Tommybiscuit
User
Hi There,
Hoping for some help. I have a Sega super hang on cabinet that has been on a slow restore for a few years. Over the winter, I decided to get this thing finished. Physically the thing is in good shape, now just piecing bits together to finish off.
However, I am having some issues with the monitor I thought I could resolve but I have hit a brick wall.
The chassis was in a poor state with 75% caps leaked and the fly back cracked through the middle. I cleaned the board, replaced the caps, replaced the flyback, replaced the problem large resistors and fixed the damaged and lifted traces around these, also reflowed the board. Anyway, put it all together power it up and R98 went up in smoke. Later found the CRT ground had mis lodged, taking out the HOT and R98. Anyway, put it all back together, went through the board again testing the large resistors, diodes anything that I thought could be affected replaced the HOT and R98. Powered on!
Initially things were going good, familiar sign of static on the screen and life. However, after about 30 seconds R98 went up in smoke again. Took the thing apart went back to look at the schematics and looked over everything around R98 - everything checked out other than the horizontal width coil.
After removing the coil from the board and removing the cover, clearly the width coil had snapped in a previous life with the core snapped in two. Also the wire within had clearly been re-wound by hand after failing probably years back. What I am unsure off is would the damaged coil cause R98 to go up in smoke?
Within the coil, the wire is clearly broken in two. I know this as there is a short piece of wire (that's soldered to the leg) that has just been wound round the larger length of wire, presumably connected to the other soldered leg (I haven't unwound it to confirm this). I know that these coils are like gold dust so I am unsure if I am going to be able to obtain another one to retest - other than finding an old board with one on. There obviously no continuity between each side of the coil but I am unsure how these actually work and if there should be?
Are there any other alternative coils that could be used as a replacement anyone is aware of?
Any advice or pointer appreciated.
Thanks,
Hoping for some help. I have a Sega super hang on cabinet that has been on a slow restore for a few years. Over the winter, I decided to get this thing finished. Physically the thing is in good shape, now just piecing bits together to finish off.
However, I am having some issues with the monitor I thought I could resolve but I have hit a brick wall.
The chassis was in a poor state with 75% caps leaked and the fly back cracked through the middle. I cleaned the board, replaced the caps, replaced the flyback, replaced the problem large resistors and fixed the damaged and lifted traces around these, also reflowed the board. Anyway, put it all together power it up and R98 went up in smoke. Later found the CRT ground had mis lodged, taking out the HOT and R98. Anyway, put it all back together, went through the board again testing the large resistors, diodes anything that I thought could be affected replaced the HOT and R98. Powered on!
Initially things were going good, familiar sign of static on the screen and life. However, after about 30 seconds R98 went up in smoke again. Took the thing apart went back to look at the schematics and looked over everything around R98 - everything checked out other than the horizontal width coil.
After removing the coil from the board and removing the cover, clearly the width coil had snapped in a previous life with the core snapped in two. Also the wire within had clearly been re-wound by hand after failing probably years back. What I am unsure off is would the damaged coil cause R98 to go up in smoke?
Within the coil, the wire is clearly broken in two. I know this as there is a short piece of wire (that's soldered to the leg) that has just been wound round the larger length of wire, presumably connected to the other soldered leg (I haven't unwound it to confirm this). I know that these coils are like gold dust so I am unsure if I am going to be able to obtain another one to retest - other than finding an old board with one on. There obviously no continuity between each side of the coil but I am unsure how these actually work and if there should be?
Are there any other alternative coils that could be used as a replacement anyone is aware of?
Any advice or pointer appreciated.
Thanks,
