Film-Tech Forum ARCHIVE: Strong AP-5 problem

This is topic Strong AP-5 problem in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Alan Gilbertson (Member # 242) on 08-26-2006, 03:29 PM:

I have a Strong AP platter. It is a 5 deck system and the bottom half will not rewind, but it will payout. This is happening with the 3 decks running off of the same variac. Any clues? Thanks

Posted by Gordon McLeod (Member # 33) on 08-27-2006, 01:09 PM:

probably the micro switch on the takeup roller that does the programing for payout/takeup

Posted by Steve Guttag (Member # 268) on 08-27-2006, 06:06 PM:

I don't have a schematic in front of me but if memory serves...there is a resistor right after the variac to determine the take up speed. In non-ap platters there is a resistor in each motor. The resistor forces the shuttle/elevator/yo-yo lower so that the payout platter has extra speed available to catch up.

I would check the schematic of the AP platter, locate the resistor for the bottom decks and check the connections there.

Posted by Gordon McLeod (Member # 33) on 08-27-2006, 09:52 PM:

That resistor is usually mounted to the plate on the top of the post

Posted by Monte L Fullmer (Member # 2797) on 08-28-2006, 03:40 AM:

This kinda answers my question that I was having on the Alpha platters then - why the A-3 units have a three pin plug to the motor whereas the AP-3 has only the two pin plug - since the A3 has those 2ohm 25w resistors within the motor frame working with the mode switch on the front doing the "A/B" switching between diode and resistor....is this right on this assumption then?

-Monte

Posted by Steve Guttag (Member # 268) on 08-28-2006, 06:13 AM:

Ayup.

Posted by Alan Gilbertson (Member # 242) on 08-28-2006, 02:18 PM:

Thanks to all for the help. The problem did happen to be one of the resistors in the top of the platter column. One of the wires had come loose.