epson q703b-ga conversion


30 Oct 2019, 17:57

first off, there are already two excellent workshop-threads on a very close relative of my precious qx10-"KEY BOARD UNIT" (by snacksthecat, viewtopic.php?f=7&t=21075 and sangdrax viewtopic.php?f=7&t=21416). also there is triplehaata's slightly more complex conversion ( ... 388807755/) which amazingly keeps the pcb intact (but needs external power).

the q703c-aa looks quite like my g703b-ga, but it's layout is slightly different:
IMG_1201.JPG (1.29 MiB) Viewed 1671 times
IMG_1207.JPG (1.52 MiB) Viewed 1671 times
IMG_1203.JPG (1.81 MiB) Viewed 1671 times
IMG_1200.JPG (1.56 MiB) Viewed 1671 times
now i've had this beauty for quite some time, but seeing how you guys successfully converted yours, i'd love to do the same.
but before i heat up my soldering iron, i want to make sure that i'm as prepared as possible..

so basically, i have to
- desolder all the pcb components (or just the voltage regulator, resistor and cap like in snack's post?)
- cut the traces between the lower two switch pins (why are there 4 of them?)
- form new rows by soldering diodes to one of the two pins (which one do i pick?)
- grab the end of each row and column and connect it to the teensy/promicro
- add resistors for the leds?
- break out the cigars and champagne

i'm afraid of touching it :o
i'd appreciate any advice before i go in..!

Post Reply

Return to “Workshop”