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Thread: Connecting an Arcade PCB to a CRT TV

  1. #41

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    I grabbed a 21" TV from the stash and had a quick look at the schematic.
    It's a Sany CP-21SW1, link to mamual here...

    https://elektrotanya.com/sanyo_ac3a_.../download.html

    The OSD out goes through a transistor, resistor and inductor on each of the lines that are powered by the VDDA output on the same chip.



    I'm not sure what the VDDA is/does at this stage but I'm guessing that it won't interfere with the mux method. They go through caps just after the inductor and then through some 5.6k resistors before going into the Jungle Chip.



    The Blanking also gets a feed.from the H and V Sync, not sure if that will affect anything, I'm guessing if a composite signal is connected it will automatically blank...

    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

  2. #42

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    IC201 is your jungle. The RGB inputs are on pins 30,28 and 23.


    Sent from my iPhone using Aussie Arcade

  3. #43

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    Yeah I should have looked at the schematic on the PC and not my phone, the chip in the first pic above is the Teletext output and the chip in the second pic is the OSD output.
    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

  4. #44

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    For the OSD Mux I would consider cheating.

    Iíd remove R221, R222 and R223 and inject 75 ohm terminated RGB into the RGB circuit, maybe on the text header via 1K resistors.

    For blanking I would tie 5V to a 3900R and to the leg of resistor R850 farthest from the micro controller IC801. Use a switch on this line if you want to disable.


    Sent from my iPhone using Aussie Arcade

  5. #45

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    The blanking circuit is a quick and dirty way to mimic the micro controller blanking.


    Sent from my iPhone using Aussie Arcade

  6. #46

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    Thanks Mark, this monitor will be used in a dedicated Spacies cocktail so permanently connected to RGB is fine.
    I just finished setting up the first monitor on the test bench so I might have a go at this tonight.
    Did you mean 390R resistor?
    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

  7. #47

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    Nope, I meant 3900. Same value that R850 is.

    Something of a similar size should be fine.

    The TV has an inbuilt voltage divider using R850 and R851, both 3900. This means that 2.5V is going to the jungle because the micro controller chip will be outputting 5V from pin 39.

    Iím not sure exactly the blanking voltage for this chip. By sending 5V into a 3900R onto the leg of R850 farthest from the micro controller we will be sending 2.5V to the jungle.


    Sent from my iPhone using Aussie Arcade

  8. #48

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    Oh, and thatís a clone of a Mitsubishi jungle M52771ASP


    Sent from my iPhone using Aussie Arcade

  9. #49

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    Connecting an Arcade PCB to a CRT TV

    Blanking voltage should be from 1.2V to 3.3V according to datasheet.

    So that should help you work out what resistors will work on your 5V line.


    Sent from my iPhone using Aussie Arcade

  10. #50

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    Anything from 2K up to 10K should work.


    Sent from my iPhone using Aussie Arcade

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