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Topic: Repairing a Sankyo Stereo 800 - The Journey
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Pete Richards
Master Film Handler
Posts: 302
From: Australia
Registered: Sep 2010
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posted July 06, 2013 08:42 PM
That is good news then!
I find that a bit baffling though... Can you check, if you switch the lamp between High and Low output, does it change?
If it does, can you check the voltage on the lamp wires again, the ones next to the H L switch.
It means that the transformer is at least partially working, as the lamp gets its power from there.
There are multiple outputs from the transformer though, and one may have blown. But it does mean the blue wire is okay, and the 240v and power selection wiring is working to get power to the transformer, which is good news.
Can you double check those first two test points I mentioned to see if they are getting the 15v power now?
BTW, the dropbox link didn't work for me. Could you send them via wetransfer.com to me? My email is peter at mudgee dot net thanks!
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Pete Richards
Master Film Handler
Posts: 302
From: Australia
Registered: Sep 2010
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posted July 10, 2013 06:30 PM
Thanks for the video, it makes things so much more clear. I will make one up this weekend of testing all the main components for you and show the meter settings etc. I think it is the best way after seeing your vid.
Just a quick note re the meter. It is fine for the task, I'd just buy a better quality set of test leads.
Now with that meter, (sorry if you already know all this) the settings for voltage work like this.
Your meter needs to be set to the maximum voltage you are likely to expect. So if you were testing the house mains power (110v AC in the USA), you would set it to ACV 200, and then it will give the corect reading. If I was to test the mains in Australia (240v) I would have to set that meter to ACV 750, as our voltage is higher than the 200V setting on that meter, so we need to move up to the 750V setting. Now you could of couse test the 110v on the 750V setting, but it wouldn't be quite as accurate.
For the DC Voltage, your meter has settings for 1000Volts DC, 200V DC, 20V DC, 2000millivolts DC (same as 2V DC), and 200mv DC (same as one fifth of 1V).
So if you were testing a 9V battery, you would set the meter to 20V DC. If you were testing a little circuit with tiny amounts of voltage (say 80 millivolts) yoy would set the meter to the 200mv setting and so on.
In this case, the readings you are getting are only a few millivolts, and are swinging around wildly, so something is wrong somewhere.
If you could check your meter is working properly, by setting it to 20V DC and placing the probes on a normal 1.5V battery or a 9V battery and check that you get a reading of 1.5V or 9V on the meter. (ie any standard batteries you have around the house).
If the meter is reading correctly, then I will make up a video for you and we can test all the various bits and track down the problem.
We will be testing some individual componets, like resistors and rectifiers etc. and checking voltage levels across the board in AC and DC. I have a meter with a similar layout to yours, so I will use it.
[ July 10, 2013, 10:18 PM: Message edited by: Pete Richards ]
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