Manual / Guide · 1957
BSP 572-008-201 Installation of TP97301 Filter Unit
BSP 572-008-201, *Installation of TP97301 Filter Unit for Line Relay Contacts of 14 Teletypewriters and Typing Reperforators*, Issue 2, Oct 1957
Manual / Guide · 1957
BSP 572-008-201, *Installation of TP97301 Filter Unit for Line Relay Contacts of 14 Teletypewriters and Typing Reperforators*, Issue 2, Oct 1957
BELL SYSTEM PRACTICES Plant Series SECTION 572-008-201 Issue 2, October, 1957 AT&TCo standard INSTALLATION OF TP97301 FILTER UNIT FOR LINE RELAY CONTACTS OF 14 TELETYPEWRITERS AND TYPING REPERFORATORS 1. GENERAL (6) Replace the leads removed from the old resistor on the corresponding terminals of the new resistor as follows: 1. 01 This sectionfurnishes information for the installation of the TP97301 filter unit on a 14 teletypewriter base. 1. 02 This section is reissued to bring the code number of the unit up to date. 1. 03 The TP97301 filter unit supersedes the 92228M filter unit. It is designed for use with 14 teletypewriters and typing reperforators equipped with either holding magnet selectors or pulling magnet selectors. The function of this filter unit is to suppress radio frequency induction from the line relay contacts of these machines. 1. 04 The TP97301 filter unit consists of one filter assembly, one TP7 4614 resistor (2000-600 ohm) and two TP97291 mounting screws. (a) Connect the short black lead· and the green lead to the outside terminal. (b) Connect the long black lead to the middle terminal. (c) Connect the yellow lead to the inside terminal. (7) Lower the relay baseplate to its original position and remount it with the two TP1253 screws. 2. 02 Refer to Figure 1 and connect the filter as follows: 2. INSTALLATION (1) Unsolder the lead connected to relay terminal 4 and connect it to the upper terminal of the filter resistor 4. 2. 01 Install the TP97301 filter unit as follows: (2) Unsolder the lead connected to relay terminal 5 and connect it to the upper terminal of the filter resistor 5. (1) Remove the two TP1253 relay-baseplate mounting screws and move the relay baseplate upward and toward the rear. (3) Connect the short lead from the lower terminal of filter resistor 4 to terminal 4 of the relay connecting block. (2) Remove the two TP55344 resistance mounting block mounting screws and install the filter bracket on the rear of the TP71670resistance mounting blocks securing the filter bracket with the TP97291 screws. Tighten the mounting screws. (3) Position the base cable in the filter bracket notch. ( 4) Unsolder all the leads on the TP75436 (2000-1 000 ohm) resistor. This resistor has green and black leads connected to the terminal nearest the edge of the base. (5) Replace the TP75436 resistor with the TP74614 resistor furnished, placing the 600-ohm end toward the edge of the base. (4) Connect the short lead from the lower terminal of filter resistor 5 to terminal 5 of the relay connecting block. (5) Connect the condenser lead 3 to terminal 3 of the relay connecting block in which the line relay is operated on neutral signals. If the line relay is to be operated on polar signals with the two relay windings in series, connect the filter condenser lead 3 to terminal 2 of the relay connecting block. (6) Connect the two filter leads marked 1 to terminal 1 of the relay connecting block. (7) Check the connections of the filter with Figure 1. © American Telephone and Telegraph Company, 1957 Printed in U. S. A. Page 1 SECTION 572-008-201 TP 97301 FILTER UNIT 118A-400w G EXISTING WIRING I BK O.IMF BK ~TO (RI) --r----) Y OR BK RES. EXISTING WIRING DISCONN. FROM TERM. 5 (CB2) CONN. BLOCK 16 jO 17 10 1 a .0 I MF /FRAME GRD 41 ~--~ .............1 (CB2) EXISTING WIRING 01 SCONN. FROM TERM 4(CB2)CONN.BLOCK Ll N E RELAY CONN. BLOCK 255A RELAY BL BR OR BK __ WI RES FURNISHED .___ WITH FILTER UNIT Figure 1 Page2 2 Pages I J ---L---- TO (TS 3) TERMINAL STRIP