Zenith Remote Control
3 Attachment(s)
I have a '64 Zenith console, "The Chancellor" with a 25LC20QS chassis. I have the correct space command 400 remote for this set however this remote was bought separately. I am trying to find out how to get the remote to function with this set. I am enclosing a picture of what I think is the remote section on the back of the tv. What is the manual/automatic switch at the top? I couldn't find anything in the sams about this. A picture of the remote is in the nearby vertical centering thread. Any help appreciated. Also an unrelated issue, I can't seem to fine tune the picture. Regardless of which way I turn the tuning knob, it seems to have no effect.
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Manual disables the remote, Automatic enables the remote. It is a fail safe insace a relay sticks, and it also allows power savings on vacations, etc.
It was not uncommon for Zenith to shuffle the remote rods arround or use different ones on different years/models. Do any of the remote buttons activate any relays on the set? I generally troubleshoot remotes by plugging in the set's mike to a scope to confirm the mike works. Then I try to follow that signal through the remote chassis with the scope. I often use an audio generator that can go up to 20-30KHz to replace the mike while signal tracing....You can also dial the signal gen around to see if the relays work, but happen to be tuned to different freqs. If it works on different freqs you can compare them to the ones in the hand unit and see which functions on the set best match the rods and tune those functions to those rods (and later reshuffle the rods the buttons operate so that the labels match). The fine tuning mech in your tuner may need work. |
Channel lower button works. Volume/on-off button does not work. Sound (mute) button works. Channel higher button does not work.
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When one or two functions on ultrasonics fail, it is usually the remote - the rods corrode, the mounts deteriorate, or the striker has deformed. Got another remote to try? If not, take a close look at the rods and mounts in your remote. Post pix if you can - I've seen just a speck of encrusted dirt kill a function on the clicker remotes.
3/4ths of your remote receiver are known good if you have any functions working. |
5 Attachment(s)
Took remote apart to inspect and clean. Pictures are before I used contact cleaner to carefully clean any gunk out. Inside looked surprisingly clean. After cleaning it still does the same thing. I noticed inside the remote section there looks to be a possible sensitivity adjustment? Have noticed when I hit the channel higher button, I hear nothing in the remote section as I do with all of the other buttons. Volume/on-off button makes a sound in the remote section like the rest of the good buttons but does nothing.
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Agree on the cleanliness - spotless! Be careful with any adjustments - I'd follow the alignment procedure for the remote chassis - do you have a Zenith manual for the remote chassis? Sams is awful with their alignment procedures for remote chassis (at least for RCA and Magnavox...).
If that is indeed a sensitivity control - be careful - too sensitive and some features will quit working, as the gain is increased to the point of saturating the amp, and causing the control pulses to widen. Also, too much sensitivity can cause it to respond to other sounds - keys jingling on a key chain, the phone, etc. Cheers, |
Don't have the zenith manual for the remote chassis. You would think that if it was a sensitivity issue that none of the buttons would work or all would work.
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If you lose your Zenith tuning fork remote...
and want to see if the remote is working, get out your key chain and shake vigorously in front of the set. If the tuner or any control moves, you can bet the rest of the functions work. At least that was the way it was in the 60's when we serviced the things. Great way to change the channels at home if the remote isn't handy.
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Tried the key jiggling method. Nothing.
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I tried to use the remote about an hour ago and nothing. No buttons worked. Tried it again a few minutes ago and the same buttons that worked before worked again. Why would it stop working all of a sudden and then start working again? Sams wants an additional $22 for the remote chassis photofact, 705-4A.
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In my SC500 table model set, one dead electrolytic in the remote chassis killed all the remote functions. I don't know how it is on those, but you may consider checking the caps.
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If the remote chassis uses tubes, they could be pretty weak by now. Remember that they would have stayed on 24/7.
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Bryan, His remote is mechanical, uses 4 ultrasonic chimes. Range seems to be 36-42 Khz.
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