My doors open about halfway and then they need an assist the rest of the way. prety sure thats kind of how it was when it was new, most likely the grease down in the hinge mechanism is still ok. One thing that happen on the tape side is the lid alignment goes away in part because of the back  spreing pushing against it for twenty  + years. Also the roll hinge pins At the back of the lid become out of kilter - again from the backspring pressure. The screws just mount into the plastic frame and break free allowing the pins to move.

No unsoldering needed in removing the tape mechanism. Really not that tough a job. The hardest part is cleaning up all the old belt goop.

Is there anything to unplug when you put the 7700 into service position?  looks like 2 screws then it lifts up on one side?.   So the whole cassette mechanism removes to put belts on then? and what do you use to clean the belt residue rubbing alcohol? or something better?

Yes you will have to unplug two dins that feed the line signal from the unit to the power amp board  after you unplug the the two speaker like dines the upper half will lift up so you can set the service stand.

for cleaning the belt goop lube oil 3 in 1 will work or you can use some gasoline. ISP in this case isnt very effective.

Login to view image

Login to view image

Login to view image

Thanks for the nice pictures looks like just thye old standard din plug just like the back of the unit this should help alot then take some screws out then the whole cassette come out? 

I will be selling a MCP 7700 on eBay shortly,  I'll put a link on here if you guys are interested.

Andy T.

Bought mine off Burantek (Jeff) Andy. But Someone else here could use them.

The Two din plugs will need to be disconnected in order to open up the unit for servicing.  A closer look at the pictures will show a couple of wire harnesses feeding the cassette player. Its' PCB is located underneath the turntable as is the radio tuner section.

Hi all,

Nothing to do with the present case by maybe someone can help me:

-------------------------------------------------------------------------------------------

I have some trouble with a Beocenter 7700 too.

I can only switch it on/off with the help of the power cable.

The display shows “0” and “P” and additionally some recorder leds on.

It is impossible to control other functions, all the keys doesn’t react.

It looks that the Beocenter boot and then freeze on the mentioned display activities.

Normally it is possible to test the microprocessor with “Stand-By” + “Record” ,  the result should be “0” and “P” for an intact microprocessor. I cannot start the test because the keys don’t react but the display shows actually these both characters (sign that the microprocessor is OK?).

I founded somebody which had exactly the same problem in the Net, but till now I didn’t get any answer.

Any idea where I can look at? Is it possible to reset the microprocessor?

Should I try to disconnect the recorder because of the lighting record leds (removing connection cable internally)?

--------------------------------------------------------------------------------

Any Help would be appreciated

Best regards

JJ

Eugene wrote:

Bought mine off Burantek (Jeff) Andy. But Someone else here could use them.

Ok Eugene, but

so here is the beginning of my restoration.

Keep us posted Eugene, I just missed out on 2 fifferent 7700 on the bay, to expencive but still looking