TELEPHONE No. 711


General Information on 700 Type Telephones

How to wire your Telephone No. 711 to make it work on Plug and Socket

General fault finding on your phone

Click here for Additional Buttons N849 - Web users - CD users

Click here for the Auxiliary Switches N848 - Web users - CD users

Circuit diagram N811

Click here for the circuit diagram - Web users - CD users

See also the GEC TEL/2W

Prototype pictures


TELECOMMUNICATIONS INSTRUCTION
C MARKETING INSTALLATION
3 Internal
Bl004
Issue 3, Nov 1977

TELEPHONE No. 711
Description and Installation

INTRODUCTION
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  For use on Automatic Systems the Telephone No. 711 is superseded by the Telephone No 741.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 for the handset to hang on.  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 pictures above).

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 (see picture below).

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 (the bracket is shown on one of the pictures above).

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 (located close to the handset cord entry point).  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:-

Description   Vocabulary name
Cover (without opals)Part 3/DCO/659, colour
Special 6BA screw (to fix cover to base)Part 1/DSC/176
Long dummyPart 1/DBU/271
Spring clips (for dummy buttons)Part 1/DSP/510
Standard plungerPart 3/DPL/382
Springs (for use with Frame & Latching Unit)Part 2/DSP/1507
RegulatorRegulator No. 1A
T shaped wall bracketBracket, Telephone, No. 6


The telephone No. 711 is superseded by Telephone No. 741

Transparent cased Unusual red model
 
Later version with clear dial fingerplate  

 

Rear view of a 700 type telephone showing wall fitting bracket



The bracket locates in the top two feet holes and is fixed to the bottom of the base
by a screw just above the handset cord


Additional information

ModelMarkBlackGreyIvoryRedIntroducedRemarks
Tele 711Mk 1yyyy  
Tele 711CBMk 1yyyy4/61 
Tele 711DMk 1yyy 7/82Fitted with high impedance bell
Tele 711FMk 1yyy 6/69 
 Mk 1yyy 6/69Refurbished
Tele 711LMk 1yyy 4/61 

Cases
Original Telephone 711 cases were Perspex (Polymethylmethacrylate, code 12 in the moulding somewhere) but later they were ABS (Code 17 ISTR).

The Telephone 741 case was the almost the same as the 711, except that the 741 version had a rebate about 1.5mm deep and the same wide on the inside edge.   This was all round the face of the body that contacted the chassis.  It allowed for the up-turned edge of the metal chassis (originally designed for the 746) to be snugly accommodated.

A 741 case will fit a 711.  The other way round it depends on which variant of the base is being used.  The metal base became rare as it rattled on the Bracket, Telephone,  No. 16.  The plastic bases were proprietary and different moulders had subtly different designs.

Paul Ebling
 

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: August 24, 2013

FM