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Main => Monitor/Video Forum => Topic started by: NightWolfx03 on January 13, 2016, 12:51:05 pm

Title: Sanwa 27Z21C No Red, need some info
Post by: NightWolfx03 on January 13, 2016, 12:51:05 pm

I have a Sanwa in a Time Crisis 3 machine that has lost all trace of red color. I am pretty sure it's going to be a failed transistor on the neck board, namely a C3502 . Though I figure I should find replacements for the other 2 that are there with each of the C3502 's. I cannot find any info on them, they are labeled C3334 and A1321 .   Any ideas ?


Also what's the best method to test the neck board drive transistors ( Oscope, VOM, Etc ) ? 

Title: Re: Sanwa 27Z21C No Red, need some info
Post by: ed12 on January 13, 2016, 01:07:00 pm

ed

Title: Re: Sanwa 27Z21C No Red, need some info
Post by: obcd on January 13, 2016, 04:19:30 pm

You can exchange the drive transistors of 2 colors. If the transistor is bad, instead of low red you will get low green or low blue.
There has been a time that sanwa monitors came with really bad monitor tubes. It was when the sega outrun II cabinets came out in europe.
Pretty much all of those machines in exploitation suffered from bad picture tubes, usually the red color that became insufficient.
Exchanging the color driving transistors and looking at the color gradation test screen (if you have such) will tell you more.
Usually ebay is the place to find such Japanese transistors.