C224 dev unit

[Boltaction]

Hey everyone

I know there are techs on here who are converting black 4 series dev units to colour. I have done this twice with cyan and both times the t/c ratios are higher than they should be. The first one gives constant C2552 codes and I have had to replace it. The second one hasn't coded yet, but the t/c ratio is at 8.50, which is higher than the average of around 6.25.
I may have not done the conversion properly, so if someone has the procedure that would be great.
The way I did it was to put the dev unit in a machine in the shop and run 150 or so sky shots until the colour was pretty close. Is there anything else needed besides the dev chip?
Thanks

What is your procedure for converting the Black to Colour? Is there a way to order C/M/Y developer or do you have to purge the black toner with sky shots and then add color toner to the developer by hand and then replace the TD sensor?
I've never come across this before, curious to know logistically how effecient this method is. Does the cost of labor for the conversion outweigh the cost of the color developer unit?

[allan]

Now converting the C360 dev tanks is labor intensive but the 4 range not so much.
You need 3 K dev tanks and 3 unused chips a ream of paper and some time.
I use a machine at the office to do this but only replace the fuses and not the chips.
You need only to place the slides/guides from the color tanks onto the new K tanks to get them to fit.
Then make sure they reset the counters and then run half tones until the colors are bright and right.
Do gradation adjustment.

[copier addict]

Now converting the C360 dev tanks is labor intensive but the 4 range not so much.
You need 3 K dev tanks and 3 unused chips a ream of paper and some time.
I use a machine at the office to do this but only replace the fuses and not the chips.
You need only to place the slides/guides from the color tanks onto the new K tanks to get them to fit.
Then make sure they reset the counters and then run half tones until the colors are bright and right.
Do gradation adjustment.

What exactly do you mean when you say "only replace the fuses and not the chips"? The chip(TD sensor) is a printed circuit board with tiny components on it.

[tsbservice]

Another idea. If TCR sensor and reset chip are integrated in one board(in this case you replace them both).
You can use TCR level setting to bring down TCR by max -1.5%(-3), which in your case would be near optimal level.