[Pindsen]

Hi,
Working on a BM1400 Type 2659 I have that almost all buttons are stuck – they do not move. I am trying to push and pull while using contact cleaner but it do not make a change – what do I do?

/Pindsen

[Mark-sf]

You will need to open the top and remove the front panel as if I remember the switch assemblies are board mounted. Once you have access, you can see what is hanging up the interlock mechanism.

[Dillen]

The buttons are stuck in dry lubricants.
Pull the knobs off, clean both sides of the metal blade for each knob and the respective
mating slot in the knobs plastic backside.
Contact cleaner can often help dissolve and shift the dried stuff.
Sometimes IPA is better. Try and see.
Pipe cleaners are good for cleaning both parts as they can be shaped to suit and will fit nicely in the slot.
When clean add a little silicone grease (of the non-hardening type) to the slot in the
plastic backsides and push back the knobs.

All this can be done from the front.
If a knob is really stubborn, you can lever it off careful using a flat-bladed screwdriver
from below into the knobs recess and against the front frame with pieces of thin cardboard between to avoid scratching.

Martin

• This reply was modified 11 months, 2 weeks ago by Dillen.

[Pindsen]

Hi,
Thank you for the description, I had not noticed the ability to pull the knobs off like you mention. Then I might have another issue, and that is that the buttons do not thay IN when being pressed. There was a small blade spring that has become loose, it was attached to the P2 button on the side but despite trying mounting it differently I cannot make it work – I assume it have something to do with the plastic thing moving underneath the buttons?
Can you help with that also?

/Pindsen

[chartz]

Good luck and remember, we love pictures here.

[Pindsen]

Hi,
I can very well end this thread by saying that I figured out how it worked. So the spring-back effect was controlled by the bronze metal spring attached on the P2 button but due to metal fatigue it had no effect anymore so I had to create a new spring effect. It is impressive these small detailed engineering techniques B&O has created over years.

[Author]

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