[GreenKeys] Searching for Answers.

[Steve Garrison]

OK, put on your thinking caps!

 

Nick, N0NCQ, and I are working on a M15 that will soon find it's way to a
new home in FL with one of our younger members.

 

And we have run into issues.  Some of which we seem to have resolved, but at
the moment one that stumps us!

 

Here is the scenario (once some of the multiple issues were resolved):

1.	Typing unit and keyboard removed from base.
2.	M15 plugged in to AC outlet.
3.	Power switch turned to on position.
4.	Motor does not start.
5.	Remove motor from base.
6.	Measure voltage at motor contacts 13 & 16 on the base and find line
voltage of 125V AC (13 & 16 per the schematic we are using).
7.	Using a cheater cord, apply 125V AC to motor contacts corresponding
to 13 &16 (the outer two of the four on the motor unit), motor runs fine.
8.	With motor back in place on the base, measuring across 13 & 16 from
under the keyboard shows a very low voltage.
9.	With power cord removed from wall outlet and using the cheater cord
on the back side of 13 & 16 the motor runs!
10.	Again using the cheater cord, but now placing the leads on the AC
power block at terminals 21 & 23 (with normal power cord unplugged) the
motor again does not run!

 

Something in the base seems do be the culprit, but there isn't much else on
the base.  Under the base is a mess of laced wiring going I don't know
where.  There is a terminal block in the back left of the base that has
nothing connected to the terminals on the top screws of the block.  Guess
that was originally where line relay and motor control circuitry was
located.

 

This machine seems to have some shade tree mechanic work done on it over the
decades a we have uncovered and worked around a couple of wiring issues that
were done maybe for stop gap measures.  One was wiring the machine in the
always on condition as the power switch seemed rather flaky.  This was
resolved by just a thorough clean of oil and grease that had accumulated in
the switch itself.

 

Any and all suggestions accepted!

 

 

Steve G./N4TTY

Nick/N0NCQ

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