUARTER TWIST CLOCKWISE QU ARTER TWIST CLOCKWISE OR COUNTER -CLOCKWISE " TAPE S U P P LY ARM HALF TWIST CLOCKWISE OR COUNTER-CLOCKWISE ,,.;."', '-t:�i.::--�\1 TAPE ARM '-"! PIVOTED SENSING HEAD :_;-cc �-:�---c_�� TAPE SUPPLY REEL / �,, \/-- / / __ ...,_ / / / � I / I \I / " \ TAPE WINDER REEL \ 1 't I // I I I I I I I I I I ,�

TCI Library https://www.telephonecollectors.info/ BELL SYSTEM PRACTICES Plant Series SECTION 502-150-901PT Issue B, January, 1967 Pacific Tel. DIAL-IN-HANDSET F-56593 TELEPHONE HANDSET AND F-56594 TELEPHONE BASE IDENTIFICATION, INSTALLATION, CONNECTION, AND MAINTENANCE Contents Page 1. GENERAL 1 2. DESCRIPTION . . . • • • . • . . • • • • • • • • • • • 1 F-56593 Telephone Handset .•••••••• F-56594 Telephone Base ......•.•.. 3. INSTALLATION .•.••..•.....•••.••. AC and DC Power Supply .•.••.•••• Single Installations .•••••••••••••••• Multiple Installations .••••••••••••.• Lamp Circuit Modification .•••.•.•.• 1 3 3 7 7 8 8 4. MAINTENANCE . . . • • • • • • • • • • • • • • • . • 10 Transmission. • . • • . • • • • • • • • . • • • • • . • 10 Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Ringer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Dial Lamp and Recall Relay . • . • . . • 11 Cords . . . . • . • • • . . • . • . • . • • • . . • . . . • . • 11 5. CONNECTIONS • • • • • • • • • • • • • • • • • • • • 11 1. GENERAL 1.01 This s e ction covers the installation and m a intenan c e o f the "TWO PIECE" Dial- In-Handse t t elep hon e (Fig . 1), which is simi- lar to the F-56171 Dial-In-Handset. 1.02 It i s rei s sued to d elete all r e fe r ences to portable type installations. Since this r eissue cover s a general revision, marginal a r r ows ordinar ily use d to indicate changes hav e b een omitted. 1.03 This hands et is design ed prima rily for us e in hospitals and othe r s i m ilar in- stitutions. However , it may b e installed e ls ew here. Note: Do not confuse thi s handset with TRIM LINE t e l ephon e s et s . 1.04 The Dial-In-Handset is intended for wa ll installation only. F-56593 ....+-a-- -- TELEPHONE HANDSET F-56594 m---- TELEPHONE BASE F-56594 Telephone Base With F-56593 Telephone Handset Fig. 1 2. DESCRIPTION F-56593 Telephone Handset 2.01 E lectrically, the F - 565 93 Handset is a complet e t e l e p hon e ex cept fo r r inger and switc h hook fun ctions. It consists of the following components: • LAI r e c eiver unit. • T 1 transmitter unit. © The Pacific Telephone and Telegraph Company, 1966 Printed in U.S.A. Page l

BELL SYSTEM PRACTICES Plant Series SECTION 529-226-113 Issue 1, September 1968 AT & TCo Special TELEPHONE SETS-2626A 1 IDENTIFICATION, INSTALLATION, OPERATION, CONNECTIONS, AND MAINTENANCE 1. GENERAL 1.01 The 2626A1 telephone set (Fig. 1) is intended solely for use with specially engineered lines-not for general telephone use. 1.02 Information contained in this section was formerly found in Section 502-626-100, which is canceled. 2. IDENTIFICATION PURPOSE This set is intended for use with Switching System No. 307 and is arranged for TOUCH-TONE® dial calling on 2- or 4-wire lines. ORDERING GUIDE Set, Telephone, 2626A1-3 Note: Set is available in black (-03) only. Fig. 1-2626A 1 Telephone Set (a) Replaceable Components (Fig. 2 and 3) • Buzzer, KS-8109L2 • Cord, Mounting, D120F-3 • Dial, 22D3 • Faceplate Assembly, 220A1-78 • Components of 220A1-78 Faceplate Assembly P-20F627 Mat (silver) P-20F640 Faceplate • Key, 598A • Key, 599A • Lamp, 51A • P-27E737 Relay Assembly (FW and PC) • P-44E508 Bezel Fig. 2-2626A 1 Telephone Set, Cover Removed © American Telephone and Telegraph Company, 1968 Printed in U.S.A. Page 1

BELL SYSTEM PRACTICES Plant Series SECTION 512-115-100 Issue 4, October 1970 AT&TCo Standard KS-16844 RAP/DIAL IDENTIFICATION, INSTALLATION, OPERATION, CONNECTIONS, AND MAINTENANCE 1. GENERAL 1.01 This section covers identification, installation, operation, connections, and maintenance of KS-16844, List 1 and List 10 Rapidials. 1.02 This section is reissued to: eEliminate foldouts Fig. 13, and Table F eRearrange text for clarity einclude 1013A test set and show 1011B test set MD. 1.03 Authorization to connect a Rapidial to a switchboard must be obtained from the local operating company. 1.04 The KS-16844 Rapidial is rated MD. 2. IDENTIFICATION 2.01 The KS-16844 Rapidial (Fig. 1 and 2) is a magnetic-type repertory dialer used in conjunction with a customer telephone set. It records, stores, and transmits dial pulses. 2.02 Connecting a Rapidial to the telephone set will not affect the normal operation of the telephone. For ease of operation, the Rapidial should be located near the telephone set. 2.03 Cord connections are required between the telephone set and the Rapidial and between the Rapidial and the low-voltage power supply. The power supply (List 2) is shown in Fig. 3 and 4. 2.04 Rapidial provides writing space for the entry of 290 names and telephone numbers on a revolving tape. A scan knob on the right side of the machine is provided for manual rotation of tape. The List 10 Rapidial has a motor-driven tape for rapid scanning. 2.05 Names and numbers are written on the tape with a lead pencil so changes can be made, if required, by erasure. Instruct subscriber to use kneadable eraser to prevent eraser residue from darkening tape. 2.06 The dial on the Rapidial unit is used only to record numbers on the tape and is inoperative (locked), when the unit is not in recording condition. 2.07 The list numbers for the components are: (a) KS-16844, List 1 Rapidial includes: eList 3-Power Supply Cord (4 conductors, 8 feet long)• eList 4-Telephone Cord (6 conductors, 8 feet long)' eList 6-Tape Assembly (Manual) (b) KS-16844, List 10 Rapidial includes: eList 3-Power Supply Cord (4 conductors, 8 feet long)' eList 4-Telephone Cord (6 conductors, 8 feet long)' eList 12-Tape Assembly (Power Driver) (c) Housings are not included with the List or List 10 Rapidial. They may be ordered separately as required. eList 20-Housing Green (-51) eList 20-Housing White (-58) eList 20-Housing Beige (-50) @ American Telephone and Telegraph Company, 1970 Printed in U.S.A. Page 1 BSP 512-115-100-i04_1970-10-0l.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Apr 29, 2012 21:41:27

BELL SYSTEM PRACTICES Plant Series SECTION 512-115-100 Issue 2, May, 1964 AT&TCo Standard KS-16844 RAPIDIAL 1. GENERAL 1. 01 This section covers identification, operation, installation, connections, and maintenance of KS-16844, List 1 Rapidial and the KS-16844, List 10 Rapi- dial. 1. 02 This section is reissued to: •Add information on the power- driven scan (List 10) •Show connections for various type switchboards. 1. 03 List 1 units may be returned to the distributing house for modification to List 10 units. 1. 04 Switchboard connections and ordering information is covered in 7 and shown in Table C. WRITING TAPE RELEASE START INSTRUCTION 2. IDENTIFICATION 2. 01 The KS-16844 Rapidial (Fig. 1 and 2) is a magnetic-type repertory dialer used in conjunction with a customer tele- phone set. It records, stores, and trans- mits dial pulses. 2. 02 Connecting a Rapidial to the telephone set will not affect the normal oper- ation of the telephone. For ease of oper- ation, the Rapidial should be located near the telephone set. 2. 03 Cord connections are required be- tween the telephone set and the Rapidial and between the Rapidial and the low-voltage power supply. The power supply (List 2) is shown in Fig. 3 and 4. 2. 04 Rapidial provides writing space for the entry of 290 names and telephone numbers on a revolving tape. A scan knob TIME DELAY BUTTON LIST 4 TELEPHONE LIST 3 POWER J SUPPLY CORD Fig. 1 - KS-16844, List 1 Rapidial ~ American Telephone and Telegraph Company, 1964 Printed in U.S. A. Page 1 TCI Library: www.telephonecollectors.info

BELL SYSTEM PRACTICES Plant Series SECTION 502-543-406 Issue 1, May 1970 AT&TCo Standard SERVICE 2565LK TELEPHONE SETS 1. GENERAL 1.01 This section provides maintenance and connection information for the 2565LK telephone sets. Maintenance information was formerly found in Section 502-525-125. Connection information was formerly found in Section 502-525-437 which is hereby canceled. 2. MAINTENANCE Replaceable Components 2.01 Field replaceable items are listed under Ordering Guide in the appropriate Reference section in Division 502. Loose Card Retainers 2.02 Current production sets are equipped with P-25E803 and P-269561 card retainers, which cannot be adjusted. 2.03 If P-25E785 (MD) card retainer becomes so loose on the faceplate that the number card or designation strip slips, they can be tightened as follows: (1) Remove faceplate from set. (2) Remove card retainer from faceplate. (3) Bend the four arms of the retainer so that more pressure will be applied to the number card and designation strip. The bends should be made approximately 1/2-inch in from the tabs on the ends of the arms and in the opposite direction from the factory bent tabs. (4) Install the card retainer on the faceplate and insert the number card and designation strip. (5) Install faceplate on telephone set. Note: If adjusting the arms of the retainer does not result in sufficient holding power, replace the card retainer. Housing 2.04 When removing or replacing housing, guide lower front of housing over pushbuttons. On sets equipped with exclusion, pull exclusion plunger up to its operated position before removing housing. Plunger should also be in upper position when replacing housing. With housing in place, operate plunger several times to insure proper operation. Lamps and Pushbuttons 2.05 Replace cracked pushbuttons or collar assemblies. Plastic parts may be cleaned with a water dampened cloth. DO NOT USE SOLVENTS. Lamps should be near associated pushbutton with contact surfaces aligned for maximum illumination. 2.06 To replace defective lamp. (1) Remove button and collar assembly. (2) Gently pry lamp from socket with KS-6320 orange stick. (3) Replace lamp, making sure that contact surface on lamp and socket meet. (4) Replace button and collar assembly. Keys—589-Type 2.07 Key contacts may be cleaned using a 265C tool, or adjusted using a 363 tool. When adjusting springs: (a) There should be a minimum clearance of 1/64-inch between contact springs and those parts of the key which do not make contact. (c) American Telephone and Telegraph Company. 1970 Printed in U.S.A. Page 1