GFX9000 on Sony KX-14CP1

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By Manuel

Ascended (17250)

Manuel's picture

05-12-2020, 12:54

But how is pin 16 connected from the GFX9000?

By Mumbly

Expert (77)

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05-12-2020, 20:00

There is a 5v outpout on every GFX9000 but I don't have the pinout of your version

By Mumbly

Expert (77)

Mumbly's picture

05-12-2020, 23:17

based on that document http://www.msx.ch/ftp/Products/Video9000/USER%20Manual/v9man...
Pin 6 at the GFX9000 connector side (status RGB) is the 5v we need on pin16 scart side.

By KdL

Paragon (1363)

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07-12-2020, 11:37

Manuel, I want to clarify that the image becomes dark when the Sony decoder inside GFX9000 is not powered correctly. It is sufficient to check with the tester that there is a sufficient voltage of not less than +5V when the cartridge is inserted. You can compare the same voltage on the Turbo-R and see if there is a difference between the two MSX machines.

By Manuel

Ascended (17250)

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07-12-2020, 19:17

I'm not sure why you are mentioning two machines.... Where to test the 5V exactly?

By KdL

Paragon (1363)

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08-12-2020, 00:23

In the first post you said: "Video works fine with the RGB out of my turboR" and I thought you meant with GFX9000.

However, it is necessary to test pin 45 and pin 47 of the GFX9000 comb.
If the voltage is less than +5V, the image will be dark.

https://www.msx.org/wiki/MSX_Cartridge_slot

By Manuel

Ascended (17250)

Manuel's picture

10-12-2020, 21:27

OK, thanks. I was talking to normal RGB out of the FS-A1GT and the RGB out of the GFX9000.

pin47 and pin47 of the cartridge slot, do you mean?

By Meits

Scribe (6133)

Meits's picture

10-12-2020, 22:49

pin 45 and pin 47 of the cartridgeslot. They supply 5V.
One probe there and one probe on pin 41 or pin 43 or any screw in the machine which are all GND. Better do the latter. That's less clumsy and way saver.

By sdsnatcher73

Paragon (1322)

sdsnatcher73's picture

11-12-2020, 06:18

And I think you should actually measure it when the GFX9000 is inserted because the cartridge itself may affect the voltage level if the PSU is insufficient. But you could do that as step 2 if step 1 shows correct voltage. I guess you could then manage voltage supplied to the Sony chip on the GFX9000 directly.

Another thing to do is try another machine (or several) and see if GFX9000 works well. If it shows the same issue on these machines that Sony chip may just be failing.

By KdL

Paragon (1363)

KdL's picture

12-12-2020, 00:17

Manuel wrote:

OK, thanks. I was talking to normal RGB out of the FS-A1GT and the RGB out of the GFX9000.

pin45 and pin47 of the cartridge slot, do you mean?

Yes Manuel, you need to measure the voltage of pins 45 and 47 on the slot while the GFX9000 is inserted.
It should stay in the +5V ~ 5.25V range to work perfectly.

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