Archive for the ‘NEC’ Category

Jailbarfix Super Grafx

Dienstag, April 4th, 2017

not a big thing replace these 2 caps with 4,7uf/16V in SMD eg. G0805 and the jailbars are gone.

you will find them on solderside from the PC Engine Super Grafx.

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Modding PAL TurboGrafx

Freitag, September 30th, 2016

I got some rare NOS TurboGrafx in 50Hz PAL Version.

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What can we do with this kind of PC-Engine

a) Speedup and change it to 60Hz

-Exchange Osscilator X201 to 21.47727Mhz
-cut Pcz80 Pin 15
-Solder wire from Pad pin 15 to Pin 22

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b) RGB bypass for best picture

I took the RGB Signal from C154 to C156 after removing the Kerkos. The wires leads directly to the Hu6260 RGB-Out

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using the rgbbypass PCB

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yellow wire to desoldered PIN 44 from HU6260 (C-SYNC)

I am using an old “french” pinput from the 90’th. So I have to reroute some cirquits

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Desolder Din and cut GND on Partsside for make standard french Version of Din8 Cable working.

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Cut 5 Din Via circuits and wire as shown here
red audio 2 (right), white Audio 6 left, grey 5V
yellow desoldered Pin 44 from Hudson 6260 CSYNC

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c) Jailbarfix

exchange C137 and C133 to 4,7uf/16V

jailbarfixpalturbografx

 

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d) jap/eng switch

you need to switch 8 wires (15,16,17,19,20,21,22,23). I done it with two  analog switches  MC14551BCP

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internal PC Engine UWRC Receiver

Dienstag, September 6th, 2016

 

I used my IFU-30 Unit, so there was no need to remove the RF Unit. As I didn’t wanted some wires to the left or right side.

I put all needed connections to the rear side. Power, RGB-Out, Audio Out.

 

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I opened the RF-box removed the orignal switch and replaced it with UWRC switch.

ground to one side and the other side of the switch to the uwrc board

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thanks again to micro, for his great Idea how to make the UWRC plugable, by removing the filters.

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green wire uwrc controll switch, red and black to the signal led combo I created at the upper side

blue “bigger” wires to the 7805 replacement for swiching the pce off/on

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a red 5mm led and a green 5mm led dremel work and to the ventilation grid

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no more heat -> replacement of the 7805

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Great feature, you can power off and on the PC-Engine via holding select and Run for around 1sec. Ideal for users of everdrives. Hope this feature will find his place in all new internal receivers from micro ;-)

Final Pic

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UWRC PC Engine Shuttle Controller

Samstag, Juli 30th, 2016

A futuristic styled Controller for the PC-Engine Shuttle. Now its time to make it wireless.

thanks to the PCB of micro and some reposition of the led usb powersupply it works great.

I put it at the hole of the original wire and with some hotglue it works

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PC Engine Duo R/RX RGB Mod with bypass PCE-TV

Mittwoch, Juli 27th, 2016

Nothing really new, only to see how to add THS Amplifier working in a Duo R / RX.

I used Pin 44 of HU C6260 C-Sync for Sync. So you have to cut the Video Signal to the Din Connector (yellow wire).

Black wire is optional, for “more” GND

 

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For the Din Pinout I used the old French Layout born in the 90ths. With RGB added to the 3 new Pins of the Din 8.1. The rest of Pins are untouched (exeption C-Sync)

3 resistors 22 Ohm are used for make PCE-TV work to output around 0,7V. The PCB is the 1st Revision of micro. Power is taken from a Elko nearby. (orange/black=GND, orange/red=5V)

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Scart Pinout

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Jailbars removement

After checking the picture there are jailbars :-(

After replacement of two  capacitor the picture is great.

replace C909 and C923 with 4,7uf down under Hu C6260

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You final reward will be 1000 Points :-)

Wireless Rules

thanks micro

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UWRC PC-Engine Cordless Controller

Donnerstag, Juli 21st, 2016

I done some ironical way of UWRC ;-)
Here i am using 3 of the 4 Batteries for powersupply of the UWRC, because of the max. voltage of 5,5V of the UWRC Board.

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