MCU pin 30/PE1/Gate is only outputting 0v whether i have it in random or in keyboard mode and press keys. Any suggestions as to how to track down what is causing this?
According to the schematic Gate is connected directly to R146 (22kohm). I measured the voltage drop across R146 and it is 0v, however I measured it's resistance and get 46kohm... The voltage on either side of it is 3.05vDC with respect to ground. This doesn't change if I turn the resonance or any other pot.
MCU not outputting gate
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MCU not outputting gate
Last edited by djarago on Tue Nov 08, 2005 7:17 pm, edited 1 time in total.
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I was holding the probe of the meter directly on the pin of the MCU (above the socket) right where it connects to the package.
The leds and such seem to work. The usb chip worked (before I had it connected to the main board). I haven't tried loading new firmware.
With the MCU removed pin 30 appears to have about 32kohm resistance to ground.
The leds and such seem to work. The usb chip worked (before I had it connected to the main board). I haven't tried loading new firmware.
With the MCU removed pin 30 appears to have about 32kohm resistance to ground.
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The LEDs light when I press a button (but the # keys do not light unless im holding down chain or something like that). In random mode they dont flash, only change when I press a key. The only LED that flashes is tempo and it changes speed when i turn the tempo enc.
The MCU and EEProm both have 5.07vDC across their respective VCC and GND lines.
I'm going to try to reload the firmware now.
The MCU and EEProm both have 5.07vDC across their respective VCC and GND lines.
I'm going to try to reload the firmware now.
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- Posts: 62
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Looks like I can't upgrade the firmware as javacomm from sun is not available for windows and the new control software only lists comm ports 1 through 4 and my usb serial port is showing up as 6. If i go into advanced settings and try to change it I'm told comm 3 and 4 (and 5) are in use even though they do not show up in device manager. I may be able to fix this though.
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- Posts: 62
- Joined: Sun Jul 10, 2005 1:45 am
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- Posts: 62
- Joined: Sun Jul 10, 2005 1:45 am
Well the reason I can't get the java to work is because sun doesn't have a javacomm download for windows on the javacomm download page. So either they don't have it anymore or I'm just not seeing it.
I tried running the java software (without downloading javacomm), but it had no place to choose a comm port (im guessing because of my lacking javacomm). When I clicked 'program' it seemed to do nothing at all.
I just checked every pin on the MCU and EEProm. None of them are shorted to ground (aside from pin 20 on the MCU and pin 4 on the eeprom).
extra checking:
pins 3, 7, and 8 on eeprom are shorted to VCC and pin 40 on mcu is shorted to VCC as well.
what I find odd is that when I was trying to trace the gate signal along I found that R146 has no voltage drop, which means there's no current flowing through it, but I couldn't figure out why... actually I just had an idea, but it will have to wait until morning for me to test.
I tried running the java software (without downloading javacomm), but it had no place to choose a comm port (im guessing because of my lacking javacomm). When I clicked 'program' it seemed to do nothing at all.
I just checked every pin on the MCU and EEProm. None of them are shorted to ground (aside from pin 20 on the MCU and pin 4 on the eeprom).
extra checking:
pins 3, 7, and 8 on eeprom are shorted to VCC and pin 40 on mcu is shorted to VCC as well.
what I find odd is that when I was trying to trace the gate signal along I found that R146 has no voltage drop, which means there's no current flowing through it, but I couldn't figure out why... actually I just had an idea, but it will have to wait until morning for me to test.
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Merry Christmas. I found it on my drive. http://wiki.jonnay.net/_media/x0x/javacomm20-win32.zip
Please be positive and constructive with your questions and comments.