I mentioned in the "Thoughts on buying non-working or for-parts Oscilloscopes" thread that I picked up a "for parts or repair" function generator on Ebay.
It's a Tektronix CFG-280. Looks to be in decent shape, pretty clean.
I first noticed a rattle, and upon dis-assembly found a resistor that had de-soldered itself.
I replaced it and did a quick power on test. That resistor and a transistor got hot fast, so no point leaving it on for more tests.
It appears that Q522 (a 2N2905a) is shorted, and it's neighbor Q520 (2N2219A) is bad (Peak tester says unknown bad part DMM diode test reads voltage drop in both directions)
R522 and R520 both appear to have been running hot, and the colours are a bit washed out. Looks like red brown black or . Both measure 33.4 ohms out of circuit.
Before I blindly replace the transistors, I'm wondering if anyone knows where I might find a service manual or schematic?
Or does anyone know the value for R520 and 522?
I have googled, and found a possible service manual on a pay file transfer site, but I'm not convinced it's legit.
Thanks.