I Have posted before about this set stumping me. I brought it home a few years ago with little or no vertical sweep and only a hum for sound that is adjustable with the volume control. I thought it would be the typical capacitor problems that most old sets have, especially with the hum.
Well I replaced nearly every capacitor in this set with the exception of the ceramic disc type and one paper cap in the horiz. section. I checked and changed a few resistors too. I still have the EXACT same performance from this stubborn set.
Not one bit of improvement. I couldnt believe it. One of the thrills of replacing caps and resistors is watching the lifeless slowly come back to life.
I'm hoping there is someone who is really familiar with this type chassis and its typical problems. The set is a Space Command and I have wondered if a short in the remote chassis could somehow cause the main chassis to go whacky. I cant see it effecting the vertical sweep. If memory serves me right I tried unplugging the power connector to the remote chassis and the set does not power up like that. I may be wrong.
All the tubes check out. The power supply, horiz, and HV work fine but thats it. Just hoping for some clues on where to go with this. I have heard that the Zeniths of this type and time frame were very good performers producing a superb picture. This chassis design was used for several years so I hope for some good results as far as our great knowledge base.
08-28-2007, 10:22 PM
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