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11
TG/PCE Repair/Mod Discussion / Re: Duo RX loud scratching sound when CD spins
« Last post by opticalnoise on March 24, 2024, 02:30:35 PM »
Is this something that can be adjusted? I was given this link and after reading it I'm concerned that I would just end up damaging the system. The thread is also about the standalone CDROM2 unit for the briefcase so I don't know how much it is applicable to the Duo RX units.

https://www.pcenginefans.com/forum/index.php?topic=22884.0
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Here are all of the connections underneath the card reader that are often damaged by capacitors leaking

Card connector:

Pin 1 - Pin 40 IC501
Pin 2 -
Pin 3 - Pin 65 IC901 + Pin 4 IC501
Pin 4 - Pin 68 IC901 + Pin 2 IC518
Pin 5 - Pin 69 IC901 + Pin 11 IC517
Pin 6 - Pin 2 IC506 + Pin 72 IC901 + Pin 8 IC517
Pin 7 - Pin 3 IC506 + Pin 79 IC901 + Pin 11 IC516
Pin 8 -  Pin 4 IC506 + Pin 80 IC901 + Pin 8 IC516
Pin 9 - Pin 5 IC506 + Pin 1 IC901 + Pin 13 IC516
Pin 10 - Pin 6 IC506 + Pin 2 IC901 + Pin 6 IC516
Pin 11 - Pin 7 IC506 + Pin 3 IC901 + Pin 15 IC516
Pin 12 - Pin 8 IC506 + Pin 4 IC901 + Pin 4 IC516
Pin 13 - Pin 9 IC506 + Pin 5 IC901 + Pin 17 IC516
Pin 14 -  Pin 10 IC506 + Pin 6 IC901 + Pin 2 IC516
Pin 15 - Pin 11 IC506 + Pin 21 IC902 + Pin 12 IC903 + Pin 49 IC901 + Pin 9 IC520
Pin 16 - Pin 12 IC506 + Pin 20 IC902 + Pin 11 IC903 + Pin 50 IC901 + Pin 8 IC520
Pin 17 - Pin 13 IC506 + Pin 19 IC902 + Pin 10 IC903 + Pin 51 IC901 + Pin 7 IC520
Pin 18 - GND
Pin 19 - Pin 15 IC506 + Pin 17 IC902 + Pin 9 IC903 + Pin 52 IC901 + Pin 6 IC520
Pin 20 - Pin 16 IC506 + Pin 16 IC902 + Pin 8 IC903 + Pin 53 IC901 + Pin 5 IC520
Pin 21 - Pin 17 IC506 + Pin 15 IC902 + Pin 7 IC903 + Pin 54 IC901 + Pin 4 IC520
Pin 22 - Pin 18 IC506 + Pin 14 IC902 + Pin 6 IC903 + Pin 55 IC901 + Pin 3 IC520
Pin 23 - Pin 19 IC506 + Pin 13 IC902 + Pin 5 IC903 + Pin 56 IC901 + Pin 2 IC520
Pin 24 - Pin 3 IC501 + Pin 64 IC901
Pin 25 - Pin 21 IC506 + Pin 74 IC901 + Pin 11 IC517
Pin 26 - Pin 22 IC506 + Pin 3 IC902 + Pin 78 IC903 + Pin 62 IC901 + Pin 24 IC515 + Pin 4 IC519
Pin 27 - Pin 23 IC506 + Pin 73 IC901 + Pin 6 IC517
Pin 28 - Pin 24 IC506 + Pin 77 IC901 + Pin 15 IC517
Pin 29 - Pin 25 IC506 + Pin 78 IC901 + Pin 4 IC517
Pin 30 - Pin 71 IC901 + Pin 17 IC517
Pin 31 - Pin 70 IC901 + Pin 2 IC517
Pin 32 - Pin 67 IC901 + Pin 4 IC518
Pin 33 - Pin 66 IC901 + Pin 6 IC518
Pin 34 - Pin 27 IC506 + Pin 2 IC902 + Pin 77 IC903 + Pin 63 IC901 + Pin 1 IC519
Pin 35 - Pin 14 IC901
Pin 36 - Pin 11 IC901 + Pin 24 IC902
Pin 37 - Pin 2 IC501 + Pin 43 IC901
Pin 38 - Vcc

Additional connections with traces underneath cart connector:

OSC - C944 Pad 2 + J101 + C945 Pad 2
Audio L - Pin 17 IC901
Audio R - Pin 18 IC901
CE7 - Pin 1 IC902 + Pin 60 IC901
RDY - Pin 1 R905 + Pin 12 IC901 + Pin 78 IC902
IRQ+PUP - Pin 1 R903 + Pin 44 IC901 + Pin 77 IC902

MA6-14 and MD12-15 are also underneath the cart connector right on the edge of the outline. These are graphics related and are between the GPU and RAM
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TG/PCE Repair/Mod Discussion / Composite interference? White PCE in briefcase
« Last post by opticalnoise on March 23, 2024, 12:55:50 PM »
I have a white PCE that is showing horizontal flowing interference lines. The system is unmodded and came to me in pretty bad, smelly shape. It originally ran fine when I first tested it (played about an hour of Gunhed), but after I discovered the controller port on the PC Engine was extremely sticky I cleaned it out with a tooth brush and Isopropyl 99%. After doing that, the controller port is fine but these interference lines suddenly appeared. I opened up the console thinking I broke something with my controller port cleaning but the board looks fine.

I cleaned the PCB carefuly with ISO 99% and Q-tips and got quite a bit of brown residue but no obvious signs of damage, no visibly bad caps, etc. The only thing I haven't done is open up the IFU itself.

I've tried a few different games and cables but they all have this interference pattern. Sadly I lack the tools to test if its the IFU or the PCE as I don't have any video or power cables for the PCE itself. Screen is my dedicated gaming CRT TV that doesn't have issues with other composite consoles. No other connectors, splitters, or anything else is between the console and the TV composite input.

Below is the interference I'm seeing:
https://www.youtube.com/watch?v=LqWof-98dDI

Thanks everyone!
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TG/PCE Repair/Mod Discussion / Re: Duo RX loud scratching sound when CD spins
« Last post by xodaraP on March 23, 2024, 02:43:09 AM »
Most likely the laser pickup has dropped down and the noise you are hearing is the spindle rubbing on the housing (and potentially your disc)

There are clips that hold down the housing that can break and cause it to lift, or something may be trapped between the pickup and the housing pushing it down
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TG/PCE Repair/Mod Discussion / Re: Duo RX loud scratching sound when CD spins
« Last post by opticalnoise on March 22, 2024, 11:32:30 PM »
CD mechanism on my desk spinning without noise:
https://www.youtube.com/watch?v=UpH5_YeJ3ls

With the mechanism in the case and spinning noisily:
https://www.youtube.com/watch?v=VSpIaDCa8KA

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TG/PCE Repair/Mod Discussion / Duo RX loud scratching sound when CD spins
« Last post by opticalnoise on March 22, 2024, 11:21:22 PM »
When I try to put any type of CD into my Duo RX, the console can read it but I hear a loud plastic-on-plastic scratching sound. When I lift the CD mechanism out of the console and let it sit on my desk while still connected to the console, it spins silently and is essentially working perfectly. I've verified the disc and all the moving parts of the disc-reading component aren't touching anything. There are no loose wires, no capacitors or any other component that could potentially touch it, make it unbalanced or uneven, and so on.

I posted about this in a Facebook group and the suggestions were something was touching it like a bent capacitor or that the mechanism wasn't sitting correctly. I've reseated the mechanism a few times, ensuring that the foam-rubberish stands are all touching and centered on the three posts coming out of the main board. I've tried pressing gently on different corners of the drive while the disc spins to see if maybe its off-center while the case is off but this seems to only intensify the scratching noise. I also tried adjusting the 3 controls on the board, VR102 and such, all to no avail.

The only suggestion I haven't tried yet (as it sounds like it has a high possibility of causing damage) is adjusting the CD spindle height by physically pulling it upwards.

This is one of those cases where this was a device that worked for years, sat in a closet for a while, and now doesn't work. Any thoughts on how I can address this would be appreciated. I'm new to this forum so I will try to post a link to videos of what I'm seeing and hearing after this post goes up. Thanks everyone.
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Here are the connection points for the CXD1167Q - any that I haven't listed a component pin are going to vias and then to passives on the opposite side of the board and I haven't made note of component numbers

Pin 1
Pin 2 - Pin 35 IC102
Pin 3 - Pin 34 IC102
Pin 4
Pin 5
Pin 6
Pin 7 - Pin 33 IC102
Pin 8
Pin 9
Pin 10 - GND
Pin 11
Pin 12 - GND
Pin 13 - Pin 25 IC102 + Pin 15 IC104
Pin 14 - Pin 24 IC102
Pin 15 - Pin 19 IC104 + Pin 23 IC102
Pin 16 - Pin 2 IC104 + Via
Pin 17 - Pin 20 IC102
Pin 18 - Pin 16 IC104 + Pin 18 IC102
Pin 19 - Pin 11 IC104 + Through hole 8 P404
Pin 20 - Pin 62 IC104 + Through hole 4 P404
Pin 21 - Pin 105 IC501 + RA502 Pin 4
Pin 22
Pin 23 - Pin 12 IC104
Pin 24 - Pin 20 IC104 + Pin 110 IC501
Pin 25 - Pin 13 IC104
Pin 26 - Vcc
Pin 27 - NC
Pin 28 - Pin 1 Q102 + Through hole 3 P404
Pin 29 - GND
Pin 30 - GND
Pin 31 - GND
Pin 32 - GND
Pin 33 - Vcc
Pin 34 - GND
Pin 35 - GND
Pin 36 - GND
Pin 37 - GND
Pin 38 - GND
Pin 39 - GND
Pin 40 - GND
Pin 41 - GND
Pin 42 - GND
Pin 43 - GND
Pin 44 - GND
Pin 45 - GND
Pin 46 - GND
Pin 47 - GND
Pin 48 - GND
Pin 49 - GND
Pin 50 - GND
Pin 51 - NC
Pin 52 - GND
Pin 53
Pin 54 - Pin 2 X101
Pin 55 - Vcc
Pin 56 - Pin 57 IC103 + Pin 59 IC103 + Pin 3 IC104
Pin 57
Pin 58 - GND
Pin 59
Pin 60 - NC
Pin 61 - NC
Pin 62 - NC
Pin 63 - NC
Pin 64 - NC
Pin 65 - NC
Pin 66 - Through hole 5 P404
Pin 67 - NC
Pin 68 - NC
Pin 69
Pin 70
Pin 71 - NC
Pin 72 - Through hole 7 P404
Pin 73 - Vcc
Pin 74 - NC
Pin 75 - NC
Pin 76
Pin 77
Pin 78
Pin 79
Pin 80

And connections for the uPD78C14

Pin 1 - NC
Pin 2 - Pin 16 IC103 + Via
Pin 3 - Pin 56 + Pin 57 + Pin 59 IC103 + Via
Pin 4 -
Pin 5 - NC
Pin 6 - Pin 24 IC102 + Pin 14 IC103
Pin 7 -
Pin 8 - Pin 2 P7 + Pin 1 D102
Pin 9 - P402 Pin 3
Pin 10 -
Pin 11 - Pin 19 IC103 + P404 Pin 8
Pin 12 - Pin 23 IC103
Pin 13 - Pin 25 IC103
Pin 14 - Pin 1 Q105
Pin 15 - Pin 25 IC102 + Pin 13 IC103
Pin 16 - Pin 18 IC102 + Pin 18 IC103
Pin 19 - Pin 15 IC103 + Pin 23 IC102
Pin 18 - Pin 41 IC102 + Pin 28 IC101
Pin 17 - Pin 113 IC501
Pin 20 - Pin 24 IC103 + Pin 110 IC501
Pin 21 -
Pin 22 - Pin 1 P402 + Pin 49 + Pin 99 IC105 + Via
Pin 23 - GND
Pin 24 -
Pin 25 -
Pin 26 - GND
Pin 27 - GND
Pin 28 - NC
Pin 29 - NC
Pin 30 - NC
Pin 31 - NC
Pin 32 - Pin 9 P402
Pin 33 -
Pin 34 - Pin 7 P402
Pin 35 - Pin 3 P4 + Pin 6 P402
Pin 36 - Vcc
Pin 37 - Vcc
Pin 38 - Pin 20 IC105
Pin 39 - Pin 5 P402 + Pin 19 IC105
Pin 40 - Pin 18 IC105
Pin 41 - Pin 17 IC105
Pin 42 - Pin 16 IC105
Pin 43 - Pin 15 IC105
Pin 44 - Pin 14 IC105
Pin 45 - Pin 13 IC105
Pin 46 - Pin 12 IC105
Pin 47 - NC
Pin 48 - NC
Pin 49 -
Pin 50 -
Pin 51 -
Pin 52 -
Pin 53 -
Pin 54 -
Pin 55 -
Pin 56 -
Pin 57 - Vcc
Pin 58 - Vcc
Pin 59 - Pin 94 IC105
Pin 60 -  Pin 95 IC105
Pin 61 - Pin 96 IC105
Pin 62 - Pin 20 IC103 + Pin 4 P404
Pin 63 - Pin 2 LED
Pin 64 - Vcc
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TG/PCE Repair/Mod Discussion / Re: Super Cdrom2 RGB mod
« Last post by delucep on March 22, 2024, 11:57:23 AM »
Thanks both!  The picture looks a bit dark to me, all the colours are correct but the brightness/contrast looks "wrong", if that makes sense - any suggestions? Thanks again!
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Console Chat / Re: Your Daily Dose of Gaming.
« Last post by roflmao on March 20, 2024, 10:53:05 PM »
Lately I've been sucked into Castlevania:SotN again. I'm playing the PS1 version on my Miyoo Mini Plus and am getting close to finishing the inverted castle. Man I had forgotten how much harder the inverted castle is compared to the OG castle. This game is so much fun.
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Console Chat / Re: Your Daily Dose of Gaming.
« Last post by lukester 3.0 on March 20, 2024, 11:52:48 AM »
been getting around to finishing more genesis games i only tried in the past. lately been

>Elemental Master on 1 life (sick soundtrack, pretty cool super weapons)
>Dangerous Seed (its super easy but spikes at the end, took a couple credits on the last guy. never been a big fan of this one though, i love the art style but i'll take galaga 88 any day in the gameplay department, it's just kind of eh. my favorite genesis namco game is either marvel land or rolling thunder 2)
>Snow Bros (now that i kinda get the mechanics and enemy patterns i wonder how far i could get with less continues lol. such creepy as hell enemy designs! the 2 new stages are nice but definitely very out of place visually)

i need to get back to new zealand story eventually. beat the pce version and im not the biggest fan of either port, but i do love some good arrows and balloon action

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