GAI-Tronics 12521-001 User Manual

Pub. 42003-055B

GAI-TRONICS® CORPORATION

A HUBBELL COMPANY

Microphone Assembly Repla cement Kit

Model 12521-001

Confidentiality Notice

This manua l is provide d sole ly as an operatio nal, installation, and ma inte nance guide and conta ins
sensitive business and t e chnical informatio n tha t is confidentia l and pr opri et ary to GAI- Tronics.
GAI-Tronics 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 manu al may not be dis clos e d in any form, in whole or in pa rt, direct ly or i ndir ectly, to a ny
third pa r ty.

General Information

The Model 12521-001 Microphone Assembly Replacement Kit is used for the following models:
Model 280, 280AL, 281, 281AL, 281KS, 281ALKS, 283, 283AD, 283AL, 283AL-AD, 284AL, 284AL­AD, 287RP, 287RP-AD, and 296. This kit includes the following components:

Qty Description Item Number

1 Gasket Assembly 1
1 Microphone with Leads 2
1 Microphone Gasket 3
1 Microphone/Gasket Bracket 4
1 Microphone Mounting Bracket 5
2 Screw 6
1 Tie Wrap 7

Installation

Removing the Old Microphone Assembly

1. Use a Model 233 Tamper-Resistant Screwdriver to loosen the 4 front panel tamper-resistant screws.

Open the front panel of the telephone by swinging the panel to the left. Remove the front panel.

2. Cut the tie wrap that secures the speaker, hookswitch, and microphone wires together.

3. Unplug all connections from the printed circuit board.

4. Remove the 2 screws from the microphone assembly.

5. Remove the wire harness with the microphone bracket.

GAI-Tronics Corporation P.O. Box 1060, Readi ng, PA 19607-1060 USA

610-777-1374  800-492-1212  Fax: [phone]

ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS

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Pub. 42003-055B

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ODEL 12521-001 MICROPHONE ASSEMBLY REPLACEMENT KIT Page: 2 of 2

Figure 1. Microphone Assembly

Installing the New Microphone Assembly

Refer to Figure 1.

1. Remove the backing from the gasket assembly (Item 1), and attach it to the front of the microphone

(Item 2).

2. Lay the gasket/microphone assembly in place on the rear of the front panel.

3. Feed the microphone leads through the microphone gasket (Item 3), microphone/gasket bracket

(Item 4), and microphone mounting bracket (Item 5).

4. Insert and tighten the 2 new screws (Item 6).

5. Replace the door by aligning the interior hinge plugs with the rear enclosure and pushing firmly

straight back.

6. Reattach the microphone assembly connector to the PCBA at J5.

7. Reattach the speaker assembly connector to the PCBA at J6.

8. Reattach the push-button connector to the PCBA at J4.

9. Use the new tie wrap to tie the wires together. Make sure the push-button wire is positioned between

the speaker and microphone wires; this will eliminate feedback between the speaker and microphone
wires.

10. Swing the front panel closed, tighten the tamper-resistant screws, and make a test call from the unit.

Note

: Installation of a new microphone may require the volume level to be readjusted. In this case, see

the unit’s original installation manual for adjustment instructions.

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