This Instruction describes the Telephone No. 711 and outlines its application and installation. For use on Automatic Systems the Telephone No. 711 is superseded by the
Telephone No 741. (See TI C3 B1025.)DESCRIPTION
The Telephone No. 711... is a wall telephone incorporating the 700 type telephone circuit. It is supplied without a cord or a block terminal and cable connections to it are made via a hole in the telephone base. A Handset No. 3 is used and this rests across the top of the instrument to operate the two gravity- switch plungers. The two tines of the cradle provide 'off hook' positions. The picture shows a GEC produced Telephone No. 711.
FACILITIES
The Telephone No. 711 is the wall equivalent of both the Telephone No. 706 and the Telephone No. 710 . It provides for all the facilities offered by the two instruments. As supplied the telephone is suitable for exclusive service on DEL and PBX extensions where press-buttons are not required. All other facilities are provided by the addition of various add-on units. The Telephone No. 711 may also be used on Local Battery Systems.
ADD-ON UNITS
Single Press-Button (as for Telephone No. 706)
When only a single change-over contact is required fit Switch No 5A-3 and Part 1/DBR/381.
Full circuit details and fitting instructions for these parts are given in Dgm N 811.
One-to-Four Press Buttons (as for Telephone No. 710)
Where more than a single change-over contact is required fit a Frame and Latching Unit, Part 1/DFR/107. This unit carries a latch plate similar to that used in the Telephone No. 710 and enables the standard Telephone No. 710 push-button spring-sets to be fitted and the same inter-locking facilities to be provided. Fitting instructions, latching arrangements and circuit details of the press-button spring-sets are given in Dgm N
848 (see picture to the right).Auxiliary Gravity-Switch Contacts
These are provided by fitting auxiliary spring-sets, Part 1/DSP/1501 or 1/DSP/1269. An auxiliary spring-set combined with an inductor (Adapter, Local-battery, No 7) is used in local battery exchange areas. The full range of add-on spring-sets is shown in Dgm N 848. The spring-set brackets are provided with a slotted fixing hole to facilitate the correct positioning of the contacts.
Additional 2 PF Capacitor
A Capacitor, No. 7712-2 and a Clip No. 90 are fitted.
Additional terminals
Fit one or two Parts 2/DST/836 or a Strip, Connection, No. 155A.
Buzzer No 32C
When the telephone is used as the extension of a Plan 105 or, 107 fit a Buzzer No. 32C-2. To facilitate the fitting of the buzzer first remove the regulator. The buzzer 32C ... supersedes the 32A...
Lamps
One or two Lamp-fittings No 17A can be fitted. The small fixing screw must be fitted in the appropriate screw thread depending on whether it is for left or right hand fixing. A cover Part 4/DCO/659, with two opals, must be requisitioned separately. The Lamp-fitting No 17A uses Lamps No 41...
PRESS-BUTTONS
When press-buttons are required the long dummy must first be removed from the telephone case. The long hole in the case must always be completely filled with either buttons or a button and dummies depending on whether a Part 1/DFR/107 or Switch No 5A-3 is fitted. The press-buttons are shown in Dgm N 849.
With Switch No. 5A-3
Fit press-button Part ... /DBU/266 or ... /DBU/267 as required. The two screws on the Switch No 5A-3 are loosened and the press-button is placed in the slot between the switch and its bracket. The screws are then tightened. The two spring clips, which hold the long dummy in the case, are used to retain two small dummies (Part 1/DBU/270) one at either end of the slot in the case.
With Part 1/DFR/107 the slot must always be completely filled with press buttons. Part 1/DBU/378 (colour) or 1/DBU/379 (colour). These are 2 piece buttons, a coloured inner (ivory or grey) and a transparent cover. A self adhesive label A 6644 bearing the required legend is fitted between the 2 pieces. The label should be requisitioned separately from the local stationary supply point (Stationary Vocab Sect M492-10 item 01-3759). When fitting black telephones, grey buttons should be used.
Part 1/DBU/379 is twice the width of Part 1/DBU/378 and by a suitable selection of these 2 buttons a balanced layout can be obtained. A single locking button which operates independently of the latch mechanism can be obtained by using a Part 5/DPL/382 and a Button 1/DBU/378 bearing the legend `ON-OFF'. To fit Part 5/DPL/382 the appropriate plunger restoring spring is loosened, the plunger is removed and replaced by Part 5/DPL/382.
HANDSETS
A Handset No's 4, 5, 6, 7 or 14A may be used with the Telephone No. 711...
ADDITIONAL WATCH RECEIVER
A Receiver, Watch, No 8T may be used by fitting a Hook, Receiver, AH using the same screw which is used to fix the telephone to its T fixing bracket.
LAMP SIGNALLING UNITS No's 1 & 2
When fitting these, the connection strip bracket on the Lamp Signalling Unit should be shifted to the top edge of the unit.
INSTALLATION
Each wall telephone is supplied with a special `T' bracket and screw. Fix the bracket to the wall using at least two of the four holes provided. Only two rubber feet are fitted in the telephone base and after the cover has been removed hang the upper two feet holes over the two hooks of the bracket. Slide the handset cord grommet to one side and with the screw supplied, fix the telephone to the bottom of the bracket through the hole in the cord grommet bracket. The cord grommet must be centralised before replacing the cover.
When the telephone is being installed in a confined space, e.g. a lift, it may not be possible to use the Cover Retaining Screw 1/DSC/176. Where this is the case, a Hexagon Headed Screw 1/DSC/531 which can be tightened with a spanner should be used.
REPLACEMENT PARTS
Part To be requisitioned as:-
