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Re: apple monitor iie (a2m6017) help.

touchstone wrote:

Hi,

I recently acquired an Apple Monitor //e (a2m6017 - platinum a2m2010)
that has an odd video problem.

The video output drops out once in a while.  When i first started
using it the RCA socket was extremely
loose and the problem was more prevelent and required a jiggle on the
cable to get it going again.
No problem, just replace the jack, which i did.  Now it only does it
once i a while, every 20 - 30 minutes or
so.  So, I'm thinking of digging a little deeper.  From what i can
tell there is a disk capacitor attached between the
shield wire, the shield of the jack and the center conductor of the
cable and a green resistor from the center
conductor of the cable to the center pin on the jack.  This is all
covered in a blob of hot glue,  so it needs more
disection.

I also am using a diffferent cable, and the connection at the //e's
end is OK.

A couple of questions though.  Is the green resistor a resistor or an
RF choke, does anyone have a schematic
of this monitor, and third, can anyone else think of anything I'm
missing?


The good news is that it doesn't matter.  ;-)

You can safely bypass (remove) those components and just connect the
center conductor directly to wherever the video goes.  It doesn't sound
like the capacitor is a coupling capacitor, and the series resistor/
inductor likely isn't doing anything useful.

Of course, you can also clean off the hot glue and re-solder all the
joints, since it sounds like one in the signal path is imperfect.

As an afterthought, you might also check out the metal part of the
connector that makes contact with the center pin of the plug.  Some
plugs have larger center pins than others, and they can "spring" the
center connector so that it makes loose contact with a smaller pin.

-michael

AppleCrate II: An Apple II "blade server"!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."