spanish Zenith System 3

[zeno]

The closest US model for your set is SM1971P
You may find a factory manual on E-Bay.
If not look for a Sams Photofact manual. The manual number
is 2010-2 for Sams. You can by from Sams but $22 US and you
get a poor PDF.
Some used Sams dealer.
http://www.theschematicman.com/
There was also a factory training manual. IIRC they called
it the XXX chassis. Zenith stopped using real chassis numbers
about 1979.

Your 13" looks good. one thing to check is a cap on the 9-160.
IIRC its 10mf 315V & on the right rear near the FBT. Very
common & causes many symptoms. Another thig is on the 9-155
look for open resistor from G2 control.

73 Zeno

[tritwi]

Thank you Zeno! I will try to get a proper service manual as I would love to have these tvs working fine as is to expect from a Zenith product. I will try what you suggested for the small 13" tv. Never opened it so I expect an extra cluttered space inside. I noticed the 19" has the trifocus picture tube and two focus electrodes. How peculiar! The 13" picture tube has areas of discoloration you can see when the set it is turned off. It seems like water entered inside the faceplate. By the way the tube seems good working.