RK05 stuff (was RE: cctalk Digest, Vol 10, Issue 74)

From: John Lawson <jpl15_at_panix.com>
Date: Sat Jul 17 23:41:45 2004

On Sun, 18 Jul 2004, Ashley Carder wrote:

> Yep, the belts are intact and if I remove the bottom cover, I can
> turn the motor and spindle easily.
>
> Nope, nothing's clicking.
>
> Other ideas?

  Observation first: You said both drives have the same symptom? Herein
might be a Clew.

   Ideas:

   Obtain (download, etc) the Engineering Prints on your drives, if you
don't have them already. Find the section showing the various motor
circuits. Locate any fuses, relay contacts, switches, etc, on the print
and physically on the drive. It's a pretty simple mechanism, as these
things go... of course I am rather presumptively assuming you can read a
bit of Schematic, no?

  Obtain a simple method of reading continuity, resistance, and voltage,(AC
and DC) - most el-cheapo DVMs fit this spec nicely. Use it to determine
the static and dynamic state(s) of the motor supply and control circuits.
Is there AC voltage available to the motor circuits? IS there any voltage
on the motor connections themselves, when the drive is set up so that you
would expect it to spin the pack? With the drive de-energized, is there
continuity across any switches or relay contacts in the motor circuit?
etc. etc...
   The motor relay 'not clicking' is a good place to start... the motor
and blower circuits are simple and a bit of Holmesian electro-sleuthing
ought to reveal the problem in short order.

   The usual cautions about working on energized electro-mechanical devices
apply: professionals, closed course, don't try this At Home,
yada/yada/yada...


   And it is possible that Professor Duell will grace you with his spot-on
information anent this problem, tho it is bedtime in Merry Old just now.


   Cheers

John


PS: I don't have the RK05 prints anymore, drat! Just RL02 Stuff.
Received on Sat Jul 17 2004 - 23:41:45 BST