GAI-Tronics 12521-003 Microphone Assembly Replacement Kit for 297 & 298 Series Phones - Manual (Page 2)

Pub. 42003-227A
M ODEL 12521-003 M ICROPHONE A SSEMBLY R EPLACEMENT K IT Page: 2 of 2
f:\standard ioms - current release\42003 kit manuals\42003-227a.doc
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4. Remove the 2 KEPS nuts from the microphone assembly and lift old microphone off the front panel.
Carefully remove old microphone grille. See Figure 1.
Figure 1. Microphone Assembly
Installing the New Microphone Assembly
Refer to Figure 1.
1. Place new microphone grille (1) onto the two mounting studs on the front panel.
2. Place new microphone mounting block (2) onto the two mounting studs over the top of the grille from
step 1.
3. Thread microphone assembly (3) wire leads through the microphone gasket (4) and through the
microphone mounting bracket (5).
4. Position the microphone assembly (3) into the microphone mounting block (2) and then place
microphone mounting bracket (5) over the assembly and onto the studs on the front panel. Place
KEPS nuts onto studs and tighten.
5. Plug the microphone wire leads into J4 on the PCBA.
6. Secure the speaker, hookswitch, and microphone wires together with supplied tie wrap.
7. Reconnect all field wiring as noted in step 1 of the “Removing the Old Microphone Assembly”
section.
8. Place the front panel onto back box, tighten the tamper-resistant screws, and make a test call from the
unit.
N OTE : 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.