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Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: powerball on March 25, 2016, 09:07:35 am

Title: ATARI TETRIS - Identifying missing component on PCB
Post by: powerball on March 25, 2016, 09:07:35 am

Need help to identify missing transistor on the PCB as marked in picture.

Anyone got a schematic or a board to verify which type of transistor used ?

Title: Re: ATARI TETRIS - Identifying missing component on PCB
Post by: ed12 on March 25, 2016, 01:48:49 pm

er u mean by-pass filter
.01/50

ed

Title: Re: ATARI TETRIS - Identifying missing component on PCB
Post by: powerball on March 25, 2016, 05:41:51 pm

No, there's a connection point With 3 solder pads. I'm almost sure that a transistor should be there.

Title: Re: ATARI TETRIS - Identifying missing component on PCB
Post by: CheffoJeffo on March 31, 2016, 06:06:16 pm

IIRC the consensus is that there is no schematic out there for Atari Tetris. The closest I have seen is a partial of R20,30,40 in the Troubleshooting section of the manual.

Pictures of the board appear to show a transistor there. Repair logs talk about a transistor at B10, but nobody seems to mention the specifics. If I had to guess completely blind, I would guess 2N3904.

The good news is you don't have to guess (and I can't believe I am going to plug his YouTube channel) that BYOACer ChanceKC's pal Josh did a video on repairing the audio section of an Atari Tetris board ... so he has one and can check for you (hit him up by PM or over on KLOV).

https://youtu.be/Wv2QHW0zW6c

Title: Re: ATARI TETRIS - Identifying missing component on PCB
Post by: CheffoJeffo on March 31, 2016, 06:20:11 pm

(http://cheffojeffo.files.wordpress.com/2016/03/ataritetrisb10.jpg)

2N5304?