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ITC Series 1 power supply

H

HadYourPhil

I need to 'recommission' one of these guys for awhile, but this one is dead. The power supply, one of those nasty switch mode supplies, needs help. Any of you have any hot tips on these vintage guys??
 
Must say I am astonished at the lack of replies to this post. Guess I am the first in history to have an ITC power supply problem!
 
The capactiors usally fail in switch mode pwr supplies, the oscillator doesn't work, and there you are.
I've replaced many such supplies in OEM equipment with off-shelf replacements from Newark Electronics.
It's not worth the time to repair this type of supply. They work pretty dang hard to offset the savings of not having a big transformer.
In many cases, an old-fashioned linear type supply with a big transformer is more reliable in the long run. (IF you have room for it.)
 
No question in my mind that switch mode power supplies are VERY user unfriendly. They are all but impossible to repair, and in the case of Sony Betacam decks, horribly expensive. I'll run the ol' ESR meter over this one...
Thanks for the post which told me what I expected. I was hoping someone would go "Oh yeah... It's such-and such."
 
Phil said:
No question in my mind that switch mode power supplies are VERY user unfriendly. They are all but impossible to repair, and in the case of Sony Betacam decks, horribly expensive. I'll run the ol' ESR meter over this one...
Thanks for the post which told me what I expected. I was hoping someone would go "Oh yeah... It's such-and such."
Click to expand...

I have three old Series I decks, never had a power supply failure.

Yep, switching supplies are a PITA. Last time I worked on one (Panasonic MII deck), all of the electrolytics had let loose...goo all over the board. Shotgunned all of the caps, and still had one dead section. Eventually found an open 220-ohm 1/8W resistor. Once you add up the bench time, it starts to make more sense to replace, if you can.
 
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