chinjazz
Member
:Hello: some scattered information, hope somewhat helpful.
The blue resistor (if that is a dark blue stripe on the light blue housing) is 68 Ohm. The other Green a 10 Ohm unknown tolerance. If the stripe after the black is a metallic the tolerance, Gold 5%. for other resistors, Brown 1%, Red 2%, a leap to Silver at 10%. The resistors do look corroded. The transistor (three lead IC) C3206, or 2SC3206 appears to be KEK Korean Electronics. However data listed as an NPN? transistors can show odd results when damaged. However a solution for outer trace Ic's such as 3 pin transistors is to try to follow the Emitter track to either a positive or a lead to common. P channel would usually be Emitter to Positive voltage source, the N channel Emitter to common ground. This can be used under typical situations to identify the type on an existing legible pc board. There are however in some circumstances when transistors are used in many other ways. The transistor (if my results are correct) is a Triple Diffused PCT type, meaning its manufacturing method. Features are 150 Volt DC @ 50mA. a low power switch. So more than likely if the part number matches is a sinking transistor switch configuration, turning on something elsewhere. Cases such as near that ribbon connector? the other end board may require that transistor to act as a switch on to function from the board it's on. Or it could be just for that board, the tracts are a bit tough to see clearly as if that transistors leads connect to that ribbon connector or turn back to that board. as for the IN4148 Schotty diode they are easy to burst when reverse voltage breakdown occurs due to over current or reverse high voltage spike that can result in a crack or complete small firecracker effect.
Hi Grom Tag! While I'm a relatively new member, I see you are as well, and welcome to the forum!
Thanks for your the detailed feedback! Wow this could be a huge lead for me.. I'll search for the KEK Korean Electronics parts now.
Yes those two resistors were corroded, what seems to be by what came out of the transistor.
I took the two resistors and transistor off the board to isolate and test them.. Resistors showed some sign of life, but I'll replace them
anyway. I put the project on hold because of the dead end with this transistor, and priorities for looking for work.
Where the two resistors and transistor was located definitely was in the path of the ribbon connector which connects
to the pre-amp board which is where the main volume and frequency controls are - see the two arrows and writing on the board:
Thanks, I'll dig in some more with your info
Cheers!