CED VideoDisc and Player Discussion

[Beetlescott]

I have my wonderful tank player the SGT250 and have always preferred it over the SJT400, However, i am becoming adjusted to the "Page" feature, and the auto load isn't bad either:). I am testing some of my discs out, I have dupes of some and I am trying to find which of my discs playe the best.Anyway, for no special reason, I played The first movie in my SJT400, and it sounded great! After it played, I put the second movie in my SGT250, and it seemed to be much more quiet! The SGT250 Stereo light wasn't on! I tried 2 more stereo movies, and none of them played in Stereo. I know that the stylus that begin with 149 are momo stylus thaht will play in the mono or stereo players of the "G: series. I checked my stylus out and it is 154100. Can someone shed some light on this?
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1000 titles
SGT-250
SJT-400
Montgomery Ward
SGT-100

[deantjeep]

Scott, I sent you this info in an email, but will post it here, should someone else have a similar problem.

First check to see if the sound is coming from only one channel, either left or right stereo channel. Clean your RCA outputs, check your audio cables.

The information below is from Tom Howe at CEDmagic.com

Player Category: Stereo Players
Symptom(s):
The player produces sound on one channel but not the other.
Solution(s):
Stereo players have two Audio FM Demodulator IC's, one for each audio channel, and this condition indicates that one of these chips has failed. If the single IC in monaural players fails there is no sound period. From the player circuit diagrams, it appears that all CED players with 16-pin audio demodulator IC's use the RCA CA3215E FM-IF Amplifier/Detector Limiter chip. Check for availability on the CED Parts page. If unavailable, it will have to be scavenged from a parts machine.

[Beetlescott]

Thanks so much Dean!! I checked the speakers and the only sound is the center channel, that is when it is in the ProLogic mode. I'm going to pull my receiver out tomorrow and make sure it is plugged in good, as well as clean the end of the RCA cables. If that doesn't work, I'll try switching the stylus. Thanks for all the help!
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1000 titles
SGT-250
SJT-400
Montgomery Ward
SGT-100

[Jesse Skeen]

You probably mistakenly touched the "Audio A/B" switch on the back if it's playing in mono. Don't know why they put that switch on the back, but they did- I've had the same thing happen, and if it's in the right position the Stereo light will still come on but will play in mono.

This switch is meant for use with "Dual Audio" discs, of which there were only a few. On these, the sound is encoded in stereo but to hear the "A" track as intended the player is set to mono, and to hear the "B" track the player outputs only the sound which is out-of-phase, similar to how the earlier Dolby Surround decoders worked. When playing a normal stereo movie, you can set the switch to "B" audio and hear most of the sound with no dialogue. If you have a dual-language disc and play it in stereo on a current Pro-Logic system, the Spanish dub will come from the surround speakers with the English up front.

The later players automatically force you to listen to either track A or B, but the 250 lets you just play it in straight stereo. Check out this clip from "The DisneyDisc of Mystery and Magic", at about 11 minutes into it there's a brief use of dual-audio.

http://www.youtube.com/watch?v=9RZReODrgqA
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Videodisc and stereo sound- there's no better value around!

[deantjeep]

Thanks Jesse, I did not know that about the SGT250. I learned something new today, thank you!

[Jesse Skeen]

You can also get a stereo signal with any stylus that fits, but if it's an older one made for the mono players you'll get some slight 'hissing' in one channel. This can supposedly be fixed by putting rubber on one part of the cartridge, which the stereo model stylus already has.
_________________
Videodisc and stereo sound- there's no better value around!

[deantjeep]

Thanks, I was just explaining that to Beetlescott today! We have so much we can learn from each other.

[Beetlescott]

OK I got up this morning and pulled my SGT250 out I started checking wires and I cleaned all the RCA plugins and checked the wires. and I noticed a switch I had never seen before, It said A B Norm. Mine was set on B. I jumped up, grabbed my trusty SGT250 owners manual looked up the back of the player, it said it needed to be on Norm to play normal. I switched over to Norm. I put it all back and popped in The Wrath of Khan. My first indication that all was well with the world, was when the "stereo" light came on! Then, when the big "0" popped up, all the speaker came to life!!!! Thanks Dean for your help.
_________________
1000 titles
SGT-250
SJT-400
Montgomery Ward
SGT-100

[deantjeep]

You have to thank Jesse for coming up with the fix!!!!!! Thanks Jesse, I will remember this one for the future. I also own an SGT250.

[Beetlescott]