GAI-Tronics 12520-011 and 12520-012 Piezo Switch Assembly Replacement Kit for 300 Series Telephones - Manual (Page 3)

Pub. 42003-239B
M ODELS 12520-011 AND 12520-012 P IEZO S WITCH A SSEMBLY R EPLACEMENT K IT Page 3 of 3
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Model 396, 397 and 398 Series Telephones
Removing the Old Piezo Switch Assembly
1. Use a Model 233-001 Security Screwdriver to remove the six front panel screws. Save the screws for
re-assembly.
2. Lift the front panel assembly away from the back box approximately 6 to 8 inches.
3. Unplug the telephone line cord from the modular block in the back box, and disconnect the strobe
wires, if applicable.
4. Remove the front panel assembly, and place it face down on a flat surface.
5. Use the wire cutters to snip the tie wrap that is securing the push-button assembly cables to the other
wires.
6. Unplug the piezo switch assembly cable from the PCBA. Be sure to note the location of the
connection for re-assembly.
10. Using the 1-1/4 inch box wrench, loosen the hex nut. See Figure 1.
11. Remove and discard the hex nut and piezo switch assembly. Remove any residual gasket material
from the front cover.
Installing the New Piezo Switch Assembly
1. Slide the O-ring over the piezo switch threads to the undercut location.
2. From the front side of the panel, push the new push-button assembly through the hole. See Figure 1.
3. Plug the piezo switch assembly cable into the PCBA at the proper location.
4. Use the enclosed tie wrap to secure the piezo switch assembly cable to the other wires.
5. Plug the telephone line cord into the modular block in the back box, and reconnect the strobe wires,
if applicable.
6. Align the front cover with the rear enclosure, and use the Model 233-001 Security Screwdriver to
secure six front panel screws (previously saved).