jbreezy

I HOPE SOMEONE OUT THERE CAN HELP OR LEAD ME IN THE RIGHT DIRECTION? I NEED THE VALUE OF RESISTORS R23, R24 & R25. THEY ARE TOO BURNED TO READ COLOR CODE. TRANSISTOR T9 IS SHORTED BUT I CAN READ IT'S PART NUMBER.

HELP ANYONE?

THANKS,

Icemark

Don't know the values, but here are the colors and numbers:

R23= Gold/orange/orange/Gold
R24= Gold/Red/red/red
R25= Brown/black/red/gold
T9= No such thing on the main board...There are only 4 transisters on the main board of the Logicon.

Of the four T1, T2,T4 are all 603 74F, and T3 is C2274 KF5F

jbreezy

My main board of the Logicon has 12 transistors on it, T1 thru T12. I've been in electronics for 32 years so I'm pretty sure that I'm not going insane. Someone (or the factory) replaced transistors t4 & t10 before I got the car (which was over 7 years ago), because they used substitute transistors instead of original components. You can also notice that they have been resoldered by the appearence of the solder.I can't believe that there would be such a difference in design but I guess they did. IF you're able to see the color coding on the components then you must have one to look at? This is the largest of the 3 pcbs with 2 large female wiring socket, 2 small inline wiring sockets and 2 soldered on cable harnesses . I unsoldered the longer harness rather than trying to unplug it under the dash. Maybe the attached picture will help. The 2 silver top-hat transistors, as they sometimes call them, are RCA (SK) replacements transistors for t4 & t10 that I mentioned were replaced at some other time.

I really appeciate your response to my plea. My only problem is that we have to be looking at 2 different circuit boards. If you could help me any further I would be in you debt. You can e-mail me at jabrizendine@earthlink.net if you'd like.

Help??

Icemark

Yeah I have never seen that one before...maybe its an early 86???

All the boards I have seen are like this:

Where they use IC transister arrays for the drivers rather than single individual transisters.

Icemark

Hey if you want to paypal me $5 for shipping I'll send this one out to you. I know the air-mix controller is not working, but you might be able to swap it and everything else works.