Pimpbot5000
Member
Documenting this here in case it's helpful to anyone. All my info is from the 6100 FAQ and scouring other repair threads.
I bought this 6100 HV unit non-working from Komodo. Upon power up there was no HV, and after a few minutes R925 smoked.
Looking more closely, T901 was swollen and leaking.
For these symptoms, the 6100 FAQ points to Q905. I pulled that transistor. I think this is an MJE 171? If so it's the wrong part, as Q905 should be a 2N6557 NPN transistor.
I installed an MJE340 at Q905, modifying it to accommodate the board's CBE layout, as described in a repair thread by Level42.
I installed a reproduction T901 from Dezbaz. In addition, I added a 250ma Pico fuse in-line with R917 to hopefully protect T901 in the future. While I was at it I installed a socket and new 555 at IC901.
I fired it up and HV was restored.
I bought this 6100 HV unit non-working from Komodo. Upon power up there was no HV, and after a few minutes R925 smoked.
Looking more closely, T901 was swollen and leaking.
For these symptoms, the 6100 FAQ points to Q905. I pulled that transistor. I think this is an MJE 171? If so it's the wrong part, as Q905 should be a 2N6557 NPN transistor.
I installed an MJE340 at Q905, modifying it to accommodate the board's CBE layout, as described in a repair thread by Level42.
I installed a reproduction T901 from Dezbaz. In addition, I added a 250ma Pico fuse in-line with R917 to hopefully protect T901 in the future. While I was at it I installed a socket and new 555 at IC901.
I fired it up and HV was restored.


