|
There will be a label either on the inside of the back cover or on the inside of the main cabinet.
Sets with the 9-160 module sets have said module laying in the bottom of the cabinet. This module contains the flyback transformer and power supply components.
Sets with the 9-186 module will have said module standing up to the right when looking at the set from the rear. This module contains the flyback transformer and horizontal output components. The signal module will be a 9-181 and will be laying in the bottom of the cabinet.
The biggest problem that the 9-160's had were shorted horizontal output transistors that were usually caused by a boatload of bad solder connections. There was also a big diode behind the flyback that will short. And, I've seen a bunch of them where the flyback transformer would arc, burn, catch fire, and/or sound like a machine gun going off when they went up.
The 9-186 sets can be a bitch to fix if they are dead. Sometimes, one module can fail and take out the other module. I've had these sets that would not fire up and I couldn't find a thing wrong; but, I could swap the modules to restore operation. It got to the point than when I was fixing one of these for a customer and couldn't figure out why it was dead, I'd give them an estimate for replacing both modules. So, this is not my favorite chassis; but, those sets do perform OK when they work and the set I own uses this chassis. I'll use it until it dies and if I can't easily fix it, it will hit the dumpster. I think Zenith's whole intent on these sets and the older 9-160 sets was to repair them by replacing the modules. I don't think they wanted you to fix them to the component level.
IMHO, the best Zenith's were the chromacolor II sets of the '70's. Those had their problems; but, they didn't have any weird power supply or sweep circuits and they were fairly straightforward to troubleshoot.
|