Tosh A68KJU96X Nanao MS8 not working - technical help needed

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nem
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Re: Tosh A68KJU96X Nanao MS8 -> MS9 swap

Post by nem » August 28th, 2019, 11:21 am

Looks like everything is connected as it should.

Did you have a multimeter?

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Re: Tosh A68KJU96X Nanao MS8 -> MS9 swap

Post by Benimaru » October 8th, 2019, 4:17 pm

The never ending story continues...😡
I've tried two different MS9's with the matching adapter cables. Absolutely nothing. No signs of life.
Then I've tried again the old, probably faulty, Sanwa chassis. I've received nothing but a white horizontal line this time. Not even a flickering picture anymore.
I've received a MS8 chassis today and attached everything to the tube, no adapters needed. The result however is the same as with the Sanwa: only a horizontal line...
I'm really getting desperate by now, as I don't have any clue what I could do anymore.
Does anyone of you experienced guys here have any idea what I could check next?

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grantspain
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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by grantspain » October 8th, 2019, 4:41 pm

read the vertical yoke winding impedance

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by Benimaru » October 8th, 2019, 6:51 pm

Just measured the yoke:
Yellow & Green: 5,7 Ohms
Red & Blue: 0,6 Ohms

Here's a picture of the shown line:


If I adjust the remote potis, the chassis shuts down the high voltage.

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by grantspain » October 8th, 2019, 7:40 pm

unless you have loads of faulty chassis with the exact same fault then i would say there is an issue in the vertical winding of the yoke

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by Benimaru » October 8th, 2019, 7:47 pm

That doesn't sound good...
Would you say the monitor can be repaired?
Are the measured Ohms in a "regular" range?
Last edited by Benimaru on October 9th, 2019, 12:19 pm, edited 1 time in total.

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grantspain
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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by grantspain » October 8th, 2019, 9:22 pm

you need to prove the issue before doing that, in other words you either need to test the chassis on a different tube or try a different yoke

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by Benimaru » October 20th, 2019, 1:07 pm

Here we go again...
Thanks to yosai, I was able to source down a Nanao compatible yoke pretty quickly.
Unfortunately the failure image stays pretty much the same:



It's really no fun anymore, 2 chassis, 2 yokes, 2 times the same failure?! Oh and of course I've cross checked the PSU. Same failure with a confirmed working one from another cab.
How's that even possible? Any further ideas? grantspain? nem? Have you ever had something simillar in the past?

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by grantspain » October 20th, 2019, 4:32 pm

so you put a working chassis onto that tube and you still get vertical collapse- do you also swap the remote board?

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by yosai » October 20th, 2019, 4:36 pm

I'd check the remote board connections and the cable itself. It may be that the ribbon cable has been damaged.

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nem
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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by nem » October 21st, 2019, 2:03 pm

I'm pretty sure you still have some deflection even if you have the remote unplugged.

Worth a look in any case.

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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by Benimaru » October 21st, 2019, 7:36 pm

I will receive another MS8 with remote in 1-2 weeks.
My technical knowledge is far from being a professional, but if it won't be either of the already swapped parts (chassis, yoke and soon remote board), what's left?

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nem
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Re: Tosh A68KJU96X Nanao MS8 not working - technical help needed

Post by nem » October 22nd, 2019, 10:05 am

Benimaru wrote:
October 21st, 2019, 7:36 MP
if it won't be either of the already swapped parts (chassis, yoke and soon remote board), what's left?
Nothing.

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