Master Control Panel (MCP) 5500 Micro Switch

[Greg Steinlicht]

Proud owner of a Beomaster 5500 system. Everything appears to be working well except the Master Control Panelvolume wheel and radio station Up and Down buttons not functioning.

When wheel is turned, nothing lights up on display. When radio buttons pressed, no stations are presented.

Based on research, my understanding is that I need a Micro Switch to fix the wheel.

DOES ANYONE KNOW WHERE I CAN FIND ONE OF THESE?

I looked online but have found nothing. For the radio buttons, it appears I may need to clean the contacts.

Any support that can be provided is greatly appreciated !

• This topic was modified 2 days, 2 hours ago by Greg Steinlicht.

[Guy]

Hi Greg and welcome to Beoworld!

You could first try cleaning the contacts of the existing microswitch – carefully with contact cleaner. I would think that a replacement switch can only be removed from another MCP5500.

You could try shorting the contacts of the microswitch while turning the wheel, just to prove that this is the problem.  (If the opto-coupler had failed then the system would light up but no changes would be registered)

I hope this helps – it’s a very long time since I worked on an MCP5500!

Location: Warwickshire, UK

My B&O Icons:

[Greg Steinlicht]

Guy, thanks for your response. I have already cleaned the microswitch, with contact cleaner, but it did not have any effect.

When you say “shorten the contacts”, does this mean squeeze in the contacts inward while turning the wheel or something else?

[Greg Steinlicht]

I tested the micro switch with a DMM. When the wheel is turned and the metal bar in the middle makes contact with either side contact, there is continuity.  So at least that part of the switch appears to function.

• This reply was modified 56 minutes ago by Greg Steinlicht.

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