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Home▸ Forums▸ 68kMLA▸ Performa 200 — #24
Post #24 by uniserver
Source Forum68kMLA
CategoryHardware
Post DateSat, 18 Apr 2015 - 10:54
Original URLhttps://68kmla.org/bb/threads/performa-200.1773/
Post
**unless you used  heat gun instead of a hair dryer.

or the person before you baked it.

letting a board sit wet for 2 days is really not cool... always compressor dry these things off right after a wash.

there looked like 2 shorted areas on the cpu legs fallen.

also the sound I/C controls reset with these , many times i'v had to hot air off the sound IC, only to find rotted up traces, roted up pads. under it.

also I believe U14

ram chip goes bad,   from the cap goo.   its in other classic ii threads, i think the first 2 ram chips closest to the caps there can be subject to cooked ram chips.   ( witch the bad ram shows no physical signs of being dead, just maybe some rot on the legs.

so i think you should start with the ASC.

u14 maybe u13(replace)*1,  then ASC pads and traces (have to remove the IC),  EGRET *2

are all issues that arise with the Classic II.

Also BOMARC just completed his final Documentation and is going to be drafting up a schematic for this classic II

well the 4 rom chip version but they are mostly close enough... 

*1 you can scavenge a ram chip from a basically any mac that has 4mb soldered onboard.

even the 6100 with 8mb soldered on board.  even a LC depending on what parts boards you have lying around.

*2 EGRET,  you can use the EGRET from LC-I / LC-II if needed.  not sure if the EGRET from LC-3 works... 

however i do think the EGRET from a LC-III will work with the Color Classic, those also have ERGET issues ( cap goo related )