Quote:
Originally Posted by rca2000
In regard to the moto JA sets....I think the biggest problem is that techs were NOT used to a SMPS power supply back in 1971. It must have been a LOT of fun checking a board over, finding a shorted SMPS out transistor, changing it , and applying power, just to hear that POP!! the instant you powered the set up--due to a shorted load or stuck oscillator. Keep in mind--these guys were still seeing totally tube sets EVERY day....and any SS sets was still strange to them.
Today--that JA SMPS power supply is old-hat--and most of us who have worked on sets for the last 30 or so years would find it's circuitry pretty familiar--and easy to deal with. A relatively simple forward-mode switcher, with horiz. rate locking. I recall fixing a few JA sets, one was a 19 incher. Have NOT seen one in over 25 years though !!
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The transition was interesting. Started with Zeniths & Admirals first
since we sold them. Others were referred to other shops that sold that
brand. RCA was next due to numbers & proved easy. Then Sylvania,
GE & the rest of the US sets. Jap sets were next in the late 70's.
At first nobody liked them including me. After a few years I never
wanted to see a tube TV again & left them for the old farts. Much easier
to deal with & the recall rate fell to near zero.
You are 100% on the SMPS. The first JA set I saw I had no idea
what it was. It even looked strange...... I started trouble shooting it
but the boss stopped me & got a board at Moto Boston. Said by the
time I got it going I could fix five other sets & not do anyone any favors.
73 Zeno
