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#1
12-03-2015, 01:20 PM
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Ts18 chassis Motorola
I got this ts18 chassis and no pic at all no matter what I do and the sound I get very little at max volume, could this be a result of a bad 1n34 diode? I adjusted the adjusters along the IF tubes but put them back when It made no difference for sound or a hint of a pic.
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#2
12-03-2015, 04:20 PM
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Could be. Or a bad tube or an open IF transformer or problem with the video amp.
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#4
12-03-2015, 04:31 PM
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There are several IF transformers - they are what you referred to as the 'adjusters'. The audio is pulled off right after the video amp.
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#5
12-03-2015, 09:02 PM
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There are several dog bone type capacitors in this chassis, can they be replaced with Micas of the same value or just use ceramic disc. There is 100pf and 250pf in the verticle section. I know the price for Micas are more then disc but will they perform the same.
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#6
12-03-2015, 11:56 PM
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Those tubular ceramic capacitors are very stable and reliable. Much better than cheapo ceramic disc caps. I wouldn't replace them until you've eliminated any other source of trouble. If you do, replace with either mica or C0G type ceramic.
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#7
12-13-2015, 03:02 PM
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Ok this one is for bandersen , still have very little audio and no picture at all so I was wondering if having 2 .001 ceramic caps in the horiz circuit rather then the right ones would be responsible for the loss of video and audio. These caps came with the chassis.
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#8
12-13-2015, 03:30 PM
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No they wouldn't. Could be the diode you asked about earlier or issues with the tuner or IF.
Also, these sets were preset to receive only eight out of 12 channels. Could be you are feeding it one it wasn't preset for. How are you feeding a signal into it? Can you try other channels ?
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#9
12-13-2015, 03:37 PM
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This chassis I had bought and was listed as a working chassis but you know things have to be gone over because it didn't work but is has been recapped and looks ok. So I'm using the same signal as I use with my other Motorola tabletops. And I have it on channel 3 with the matching transformer and tried another thinking the trans was bad but no different. I kind of did an audible check on those if transformers and I used a digital Volt ohm diode check and they all beeped as if they were not open that's really the only way I thought was a good way to check them.
Last edited by timmy; 12-13-2015 at 03:56 PM.
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#10
12-13-2015, 04:41 PM
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Your set might not be adjusted to receive channel 3. Can you feed it a signal on channel 4 ?
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#11
12-13-2015, 05:21 PM
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Well I changed it to 4 and that channel don't even have Alittle sound , only 3. So I may have to adjust all those trans and hope I can get it, of course after I try another 1n34 that I got from another chassis ? I have the tv signal hooked to the ant screws on the back.
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#12
12-13-2015, 06:33 PM
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Ok well I kind of used wire clips with another 1n34 no difference. So I don't know but am I now to screw around with these IF adjustments until I get something or is there something I should watch out for?
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#13
12-13-2015, 07:47 PM
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Quote:
The video IF adjustments are factory pre-set to give the correct video bandpass, and the settings are hyper-critical. They should never, ever be screwed with. If you do, you'll introduce ringing and/or smearing-out of fine detail in the pic that's next to impossible to correct without a full instrument alignment. You can generally get away with tweaking the sound IFs a bit, but never the videos
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#15
12-13-2015, 10:19 PM
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 Yikes.
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