Anyone familiar with servos, solenoids and relays in color tuners

[Electronic M]

Originally Posted by etype2

Hmmmm ... I can see the photos on my iPad. Here is a link to where all the photos are posted. Scroll down to 1958. Bear with my musings.

http://www.visions4.net/journal/vintage-rca-color-tv/

Can you see this link okay?

The problem I had seeing the pics turned out to be on my end....Firefox crashed not long after I posted that comment and is displaying those pictures fine now.

I'd assume that chain drive is for the channel selector, and meets up with the gear train in the other picture. Could you post a picture of where the other end of the chain goes to? If I understand Adam's comments correctly there are at least two electronically actuated elements that must function for the tuner etc to move: the motor shaft which extends to mesh with a gear train + spins, and a solenoid with a gear on the end which extends to mesh some gears to connect the motor gear train with the tuner chain system.

The motor spins some of the gears right? If so look at the nearest gear it spins to the chain drive mech....If one of the solenoid gears should be linking the two but is not, and does not move with the correct button pressed try manually moving the solenoid (with the motor off) if it is sticky lubricate it and work it by hand a bit, if it moves freely look for drive voltage on it when the button is pressed. If it has drive voltage see if it is open, if it lacks drive voltage look at the control circuits.

I've never seen a mech quite like that before...Quite an interesting way to do things.