gec.gif (1164 bytes)GEC 1000 TYPE
CIRCUIT DIAGRAMS


Here are three diagrams - you have to make up your mind which is the correct one for your telephone.  Under each diagram are instructions on how to wire the telephone up for the UK Plug and Socket system.  The telephone in the upper diagram can be identified by only having 7 terminals in the main block, whilst the lower diagram has two sets of terminal blocks of which the left hand block is labelled "A Terminals".

Diagram KS10888C

Diagram KS10888C

Using a standard BT line cord connect:-

  1. White of line cord to terminal 5.

  2. Red of line cord to terminal 1.

  3. Green of line cord - spare - insulate.

  4. Disconnect orange wire on 2uf capacitor (insulate with tape).

  5. Blue of line cord to the connector on the end of the black wire shown leading from the capacitor or directly connect to the black wire on the capacitor..

  6. If a 3.3k ohm resistor is fitted, then remove green wire from terminal 5 and terminate on terminal 2.

  7. Install 3.3k ohm resistor between terminals 2 & 5.

  8. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 4 & 6.  Click here for more information.

 


Diagram KS 13066
Single terminal block

Diagram KS13066

Using a standard BT line cord connect:-

  1. White of line cord to terminal 5.

  2. Red of line cord to terminal 1.

  3. Green of line cord - spare - insulate.

  4. Disconnect orange wire on 2uf capacitor (insulate with tape).

  5. Blue of line cord to the connector on the end of the black wire shown leading from the capacitor or connect directly to the capacitor terminal.

  6. If a 3.3k ohm resistor is fitted, then remove green wire from terminal 5 and terminate on terminal 2.

  7. Install 3.3k ohm resistor between terminals 2 & 5.

  8. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 4 & 6.  Click here for more information.


Diagram KS 13027
Twin terminal blocks

Click here for the TEL17T/ATS Diagram

This telephone has two block terminals and the left hand block in named "A Terminals".

Diagram KS13027

The diagram above is for joining two telephone together

Warning - in the instructions below, the wiring is connected on the A1 to A7 terminal block and also the 1 to 7 terminal block.  The A terminal block is on the left looking from the back of the phone.

Using a standard BT line cord connect:-

  1. Connect a 3.3k resistor to terminals A6 and A7.

  2. Connect White of line cord to terminal A6.

  3. Remove strap between terminals 4 & 7.

  4. Connect Red of line cord to terminal 7.

  5. Ensure that terminals A2 and A3 are strapped together.

  6. Connect Blue of line cord to terminal A2.

  7. Connect Green of line cord to terminal 6.

  8. Fit a Rectifier element across the receiver on terminals 1 & 3.  Click here for more information.

  9. Test phone and if transmission is bad / noisy / crackly then short out the transmitter on terminals 2 and 5.  If the noise goes then the transmitter will need replacing.

The picture below shows a phone converted to the above instructions.  Note the red and green line cord wires are on the right hand block.

   

 
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Last revised: February 28, 2015

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