Pennanhuo

I did that and noticed nothing wrong. I also checked R6 and R10. Without the pic pin 20 reads 5.06 and with the pic 1.74. And board is still not sending anything.

I'll try to clarify myself. I did these measurings described in core page as "Apply power to the module after all parts except the PIC and the optocoupler are mounted. Check the voltage levels between the most important pins with a multimeter (analog or digital doesn't matter) before plugging the PIC and the 6N138 into the socket: IC1:MCLR(1) - IC1:Vss(12) = 5V IC1:Vdd(11) - IC1:Vss(12) = 5V IC1:Vdd(32) - IC1:Vss(31) = 5V IC2(8 ) - IC2:(5) = 5V" were all at 0.03-0.14 above the 5v, which I thought was OK. So I inserted the chips and tested the board. When it didn't work I did the tests described in the two pictures that I linked to in my previous post. To me it seemed that in the picture the chip's are connected, since it's the chip in the picture and not the socket. So I did measurings with them both inserted. So did I intreped the pictures wrong? Do you need to know something more? This is quite frustrating for me too :S

I switched to a regular 11v 500ma transformer. I did the iniatial voltage check and it was ok. Then I plugged in the pic and the octocoupler and it still wouldn't send the upload request. Testing according to this http://www.ucapps.de/howtodebug/mbhp_core_extract_measuring_vdd.gif I got these readings. From pic Pin 1=5.06 11=5.06 20=1.64 32=5.06 26=1.88 25=0.08(Does this mean that it's sending something but it isn't getting trough?) octocoupler pin 8 5.06 Midi out 5.06 J1 vd 5.06 And testing with this http://www.ucapps.de/howtodebug/mbhp_core_extract_measuring_gnd.gif From pic Pin 12=5.04 14=3.77 31=5.01 octocoupler pin 5 5.03 ic3 pin 2 5.05 I checked my soldering as best as I could and to me every part seems to be correctly placed. Can you see what I missed?

It seems that the problem was the old c64 psu. I think it just gave up at some point. I tried with my mobile phone charger :D, got a bit more power out of the pins (around 4v) now i just need to find a new supply :( Sorry if my writing is a bit incoherent, since I'm a beginner with electronics and don't know all the terms and stuff.

pic pin 1 - 12 1.90v pin 11-12 1.89v pin 32-31 1.89v Ic2 pin 8 - 5 1.90v These were somewhere around 5v when I tested the core right after finishing it. After that I brought it home from work and now it measures as above. Can you tell me what's wrong?

I'll get some more accurate readings from the board today when I get home.

First with this http://www.ucapps.de/mbhp/mbhp_sid_c64_psu.pdf and then later also tried connecting straight to the 5.someting volt pins on the psu. And I did the ungplugged tests too and even with the sid (board not the chip) connected and they were ok. And thats what's bugging me since I'm not sure if some of the ICs are broken.

I can get the "upload request" or sing of life via midi. When i tested voltages shown in http://www.ucapps.de/howtodebug/mbhp_core_extract_measuring_vdd.gif i got 1.66 volts from most of them and litle less from some. I have an original c64 psu that works fine. And my soldersing seems to be OK. I'm not experienced enough in electronics to know whats wrong Please help :>