It may be just a question of cleaning/lubricating moving parts. As I
understand it, the tone arm applies a bit of pressure to a curved arm that
hits a pin on a toothed gear. Once the arm reaches the end of the recorded
portion of the Columbia record it no longer moves inward. The pin and gear
moves and engages another gear which picks up power from the motor to move
the brake to the off position. The curved arm has to be free enough to
move and not stall as the arm moves. I think it is a friction fit around
the base of the arm. I'd look there first and then see if the gear with
the pin is free to move.
Ron L
-Original Message-
From: phono-l-boun...@oldcrank.org [mailto:phono-l-boun...@oldcrank.org] On
Behalf Of Arvin Casas
Sent: Friday, March 22, 2013 10:47 PM
To: 'Antique Phonograph List'
Subject: [Phono-L] Older Grafonola Auto Stop
Phono List Friends,
A newbie question / request. I was wondering if anyone out there is
familiar enough with the older Columbia Grafonolas to help me with my 75's
auto stop?
My 75, when the switch is engaged below the platter, stops arbitrarily
during play. I've no idea if this is par for this older system or if there
is anything I can do to tweak and set the brake properly.
I've read and have followed what little documentation exists, and it is
still unclear to me how to get this to work, at least in the way I interpret
it should. I recognize the mechanism was later improved (e.g., the
Viva-Tonal auto stop), but I don't know how well (or poorly) I can expect
this ancestor to function.
Please feel free to contact me / consult off list as I'm not sure this would
be of great interest to the majority of the Phono Listers.
Thanks!
Arvin
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