Color Classic Needs Serious Help

[rickrob]

I picked up a Color Classic this morning.  Cosmetics are good, a little yellowed/dirty. Came with and external SCSI CD and a carrying case for the whole thing. Pulled the board and it had a Toasted Maxell battery.  Battery gunk everywhere...

Cleaned it up with isopropyl for now and assessed the damage.  So far here's what I've found:

No trace of any of these components is left:

Battery Clip - Gone

C6 - Gone, pad damage

Y1 - Gone

S1 - Gone

These IC's have damage:

U11 - LS245 Data Buffer/Driver Half of the legs on each side are gone, pads gone.

U7 - 341S0417 / 0C25TTLDZ9320 - Made by Moto- Apple specific? -  damaged legs, pads gone

U8 - Can't tell what this is - Several damaged legs

The board itself around these is in good shape and I think it can probably be repaired. It'll just have a lot of blue kynar  wires on it... appears to be just pad damage.

It needs a re-cap as well. C9, C10 are leaking.

So I'll need to determine what the best course of action is with this--

Where can I find replacements for U8, U7, U11-- U11 is common I'd guess, but U7 and U8?

Have to find the values for C6, Y1, and S1

Any recommendations on sourcing these? Or would I be better off looking for a donor board/replacement board?

Not sure how to post pics here, If someone can tell me, I'll upload some to Photobucket.

Thanks,

 

[Macdrone]

That's alot of damage and enough parts another board would be easier. I'll look and see if I have a spare.

 

[TheWhiteFalcon]

Or just go for a board upgrade at this point.

 

[rickrob]

That's alot of damage and enough parts another board would be easier. I'll look and see if I have a spare.

OK Thanks-- I think  this board is similar to the LC II-- Wonder if I can get the parts from one of those...

 

[rickrob]

U7 341s0417...  I think that is  the CUDA chip.

 

[rickrob]

Anyone know if you can swap CUDA chips from one board to another? Or are they board specific?

If they are board specific, then I guess this CC board is junk (or parts)

 

[rickrob]

I picked up an LC550 board from a working machine. No sense trying to fix the old one I guess.

It'll run better with this one anyway.

 

[uniserver]

yes, and now technically you have a Color Classic II.

 

[rickrob]

The machine is running now, but the hard drive is junk. (No surprise) 

Any chance that I could use a Hitachi 73GB Ultra SCSI drive with a 68 to 50 pin adapter and just create a 2GB partition?

I have 6 of these drives...

 

[techknight]

Try it. Some support SE some dont.

 

[rickrob]

It's worth a shot I guess. They're Hitachi Travelstar 10K drives out of a Dell Server

Techknight, What do you mean by SE ?  Just a Mac SE, SE/30?

 

[techknight]

SE as in single-ended bus operations. 50-pin SCSI is SE. 68 and 80 is LVD and rare cases HVD.

 

[rickrob]

OK. Yeah these are LVD/SE with an 80 pin, not 68 pin connector. I thought they were 68.

I bought an adapter that does 80 to 68 and 50 pin. I'll post the results if it works or not.

I guess I should try 7.5.5 and see how big of a partition I can create.

I read that 7.5.5 supports up to 2TB, but my guess is I'll end up with either 2GB  or 4GB

 

[techknight]

If the adapter isnt terminated youll need a terminator.

 

[rickrob]

It's not terminated-- Do you know if one of those pass through active terminators will work ?

http://www.ebay.com/itm/Active-50pin-wire-Internal-Male-Female-cable-cord-Terminator-SCSI1-2-HD-CD-Drive-/301365336055?pt=US_Drive_Cables_dapters&hash=item462ac617f7

 

[rickrob]

Wow. This thing is giving me a fight. Thought I was going to get this working and was almost there.

Analog board now has a problem. it popped the fuse. RP1 is burnt. Totally bummed.

Anyone here repair analog boards?

 

[rickrob]

I've been checking components and so far the only thing bad is the RP1-- It says it's 10 ohms, but It looks more like a thermistor...

 

[rickrob]

So it turns out QP7 , and IRFBC40 power MOSFET is bad too. Totally shorted. So I have to replace that and RP1

RP1 is a 10ohm NTC thermistor, but I have no idea of it's amperage rating and can't find anything on it.

If the main fuse on the analog board is 3.15A, is it safe to say that thermistor is rated at 3A?

 

[techknight]

if the main switching fet is shorted, you need to find out why. 

make sure your horizontal output transistor isnt shorted, check secondary diodes for shorts. 

if you lost the main switching fet, you will need to replace a handful of components with it, such as the controller IC.