Problem with direcional on games.

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By hardheavy

Resident (52)

hardheavy's picture

21-04-2011, 02:32

I took some pics fo the joystick board, the original( theorically fixed) and the "new", bought last week . And i changed the fixed for the new, but the problem remains. The two grey wires on the side is the LED source.
The last pic is the "new" board-circuit.

This is the fixed original circuit.
i232.photobucket.com/albums/ee199/Pasha_br/DSC00859.jpg
i232.photobucket.com/albums/ee199/Pasha_br/DSC00857.jpg

The new joystick circuit.
i232.photobucket.com/albums/ee199/Pasha_br/DSC00865.jpg

By flyguille

Prophet (3028)

flyguille's picture

21-04-2011, 04:09

the resistors on the side are all "pull ups", that make that when the input is not grounded (like moving the stick) at bit level it returns (1) , when you move the stick UP, the joysticks grounds the line, so it reads (0), there is two things, as you already changed the little board, it is obvious a problem in the mainboard

can be some big problem like the input at the engine just broken (doing short circuit to ground).

but can be some tiny problem like the track just cutted (open circuit), so the "open collector pin of the engine don't receive the pull up voltage"

ah checks also the wiring. with a continuous meter

By hardheavy

Resident (52)

hardheavy's picture

21-04-2011, 05:17

flyguille:
Thank you!. I have a multimeter and i´ll check . But i have a doudbt: where i can start cheking? any clue?

By Jipe

Paragon (1551)

Jipe's picture

21-04-2011, 11:50

there is can be have a discharge of static electricity at the time of the solder to make repairs
when the plate of the joystick is removed the test gives it always the movement has one ?
check the wire and sold on the main board and clean it with a solvent

By hardheavy

Resident (52)

hardheavy's picture

21-04-2011, 14:25

When the joystick board is disconnected from main board, Popolon doesn´t go to the top of the screen anymore. But it moves just in right-left direction.

By hardheavy

Resident (52)

hardheavy's picture

21-04-2011, 14:27

I left only the joystick board to repair. So i don´t think that some static may caused mal fuction. I purchased this msx on march 2011 and this problem already exists.

By flyguille

Prophet (3028)

flyguille's picture

21-04-2011, 16:13

that is because now without that board attached, any line UP DOWN LEFT RIGHT, has NOT its PULL UP resistente to +5v.... so the software understand &B0000 = something to do ...

and by that reason that is not a proof that it is the joystick little board. Because now, all the lines behaves like the broken one.

By hardheavy

Resident (52)

hardheavy's picture

21-04-2011, 21:02

that is because now without that board attached, any line UP DOWN LEFT RIGHT, has NOT its PULL UP resistente to +5v.... so the software understand &B0000 = something to do ...

and by that reason that is not a proof that it is the joystick little board. Because now, all the lines behaves like the broken one.

Understood. Smile

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