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Author Topic: Ceronix 1493 too white/lines/shuts off  (Read 727 times)

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Offline Badbaud

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #20 on: October 09, 2017, 08:04:58 PM »
There was one for the 1492 and two for the 1493 13" vs 17" size tubes.

Offline smoothgrh

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #21 on: October 09, 2017, 09:12:20 PM »

Does anyone know what the extra pin does?

Thanks for the comparison pics!

Offline Amechanic

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #22 on: October 09, 2017, 10:01:21 PM »

Does anyone know what the extra pin does?

Thanks for the comparison pics!


Badbaud might.. I'm just a self taught novice, he's a repair tech.
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Offline Badbaud

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #23 on: October 09, 2017, 11:08:16 PM »
It looks like a ground. Ohm the pin hole to ground and see if it is connected to ground.

Offline smoothgrh

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #24 on: October 10, 2017, 04:05:46 PM »
I'm not at the shop right now but the 93 uses something like a 1561....


Thanks badbaud—you were close: the Ceronix 1493 uses a 1516 flyback.

Offline smoothgrh

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #25 on: October 13, 2017, 01:45:48 PM »
It looks like a ground. Ohm the pin hole to ground and see if it is connected to ground.


My friend says: the pin hole on board is connected to a 2.2k resistor, then to other electronics. Page 23 of https://www.ceronix.com/dlfiles/manuals/1493_SVCMAN.pdf

I believe trace 466 is where the pin goes. But the resistor it shows that's connected is 470ohm, not 2.2k—so something's weird.

There's another rabbit-hole aspect: the schematic calls for a Meritron T-8090B flyback, but the NOS flybacks that Ceronix sent are T-8090A—they're labeled as a 1516 flyback and the item description says Flyback Transformer 31Khz #T-8090, no mention of A or B. (The old flyback might be a Hitachi.)
« Last Edit: October 13, 2017, 02:22:49 PM by smoothgrh »

Offline smoothgrh

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Re: Ceronix 1493 too white/lines/shuts off
« Reply #26 on: November 11, 2017, 09:27:16 AM »
Epilogue: monitor fixed! :applause:


We purchased a NOS CPT1516 flyback from Ceronix, which was a Meritron 8090B.



My friend says:


Some of the Ceronix 1493 VGA models were shipped with a flyback that did not have an internal capacitor—which is what the extra pin is connected to. On these units, resistor 465 (480ohm 1/2W) was not needed and also not installed. I missed this originally as there is solder in the attach points from the original reflow, but no component was installed when looking from the other side.   


Installing a 10-cent resistor from a surplus store solved the problem and the monitor looks great now. 


Here's what it looks like (yes, I bought another game while awaiting it getting fixed): https://youtu.be/rZwasqK63hM


 

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