GAI-Tronics 12504-010 User Manual

Pub. 42003-218B

GAI-TRONICS® CORPORATION

A HUBBELL COMPANY

Keypad Replacement Kit for

Model 491-204 Mine Dial Page Telephone

Model 12504-010

Confidentiality Notice

This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary 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 manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.

General Information

The Model 12504-010 Keypad Replacement Kit for the Model 491-204 Mine Dial Page Telephone
includes the following components:

Qty Description

1 Keypad assembly
1 Keypad seal
1 Resistor, 100-ohm, 3-watt, WW or MF
3 Cable tie-wrap

Installation

Tools Required

• 5/16-inch nut driver

• 1/4-inch nut driver

• Phillips screwdriver

• Wire cutter

CAUTION

technician or by a GAI-Tronics authorized service center. Installation by any other service center
or personnel will void MSHA approval.

WARNING

This upgrade replacement kit may only be installed by a GAI-Tronics

Substitution of components may impair intrinsic safety.

R104 located on 69491-002 PCBA must
approval. See Figures 1, 2, 3 and 4 to give a visual aid to identify and determine if the PCB assemblies
were modified.

GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA

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

V

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

be a 3-watt wire wound or metal film resistor to maintain MSHA

Pub. 42003-218B

Model 12504-010 Keypad Replacement Kit for Model 491-204 Mine Dial Page Phone Page:

2 of 5

Figure 1. Keypad Assembly 69615

BEFORE Modifications

Figure 2. Keypad Assembly 69615

AFTER Modifications

Figure 3. Amplifier PCB Assembly 69491-002

BEFORE R104 Modification

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Figure 4. Amplifier PCB Assembly 69491-002

AFTER R104 Modification