CDROM2 wont work in the IFU

[atman]

I have the standard "briefcase"-IFU setup.

I just had a PC Engine and the IFU to play with and I decided to buy a CDROM2 to the rig.
It was confirmed to work, and i is working IF i use it seperatly as a CD-player. Works really good.

But when I gonna use it in the IFU its dead. I suspect there is no power to the CD from the CDROM-EXT port.
Is there anyone that have a schematics for the CDROM-EXT-port?

And when I power on the IFU by slinging the front switch the CDROM should have power?, like should I be able to press play and get some sort of activity? (like when I have the CD connected to an external source)

Tried a 2.5A power supply with no luck. The PC-Engine itself works fine in the IFU.

[MNKyDeth]

Are you using two power adapters or are you using the power adapter cable that goes from the CD-Rom 2 to the PCE and only using one power brick?

[atman]

Are you using two power adapters or are you using the power adapter cable that goes from the CD-Rom 2 to the PCE and only using one power brick?

Im only using one powerbrick, I dont think its possible to use more. One in the IFU. The power connections are blocked by the IFU so there is not possible?
The Super CDROM2 have a separate plug i think?

[MNKyDeth]

I didn't realize, I thought you meant the Super CD-Rom 2 pictured below.
https://commons.wikimedia.org/wiki/File:PCEngine_FirstModel_with_SuperCDRom2.jpg

I knew you were using the IFU but thought you swapped it out for the above. I am however not familiar with the IFU in any way as I have not worked on one. Sorry.

[atman]

I have managed to get some readings from the 30-port connector.

Found out that 21, 22, 30 are ground and 5V are pin 20,27.

Checked the CDROM-unit and it looked right.

But it makes no sense on the IFU-side of the connector. Like an entire row (lower) are +5v, and the ones that is supposed to be +5v are like 8v.

Something is off with the IFU.

Before i brought the working CDROM a non-working was included in the setup. And when I tested it the diode on the IFU did not ever lid up. When I removed the faulty CDROM it the IFU led lit up again.

Some sort of short in the junk CD that made the IFU break is my guess.

Changed the 7805 to an 1.5A, checked all caps for short but it seems fine.
Anyone have a suggestion what have happen with the IFU? Where to look next?
As mentioned before, the console part of the IFU works well.

[Keith Courage]

Unfortunately I've seen this problem happened both ways. Meaning the problem could be the CD drive or the problem could be the ifu. It's too bad you don't have a spare of one or the other to be able to test to find out which one is the actual problem.

If you don't know anyone that lives closer to you I'd be willing to test the CD drive for you if you want to mail it out. That way you could at least narrow down if the problem is the CD drive or the docking station. I am in the Chicago area.

[atman]

I have a spare CD, but I belive that one could damaged the IFU. Brought a confirmed working CD. The IFU can have damaged the working CD aswell... I decided to buy another IFU cause they are cheaper and it quite easy to find a working tested one..

I live in the Sweden area so its quite hard to find a test rig. Thanks for the advice. Ill get back in this matter..


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[Fidde_se]

Does the CD-ROM2 power on when in the IFU?

The PCE part and the CD part have different power regulators, So hucards can load up great while the CD doesn't even lit up.

In that case IC118 comes to mind, then there's another one that's has resistor controlled voltage output http://www.retrosampling.se/Temp/IFU-30/IFU-30%20Main%20Board%20PCB.jpg

[atman]

Thanks for the info.

The CD is dead in the IFU, but works standalone so to speak.

IC118 is the voltage regulator that I changed for a 1.5A. You said that they get power from different regulators. IC118 controls the CD part or is it the resistor regulator?

Have any idea where the resistor regulator is located?




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[Fidde_se]

TR101 was the regulator for CD part, right behind the 7805 that has the heatsink on it.

http://www.retrosampling.se/Temp/IFU-30/IFU-30%20Components.txt

[atman]

Aha, the transistor without the heatsink, will make a check what that outputs..


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[atman]

Aha, the transistor without the heatsink, will make a check what that outputs..


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[Fidde_se]

This is since the CD-ROM2 is standalone and works on PC8801 and has its own 7805 regulator therefor it's getting higher voltage separated from the rest of the IFU.

Never measured TR101 but I guess it's goes directly to the power input and delivers 9-10v to the CD-ROM2 connector, nearly acting like a surge protection from the incoming power on the IFU towards the CD part.

[atman]

Think one pin on the cdrom interface. had like 8.5v when I checked yesterday. Dunno what the 7805 inside the CD is rated for correct input.
Tried 10V 2A input and 12V 3A in the interface with no luck..


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[Fidde_se]

Both of those voltages should have worked.

It doesn't need any of the data lines to work standalone in the IFU, so it's either not getting power or ground, we should note that there is a few components in the CD-ROM2 also, it's like a diod, since it's comes from both the DC socket and the CD connector, and it goes into one just being separated with a diod, maybe something more, wolfman on the forum had some trouble with that 2-3 years ago and we checked everything around that back then. So it might work with the DC power but not the the CD connector.....