:: ROAD TRIP :: BUGGY BOY by TATSUMI [presented in triple screen]

[DarthNuno]

I think i have downloaded it in the past the schematics for the game.
Can you do something with it?

https://drive.google.com/file/d/0B_GljfKEdEVmYkl3bjctaGluZEE/view?usp=sharing

Thanks a lot 
Well, Im not sure it's the schematic for the Buggy Boy *triple screen* board version, but its a very good start 

The "scribbles" on the ICs were done as to "hide" what chips were used for pirates/bootleggers.
Often also the markings were simply sanded off.

Yeps, it make senses.

That extra board as a very old EPROM on it....weird. it says TILT on the label.....even weirder
Maybe a credit board ?

yes, I'm guessing that too. I'll follow the wires to have an answer 

Bruno, I don't know if this will be of any help to you, I just noticed that on the arcade boneyard site they are currently breaking up a speed buggy for parts.

Thanks for the link, I'll contact him although it mentions Speed Buggy 

[DarthNuno]

OK, also got this NOS Hantarex polo 14" monitor   



New vs old :



So let's replace the chassis with the vertical deflection problem (right screen), and now we are here (without any geometry adjustment yet)  :



Yeah, picture looks as great as we can expect from a new monitor  Note that I didn't put the brand new tube so far...

Still the monitor in the middle to fix (the red color is missing)...

[xadhoom]

Fantastic!!!

[Arch]

Instant boner! 

[Ianski]

Fantastic!
I would be tempted to swap the middle monitor for the nos one, as thats sort of the most important.

[spectroman]

great work

[jcp]

At last .
Ianski : that was my first idea too.

Bruno : you should "capkit" the left monitor too (HTX MTC-900E).

[spectroman]

I've received the polo board :

there is a lot of dust



After a shower, I can work on it :



When I've power it, there are sparkles on the strap p133

I look the bottom of the board and I found that the pcb was burn around p133, r167



I've clean this area, and cut a useless track (from net -190V for the Xray protector) :



I've replace a rusty resistor & a leaking cap :



Now there is no more sparkle, but the vertical deflection is still missing.

I've check the TDA1675A :
- power is good 25V (stable)
- verticales pulses arrived at the sync IN

But the oscillator didn't start, there's no ramp at the pin 9, I think that the amplifier was died, I've to found a new one.

[Alpha1]

Nice work

I wish there were mode 3 screen Buggy Boys found. I used to play this one and loved it.

[spectroman]

I've get one TDA167x from my own  working board, and I replace it :



I've a dirty screen crt 14" (pickup recently), but it doesn't have the good crt socket :



So I've test quickly (less than 30 sec) on my 25" (I know that's bad ), I've strange color order, but my pattern generator has the correct pin order for mtc9xxx, and the blue and red pin are swap on polo



usually, I've this :



There's a lot of glitchs on blue color, I think that a capkit will solve this issue

[spectroman]

The other buggy boy monitor, the mtc 900/E, have some broken parts, maybe a shock with BPOST :









I don't have a mtc 900/E to take spare part, can someone send me the power resistor and the B4 coil (linearity coil)?

[DarthNuno]

That is awesome Fred! 

Ok, just found in my "what to do with?/untested parts" area an MTC900E if I ready correctly... Maybe you can use parts from that one? Let me know 

[spectroman]

Good, I need this parts. I'll take them at the BGS

[xadhoom]

Great job Fred!

[spectroman]

I've made a capkit on this board, but there are still glitches on blue  



I was hoping that the replacement of the 10µF on blue signal will solve this problem.

So I've check the input impedance on all color's pin, all have same.

I get my scope, and I find that the output the first transistor is not stable, and the junction BE is around 2V

I replace the BC548 and :



the board can return to it's owner

@bruno : you will have to tune the geometry, synchro and color on your own screen