Messages

[Console Repair/Mod Center / Re: SOLVED - Turbo Duo thinks it´s aways closed - Laserunit does nothing]

Thank you for your advice Xenogear. RA512 is fine in my duo.
My problem, like yours was, is, when "run" is pressed : No "Busy" Led activity, "Just a moment" on screen, and nothing else (no led focus, no led movement on the rail). It remains as it indifinitely.
But this problem occurs randomly. Sometimes it doesn't come for many days. Sometimes, it's here for a complete day.
Do you think I have mostly to check continuity in the area of this RA512.
By the way, do you have schematics for the cd part of the nec Duo ?
Thank you a lot.

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

Ok, i have found why ADPCM was dead.

IC503 was not grounding on pin 4. While looking closer, via near pin 5 of IC503 was corroded, that's why IC503 was not working.

So i put an electrical cable into the via and soldered each side of the pcb. It' s not pretty to see but it works. By the way, this stuff solved my main audio problem, i can now desolder Slipty's trick !

All audio problems were ground related, at least for me.



Thanks to the guy for these two diagram, I found them on this wonderful forum :

Abbreviated schematic of DUO audio circuitry, part 2:


Abbreviated schematic of DUO audio circuitry, part 1:

They are very useful !

After that, I took a second look to other vias, next to the cd side of the Duo.  I had to repair 2 others the same way.
CD works 100% now, just fine !

I'm waiting now for a RGB mod, and i have to 3d print an Hucard door cover too ! Mine was missing.

Thank you everybody for all your advices.

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

Thank you soop !!! But when i was young, i already used to mod 50hz system to 60hz !
Very interesting stuffs !

I have a problem with ADPCM too. Troubleshooting coming ! ;)

[Console Repair/Mod Center / Re: SOLVED - Turbo Duo thinks it´s aways closed - Laserunit does nothing]

I have sometimes the same issue, i'm going to have a look for  RA512 too. Thank you for your answer !

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

OK, controller received. 

Finally, i can push "RUN" ! ;) 

No cd spinning but after hack (lens was stuck so i have to remove and lubricate all what i could, it's okay. No problem with Audio-cd.

I don't own original cd games, so i burn a few iso on cdr.
Sadly, no way to launch only one game.

After playing a while with VR102 and VR104, dracula X is starting. Very cool.

But sometimes, cd player doesn't start, and I don't know why. No "Busy" light on, no lens focusing, no movement, no sound from the cd player. Screen displays "Wait a moment" and nothing after, system is idling. I have to turn OFF the duo and wait for a time. Sometimes 15 minutes, sometimes 2-3 hours, and everything works again.

Do you have an idea ? Thank you

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

Ok, it's done !
All caps soldered again !
I've grounded all the needed points too, i hope it will do the job.


4K: 180419050757568874.jpg


4K: 180419050800358092.jpg

But still no sound when i power on the duo (A little bit with jack out)
Very dissapointed.

And i begin to read again some post on this forum, and Slypty give me the solution (big thank you to him !).

Sound solved!  Sorta 

  By connecting the 2nd leg on the Op Amp (counting from the right, bottom as 1), I  noticed it would come to life by touching it or bridging it to positive output on caps.  So, I attached a wire to it and probed for a consistent audio feedback, and came to C322 as the culprit.  I just soldered the wire to the C322 positive out, finding the exact trace seems like a lot of work.

I will post a picture later.

Now, i can't continue to repair cd chapter, cause i don't have yet a controller, it is on the road...
Is it possible to simulate the "RUN" button, with a trick, to pass the "super cd rom2 screen", so i could see what happens next ?

Thank you !

[Console Repair/Mod Center / Re: PCE Duo laser and low caps issues]

Juste would like to thank you Slypty for the trick about the second leg of the op-amp and the + of the cap. Worked fine for me too ! Like you, I m going now to try to solve the CD chapter ! 

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

Today, i've successfully cleaned, I hope, the board with IPA. I left soaked it completely for 3 hours, and thanks to the brush, it looks like new. On the other hand, serial number is gone.  . I've got a picture, and will rewrite it on the pcb.



This evening, i'll try to solder again a few caps.

@++

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

Thank you too Necromancer !

Today i've spent 2 hours to decaps and to remove old solder.

Tomorrow, i will try to clean the board. I think it's going to be a hard trick, I will see at work if we have isopropylic alcohol.

I'm a bit afraid with Rosin flux, do you think it's really necessary soop ?

By the way, two solder pads are gone out due to soldering iron ! Much better with cutting pliers, at least for me ! It sucks a lot ...

[Console Repair/Mod Center / Re: [PC Engine Duo] Missing parts.]

Thank you soop for your answer.

I'm going to repair this duo without the backplate so, and i will ground the other points.

I'll change all the caps too, and, little question, for cleaning cap leakage, what is the best solution, water or isopropylic alcohol ? Nobody says the same thing on the net.

[Console Repair/Mod Center / [PC Engine Duo] Missing parts.]

Hello,

I've just ordered a duo via Ebay, and received this one from Japan.

Seller described it as no sound and no cd working only.

After opening it, the backplate under the mainboard is missing, and several wires are cutted.

Some caps are already changed. And there is no front plate too. Hucard are ok, with no sound like expected.

Is the backplate missing a "no go" for the repairing ?

Should I contact the seller about these problems ?

Thank you and sorry for my poor english