Quote:
Originally Posted by Palinurus
The module that I have is a 9-86-02E. Though it wouldn't interchange with other versions, would the IC's be the same?
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There are several suffixs that will sub the -02. I *think* any sub that is even number will work, but I'm not positive. There are people I can call that will likely remember.
In the meantime, some of this is coming back to me. Check the 24V regulator carefully for output. The regulator is a TO-220 mounted on the front of the chassis near the breaker. It has to be exactly 24v on the emitter.
Also, there are some electrolytics in the 24V feed on the back of the chassis that cause havoc. These are radials and are physically large. Check or just replace any of them.
Lastly, I recall a problem with an open coil causing loss of 24V to the chroma module. I'm pretty sure it's terminal W9.
And again, pull the ICs and clean the pins and reinstall - that fixed most of them. And I do believe that all versions of the -86 used the same ICs, even if the boards didn't sub. There's an outside chance I may have one. If I do, it's yours.
I'm pretty sure I still have the Zenith service data for those years. I'll check tomorrow when I get to work.
John
EDIT: if you need to replace a capacitor or inductor on the back of the chassis, do a clip and loop method. The components are soldered deep into the back of the module contacts, and the less stress put on the module contacts at this age, the better.