Quote:
Originally Posted by TVTechAlbany
E34-13, eBay no help, been there. I forgot how these beasts start, there is a startup transistor to shoot a pulse to the FBT to get the secondary supplies running (IIRC that is how the set works). Was looking for the detailed troubleshooting guide that, again if memory serves, came along with the service manuals. Then again, I might be thinking of Sony - been 40 years since this stuff was new.
Thanks.
Art
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Most common ways are
1) Zenith. an osc starts the HV via an extra pin on hoz drive.
2) RCA a small voltage from main PS kicks starts the horz, when
the secondaries come up it runs off that.
3) Others PS always running. Hoz osc is turned on / off for on/off.
If you havnt try this.
Unplug DGS coil. Run variac @90 VAC. Monitor current.Must stay under 1 amp.
Start for 1 sec. If high current usually FBT bad & its getting over current
HVSD. If it stays @ .5 A to 1 A run a bit longer & be sure the HOT is staying cool.
A normal SS color 19" + will draw apx 3/4 amp.
Zeno
