Special thanks to Keith Courage for supplying the missing SMD cap! I removed it from the donor board and tested it at 53nF. (In the very unlikely event someone is missing the same cap or would like to know the value) Missing cap replaced and everything is in great working order!
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@GTV reviews the Cosmic Fantasy 1-2 Switch collection by Edia, provides examples of the poor English editing/localization work. It's much worse for CF1. Rated "D" for disappointment, finding that TurboGrafx CF2 is better & while CF1's the real draw, Edia screwed it up... |
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#2
Console Repair/Mod Center / Re: CD-ROM2 missing cap at (C158)
08/03/2017, 07:51 PM
PM sent, thank you!
#3
Console Repair/Mod Center / Re: CD-ROM2 missing cap at (C158)
08/02/2017, 12:18 PM
Good to know! I'll put back the transistor at least, happy to know those are original additions. My laser is reading beautifully thanks to a scope and some dialing, so I'll probably leave off the yellow cap across the tracking gain pot. As far as the caps go, I did already replace all the electrolytic caps, it's tedious but personally didn't find it too bad, mileage may vary of course. Anyway about that missing SMD cap (C158), if you're still willing to send it along that would be great, I'd be happy to put it on the capacitance tester and post so the information gets out there (in the unlikely event someone else is missing this cap, too bad there are no schematics...one component at a time will get us there eventually i suppose)
#4
Console Repair/Mod Center / Re: CD-ROM2 missing cap at (C158)
08/01/2017, 07:45 PM
Keith Courage- that's mighty nice of you! Would you be willing to part with the whole board (I'd be willing to pay you for it). Reason I ask is that this one has some oddities, maybe these components are stock or are part of some repair, I've not seen enough of these to know. I've been meaning to start another thread asking but here goes:
Do these look Factory or are these part of someone's "mod/repair" ???? Doesn't look "factory" to me and viewing online images, I never see these components. I've even tried removing all of them and found the drive still functions fine with everything I've thrown at it...more of a curiousity at this point.
Mounted transistor with diode, both outer legs connect to the 5v supply, the inside leg goes to that trace that leads to a via and ends on the NEC D9309GF chip (can't recall the exact pin but there's no data sheet for the chip that I could find.)
and the cap across VR103 pot....
Do these look Factory or are these part of someone's "mod/repair" ???? Doesn't look "factory" to me and viewing online images, I never see these components. I've even tried removing all of them and found the drive still functions fine with everything I've thrown at it...more of a curiousity at this point.
Mounted transistor with diode, both outer legs connect to the 5v supply, the inside leg goes to that trace that leads to a via and ends on the NEC D9309GF chip (can't recall the exact pin but there's no data sheet for the chip that I could find.)
and the cap across VR103 pot....
#5
Console Repair/Mod Center / Re: CD-ROM2 missing cap at (C158)
07/29/2017, 01:32 PM
Yes it's a surface mount one. This isn't the best image, but it's what I have at the moment. You can see something was in that space and broke loose at some point.
As an update to the audio, I did manage to fix the drops and everything else seems to be working fine now despite the missing cap. It would be nice to replace it anyway though. This drive got a good once over, complete cap replacement (not including the SMD ones obviously), pot adjustment and gear/rail cleaning, overall cleaning, middle gear inspection etc. (The image below is prior to any work) the audio drops ended up being a mechanical issue with the worm gear and laser rail. (Which was previously cleaned and re-greased but running out of other ideas I did it again as well as turned the rail around.)
As an update to the audio, I did manage to fix the drops and everything else seems to be working fine now despite the missing cap. It would be nice to replace it anyway though. This drive got a good once over, complete cap replacement (not including the SMD ones obviously), pot adjustment and gear/rail cleaning, overall cleaning, middle gear inspection etc. (The image below is prior to any work) the audio drops ended up being a mechanical issue with the worm gear and laser rail. (Which was previously cleaned and re-greased but running out of other ideas I did it again as well as turned the rail around.)
#6
Console Repair/Mod Center / CD-ROM2 missing cap at (C158)
07/25/2017, 05:05 PM
I have been working on a CD-ROM2 unit and discovered a missing component at C158. I've looked around for documentation that would help me identify what to replace it with but so far have turned up nothing.
One of the C158 pads is ground the other connects to pin 33 of the NEC D78C14GF which appears to be "AN5" according to the data sheet.
Any ideas what component should be there?
I've been fighting random audio dropouts with this board and wondering if it's related to this missing cap/component.
Thanks!
One of the C158 pads is ground the other connects to pin 33 of the NEC D78C14GF which appears to be "AN5" according to the data sheet.
Any ideas what component should be there?
I've been fighting random audio dropouts with this board and wondering if it's related to this missing cap/component.
Thanks!
#7
Console Repair/Mod Center / Re: Vertical lines (noise) mostly in green.
10/25/2016, 08:16 PM
When you say PCE ground shield, you're referring to the soldered on tin/aluminum that coveres the entire bottom of the PCE PCB? Lol
If so, my PCE does have that and I resoldered it after doing Tim's jailbar fix.
However, as I mentioned above, my Interface Unit IS missing the shielding which should line the bottom. You can see it in it's proper home in this image:
It looks like there are several areas that connect to this missing shielding...
Think the digital ground should not have that interference in it to begin with? Im sure the lack of IFU shielding isn't helping overall...I'd have to find a suitable replacement for it...least it looks great now anyway
BTW- I ultimately did leave out the audio from my SCART cable since it introduced a bit of noise again when re adding it. I tried it two ways, one directly off the IFU and from the IFU to the AV Driver first. The AV Driver made it less noisy but it still wasn't ideal. It's easy enough to just connect the RCA jacks.
If so, my PCE does have that and I resoldered it after doing Tim's jailbar fix.
However, as I mentioned above, my Interface Unit IS missing the shielding which should line the bottom. You can see it in it's proper home in this image:
It looks like there are several areas that connect to this missing shielding...
Think the digital ground should not have that interference in it to begin with? Im sure the lack of IFU shielding isn't helping overall...I'd have to find a suitable replacement for it...least it looks great now anyway
BTW- I ultimately did leave out the audio from my SCART cable since it introduced a bit of noise again when re adding it. I tried it two ways, one directly off the IFU and from the IFU to the AV Driver first. The AV Driver made it less noisy but it still wasn't ideal. It's easy enough to just connect the RCA jacks.
#8
Console Repair/Mod Center / Vertical lines (noise) mostly in green. Solved- My AV Driver likes GRDa!
10/24/2016, 11:17 PM
Mickcris- Thanks for the feedback and the reference link... My issue is solved! Looking at a pinout of the ext connector the PCE has a GRDa (Analog) and GRDd (Digital). I moved power and ground over to different pins identified by RGB32E in the linked thread. I moved to pin A2 for power (this could have probably stayed where it was) and A21 for (analog) ground.
I remember reading about the grounds somewhere but the thread refreshed my memory. Before I tried this I tried power/ground from the IC and it made things much worse, reinforcing my suspicion of grounding issues. Not sure all the differences in the two grounds and/or if the AV Driver is more susceptible but I would suggest anyone with noise in there video lines try the GRDa connection.
Thanks again
I remember reading about the grounds somewhere but the thread refreshed my memory. Before I tried this I tried power/ground from the IC and it made things much worse, reinforcing my suspicion of grounding issues. Not sure all the differences in the two grounds and/or if the AV Driver is more susceptible but I would suggest anyone with noise in there video lines try the GRDa connection.
Thanks again
#9
Console Repair/Mod Center / Re: Vertical lines (noise) mostly in green.
10/24/2016, 08:02 PM
I just tried moving my sync line from the sync connection (C22) over to composite (A22). Result was the lines were still visible and an overall uglier/wavey image. 240p test suite wouldn't launch after doing this for some reason (games worked however).
Unless I'm impatient I'll hold off trying the mod on the PCE directly until the power supply arrives, hopefully it won't come to that, but it's an option.
Few other things I thought may help.
I'm currently pulling power and ground off the ext connector (C21 and C20) for the AV Driver. Is there a better suggestion for 5v/ground within the IFU?
I'm not running 5v to the SCART cable since I don't need it to enable my display. I can't imagine this would resolve my issue but I thought I'd mention it.
Unless I'm impatient I'll hold off trying the mod on the PCE directly until the power supply arrives, hopefully it won't come to that, but it's an option.
Few other things I thought may help.
I'm currently pulling power and ground off the ext connector (C21 and C20) for the AV Driver. Is there a better suggestion for 5v/ground within the IFU?
I'm not running 5v to the SCART cable since I don't need it to enable my display. I can't imagine this would resolve my issue but I thought I'd mention it.
#10
Console Repair/Mod Center / Re: Vertical lines (noise) mostly in green.
10/24/2016, 06:41 PM
I'm using the 8 pin din. The brown wire is running from the housing ground point to the SCART ground pin (pin 2) which runs on the black wire to the AV Driver's ground plane.
#11
Console Repair/Mod Center / Re: Vertical lines (noise) mostly in green.
10/24/2016, 06:22 PM
Links to images:
#12
Console Repair/Mod Center / Re: Vertical lines (noise) mostly in green.
10/24/2016, 05:38 PM
I've read a bunch of other posts and I've ordered a new power supply for the IFU which was suggested by mickcris. The interference is not snow like or wavey lines but more jailbar looking. However it's not the same as the jailbar images I've seen in other threads. These are very noticeable, fixed, thick bars which are evenly spaced roughly every 10 pixels or so.
I'm hoping it's the power supply but can't help but think grounding could be the cause since I can clean them up greatly by connecting green directly to the SCART pin 11 just before the framemeister. Has anyone had grounding issues with this setup before? Am I missing something simple somewhere? Also, I noticed a YouTube video with an open IFU and noticed a tin/aluminum shielding under the IFU. Mine is missing this barrier completely...
Appreciate any advise.
I'm hoping it's the power supply but can't help but think grounding could be the cause since I can clean them up greatly by connecting green directly to the SCART pin 11 just before the framemeister. Has anyone had grounding issues with this setup before? Am I missing something simple somewhere? Also, I noticed a YouTube video with an open IFU and noticed a tin/aluminum shielding under the IFU. Mine is missing this barrier completely...
Appreciate any advise.
#13
Console Repair/Mod Center / Vertical lines (noise) mostly in green.
10/24/2016, 12:24 AM
Hello everyone,
I'm not new to modding but new to PCE. Thanks to the help of these forums, Viletim (and google) I've pieced my way through a RGB mod to a IFU-30. Everything works minus a small issue... hopefully someone can point me in the right direction..
I'm getting strange vertical lines (noise) mostly on the green signal but a little in the red and blue lines too. It appears to be related to grounding. I tried connecting green directly to the SCART head and it gets WAY cleaner. But I can't really leave it that way ;). If I try grounding the SCART cable to different spots on the IFU it gets more/less noise depending on where I connect. Least noise is when grounding to the AV Driver which is where I grounded originally.
I've tried two different SCART cables and they both experiance the same issue but work fine on a duo-r that I have so I know the cables are good. Also, I have removed the audio lines from the SCART line to rule it out but no luck there. BTW I'm using the sync line next to blue on the ext connector.
Here's a breakdown of my setup:
Pc Engine (White case)
IFU-30
CD-ROM2
AV Driver (installed in IFU off ext connector)
Completed Tims jailbar fix with the included caps.
Connected to framemeister via SCART.
Any ideas or suggestions?
I'm not new to modding but new to PCE. Thanks to the help of these forums, Viletim (and google) I've pieced my way through a RGB mod to a IFU-30. Everything works minus a small issue... hopefully someone can point me in the right direction..
I'm getting strange vertical lines (noise) mostly on the green signal but a little in the red and blue lines too. It appears to be related to grounding. I tried connecting green directly to the SCART head and it gets WAY cleaner. But I can't really leave it that way ;). If I try grounding the SCART cable to different spots on the IFU it gets more/less noise depending on where I connect. Least noise is when grounding to the AV Driver which is where I grounded originally.
I've tried two different SCART cables and they both experiance the same issue but work fine on a duo-r that I have so I know the cables are good. Also, I have removed the audio lines from the SCART line to rule it out but no luck there. BTW I'm using the sync line next to blue on the ext connector.
Here's a breakdown of my setup:
Pc Engine (White case)
IFU-30
CD-ROM2
AV Driver (installed in IFU off ext connector)
Completed Tims jailbar fix with the included caps.
Connected to framemeister via SCART.
Any ideas or suggestions?
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