The Workbench

Re: Repair on a Master Control Panel 5500....?

Medogsfat — Wed, 06 Oct 2010 11:57:42 GMT

You have a PM Michael.

Chris.

Re: Repair on a Master Control Panel 5500....?

Bentleyman — Sun, 03 Oct 2010 09:34:51 GMT

Medogsfat:

I can change the switch no problem Michael.

I'm in Leeds.

Chris.

Oh cheers Chris,

Could you give me an estimation of your charge & send me your postal address please. I'll get it off to you shortly by recorded or special delivery

Many thanks,

Michael

Re: Repair on a Master Control Panel 5500....?

Medogsfat — Sun, 03 Oct 2010 07:50:17 GMT

I can change the switch no problem Michael.

I'm in Leeds.

Chris.

Re: Repair on a Master Control Panel 5500....?

Bentleyman — Sun, 03 Oct 2010 07:25:22 GMT

lausvi:

I got an almost free MCP5500 (aluminium with ugly spots of some kind of glue and broken hinges but otherwise great condition) some weeks ago, with original box.

I have opened it and tried to clean (first with contact cleaner, later with fine sand-paper) the microswitch but it's still working randomly. Sometimes it works flawlessly and sometimes it doesn't work at all (I have to rotate the dial up and down until it starts working).

The switch has a socketed cable so if you can get a replacement, it's very easy to replace. Here is a close-up of the mechanism:

Oh thanks for that Sir,

So its just a simple 'plug-out the old' and 'plug in the new' type situation?

well, if it's really as easy as that perhaps even I could do it , so Chris or anyone else who may have a spare switch please could you leave details for me.

Many thanks for all the advice

Michael

Re: Repair on a Master Control Panel 5500....?

lausvi — Sun, 03 Oct 2010 07:16:32 GMT

I got an almost free MCP5500 (aluminium with ugly spots of some kind of glue and broken hinges but otherwise great condition) some weeks ago, with original box.

I have opened it and tried to clean (first with contact cleaner, later with fine sand-paper) the microswitch but it's still working randomly. Sometimes it works flawlessly and sometimes it doesn't work at all (I have to rotate the dial up and down until it starts working).

The switch has a socketed cable so if you can get a replacement, it's very easy to replace. Here is a close-up of the mechanism:

Re: Repair on a Master Control Panel 5500....?

Bentleyman — Sun, 03 Oct 2010 06:41:54 GMT

Dillen:

Are the other functions of the MCP working ?

Martin

Hi Martin,

Yes, all other functions seem to be working just fine.

Michael

Re: Repair on a Master Control Panel 5500....?

Dillen — Sun, 03 Oct 2010 06:39:10 GMT

Are the other functions of the MCP working ?

Martin

Re: Repair on a Master Control Panel 5500....?

Bentleyman — Sun, 03 Oct 2010 06:11:53 GMT

Medogsfat:

I have a replacement microswitch. It may just need the contacts cleaning though if this is the fault.

Chris.

Hello Chris,

Many thanks for your help. According to advice given on this thread, it sounds like the microswitch is what I need (or maybe just cleaning as you say) as the MCP doesnt light up on moving the dial.

Is the microswitch an easy job for someone with no technical ability at all, like me..? Would I need to get hold of the service manual, or perform any soldering to replace this switch?

And if you have a microswitch or sale, please let me have the details.

If you do these types of repairs yourself (i remember talking to you about re-covering Penta frets i think!) please let me know if I could send the MCP up to you for attention.

Many thanks for your help.

Michael

Re: Repair on a Master Control Panel 5500....?

Bentleyman — Sun, 03 Oct 2010 06:04:11 GMT

Dillen:

If the MCP does NOT light up when the wheel is rotated, the microswitch is bad.
If the MCP lights up when you rotate the wheel but the volume does not change, the microswitch is OK
and the optical reader is bad (I have a few NOS optos).

Martin

Oh thank you very much, the MCP does NOT light up when the wheel is rotated. Therefore I guess I'm needing the new microswitch then.

When coming to do that replacement, do I need to refer to the service manual I wonder? Or maybe you guys could talk me through what I need to do..

...if this job needs soldering or the use of any technical equipment I'm not able to do that & would be looking to send it off to someone in that case.

Thanks for your helpful assistance.

Re: Repair on a Master Control Panel 5500....?

Medogsfat — Sun, 03 Oct 2010 05:34:43 GMT

I have a replacement microswitch. It may just need the contacts cleaning though if this is the fault.

Chris.

Re: Repair on a Master Control Panel 5500....?

Dillen — Sun, 03 Oct 2010 05:15:48 GMT

If the MCP does NOT light up when the wheel is rotated, the microswitch is bad.
If the MCP lights up when you rotate the wheel but the volume does not change, the microswitch is OK
and the optical reader is bad (I have a few NOS optos).

Martin

Re: Repair on a Master Control Panel 5500....?

Craig — Sat, 02 Oct 2010 15:58:23 GMT

Sounds like the microswitch has gone. Seen a few posts about this over the years. Not a hard job to replace it yourself from what I understand.

Craig

Repair on a Master Control Panel 5500....?

Bentleyman — Sat, 02 Oct 2010 14:58:05 GMT

Could anyone point me in the right direction, toward someone with technical ability who could possibly have a go at repairing the rotary volume control dial on a MCP5500.

The unit itself is in pretty good shape, and every other function seems to work fine.

Shame then that the rotary dial (which is not split or broken like many) is simply not raising/lowering the volume as it should.

If there is anyone (preferably in the UK) that has the knowledge to repair this, please let me know. If necessary, I will consider sending it overseas if no-one in the UK is recommended.

Many thanks all.

Michael