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Hello to everyone here on the forum. Long time lurker, first time poster. My condolences to everyone for the sad loss of Enzo.
I have a GK 1001RB-2 on the bench I am trying to get running. First point to make is that this main power PCB shows 206-0260-A7 and I cant seem to find any schematic or doc showing the difference from A6. The previous owner stated they saw smoke. I am not able to find any physically damaged components besides the looks of R70 and R71 getting hot enough to make heat marks on the PCB and cause solder to deteriorate a little. Both R70 and R71 test out in spec out of circuit. Resoldered a few joints that looked suspicious from the ever-known issue of non lead solder usage. Resoldered all jacks. Checked majority of the diodes and resistors. Under heatsink, resistors and transistors that were able to be tested in circuit passed. Rectifiers seem to pass. Startup with Variac and limiter. Initial start up the fan wants to turn a few clicks and stops. At 120v I get Red power light and no change to Blue (or Green for that matter on some versions). During power on, there is no voltage at the bias test points. No DC offset on speaker outputs without load. After power off and another component sweep through, I find that C22 (600v mica 560pF) is reading 880pF out of circuit. Could this be causing some issues? I will have to order some of these as I do not have in stock. I'm not at my notes right at the moment but there were also a few diodes that did not have voltage was expecting (0v).
I have a GK 1001RB-2 on the bench I am trying to get running. First point to make is that this main power PCB shows 206-0260-A7 and I cant seem to find any schematic or doc showing the difference from A6. The previous owner stated they saw smoke. I am not able to find any physically damaged components besides the looks of R70 and R71 getting hot enough to make heat marks on the PCB and cause solder to deteriorate a little. Both R70 and R71 test out in spec out of circuit. Resoldered a few joints that looked suspicious from the ever-known issue of non lead solder usage. Resoldered all jacks. Checked majority of the diodes and resistors. Under heatsink, resistors and transistors that were able to be tested in circuit passed. Rectifiers seem to pass. Startup with Variac and limiter. Initial start up the fan wants to turn a few clicks and stops. At 120v I get Red power light and no change to Blue (or Green for that matter on some versions). During power on, there is no voltage at the bias test points. No DC offset on speaker outputs without load. After power off and another component sweep through, I find that C22 (600v mica 560pF) is reading 880pF out of circuit. Could this be causing some issues? I will have to order some of these as I do not have in stock. I'm not at my notes right at the moment but there were also a few diodes that did not have voltage was expecting (0v).
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