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Western Electric 302 and 5302 Telephone – Circuit and Dial Schematics

Started by unbeldi, June 16, 2016, 10:45:17 AM

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Western Electric 302 (1937–1954) and 5302 (1955–1965) telephone:

The circuit is drawn in the on-hook condition, i.e. when the handset is in the cradle.

The designations in the images of the dials (5H/5J, 6A/6D) correspond to the designations for the switches in the drawing. The switching arrangement of all dials compatible with the 302 telephone is shown to the right. The left-most contact pair (Y-BK) is the pulsing switch, with the elongated spring being the active one. On the No. 6 dial however, it is the Y contact that is moving.

The induction coil is shown in the last image.  It bears the screw connection terminals L1, L2, Y, C, GN, and R.

The 302-type telephone may have been equipped with either a two-conductor line cord with red and green conductors, or a three-conductor cord, which has an extra yellow conductor. The yellow lead was for installation with divided ringing systems, in which the yellow wire was a ground connection, and served as the return path to the central office for the power ringing signal, which was applied to either the ring or the tip lead. This permitted selective ringing of two stations on one telephone line — a party line.

The telephone with the two-conductor cord was coded 302-A (manual), -B, -C, or -D (dial) while the three-conductor version were the 302-E (manual), -F, -G, or -H (dial).  A typical two-conductor cord was the D2D-9, and a typical three-conductor cord was D3AL-9, both brown cotton-cloth covered tinsel conductor cords.

The dial versions could be equipped with three different dials:
302B and 302F:  5HA dial (black numbers only)
302C and 302G:  5HB dial (red numbers and black letters)
302D and 302H:  5HE dial (party line dial with WRJM letters)

Type 5302
The 5302 telephones were produced from 1955 to ca. 1965 in the work shops; therefore, they are really remanufactured 302 sets that reused the bases and often the handsets of older 302s, but added a new housing. The circuit is identical to the 302, but the dials were remarked from a 5H to 5M, or from a 6A to a 6H, because of the different number plate, that were black and only had white dots in the center of the finger holes of the finger wheel.

Automatic Electric dial
Sometimes a 302 may be found with an Automatic Electric dial, having an equivalent contact arrangement. These were made by AECo for compatibility with Western Electric dials for the independent market where AECo dials were often preferred over WECo dials.  Such a dial is shown in the last image.  It is an AE Type 24 dial, with the compatible AK-29 contact spring assembly and the WECo-corresponding terminal designations, as found in this topic.

Switch schematic of 302 dials.

Nick in Manitou