CDROM2 wont work in the IFU

[Fidde_se]

Here's the picture I draw back then.

http://www.pcenginefx.com/forums/index.php?action=dlattach;topic=16332.0;attach=1720;image

Here's the discussion:
http://www.pcenginefx.com/forums/index.php?topic=16332.0

[Fidde_se]

Rereading that then there might be no connection between pin 20,27 and that big red area, the DC plugs traces is rather big but the ones from the CD connector is rather thin, and might burn off quite easily either in the via or the trace that it leads to on the other side hidden under the connector, a wire (like Wolfmans blue line) should fix that right up, test beep if there's any connection between pin 20,27 and that big area.

[atman]

Unscrewed the lid off the CD and it seems its connection between pin 20, 27 and the marked area..

Going to check the IFU tonight.

Is it possible if someone could check The pins from the IFU. Its mostly pin 20 and27 om intrested in..

Skickat från min E2333 via Tapatalk

[atman]

Powers the IFU with 10VDC, 2A.

IFU:
GND: 30, 22,21

Pin 27,20: to the emitter of TR101

Pin: 9,15,28,29, 30, 22, 21 = 0V
Pin: 20,27 = 9V
Pin: 1-8, 10-14,16-19, 23-26 = 5V

I really dont know which is "data" from the CDROM-ext port, there are many ports that are at 5V, dont know if 5V is "high" for the data bus or something.
The big thing is that 20 and 27 shows 9V and GND seems correct.

One thing that hits me is that when I do a measurement on the 9V it slowly decending. Can start at 9V and go down to 8V or something. Could it be that the 9V from that TR101 cant handle load?
It might drop? to.. very low?

Is it possible to get a 9-10V from the input of the 7805 and feed pin 20,27? Or cant it be the "same" power source as the console-part. Does TR101 separate the power lines as you said?

[atman]

I hooked up the multimeter on pin 27 (&20) and when I powered on the IFU I got like 5V, and it was slowly increasing up to like 8V.
When I hooked up the CDROM it dropped to like 1V. So.. Something cant handle the load.

Can I get "fresh" 10V early (like from the DC-plug) and hook it up with pin 27? I mean it should only feed the 7805 inside the CDROM.

[Fidde_se]

Yes

[atman]

Yes

Lovely!
Ill try it out!

Need to cut some traces or does it matter, I mean "backwards".

Also, another question about RGB modding. I plan to RGB mod this unit if I get it working fully.
Can I take sound L+R from the interface aswell, or do I only get sound on hucard-games? Or do I need to take the sound from the RCA L+R?

[Fidde_se]

Best to cut the trace on ifu pcb and take it from DC input directly.

RCA it is, otherwise only hucard sounds would be stereo and ADPCM and CDDA would be in mono.

You do know where in the world I am right?

[atman]

Best to cut the trace on ifu pcb and take it from DC input directly.

RCA it is, otherwise only hucard sounds would be stereo and ADPCM and CDDA would be in mono.

You do know where in the world I am right?

Yes, I figured it would be the safe way to do it, trace from 20 & 27, they are most likely connected in the contact and 1 goes to the power somewhere.

OK , I thought so aswell. Thanks for the input.

I belive you are from Gothenburg, brought a RGB amp from you, am I right?

[Fidde_se]

Right, but I usually don't sell loose amps, I leave that up to Mickris, but if it was in a cable it was definitely me, unless it was for N64.

Then there's LAB23 and Got2Pair.

[atman]

Had some luck, it was the red wire that is soldered near the CDROM2 connector, so it was very easy to cut that trace. Got 10V from after the switch so that functions as original.

And.. It worked!
Really nice!

Have just an PS1 disc available and no TV to hook it up but I can see that it says PC for some seconds after I pressed run. Guess it stops reading when its not a PCE-disc.

Thanks alot Fidde_se for helping me narrow it down.

[atman]

Right, but I usually don't sell loose amps, I leave that up to Mickris, but if it was in a cable it was definitely me, unless it was for N64.

Then there's LAB23 and Got2Pair.

Ya, that was that PCE EXT cable.
Its that 69 pin ext connector its hard to track down, your cable was really nice looking.

[Fidde_se]

PS1 games usually have CD Audio tracks and the first being DATA so jump a few tracks.

[atman]

Yes!, it seems to play the audio.

Yeey. Such a relief.


Now I have a fully working CDROM2 unit heavly yellowed. Also I got the junk CDROM which is bright white.
Dont know if I dare to change the plastic parts.

[Fidde_se]

There's usually no problem exchanging the case