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Author Topic: K7000 Not Powering Up  (Read 2281 times)

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MK3FAN

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K7000 Not Powering Up
« on: May 19, 2009, 06:48:47 pm »
Hey guys. I have a K7000 chassis. First it was blowing fuses. The HOT and the IC4 were shorted. Replaced both of them, now the chassis does nothing when powered up. I have 74VAC at the fuse. I tested all the pathways and reflowed all the solder points I compromised and it made no difference. I need help. Any ideas? If you need more info, let me know.
Current collection - 28 cabs, 4 pins. (32 machines and not enough room)

SirPeale

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Re: K7000 Not Powering Up
« Reply #1 on: May 19, 2009, 09:32:37 pm »
What do you have @ the power input?

Kevin Mullins

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Re: K7000 Not Powering Up
« Reply #2 on: May 19, 2009, 09:55:01 pm »
I have 74VAC at the fuse.

Is that from one of the mains inputs to the other? (which would be the fuse)
Not a technician . . . . just a DIY'er.

qrz

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Re: K7000 Not Powering Up
« Reply #3 on: May 19, 2009, 09:57:44 pm »
schematic here : http://www.wgec.com/pdf/Service/K7000.pdf

also check r103, c56, c57


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MK3FAN

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Re: K7000 Not Powering Up
« Reply #4 on: May 19, 2009, 10:09:38 pm »
Thanks guys. Here are some stats. D19-D22 are good. The HOT is good. IC4 is good. R301 is good. R103 is OPEN. When I test for power, one lead is on chassis ground, the other is touching the component. I have 74VAC on both sides of the fuse and no 115VAC anywhere that it's supposed to be. I'll stick a new R103 in and see what happens.
Current collection - 28 cabs, 4 pins. (32 machines and not enough room)

MK3FAN

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Re: K7000 Not Powering Up
« Reply #5 on: May 19, 2009, 11:24:59 pm »
Fixed! Replaced R103 and it powered up. Only now, I have ridiculously bad images/picture. The flyback is making all kinds of weird noises and their is no red displayed. That's most likely one of the neckboard transistors, but I still have horizontal stretch issues, vertical stretch issues, color issues, it's really ridiculous. I'll start with a cap kit and a new flyback and see how much that helps. Thanks again guys. 

« Last Edit: May 19, 2009, 11:36:39 pm by MK3FAN »
Current collection - 28 cabs, 4 pins. (32 machines and not enough room)

qrz

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Re: K7000 Not Powering Up
« Reply #6 on: May 19, 2009, 11:38:52 pm »
When I test for power, one lead is on chassis ground, the other is touching the component. I have 74VAC on both sides of the fuse and no 115VAC anywhere that it's supposed to be.

that is why the voltage is reading low .  u wish to measure the raw AC.  which,  is not referenced to chassis ground .
measure across the ac input to the rectifiers......
this is also a "hot chassis" requiring line isolation  ;)


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