BELL SYSTEM PRACTICES Plant Series

Transcription

1 BELL SYSTEM PRACTCES Plant Series SECTON 58469MS ssue B, August, 963 M. S. T. & T. Co. CON COLLECTOR TELECART dentification, nstallation and Maintenance. DENTFCATON. The Coin Collector Telecart consists of a coin collector and a telephone set built into a portable cabinet, for use by convalescent and bedridden patients in military hospitals and convalescent homes.. 2 The telecart is provided with a fiftyfoot cord which can be plugged into standard tele phone jacks, and is equipped with special mercury switches to prevent unauthorized return of coins.. 3 The cabinet, illustrated in Figure, has a frame of extruded aluminum, and side and top panels of gray laminated plastic. The wheels are equipped with heavyduty ball bearings for easy rolling.. 4 The Coin Collector is concealed in a front compartment of the cabinet. The coin slots (A) project above the top and the coin return pull bucket (B) projects through a hole in the door of the compartment. Operation of button (C) depresses the switchhook to release a nickel held by the holding latch. A coin release button (D) in the front panel is used to release coins wedged in the coin slots. A frame (E) for an instruction card is provided on top near the coin slots. FGURE Coin Collector Telecart Front View Page TC Library

2 SECTON 58469MS. 5 The reverse side of the cabinet contains two compartments: one to store the extension cord, the other to mount the control equipment illustrated in Figures 2 and 3. Equipment is mounted on the inside of the door, the left side panel and the rear panel of this compartment. The door is equipped with a regular upper housing lock from a coin collector.. 6 The parts list is shown in Table. FGURE 2 Coin Collector Telecart Equipment Co mpartment TABLE TELECART, COLLECTOR, CON PARTS LST Page 2 QUAN ft. NAME Switch, Mercury, G. E. 252 KRO, or equivalent SC K. T. U. (Key Telephone Unit) 8A K. T. U. U 3 Covers Relay, Ul 245 Relay, Yl7 Relay, Amperite, 26C2 Socket, Tube, Amphenol 77MP8, or equivalent 42A CONN BLK 44A CONN BLK Batteries, KS7889 Resistor, KS849, Ll, 47 ohms, 5% watt or equivalent (Figure 7) Lock, Coin Collector, OH. (Figure 2) Collector, Coin, 2 33GR 3 (Figure 6) Set, T e lephone, 5 DR 6 (Figure 4) Cord, D6AA6 l, 9Ft. (Figure 4) Cord, l 8Ga., 4 Cond., Type SO (6V), WhitneyBlake 5722, or equivalent (Figure 7) Plug, 283B9 (Figure 7) T elecart, Model 23C. Frame, Card, P l 4E388 TC Library

3 SECTON MS MERCURY,..._...,. SWTCH 53 8C KTU /w U t '245 RELAY "J (C) U3 COVER C, ac KTU Y 7 RELAY ] U3 COVER,Q AMPERTE@ Tl MER. 26C'2 77MP 8 4'2A /':i\ CONN ~ BLOCK. MERCURY,..._...,. SWTCH 54 TERMNAL LUGS CABLE. HOLE. 44A CONN BK. C C, SAK.TU CONN BK. 3 KS7889 r BATTERES 46!i V (A) (B) (C) 46.SV 46.SV 46.SV NSDE OF DOOR LEFT SDE PANEL RE.AR. PANEL FGURE 3 Equipment Compartment Page,3 TC Library

4 SECTON 58469MS 2. NSTALLATON 2. The telecart is shipped ready for service except for the following minor operations: (a) nstall instruction card in frame provided in top of cabinet. (b) Connect battery by attaching wire to ter minal of the 44A connecting block. This wire is left detached to avoid draining the battery in case of accidental operation of the mercury switches during shipping. There is normally no drain on the battery except intermittently when the telephone is in use. (c) Plug cord into standard telephone jack. 3. CRCUT DESCRPTONS, TESTS AND MANTENANCE 3. 2 The 5 type telephone used with the Telecart is modified as follows: a. Rewired as illustrated in Figure 4. b. Cord replaced with D 6AA6 cord, 9' long. The ringer is connected in the regular manner The Tele cart is equipped with a 233GR coin collector modified as follows: a. Dial and handset and associated wiring removed. b. Upper housing rewired as shown in Figure 6. c. Coin relay modified as shown in Figure 5 below. 3. Refer to appropriate sections of BSP' s for instructions on maintenance of the coin collector and telephone set..5tandard MOD/Fl~O n ra.f WDQ wo4 FGURE 5 Modification of Coin Relay Spring Assembly Page 4 TC Library

5 SECTON 58469MS 44A CONN BLOCK ~~{: LL C ~"{: ~ CORD (D6AA6) ~DDEO LEAD. :r~~ ~t oll /G \lk n... : L 2... ~,~F~ ; ' 6._L++:J.% ;:; r O ~ ~ o/ 7 DAL.. za ' T ~~ rl, u~ ~~ /\N< ) GN l ~~ >;.J RR, ~ U) ~ ""\.!2ilr ~ ~,7 ~ ~ > ; b SL SR d_ w r+ e ~ ~ w \. SL._R, o ++t.. ~~, "c ' ~ N, 6 R, s L BK ~ +r f) L_ / j 9 ~ w ' w R (. / BK tga HANDSET a tc ::i: FGURE. 4 5 D TYPE TELEPHONE. MOD Fl ED FOR USE W TH TELE CART Page 5 TC Library

6 uj T z R l o UC) :::, '<;f... Oa. 'o:;t CD U)rn (J) (X) UJN 4 COND z ri. TYREX ~o CA T (GREEN)...l.. G,. )...,..._ 3 6 ~ :x: u 3: ct l/) ~ ~ 4~ 45 R (RE:D) 'p""' N}.() ct ' :::, NU r~ ( G (WHTE) Tl G BLACK) 52 r =27 6 _ t 2...,, 3 4 l 3 4 5T,.) "' Pr 3 6T.... ~ ( p T V V PT ll'\... ) z o o... ~!i ~ 5 _, o '2 ~~, L j (A) U '245 (NORMALLY CLOS&D) ~; ~ SEE NOTE 2 NOTE5: S o, T }TO 5 TYPE. _. L TELE.PHONE r~ 4 7 g_ 2 s' ( FGURE 4) _.,,,,,Y 7 a 3? / «_8 5T.!!! D.2 c 4B.t, 3 :? _, ri ', 3 L.J (B) Y7,~ (NORMALLY OPE.N) 53 ~. BEWARE OF HGH VOLTAGE OF A, B $ C BATTE R ES, '2. THE MERCURY SWTCHES 52 AND 54 (NORMALLY CLOSED) SHOULD. FULLY OPEN BEFORE. SWTCHES S AND 53 (NORMALLY OPEN)CLOSE. 3. THE ELECTROMAGNET WLL FOLLOW DAL PULSES; DO NOT TRY TO READJUST. T FGURE. AMPERTE 26C2 (BOTTOM VEW) \ OF SOCK.ET 7 TELECART CONTROL Cl RCUT ~, r, ELECTRO MAGNET......J SEE NOTE3 ===~= +~ ~ : Ro.;.A~ R W R. ljl ~ '<:i ct ~ Ul C)... BK BKX VlJ6./ L j ::.l. Q UPPER HOUSNG CON. RE L,AY SEE A2,~3 Fl~URE: R L B BK)( C 2( = c... LCON_COLLECTO~ YELl ow l _ ' RED (,..,A GREEN r BLACK SECTON 58469MS G Al,r,~.:;.;;,. V FGURE 6,, r\.. 7 l )s : '..l4.,/. / B J COi N COLLECTOR MODFED FOR USE WTH TELE.CART 2Y. A.J 3 R V ' V lo L / CAUTON: SEE NOTE C V Page 6 TC Library

7 SECTON 58469MS 3. 4 The Telecart Control Circuit shown in Figure 7 prevents fraudulent or accidental return of coins which, without this circuit, will occur either when the cart is tilted or when the plug is removed from the jack before the coins are collected. Circuit requirements are shown in Table 2. TABLE 2 CRCUT REQUREMENTS APPARATUS DRECT CURRENT FLOW REQ i CKT i TEST TEST TEST DESG CODE. FG! WDG FOR AFTER SOAK MA MA READJ MA A Ul245 2 p s B! Yl5 2 p. ' l! i i H R l! l The circuit consists mainly of two relays and two pairs of mercury switches which control the operation of the telecart under various conditions. Condition A Normal Operation (Receiver offhook and coin deposited.) (See Figure 6 and Figure 7). Battery A operates relay (A) through the bottom contacts 2 & 3 of relay (B), mercury switches S2 and S4 and the coin relay contact. The operation of relay (A) connects the coin relay winding to line through top contacts 3 & 4 of relay (A). The coin collector operates normally from this point. Condition B 2. Relay {A) releases when coin contact opens through return or collection of coins. Plug Removed from Jack before Coin is Collected l. Relay (A) releases when lead G is opened. 2. Relay (B) operates, energized by A battery. Operation of relay (B) re moves the coin relay winding from the line and connects it through the Ampe rite Timer to A, B & C batteries in series, thus collecting coins. 3. Amperite Timer operates after /2 second, releasing the coin relay, which in Page 7 TC Library

8 SECTON 58469MS Condition C turn releases relay (B). Cart Tilted to Cause Premature Release of Coins The circuit operates normally with mercury switches S2 and S4 closed and S and S3 open. Tilting the cart in one direction causes switch S2 to open and switch Sl to close; tilting in the other direction causes switch S4 to open and switch S3 to close.. Cart tilted before coin is deposited. open, gong transmitter cannot transmit "coin release" signal. 2. Cart tilted after coin is deposited. With coin relay operated, tilting cart causes relay (A) to release, relay (B) to operate, and coins to be collected as in B and B2 above. The slow release of relay (B) through operation of the Amperite Timer ensures collection of the coins even though the cart is levelled quickly. When coin is deposited, relay (B) operates, causing the coin to be collected as in B2 above. With the line Page 8 8 Pages TC Library