(Topic ID: 205445)

Sega Baywatch - CPU Diode and Transistor ID


By bpeed99

1 year ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by zimjoe
  • No one calls this topic a favorite

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baywatchConnector12 (resized).png
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#1 1 year ago

Can anyone ID this diode and transistor replacement part#? After owning the machine for a few months, I realize now that the lower gate has not been working. I believe the issue is tied to the #25 transistor and this burnt diode. Any advice is appreciated. What could have possibly caused this?

DSC_0004 (3) (resized).JPG

#2 1 year ago

Tip 102 transistor 2n4401 predriver. Not sure on the resistor.

#3 1 year ago

Thanks for the quick response!

#4 1 year ago
Quoted from chad:

Tip 102 transistor 2n4401 predriver. Not sure on the resistor.

Here is the schematic section for the number 12 connector. Looks like the resistor is 68ohm 1/2w. I checked the code against your picture Color Code: Blue, Gray, Black, Gold and it looks right. https://www.greatplainselectronics.com/proddetail.asp?prod=RCF1/2-68

The tip102 is a direct replacement for the tip122 on the schematic, but it is a higher amperage. So, do what Chad says When I replaced the flasher section on my SST, I used tip102s. The tip122s just were marginal when they were installed.

baywatchConnector12 (resized).png

#5 1 year ago
Quoted from zimjoe:

Here is the schematic section for the number 12 connector. Looks like the resistor is 68ohm 1/2w. I checked the code against your picture Color Code: Blue, Gray, Black, Gold and it looks right. https://www.greatplainselectronics.com/proddetail.asp?prod=RCF1/2-68
The tip102 is a direct replacement for the tip122 on the schematic, but it is a higher amperage. So, do what Chad says When I replaced the flasher section on my SST, I used tip102s. The tip122s just were marginal when they were installed.

Thank you! After Chad's message last night, I must have looked at the color code on the resistor a dozen times in the machine and at the photo to order the parts. I simply couldn't make out the colors (blue vs black/gold vs grey/silver) and wasn't in the mood to take the board out last night. This gives me much more comfort. Thanks again!

#6 1 year ago
Quoted from bpeed99:

I must have looked at the color code on the resistor a dozen times in the machine and at the photo to order the parts. I simply couldn't make out the colors (blue vs black/gold vs grey/silver) and wasn't in the mood to take the board out last night. This gives me much more comfort. Thanks again!

I triple checked it too. I'm not an expert like many people on this forum. Pinside is such a great resource for questions like this. The best part is that even if I had been wrong, someone would have jumped in and corrected me. The only thing better than being wrong, is being publicly wrong

The guy at GreatPlainsElectronics.com is g-p-e here on pinside. If all else fails you can ask him when placing an order. He's helped me out a few times.

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