the cvj30 maintenance manual says:
turn off the main power, and turn it on a little later. if the error occurs again, carry out the following/
1. check the head memory cable
2. replace the headmemory
3. replace the ink slider pcb assy (see 6.5.9)
4. replace the ma pcb ssy (see 3.4.1)
another area mentions that it is highly likely that the U1 of the slider board is damaged.
if you want to eliminate all the charge from the machine. turn off, switch off the back, unplug, and push the front power button slowly several times. this will purge the capacitors of all their juice.
i have all the maintanence manuals for that printer if you want them. there are several mentions of the error 200 throughout several documents. my figure is you will have to pull the board and have macmedia repair it.