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Fitting 706 / 746 / Trim

Fitting RotaTone to a GPO 706 / 746 / 8746 – And TrimPhone 722

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Here is how a converted GPO 706 / 746 / 8746 should be wired before RotaTone is fitted.

A standard converted GPO 706 / 746 / 8746.GPO 706 / 746 / 8746 Wiring Diagram - Converted Only - No RotaTone

Note A – Rectifier no. 205 – should already be fitted, email us if you require one.
Note B – 3.3k resistor – should be fitted (if required), if not there will be a strap/link. A 3.3kΩ REN should be fitted if your telephone has 2 x 500Ω bell coils. If there are 2 x 2000Ω bell coils, only a strap/link is required.

A GPO 706 / 746 / 8746 fitted with RotaTone and Polarity Guard
Note: If you have terminal 19A and/or 19B – The RotaTone red wire can be terminated there and no link wire on the underside of the board is required.GPO 706 / 746 / 8746 Wiring Diagram Showing RotaTone Fitted including Polarity Guard

fThe 706 RotaTone fitting is the same as the (8)746 for all components, except the link wire. Then there are 2 options depending whether or not a circuit board is present on your 706.

746 / 8746 Link wire placement * Not required if you have terminal 19A and/or 19B *.RotaTone Module Link Wire Soldered on GPO 746 8746

GPO 706 Link wire placement – Circuit board model.RotaTone Link Wire Slodered on GPO 706 Circuit Board

706 Link wire placement – No circuit board model – 2 images – Both taken before RotaTone is fitted.

Attach one end here …RotaTone Link Wire Soldered on GPO 706 with No Circuit Board

… then attach the other end here.

RotaTone Link Wire on GPO 706 with No Circuit Board 2

A converted GPO 746 / 8746 – Top View of Circuit Board – note Handset cable
removed for picture.RotaTone Module and Components Fitted on GPO 746 8746 Top View

A converted GPO 746 / 8746 – Right-hand View of Circuit Board – note Handset cable removed for picture.RotaTone Module and Components Fitted on GPO 746 8746 Right Hand View

A converted GPO 746 / 8746 – Left-hand View of Circuit Board – note Handset cable removed for picture.RotaTone Module and Components Fitted on GPO 746 8746 Left Hand View

RotaTone location – 706 – ‘No circuit board’ model.

RotaTone Unit Fitted in GPO 706

RotaTone location – 706 – ‘Circuit board’ model.

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RotaTone location – (8)746

RotaTone Unit Fitted in GPO 746

Solder a small solder eyelet to each of the Orange, White and Brown leads of the RotaTone. Note: Ensure the white wire, that connects to the D4 terminal on the dial is not touching any other terminal.

* On some of the newer dials, the 5 terminal are laid out in reverse order. When disconnecting the original dial loom, note how the orange, pink and brown cables are connected. The orange, white and brown of the RotaTone connect to the same terminals (pink=white).

RotaTone Modue Dial Wiring on GPO 706 746 8746

RotaTone Modue Dial Wiring on GPO 706 746 8746 Close Up

Clean dial contacts to ensure RotaTone works exactly as it should.

The 3 points to clean are shown below. As you can see, one of the sets is in a closed position already so can be cleaned by running the cleaning strip between them a few times. The other 2 sets can be closed by turning the dial, then cleaned.
dial_cleaning_points

White dial wire, D4 solder lug adjustment.

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