GAI-Tronics 491-204 Manuale - Pagina 5

Sfoglia online o scarica il pdf Manuale per Telefono GAI-Tronics 491-204. GAI-Tronics 491-204 11. Mine dial/page telephone

Pub. 42004-195E

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Model 491-204 Mine Dial/Page Telephone

Page:

Most of the electronic circuitry is located on a single plug-in PCBA, GAI-Tronics Model 69491-401,

inside the Model 491-204 Station. The circuitry associated with keypad and sidetone adjustment is

located on a small PCBA behind the keypad (Model 69491-002). All these circuits operate from a single

12 V NEDA 926 lantern battery also contained within the station. These internal components are shown

in Figure 3.

Figure 3. Internal Components

For each Mine Dial/Page Telephone station, a GAI-Tronics Model 69001-001 Interface PCBA must be

used. This assembly is a plug-in printed circuit board measuring approximately 7.5 × 4.5 inches (190.5 ×

114 mm) and must be mounted in a non-hazardous area within a Model 495-001 Mine Dial/Page

Telephone Interface Cabinet.

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