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Home▸ Forums▸ 68kMLA▸ 128k Mac Analog Board - Help, I need to identify the parts. — #2
Post #2 by zuiko21
Source Forum68kMLA
CategoryTroubleshooting
Post DateSat, 29 Oct 2011 - 20:02
Original URLhttps://68kmla.org/bb/threads/128k-mac-analog-board-help-i-need-to-identify-the-parts.24118/
Post
Hi! It seems most compacts use a similar analog board -- the one documented here is from a Plus, but I identified the components on your picture and they match with those on that document's page 21 (Figure 14). Namely:

C39 = Electrolytic capacitor, 470 µF 10 V

R44, R48 = Resistor, 100 ohm 0.25 W

R45 = Resistor, 1K 0.25 W

Q10 = Thyristor, E0122 (or E0102YA)

Q9 = Transistor, 2N3906

CR28 = Diode, 1N4934

R46 = Resistor, 22 ohm 1 W

R47, R49 = 1.5 ohm (?) 0.25 W

R50 (right corner) = 1.5 ohm 0.25 W

But the nearby transformer (T3?) should be checked with a very accurate DMM prior to connecting upon replacing the damaged components, to be sure... the schematics in the link above have some resistance measures from the transformer.

Hope this helps... but be careful!

mp.ls