acblunden2
Active member
ID Sega Astro City Monitor & Help Troubleshooting
Picked up a stock Astro City. Everything appears to be original including the PSU. Here are the pics of the chassis:
https://goo.gl/photos/uHpayCndAyLjokZ38
In pic 3, silk-screened on the board is 'NANAO 05A00362G1'. Google-fu shows that it is a Nanao MS8-29FSG. Please confirm.
The issue is that the monitor is dead. I pulled the chassis and could see that fuse (F902) was burnt. A check with the multimeter confirmed this. I replaced this fuse, reconnected everything, then repowered it back up. Still nothing. No neck glow. Nothing. Retested F902 and found it was re-blown. Fuse (901) was intact before I replaced F902, and after I replaced F902.
I cannot see an ISO/stepdown transformer in this anywhere. Measuring AC voltage coming off the PSU indicates 121vac. From there, a wire connects it to the monitor. Although, I cannot measure the voltage at the monitor connection since the pins are sheathed in a very tight connector. Assuming he voltage is the same as there is no transformer in sight. I read that the PSU does the step down conversion, but why am I getting 121vac off the PSU?
Do I need to add an ISO transformer or convert 120vac to 100vac prior before powering the cab? I had a candy cab before and do not remember having to have to do this before.
Picked up a stock Astro City. Everything appears to be original including the PSU. Here are the pics of the chassis:
https://goo.gl/photos/uHpayCndAyLjokZ38
In pic 3, silk-screened on the board is 'NANAO 05A00362G1'. Google-fu shows that it is a Nanao MS8-29FSG. Please confirm.
The issue is that the monitor is dead. I pulled the chassis and could see that fuse (F902) was burnt. A check with the multimeter confirmed this. I replaced this fuse, reconnected everything, then repowered it back up. Still nothing. No neck glow. Nothing. Retested F902 and found it was re-blown. Fuse (901) was intact before I replaced F902, and after I replaced F902.
I cannot see an ISO/stepdown transformer in this anywhere. Measuring AC voltage coming off the PSU indicates 121vac. From there, a wire connects it to the monitor. Although, I cannot measure the voltage at the monitor connection since the pins are sheathed in a very tight connector. Assuming he voltage is the same as there is no transformer in sight. I read that the PSU does the step down conversion, but why am I getting 121vac off the PSU?
Do I need to add an ISO transformer or convert 120vac to 100vac prior before powering the cab? I had a candy cab before and do not remember having to have to do this before.

