eib(md) 01·~ eid ringer - bell system...
TRANSCRIPT
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EIB(MD) 01·~
EID RINGER
54-TYPE CONTROl_ UI'-/IT (LOCeHE NEAR MONITOR STATION)
760A LOUDSPEAKER
WITH 69A BRACI<ET
INDOOR REMOTE STATIONS
?EO A LOUDS~'Et1KER
1. GENERAL
CO AND INTERPHONE LiNt:S
1.01 This section is reissued to:
• Include schematic diagrams of control unit formerly found in Section 512-515-400.
• Include information on 54B control unit and ElD ringer.
• Show that the 54A control unit and ElB ringer are rated MD.
Since this reissue covers a general rev1s10n, arrows ordinarily used to indicate changes have been omitted.
CENTRAL OFFICE LINE
rNTERPHOr~E LINE ONLY
(a) Planning
MONITOR STATION
KS-16846,LI l.OUDSPEAKER
OUTDOOR REMOTE LOUDSPEAKER
(1) When planning the 2A farm interphone installation, consider the following:
• Avoid placing apparatus with plastic covers or parts in locations where the ambient temperature may exceed 140 degrees F.
• Any combination up to a total of six loudspeakers may be used, provided, no more than three are outdoor speakers
")A:n·-i·c2._n Teiephone c.;_:·;d Tdegrapb Printed in U.S.A.
the out door
0 telephone set 2~Jine
up and signaling and sufficient mounting cord conductors rnay be used with the farm lnterphonc system.
• Loudspeakers at all stations (except outdoor type) should be located as near the associated telephone set as practicable for customer to obtain maximum benefit from telephone usage as well as loudspeakers.
• 759-type loudspeakers should be located so that volume control is readily accessable.
• Control unit should be located near monitor station for ease of wiring.
• Control unit should be located within 6 feet (length of power cord) of a nov, 60Hz ac power receptacle which is not under control of a switch.
• The monitor station is the major location in the system and should be located in an area usually occupied during the time of day that the customer has the greatest need for the monitor feature.
ft . . A 0
The of monitm· station lacks secrecy. If any stat-ion is up and handset button is not operated, it is possible to listen to activities in the monitor station area. This condition has advantages and disadvantages which should be explained to the customer. A cutoff key may be necessary.
• The KS-16846, List 1 loudspeaker (outdoor type) effectively covers an area that extends 60 degrees on each side of the center line of the speaker and so should be oriented toward the area where coverage is desired.
~Outdoor loudspeakers commonly are ~ placed in areas where exposure to light·
Use cords, station nt-side
poncnts of the in.tcreonnect coin-
from_ the weatheL _For con1JJ01l
to weather, use exterior vvn'lng shnilar to drop wire. On longer runs of wiring, the loop resistance must be considered. Table A shows the maximum length of various wires used to interconnect stations of the system. These distances plus the central office loop must not exceed the working limits of the central office.
TABlE A
SEPARATIONS Of STATIONS
MAXIMUM LENGTH TYPE CONDUCTOR !N FEU*
Drop Wire 6,000 Multiple Drop Wire 4,000 B Rural Wire 16,000 D Station Wire 19,000 Inside Wire Cable 5,000 109 Line Wire 16,000
* This length plus central office loop must not exceed working lim.its of central office.
(b)
@ Use eare in unpacking .~v'H"m components to prevent dmnage to plastic covers and controls.
(c) Installing
(1) 54-type Control Units
® Loosen two captive screws and rernove cover. Remove P-15E917 plastic caps from cable entrance openings of cover.
• Mount in upright position (as marked on chassis) to a flat surface. Avoid locations which may be snb.iect to dust, temperature or humidity extremes, or abuse.
ticms, iTse SCXCV,f
a11 terminations,
i/dal'ce ruJ> trol unii'"
e Replace cover) then close off unused portion of cable entrance openings by breaking plastic caps on indented marks with long-nose pliers and snapping into position.
• Plug power cord into suitable ac receptacle.
(2) 759B Loudspeaker
e Loosen two captive screws and remove cover.
• Mount vertically or horizontally with volume control oriented as to be readily accessible. Install as near as practicable to associated telephone set.
• Can be secured by four screws through base. Base is also drilled to permit mounting on a 63A bracket or to a standard electrical outlet box by using- a 146B adapter.
., Make connections as shcn,vn in appropriate connections and maintenance sec~
tion. Cord and cable entrance is through holes provided in base or knockouts at end of base.
• The 12-terminal connecting block serves as a bridg-ing- point between control unit, loudspeaker, and telephone set. Use screw-type terminals for all ten11inations.
• Replace cover.
(3) 760A Loudspeaker
• Either place on flat surface such as table, shelf, or counter top or install on wall using 139A bracket.
• To use 69A bracket, secure bracket to wall, insert loudspeaker cord through
vided,
c.o:;;rr.eetlo:ns to sarn.c block as the associated teit·-
phone set cord. If is a wail-type cord inside set.
KS-16846, List 1 Loudspeaker
• Install by securing swivel base to flat surface with suitable fasteners or by removing- circular base of swivel mounting and attaching speaker to 1/2-inch pipe.
• Orient horn to area where coverage is required.
• Make connections to suitable connecting block in weatherproof housing.
Review station protection procedures. Use station protectors on all circuits ex· posed to lightning.
(5) ElB (MD) or ElD Ringer
• Install at monitor station only.
*' Ren1ove housing and securE; base to flat surface '.vith suitable fasteners. Four gron11Y1eted 1nounting holes are provided in the base. Orient volume control slide to provide ready access to user.
e Make connecticns as shown in Fig. 2 or appropriate telephone set connection and maintenance section. Replace cover.
• As connected, ring-er provides ringing at monitor station and tone ringing sig-nal at all other loudspeaker stations throug-h relay in control unit. If tone ringing- is desired at monitor station, strap terminal Jl to terminal J2 at control unit terminal board.
• The volume control of the ElB (MD) or ElD ringer controls both ring-er and tone ringing- to remote stations. When placed in the hig-h volume position, the tone ringing feature is disabled and only
lVote: When is eo:nneeted 1
used in the ;nto'>''h'"'" be disconnected. JYionitor station ringer should present the only ringing bridge to the central office line. Ring signal to other stations will be provided by tone ringing relay in control unit.
(6) Service Options
Auxiliary monitor station
• If an auxiliary monitor station is desired it can be wired in parallel to the main monitor station and bridged at the control unit or the 759A loudspeaker.
• The SA lead of the control unit can be extended to one monitor location only. This lead is used to shunt the volume control of the monitor loudspeaker and permits any remote station to transmit using their handset and be received at full volume at the shunted loudspeaker.
Cutoff key
• If privacy is desired at monitor station install a cutoff key (6017-type key or equivalent) near the monitor station telephone set. Wire the key between terminal 7 of the 759A loudspeaker and terminal C of the control unit.
• When the cutoff key is opened, remote stations can not go off-hook and listen to sounds or activities in the area of the monitor station.
Transmitter amplifier
• In long loop conditions which require amplification of the G-type handset transmitter, two amplifiers (276A and 277 A) are available for installation in the handset.
"'i11· j j'l.(•
;;, ;gA is used cnn c:nts of the is the sarrw 'lS a '2/Tfiis,_ ,,z,::erJt a
is included to nrnt,•d ""'"n<e11ine reversal.
'I'he arnplifier is installed inside the G!SKH handset transn:litter cavity with the handset cord transmitter leads con-· nected to terminals L and V so that the V terminal is positive with respect to L. The transmitter unit is then installed and the cap replaced.
~ !malate the handset cord stay band ~ with electrician's tape to prevent pos
sible shorting of amplifier components.
• See Section 501-226-100 for complete descriptive information and schematic.s of transmitter amplifiers.
Auxiliary DC voltage
• -35 volts de voltage is available at the control unit terminal marked DC for uses external to the control unit.
• Connections to this terminal should be made by leads external to the system wiring and the following caution strictly followed.
CAUTION: Wherever possible, leads con, nected to the IJC terminal should m;t be exposed. however, are exposed~ the control unit must be protected fmm lightning or power surges applied to the connecting cables. A KS-19150L1 (72-ohm, 1/2 watt) resistor, in addition to normal protection, must be connected between the protector blocks and the IJC terminal.
• There are normally no requirements for power from the DC terminal within the 2A farm interphone system.
3. MAINTENANCE
ft Remove power from 54-type control unit before attempting any maintenance of interplwne components.
* Do not use cc''"''ino' DOwdel''S or c.leansers on colored apparatus,
Do not al.low excess water to enter grills of loudspeaker mtits.
• If cleaning does not produce the desired effect, replace the component.
(b) Inspecting
• Housings or covers should not be warped or discolored.
• Turnbuttons and volume controls should work freely without binding or sticking.
@ Wiring and mounting cords should be checked for damage to the insulating covering and should not be placed to present a hazard to cnstomer or equipment.
• Screen behind louvers of control unit cover should be intact and free of obstructions.
(c) Troubleshooting
• Table B provides a list of the more common troubles encountered with 2A farm interphone and their probable causes with recommended corrective action.
(d) Connection Index
Fig. 2- Line and Ringer Connections
Fig. 3- 54A (MD) Control Unit, Schematic Showing Modification Using D-180117 Kit of Parts
Fig. 4- 54B Control Unit, Schematic
(e) Replaceable Apparatus
(1) 54-Type Control Unit
• KS-16935, List 11 Cord (power)
• P-15E918 Cover Assembly
• RM-784064 Fuse (3/4-amp.)
nance 1s any cornpo·-test ec:tch station in for
proper operation of central office line pkktJp and hold as well as the interphone features.
fit ~ E A D
lY!ake rw adinsiFnents on. the "'k·ClJrpe con@ trol unit.
(2) Test monitor station output with one or more remote stations being received at
full volume. Using volume control, lower the output of the monitor loudspeaker. If factory furnished volume control (100 ohm potentiometer) does not lower audio output sufficiently, a 1000-ohm P-25E020 potentiom· eter may be substituted. Assure tbat volume cannot be cut off completely.
Note: Customer should be forewarned that hands-free operation at the monitor station will be affected by the increase in volume control resistance and that it will be necessary to increase volume when transmitting for satisfactory results.
(3) In cases of :radio frequency interference, proceed as foliows:
a. If a series one amplifier is used (marked P-12E487 SER 1 or P-20F193
SER 1), place a KS-13814, List 1 capacitor (0.05 f"f) between terminals 3 and 4 of the 2563C transformer in the control unit.
b. If interference is still encountered, proceed as follows:
• If interference is heard in the handset when it is used for monitoring, with neither push-to-talk bar depressed nor the quieting relay actuated, connect an additional KS-13814, List 1 (0.05 f"f) capacitor between terminals C and Sl of the control unit terminal strip.
l'<~ge 6
;,rul"lc heard on ti1c set \Vhen the handset is off h.ook a:nd
""" vu tors in. series rnay )yc; usecL
paeitor between terminals 2R an_d 2T of the control. unit terminal
'* Hefer to sections in the Divi-
0 If radio frequency interference is heard on the handset after the quieting relay has been actuated, connect a KS-13814, List 4 or 542L (0.1 JLf) capacitor be-
sion 502 for nudntenance of the various telephone sets associated with the :fa:r:m interphone syst0m.
• Replace G5KR handset if push-to-talk switch does not function properly.
2A FARM INTERPHONE COMMON TROUBLES AND PROBABLE CAUSE
TROUBlE PROBABLE CAUSE CORRIECT!ON
Incorrect or defective Rearrange, repair, o:r Individual speaker not wiring replace wiring
operating properly .
Defective speaker Replace speaker
Incorrect or defective wiring to Rearrange, repair or Weak or noisy output one or 1nore speaker locations replace wiring
on all speakers Defective control unit Replace control unit
Crosstalk between Split cable pairs Rearrange wiring CO line and
. .. """~-"·-
Output of control unit Replace control unit intercom line too high
I AC power supply off or Check AC nower or
1-- plug pulled out place plug back in outlet System completely ~·~"
dead Blown. fuse Replace fuse (3/4 amp) ~-----·- -------- - ·-
Defective control nnit Replace control unit
.... ....... 1':18 (MD) oe EIO :<INGER
p 8 ;
9 l STRAP
5 I ( l'lOTE I)
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RINGER CONNECTIONS
E!B (MOl OR 6878 EID RINGER SUB SET
(NOTE 2) p
a I 0--9 Ll
6 i 2
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TIP
RING c.o. LINE {TABLE C)
i-- ---- _!!_R~
54-TYPE CONTROL UNIT
RG
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;:: IR
GO J c.o. LINE (TABLE C)
CONNECTIONS FOR POLARIZED RINGING USING 6878 SUBSCRIBER SET
TABLE C C 0 LINE CONNECTIONS
CLASS OF SERVICE RING
INDIVIDUAL; BRIDGED IR
RING PARTY IR
TIP PARTY IT
ALL POS AND NEG RING PARTIES IR
ALL POS ANO NEG TIP PARTIES IT
* NOT REQUIRED, SEE NOTE I
TIP GRD
IT * IT GO
IR GO
IT GD
IR GO
NOTES:
FOR INDIVIDUAL OR BRIDGED SERVICE PLACE STRAP AS SHOWN. DO NOT CONNECT PROTECTOR GROUND AT CONTROL UNIT.
2. MODIFY 6878 SUBSCRIBER SET AS FOLLOWS:
FOR All POSITIVE PARTIES MOVE (BR-BL} LEAD
FROM TERMINAL I TO TERMINAL L2.
FOR ALL NEGATIVE PARTIES MOVE {BR~BL) LEAD FROM TERMINAL I TO TERMINAL G.
3. CONNECTIONS SHOWN FOR NEGATIVE PARTIES. FOR POSITIVE PARTIES CONNECT IR TO G AND GO TO L2.
8 INDICATES CONNECTION FOR NEGATIVE PARTIES.
(±) INDICATES CONNECTION FOR POSITIVE PARTIES.
fig. 2- line and Ringer Connections
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NOTES:
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2. COMPONENTS AND LEADS DRAWN WITH HEAVY LINES INDICATE MODIFICATION USING D-160117 KIT OF PARTS
3. REMOVED WHEN MODIF:JED AND CONNECTED THROUGH Rl
Fig. 3-54.1!. (MDJ Control Unit, Schematic Showing Modificalion Using !l-180Jl7 Kit ol Paris IShee! 2 of 21
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fig. 4- 54!1 Control Unll, Schematic (Sheel 1 of 2)
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L_il TERMINAL BOARD ASSEMBLY
fig. 4- 5411 Control Unil, Schematic (Sheel 2 ol 21
!1 ll Pages