Arcade Collecting > Merit/JVL Touchscreen
JVL Power Pad
STL_Tom:
--- Quote from: STL_Tom on January 16, 2014, 11:47:45 am ---
--- Quote from: lilshawn on January 16, 2014, 10:17:18 am ---the switching system used is very sensitive to outside influence. if a drink was indeed spilled, it will throw off the sensing circuit. (the difference between the sensor open and blocked is only a few tenths of a volt difference at only a few microamps.) also, painting the button "flaps" so they block more light when pressed helps too. they often bleed light through and around the flaps and the phototransistor picks it up still.
if you use a digital camera, you can view if the infrared LED's are indeed on, if not, check upstream for a small resistor and check if you have voltage there. you may have to take a soldering iron and reflow all the solder as sometimes surface mounted stuff get's cracked/bad solder joints.
--- End quote ---
I sent the pcb out for repair. I will dive back into it if the repairman is unsuccessful.
I appreciate the advice.
--- End quote ---
I got the PCB back for the power pad buttons and it is still not working. The lights and the joystick work but not the IR switches. I douched it with alcohol to clean it. I am not seeing evidence using my camera that the IR emitters are working.
Near as I can figure they are:
SunLED devices
Part Number: XZTNI56W-1 type: 3.0x1.0mm INFRARED EMITTING DIODES
& Part Number: XZRNI56W-1 PHOTOTRANSISTORS
Any help here with getting these? I do not have any contacts for electrical parts. :cry:
lilshawn:
test to see if you are getting voltage TO the LED before you consider changing them.
if no volts at LED move upstream to the dropper resistor.
THEN consider changing them. load up sun's website and get a datasheet for the LED. then use the data (mW wavelength etc.) to find a replacement on mouser.
likely it's going to be something like this: http://ca.mouser.com/ProductDetail/Vishay-Semiconductors/VSMB14940/?qs=sGAEpiMZZMt82OzCyDsLFE2iBIk0I6aKgBaNLMgTs90%3d
STL_Tom:
--- Quote from: lilshawn on February 11, 2014, 07:49:57 pm ---test to see if you are getting voltage TO the LED before you consider changing them.
if no volts at LED move upstream to the dropper resistor.
THEN consider changing them. load up sun's website and get a datasheet for the LED. then use the data (mW wavelength etc.) to find a replacement on mouser.
likely it's going to be something like this: http://ca.mouser.com/ProductDetail/Vishay-Semiconductors/VSMB14940/?qs=sGAEpiMZZMt82OzCyDsLFE2iBIk0I6aKgBaNLMgTs90%3d
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Thanks for the help lilshawn!
I do see voltage upstream of the photodiode. I ordered the IR smd devices from Mouser just now & we'll see how it goes when they arrive in the mail.
STL_Tom:
Well, dang. Disappointing results - new diode emitters did not resurrect the old board.
I wonder what fails on this thing? I understand all these particular pcbs die... :dunno
STL_Tom:
--- Quote from: STL_Tom on February 18, 2014, 09:02:40 pm ---Well, dang. Disappointing results - new diode emitters did not resurrect the old board.
I wonder what fails on this thing? I understand all these particular pcbs die... :dunno
--- End quote ---
I gave in and bought the $190 board from Suzo-Happ.
OUCH! But, it works.
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