I have samsung C430W printer..I replace the transfer imaging unit but still it showing to replace it..how can I reset the page count of transfer imaging unit...please help...

See page 103 of http://downloadcenter.samsung.com/content/UM/201112/20111205134621713/EN/English.pdf. It looks like the clx6220 uses a transfer belt to transfer all the different toner powders to the paper.
see
http://www.genuinetonercartridges.com.au/genuine-samsung-clp-620nd-clp-670nd-clx-6220fx-clx-6250fx-page-image-unit-transfer-belt.html
The transfer belt unit is refered to also as the image unit !
Also each toner cartridge contains the OPC drum and is replaced when you replace a toner cartridge by the look of it.
You need a transfer belt to transfer the image to the paper and this is why they call it an image unit.
I am guessing that the transfer belt needs replacement !

Dear
either you buy the toner chips and image unit chips or reprogram the 24c04 on MPBA to factory value.
Thanks.

for reset image transfer roller, fuser follow below mentioned procedure:
1.open front door> menu #1934 menu> tech mode>data setup>clear count> password--1934> clear counts,image transfer roller, fuser etc.

Dear
Its difficult to reset the image unit, however if you can avail the crum chip of the image unit will possible. the chip store the page count as per the predefined quantity, when its achieved it locked also the chip is encrypted.
Also its possible if the hex file of the main PBA chip copied from a fresh new printer will reset all.
You may also try with online shops viz.ebat,amazon etc.
Thanks.

You can check the level of each item.
1. In ready mode press the Menu button on the control panel everal times until you see 'Setup 'on the bottom line
of the display.
2 Press the Enter button to access the menu.
3 Press the scroll button until 'Maintenance ' displays on the bottom line.
4 Press the Enter button
5 When 'Check Others ' displays on the bottom line,,press the Enter button .
6 Press the scroll button until the item you want to check displays on the bottom line.
7 Press the Enter button The display shows the percentage of item.
8. Press the scroll button display either 'Image Count' or 'Reset'
9a. Choose 'Reset' and press enter to reset the counter after replacing a consumable item
or
9b Choose Image count to display the counter.
10. Press the Upper Level button to return to step 7 and select a different choice or press it a second time to return to step
6 and choose a different item.
11. To return to the Ready condition press the Upper Level button several times until 'Ready' appears in the display.

To fix this error, you will need to replace the transfer belt and/or reset the transfer belt count on your printer. If you are happy the the print quality of the printer, then you can try to reset the transfer belt count and that will clear the error. Otherwise you need to get a replacement transfer belt and swap it out before resetting the count.

To remove your existing transfer belt, you need to open the front panel, and remove the imaging unit by pulling the green handle. The belt is located above the imaging unit. Pull the belt down to release and then pull it straight out of the machine. Take your new belt and slide the back into the machine and push the front of the belt up to lock in place. Then you need to reset the belt count.

To do this, follow the steps below.

1. Enter Tech Mode by pressing [MENU] [#] [1] [9] [3] [4]
2. If you do not see the Tech Mode menu press the menu button again. (You need to enter the key sequence quickly.)
3. Select Tech Menu
4. Select DataSetup
5. Arrow to Clear Counts and press OK
6. Enter Password 1934
7. Arrow to Transfer Belt and press OK.

Hope this helps you.

To fix this error, you will need to replace the transfer belt and/or reset the transfer belt count on your printer. If you are happy the the print quality of the printer, then you can try to reset the transfer belt count and that will clear the error. Otherwise you need to get a replacement transfer belt and swap it out before resetting the count.

To remove your existing transfer belt, you need to open the front panel, and remove the imaging unit by pulling the green handle. The belt is located above the imaging unit. Pull the belt down to release and then pull it straight out of the machine. Take your new belt and slide the back into the machine and push the front of the belt up to lock in place. Then you need to reset the belt count.

To do this, follow the steps below.

1. Enter Tech Mode by pressing [MENU] [#] [1] [9] [3] [4]
2. If you do not see the Tech Mode menu press the menu button again. (You need to enter the key sequence quickly.)
3. Select Tech Menu
4. Select DataSetup
5. Arrow to Clear Counts and press OK
6. Enter Password 1934
7. Arrow to Transfer Belt and press OK.

Hope this helps you.

When transfer belt count 60.000 image need to reset.
Transfer belt (and other consumables) reset follow this procedure:

1. go in tech mode:
Press consistently menu -> # -> 1934 -> menu
2. in tech mode find ->consumables counter -> transfer belt ->reset
3. after 20 sec. power off and power on

If this not help try this:
1.MENU # 1934 MENU
2.Tech Mode (not User Mode)
3.DataSetup
4.Clear All Memory

i got this info from www.partshere.com site - they have most service notes for hp printer and sell most hp parts, including maintenance kits. I hope info. bellow is helpfu.

Replacing the transfer unit
Replace the transfer unit when the printer control panel displays REPLACE TRANSFER
KIT. The image transfer kit contains a replacement transfer unit for this printer.
WARNING! Remove any jewelry or any other metal items from your body to avoid electric shock.

1. Lift the front door handle and pull down the front door.
2. Grasp the right blue handle. Press and hold down the blue button. Slightly lift the right
side of the transfer unit.
3. Grasp the left blue handle and lift to remove the transfer unit from the printer.
4. Using handles, remove the new transfer unit from the bag. Use the blue handles on both
sides to hold the transfer unit.
5. Place the new transfer unit on a flat surface. Remove the orange shipping locks.
6. Guide the left side of the transfer unit into the front door of the printer. Insert the two
pegs on the left side into the holes, and then lower the right side into the door.
7. Make sure that the blue button on the right blue handle has released (popped up). If the
button has not released, grasp the right blue handle and pull the transfer unit toward you.
8. Firmly close the front door.
9. After the front door is closed, after a short time, the printer control panel displays the
message NEW TRANSFER KIT.
10. If the message NEW TRANSFER KIT does not appear, you must reset the transfer unit
count. To reset the transfer unit count, go to step 11.
11. On the printer control panel, press to highlight YES, and then press to select it. The
transfer unit count is reset, the printer recalibrates, and then the printer is ready to use.
NOTE If the old transfer unit was not at end-of-life when it was replaced (for example, if it was
damaged), the transfer unit count must be reset using the printer control panel.
Replacing the transfer unit when it is not at end-of-life
If you replace the transfer unit when it is not at the end-of-life, for instance if it is defective,
you will need to reset the transfer unit count and then calibrate the printer, through the
control panel.


To reset the transfer unit count, do the following:

1. Press MENU to enter the MENUS.
2. Press to highlight Configure Device.
3. Press to select Configure Device.
4. Press to highlight RESETS.
5. Press to select RESETS.
6. Press to highlight RESET SUPPLIES.
7. Press to select RESET SUPPLIES.
8. Press to highlight NEW TRANSFER KIT.
9. Press to select NEW TRANSFER KIT.
10. Press to highlight YES.
11. Press to select YES.
To calibrate the printer, do the following:
1. Press MENU to enter the MENUS.
2. Press to highlight Configure Device.
3. Press to select Configure Device.
4. Press to highlight PRINT QUALITY.
5. Press to select PRINT QUALITY.
6. Press to highlight CALIBRATE NOW.
7. Press to select CALIBRATE NOW.
8. Wait for the printer to calibrate.
The transfer unit count is reset and the printer is ready to use.

see pictures on link:
http://www.partshere.com/Models/Q5990A/CLJ_3550%203500%203700Installation_n_config.PDF

If the messages are because the two units have reached their rated page count, you need to reset this via the printer menu system - see user handbook