Tubular Gearhead
Active member
Hi,
I have a G07 that was blowing fuse 902 every time it was powered up BEFORE any work was done to it. The chassis looked like nobody had worked on it before. I recently decided to just rebuild the whole thing, thinking that whatever problem it was would probably get fixed along the way. It still blows F902 EVERYTIME it is powered up. I carefully installed a Bob Roberts cap kit (noting the polarity of all electrolytics, including the one that is frequently mis-labeled on one side of the pcb), new HOT, new flyback, new power diodes (D901-4), new C1106 power regulator, and new width coil. I have checked the degauss circuit and it is fine. I even checked the tube and frame by installing a known working G07 chassis and it works fine, so I know the problem is not the tube or degauss circuit. I have compared readings all over the pcb on both chassis and they seem to be the same for the most part. I have checked most all the transitors on the chassis and they look good. Ohm resistance going into the ac plug is the same on both chassis. Large R01 reads 220ohms on both the bad and working chassis.
This one really has me stumped... I feel like I have looked for all the usual suspects and still don't understand why it still ALWAYS blows the fuse. Maybe the focus block???
I know this one is a tough one, but if any of the gurus have any advice I would sure appreciate it!
Thanks in advance.
I have a G07 that was blowing fuse 902 every time it was powered up BEFORE any work was done to it. The chassis looked like nobody had worked on it before. I recently decided to just rebuild the whole thing, thinking that whatever problem it was would probably get fixed along the way. It still blows F902 EVERYTIME it is powered up. I carefully installed a Bob Roberts cap kit (noting the polarity of all electrolytics, including the one that is frequently mis-labeled on one side of the pcb), new HOT, new flyback, new power diodes (D901-4), new C1106 power regulator, and new width coil. I have checked the degauss circuit and it is fine. I even checked the tube and frame by installing a known working G07 chassis and it works fine, so I know the problem is not the tube or degauss circuit. I have compared readings all over the pcb on both chassis and they seem to be the same for the most part. I have checked most all the transitors on the chassis and they look good. Ohm resistance going into the ac plug is the same on both chassis. Large R01 reads 220ohms on both the bad and working chassis.
This one really has me stumped... I feel like I have looked for all the usual suspects and still don't understand why it still ALWAYS blows the fuse. Maybe the focus block???
I know this one is a tough one, but if any of the gurus have any advice I would sure appreciate it!
Thanks in advance.

