I wrote a mail to Christ from colourclassicfaq.com about the Color Classic jumping screen problem. A short version of my mail:

Dear Chris,

... My problem is the screen on my CC.
After careful dry cleaning the board from dust the desktop screen jumps for some pixels up and down.
I washed the MoBo because one capacitor had leaked and the PRAM B. was also leaking. I wonder because I only cleaned it. Now it jumps and sometime the complete screen shrinks to a gray shaking line. Annoying. Do you know a solution to solve the problem ? Any help would be great!
Thank you for your page! Greetings from Berlin

Oliver

Chris replied soon:

That's probably got nothing to do with the motherboard. Video problems like that are usually related to the analogue board, possibly a cold solder joint somewhere.

I never thougt on a problem with the analogue board...
Maybe a project for the Retrochallenge Summer see you!

I have a Performa 630, one of the Macs listed at colourclassicfaq.com for a "Takky" CC upgrade, but this seems to involve a connector change on the board, and the board seems not to fit - the Performa 630 board is longer than the one from the CC. So here is the decision: I leave my CC / jumping screen for now and try to set up the Apple //e Card in a Macintosh LC II.

The Apple //e card is not an emulator card - it is in fact a complete running Apple //e with original CPU.

It still jumps...

I dried the MoBo for 48 hours and it was no problem to boot it up but the jumping screen still remains. I wonder because it hasn´t jump as it was dirty... Keep them dirty... One of the capacitors leaked and the PRAM battery too - may that has caused the problem. Don´t really know.
Does anyone had the same Problem before ?

Sometimes the jumping goes half the screen up and down for seconds. If the MoBo stays like that the Color Classic is no more fun.

Replacing the Motherboard of my Color Classic ?

A Macintosh Color Classic can be upgraded a number of ways. One thing to do is to replace the 16MHz speed 68030 motherboard with a 33MHz LC 575 motherboard.

At Lowendmac.com I found the following infos:

The Color Classic shared the motherboard design of the LC II - equally limited in RAM expansion, constricted by a 16-bit data bus, and able to use 16-bit PDS cards designed for the LC. The only significant difference is the presence of a socket for adding a 68882 math coprocessor.

and here "Classic gets Color":

By grafting a 10" color screen with an LC II/Classic II motherboard in a case just a bit larger than that used by earlier compact Macs, the Color Classic was born.

At wikipedia I found this:

...The LC 575 model is a favorite motherboard donor for those wishing to upgrade the Color Classic to a faster class of processor.

Macintosh LC 575

• Also sold to consumers as the Performa 575
• Performa 577, the Performa 575 with a 320 MB hard drive
• Performa 578, the Performa 577 with 8 MB of RAM instead of 5 MB

at colourclassicfaq.com

What motherboards can I use for a "Mystic" upgrade?

There are three motherboards that can be used for the Mystic upgrade: the Performa/LC 575, 577, and 578 boards. All three motherboards are identical in specification; the model number differences are due to factory software and CD-ROM/hard drive configuration differences that were independent of the motherboard.

You CANNOT use a 580-series board. The 580-series boards are identical to the 630-series boards and require the Takky surgery.

A "Takky" upgraded CC is one that has been modified to accept a logic board from any of the following computers:

• LC 580, 630, and 630 DOS Compatible
  
• Quadra 630
  
• Performa 580 and 588
• Performa 630 and variants (631, 635, 636, 637, 638)
• Performa 630 and 640 DOS Compatible
• Performa 5200 and variants (5210, 5215, 5220, 5260, 5270, 5280)
• Performa 5300 and 5320
• Performa 5400 and variants (5410, 5420, 5430, 5440)
• Performa 6200 and variants (6205, 6210, 6214, 6216, 6218, 6220, 6230, 6260, 6290)
• Performa 6300 and variants (6310, 6320, 6360)
• Performa 6400 and variants (6410, 6420)
  
• Power Macintosh 5200, 5260, 5300, 5400, and 5500
• Power Macintosh 6200, 6300, 6400, and 6500
  
• Twentieth Anniversary Macintosh

Let´s have a look in the shed...

• Macintosh Color Classic Enhancement Page
• MicroMac 68040 LC575 Logic Board Upgrade
• Improve Resolution of Color Classic Built-in Display
• Power Color Classic (G4) by Stuart Bell
• Wikipedia
• The Macintosh Colo(u)r Classic FAQ
• colourclassicfaq.com

Ouups... The Screen on my Colour Classic jumps.

As I removed the MotherBoard (MoBo) from the Colour Classic (CC) it was very dusted and the PRAM battery was leaked out. I cleaned the MoBo and replaced the battery. After adding the Apple IIe card and replacing the MoBo in the CC the screen jumps up and down from time to time (only a few pixel but it is very annoying) and little gray stripes come up for ca 1/10 seconds all over the screen.

I removed the Apple Card and the battery - still jumping.

Now I decided to was the MoBo because one of the capacitors (hell...) seem to leak too. I let you know about the result.

Does anyone had the same Problem ?

I need to format the HD and create a second (PRO-DOS) Partition, install the driver and them I am ready to go...
I upload a video of the first Test run.

Build in Apple IIe Card with the Diskdrive and Joystick connectors. I hope my external Apple //c drive will work, if not I need to get an Apple Platinum 5.25 drive (Apple //gs).

Does anyone have an Apple Platinum Drive in the shed?

The Apple IIe Card onboard the CC Motherboard (on the right side), new battery attached.

Leaked Battery needs to be replaced.

Color Classic Motherboard

The Apple IIe Card is only compatible with computers that have the LC style processor direct slot (PDS) and do not require 32-bit addressing. You must turn off 32-bit addressing to use the card.
Compatible Macs:

• Macintosh Color Classic
• Performa 400 series
• Macintosh LC/Performa 500 series computers (except the Macintosh LC 580 and Performa 580)
• Macintosh LC series computers except: Macintosh 630 family, Power Macintosh 5200 and 5300 LC
• Macintosh Performa 5200, 5300, 6200, 6300 series

I decided to try it with my Color Classic, if there are any problems I use a Macintosh LC III. I will add the Card this evening and let you know about the result. I found the needed Driver at apple.com.

The Apple IIe Card is a PDS card that emulates an Apple IIe computer. It basically turns your Macintosh into a fully functional Apple IIe. All the functionality of an entire Apple IIe computer is built into a single card. Today, about the only compelling reason to use an Apple IIe Card would be to transform Apple IIe software from disk image format into real 5.25" floppies for use in a real Apple IIe.

Here we go starting with a project I cant acomplish the last Retrochallenge. I like to connect one of my Apple II with one of my Macintosh computers to transfer Data stored in the Internet to my Apple II using the Macintosh. OK - I know - this has been done tenthousand times, but not by myself! So I need to get this done.

This evening I start with a research and I found some good pages by searching on the evil engine for:
transfer apple II data to macintosh

apple.com: Apple II: Transferring Data to a Macintosh (10/94)
vectronicsappleworld.com: This infos will get it running !

The Equipment Needed (quoting vectronicsappleworld.com)

... I have had difficulty trying to use a Macintosh running OS X to accomplish the transfer. OS X has rather flimsy floppy support. My third party, external 1.4 floppy drive does not supports 800K floppies. It will format in ProDOS but sometimes it gives me errors when I try to copy Apple II files to it. This has made it necessary to move Apple II files on MacOS 1.4MB formatted floppies. But in order to use Copy II Plus, you must use an 800K floppy. My solution was to buy a Macintosh LC III computer and an Apple IIe Card. Any model of LC Macintosh will work (even a Color Classic). The LC III, like the other LCs, has one expansion slot, Processor Direct Slot or PDS. In the early 90s, Apple made an Apple IIe PDS card that basically turns your Macintosh into a functioning Apple IIe. My LC III has an 80MB hard drive that is partitioned with one 10MB partition formatted in ProDOS and the other 70MB partition formatted in MacOS 7.5. The 10MB ProDOS partition functions like a real Profile hard drive and is set as the startup drive for the virtual Apple IIe...

Nice - I have a Macintosh LC III, an Apple card and the needed Floppy drives in my collection. A good start

I am happy for every tip or link you can give me.

Other interesting founds:

apple.com: Run Apple II DOS 3.3 files on a Macintosh (512Ke or newer)
gambas page: How To Transfer Files From PC to Mac