Hey Guys!
I enjoyed my crack 1.0 (with 240V Bottlehead PT3) for a longer time (EVERYTHING WAS FINE) and decided to upgrade with speedball 1.1.
I assembled and installed after voltage check the small speedball circuit board and it worked fine providing more definition in the instruments (EVERYTHING WAS EVEN BETTER).
Now I assembled and installed the large speedball circuit board. I measured the resistance of 12U vs. OB and OA and found that the resistance was not fix but was slowly increasing from some ohms up to very high, staying infinite.
As the resistance was now very high (near infinity) I proceeded with voltage check.The voltage at OB and OA howeverv was apparently higher than 100V. I disconnected the power cord and re-checked the resistance. Now the resistance of 12U vs. OB and OA was zero. I disconnected the large speedball circuit board and still am measuring at Terminal 7 and 9 (B3 and B6) zero ohms.
The large speedball circuit board looks okay, particularly the TIP-50 transistors and heatsinks are correctly installed. I even have measured the connections on the board which were okay.
What has happened and what to do next?
Thanks for your help!
I enjoyed my crack 1.0 (with 240V Bottlehead PT3) for a longer time (EVERYTHING WAS FINE) and decided to upgrade with speedball 1.1.
I assembled and installed after voltage check the small speedball circuit board and it worked fine providing more definition in the instruments (EVERYTHING WAS EVEN BETTER).
Now I assembled and installed the large speedball circuit board. I measured the resistance of 12U vs. OB and OA and found that the resistance was not fix but was slowly increasing from some ohms up to very high, staying infinite.
As the resistance was now very high (near infinity) I proceeded with voltage check.The voltage at OB and OA howeverv was apparently higher than 100V. I disconnected the power cord and re-checked the resistance. Now the resistance of 12U vs. OB and OA was zero. I disconnected the large speedball circuit board and still am measuring at Terminal 7 and 9 (B3 and B6) zero ohms.
The large speedball circuit board looks okay, particularly the TIP-50 transistors and heatsinks are correctly installed. I even have measured the connections on the board which were okay.
What has happened and what to do next?
Thanks for your help!