What are the common voltage outputs from the power supply ? I am repairing my first VCR with power supply issue and cannot figure out what should I expect in good working one.
I see 21V and -7V and many other pins with 0V.
No such thing as "common voltages". What's the make and model?
And, as someone else shouted, do take care around the power supply.
--- sam | Sci.Electronics.Repair FAQ Mirror:
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Relax tiger... I know what the high voltages are, I worked with TV sets already. There you have much more things to worry about than some stinking 120V ;-)
Sure, it is Zenth VRM4150. Any schematic available for this one or similar model ? Or any other VCR for that reason to just get an idea what to look for ?
You guys are right, and I am carefull. I have experience with voltages. Do not worry, but thanks for worrying anyway - it was nice of you :-)
already.
Of course keep in mind that a self respecting switcher will have 300 VDC in it somewhere. :)
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Sure... but this one in the Zenith is not a self respecting one ;-) The main capacitor is rated for 200V.
Yep, no doubler. :) The >150 VDC or so on that cap can still be lethal though.
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though.
Do you know this Zenith VCR ? Any info on voltages at the power supply output ?
I tried to search for VCR and power supply and could not find anything in FAQ. What is the correct keyword set to get any info about this subject ?
though.
You go to the repairfaq page, and look through the table of contents. There is one about VCR's and there is one about switching supplies, I think using the complete term "switch mode".
Michael
On Thu, 18 Aug 2005 15:04:34 -0500, "Pszemol" put finger to keyboard and composed:
At the very least you must have +5V for the standby logic. You should find it on the front PCB and/or on one of the three (?) pins of the remote sensor.
- Franc Zabkar
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Very good point! And even this one is not existing... So it looks like the pwr supply itself is the problem, not the short on mb pcb.
Thanks, I have found an example schematic there:
There may not be a +5.
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On 23 Aug 2005 17:42:45 -0400, Sam Goldwasser put finger to keyboard and composed:
That's all I ever remember seeing. What other voltages are commonly used?
- Franc Zabkar
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I don't know what's common but there really isn't any requirement for specifically 5 VDC in a VCR. It's not TTL. I seem to recall that the typical Panasonic power supplies had something slightly off like 5.1 or 5.2 But no reason it can't be 6 V something else.
--- sam | Sci.Electronics.Repair FAQ Mirror:
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There should be at least something between 5 and 8 volts or something between 12 and 16 volts on most VCR's.
-- Met vriendelijke groet, Maarten Bakker.
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