Zenith 12S568

4/3/2009 7:06:48 AMjoeinri

Hi all,
I have Zenith 12S568 shutterdial that I've just finished a re-cap/resistor/wiring on. The set is playing BUT....have a broken dial cord. In trying to repair...I've run into a snag. I can't get a full swing of the dial from 550KHZ to 1500. Gets about 1/2 way and hits the "stop". Originally, with the tuning plates fully meshed, the dial pointer was at about 1100KHZ...after I pulled a drive gear away from another ..I was able to set the pointer to 500KHZ, fully meshed...but will only go as high as about 7-800KHZ before it will hit the stop.

Any ideas out there??
Puzzled in Rhode Island,
Joe

4/3/2009 2:46:01 PMEdd

Somehow I’m wondering how you were “stringing” that thing up, and if the dial cord was in any way affixed to the mechanism with a tie down ?,or you just arranged as a continuous loop.

Seems like that unit is using a dial BELT, and continuously rotates with no stopping of the belt until it slips as the mechanism hits its limit of travel at each mechanical tuning end.

Some people use “O “ rings 1/8 in width by a proper slightly stretched circumference.

OR, dial belt materiel is offered as a continuous length, that then can be cut to proper length and butt joined with alpha cyanoacrylic. . .. . .AKA. . .SOOOOOOPER GLEW.

OR you can obtain and use an intact belt IF you are willing to do a semi tear- down of the mechanism in order to install it.

73's de Edd

ZENITH SHUTTER DIAL :