GAI-Tronics 12552-001 User Manual

Pub. 42003-122A

GAI-TRONICS® CORPORATION

A HUBBELL COMPANY

Rotar y Switch Harness Assembly

Replacement Kit

MODEL 61504-053

Confidentiality Notice

This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information which is confidential and proprietary to GAI-Tronics. GAI­Tronics retains all intellectual property and other rights in or to the information contained herein, and such
information may only be used in connection with the operation of your GAI-Tronics product or system.
This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any third party.

General Information

The Model 61504-053 Rotary Switch Harness Assembly Replacement Kit is intended for use on the
Model 478-002 Centra-Page II/Electro-Sound II (CPII/ESII) Desktop Subset.

Installation

Removing the Old Harness Assembly

1. Locate the party-line selector switch on the front panel of the subset. Use flat blade screwdriver to

pop out the cap in the center of the knob.

2. Using long-nosed pliers or a wrench, loosen, but do not remove, the hex nut inside the party-line

selector knob.

3. Remove the party-line selector knob.

4. Use the long-nose pliers or a wrench to remove and discard the collar nut securing the party-line

selector switch to the front panel.

5. Remove and save the four screws securing the housing to the bottom panel.

6. Hinge the housing forward to access the interior of the telephone. Locate the post header on the

printed circuit board marked
header.

J3, PARTY LINE SELECT. Disengage the connector from this post

7. Pull the party-line selector switch through the rear of the front panel, and discard the old harness

assembly.

8. Remove and discard the two-party line label.

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Pub. 42003-122A

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ODEL 61504-053 ROTARY SWITCH HARNESS REPLACEMENT KIT Page: 2 of 2

Installing the New Harness Assembly

NOTE: Steps 1–3 may not be required depending on when the unit was manufactured.

1. Drill a 0.140-inch (3.56 mm) hole in the front panel as shown in Figure 1.

Figure 1. Front Panel Modifications

2. Cut the threaded studs as shown in Figure 1.

3. Attach the two-party line label on the exterior of the front panel as shown in Figure 1.

4. Install the switch using the supplied hardware to the front panel as shown in Figure 2. The

anti-rotation device MUST go into the 0.140-inch (3.56 mm) drilled hole.

5. Reconnect the connector to the post header marked

J3, PARTY LINE SELECT.

6. Place the party-line selector knob over the top of the switch assembly.

7. Use a pair of pliers to tighten the hex nut, and to secure the party-line selector knob.

8. Snap the cap into the party-line selector knob.

9. Close the subset using the four screws from Step 5 in the previous section.

Figure2. Switch Assembly

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