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Troubleshooting Guide

MCP35A Troubleshooting Procedure

If a problem exists on the MCP35A, certain steps should be taken to find the problem. This test relates to the

Program Amplifier (All-Call or Emergency). The first indication of a problem will appear on the three level indicators

at the front of the unit. They are green, yellow, and red.

If there is no problem, the green, yellow and/or the red LED should flicker whenever audio is present, depending

on the signal strength. A problem is indicated when the red LED does not flicker no matter what level the program

control is set to.

To find the problem, follow this simple procedure:

1. Disconnect the switchbank(s), SBA225, from the MCP35A and depress the emergency button. While

speaking into the built-in microphone, adjust the Program Level Control and check the level indicators as

described above. If all three indicators can be made to light depending on the output level control setting,

then the MCP35A is okay.

2. Connect only the first switchbank (if more than one is being used). With the speaker load still connected,

check the level indicators again.

3. If the MCP35A LEDʼs still indicate a problem when connected to the switchbank, each speaker location on

that switchbank being tested should be removed one at a time, until the level indicators show a normal

output. The speaker and cable associated with that location should then be checked.

4. Follow the same procedure, connecting each successive switchbank until the troublesome SBA225 panel

or speaker load is found.

5. If the MCP35A is tested without the switchbank, and the three LEDʼs do not ʻlightʼ indicating full output,

then the 35-watt program amplifier of the MCP35A may be defective. Contact the Bogen Applications

Engineering Department for assistance.

If it appears that there is no intercom communication between the unit and a speaker station, the 20-watt intercom

amplifier inside the MCP35A may be defective. Contact the Bogen Applications Engineering Department for assistance.

Caution: Do not attempt to connect a 25V speaker directly to the MCP35A using GND as one of the connecting

points. This could seriously damage the MCP35A because the unit uses a balanced output when connected to the

speaker lines.

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Bogen PI35A Especificaciones Pagina 20