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  Dead Munich Board ???!!!
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   Author  Topic: Dead Munich Board ???!!!  (Read 809 times)
Blitzkrieg-Burritomeister
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Re:Dead Munich Board ???!!!
« on: January 29, 2009, 04:43PM »
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Here's the latest news and its a happy one!
I just put everything back together (except for the very outer plate) 
and decided to power it up simply because I had measured what I 
thought was a good voltage at the internals... the power LED lit up! 
I haven't put the modules in, this has literally only just happened, I 
will update you again soon.

Alex"
The more brittle cable was the narrower, power cable (from the 
transformer to the power PCB).

Anyway, I just plugged in the MM VI modules, and it worked!  I'm off 
to complete the transaction so that you get paid ASAP.

Alex"

  Phew!!! Dodged a bullet on that one! Thank Mike for the moral support and you guys who where rooting for us.

  JG 


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Blitzkrieg-Burritomeister
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Re:Dead Munich Board ???!!!
« Reply #1 on: January 29, 2009, 04:09PM »
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Here is an addition from the buyer, Alex who is trying to do some troubleshooting.

"I've opened it up further, attached is a picture showing the insides.

The power cable from the transformer/switch assembly to the circuit 
board shown in the top left is soldered on, and sound.

The backplane/board PCB cable was firmly connected when I opened it 
up.  As you can see in the picture there's even a pair of blue wires 
that are holding it in place so that it can't work its way free.

The most interesting thing was the power connector springs that 
transfer power between the power supply PCB and the backplane: I 
measured 5.7V there, and while I don't know what voltage is supposed 
to be there, 5.7 is very likely correct.  Could you ask on the 
bulletin board to see if anyone knows if this is correct?

Alex "

  Is his question.

  JG




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Blitzkrieg-Burritomeister
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Re:Dead Munich Board ???!!!
« Reply #2 on: January 29, 2009, 03:35PM »
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Quote from: Mike Watters on January 29, 2009, 02:48AM   

Johnny there is just a chance that the ribbon cable connecting the drawer to the PCB has become detached. Exactly that happened to me with a Munich board a few years ago. The board was dead on arrival (not sure about the indicator light though) because the ribbon cable had shaken loose. To check that the person just needs to undo the screws holding the drawer in place and take a look behind.

Thanks Mike

    That jogged my memory about a prior ribbon problem I had with it years ago.
  As a matter of fact the symptoms were exactly the same those years ago I
had it fixed. I had somehow figured out it was the cable. Maybe I saw the
break, I can''t remember.

  It was a German fellow who fixed it and he didn't want to do because he
didn't understand what he was doing because he was not familiar with the
electronics. I remember getting a little short with him and asked him to
just do it, which he did.

  I wonder if the ribbon part is an off the shelf item.? Or should I have it soldered again. The ribbon is brittle.

  JG

  JG
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Re:Dead Munich Board ???!!!
« Reply #3 on: January 29, 2009, 02:48AM »
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Johnny there is just a chance that the ribbon cable connecting the drawer to the PCB has become detached. Exactly that happened to me with a Munich board a few years ago. The board was dead on arrival (not sure about the indicator light though) because the ribbon cable had shaken loose. To check that the person just needs to undo the screws holding the drawer in place and take a look behind.
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Blitzkrieg-Burritomeister
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Dead Munich Board ???!!!
« Reply #4 on: January 28, 2009, 11:28PM »
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Hi Guys 

    I'm a little bit somber tonight. I found a nice buyer for my Munich board but when he got it today he could not get it to get power (power up). Green indicator lamp did not light and no response at all after preparing and inserting MM IV modules and matching 9v power adapter. He reinserted several modules and tested in his exclusive board and that works fine but not in the Munich board.

  It is one of those early boards whose distributor told me it could not take 16/32 mods (no 'S' on logo) probably 1985. I had been working for me for a couple week prior and just prior to shipping (2 days shipping) CA to IL.

    Do we have any hope?! He's taking it to a local electronics repair tomorrow but I'm not sure.

  Any suggestions I can relay to him before he returns it DOA.

  JG                 
« Last Edit: January 28, 2009, 11:29PM by johnnygar » Report to moderator Logged
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