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  1. Thread: Chase HQ DX

    by Kaizen
    Replies
    52
    Views
    6,314

    Definitely, all the boards I have here have ram...

    Definitely, all the boards I have here have ram and other issues I need to sort out.
    Shoot me a PM with prices when you get time.
    It's near impossible to find the motor driver PCB's.
    I'll be...
  2. Thread: Chase HQ DX

    by Kaizen
    Replies
    52
    Views
    6,314

    I'm taking another look at the Drive Logic PCB...

    I'm taking another look at the Drive Logic PCB for the motion control and want to read the three PAL16L8's to make sure they're not faulty.

    https://i.imgur.com/zdd4IiS.jpg?1

    I have no...
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    You could try contacting The Guru to see if he...

    You could try contacting The Guru to see if he has a dump of it.
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    1,486

    Ryan555, I'm happy to help where I can mate. PM...

    Ryan555, I'm happy to help where I can mate.
    PM sent.
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    919

    I tested the monitor, PCB and cab wiring. All...

    I tested the monitor, PCB and cab wiring.
    All good but the monitor is too big so I'll see if I have a 48cm CRT TV that I can RGB mod for it.
    I've ordered an original remote for the TV as the image...
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    919

    Not long after getting this cab up and running...

    Not long after getting this cab up and running the chassis decided to die and the cab has sat dormant for the last two years, I've since robbed the power supply and used the SI 3-Layer PCB for...
  7. Shane's Board #2 This board just showed the...

    Shane's Board #2

    This board just showed the image below on screen when first plugged in.

    https://i.imgur.com/Tetk1mz.jpg

    The 7440 at E4 had a stuck output pin.

    After replacing it I got an...
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    494

    93C46 eprom.. ...

    93C46 eprom..

    https://au.mouser.com/datasheet/2/268/Atmel-5193-SEEPROM-AT93C46D-Datasheet-1368629.pdf
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    Yeah definitely, can't see a difference at all.

    Yeah definitely, can't see a difference at all.
  10. Replies
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    1,486

    Yeah it's a genuine Sega Shinobi.

    Yeah it's a genuine Sega Shinobi.
  11. Mirco 'Challenge' 4 Player Pong - PCB Repair Log #3

    Shane's Board #1

    I had another Mirco pong clone PCB on the bench, this one had a fault with the horizontal ball control and the score display was messed up.
    The paddles dont display if not...
  12. Replies
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    I found this one a lot easier after already...

    I found this one a lot easier after already having done one on the same chassis, there's plenty of locations with through holes and if I spent a but more time looking over the board I probably could...
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    1,486

    I didn't have any 680/750Ω resistors on hand and...

    I didn't have any 680/750Ω resistors on hand and thought it would be good to be able to tweak the voltage if needed so I built a small board with 1kΩ trimmer pots (preset to 700Ω) and added a 1kΩ...
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    https://i.imgur.com/a49YfJ4.jpg Yeah...

    https://i.imgur.com/a49YfJ4.jpg






    Yeah it's definitely pot luck.
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    The resistors are all surface mount... ...

    The resistors are all surface mount...

    https://i.imgur.com/xAPFYaj.jpg

    I was thinking it might be easier doing the mod at the RGB Switch location like the last one.
  16. Replies
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    No Teletext chip unfortunately.

    No Teletext chip unfortunately.
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    Yeah once again trying to do stuff from my phone,...

    Yeah once again trying to do stuff from my phone, link removed but it should be the same as the 14" JVC which you just linked to.
  18. Replies
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    1,486

    Okay, the next TV I found was a JVC AV-21FT and...

    Okay, the next TV I found was a JVC AV-21FT and has the same chassis and chips as the second one I modded.
    This should be reasonably straight forward and I've tested this one out first.
    ...
  19. Replies
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    1,486

    Unfortunately I plugged the TV in, the red light...

    Unfortunately I plugged the TV in, the red light came on, pushed the channel up button, the red light went dim then solid again.
    I spent a couple of hours checking some of the transistors, diodes...
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    Thanks Mark, this monitor will be used in a...

    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...
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    Yeah I should have looked at the schematic on the...

    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.
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    I grabbed a 21" TV from the stash and had a quick...

    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_chassis_cp21sw1.pdf/download.html

    The...
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    Doh, the mod has already been done and tested,...

    Doh, the mod has already been done and tested, will definitely do the mux option in the next one.

    https://youtu.be/yzHHIEkd7Eg

    The other TV doesn't have a blanking option so I may do another...
  24. Replies
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    1,486

    I like the idea of being able to tweak the values...

    I like the idea of being able to tweak the values so I might make up a small Vero board with the four pots as mentioned.

    https://i.imgur.com/eA84qfH.jpg

    I'm re doing my test bench setup tonight...
  25. Replies
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    Yep, a good source which is where I found the...

    Yep, a good source which is where I found the manual for the JVC TV.
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