Question about IBM Infoprint Color 1464 Laser Printer
The printer says its performing ITU maintance and then changes to say 100 ITU error.
Have you recently replaced the ITU? If it is saying ITU Maintenance, then the kit needs to be replaced. If you have already purchased and installed a kit, the reason this error is coming up is because the second transfer roll (small roller under the ITU) is not installed properly. Otherwise, you should purchase and install a new ITU maintenance kit.
Posted on Jul 24, 2009
I have found and fixed the cause of the 100.01 service ITU error. If when looking at the ITU mylar belt, it is riding off to one side and not centered on the rollers, this fix will work for you. The belt has a reflective sensor which passes an optical sensor with every pass, which delivers a pulse to the processor. This pulsing is what tells the processor that the itu belt is rotating. The loss of this pulse (caused by misalignment of the belt) is what generates the 100.01 service error. The cause I've found is a slow build up of toner dust that accumulates on one side of one or multiple rollers beneath the belt. This build up increases the circumference of the roller and pulls the belt off to that side, which in turn pulls the reflective mark beyond the limits of the optical sensor.
This is a pretty intricate process and requires the hands of a second person to accomplish, but with patience and attention to detail, you can restore proper operation to your image transfer unit (ITU). The unit must be disassembledA few warnings and cautions first. you'll need to lay all screws out logically and ordered the way they were removed from your ITU. It would not be a bad idea to take some close up and well lit pictures of several sides and angles of the itu before disassembly. Second, the wide ITU belt is very delicate, and must be handled as such. Any sharp kinks or bends in the mylar belt can transfer over onto your print image so be very careful with the belt. Start by unplugging the two sensor cables which are connected to the long half of the itu. The short swinging portion which the wires were connected to is connected at the pivot point by a chrome rod. There as a small plastic tab which catches a recess in the rod. gently raise the tab with a jewlers screwdriver until the rod slides past the recess and then slide the rod out. This recess will later serve as an alignment point for reinserting the rod. It is easier if you slide this rod out and seperate the smaller half from the belted half. There is also a plastic guide plate sharing this pivot point which can be carefully popped out of the lower mounting holes. Set this piece, the rod, and the upper sensor assembly to the side for reinstallation later.
Next you'll need to remove the base plate from the belted half.Looking at the narrow end of the belted assembly, you'll see two screws going in the side and two from below. Remove the two side screws holding the base in place, and remove the two lower screws and the end gaurd (metal pieces) should come off. set these along with the four screws aside keeping them grouped together. Now remove the Spring loaded) lower plate by sliding it forward enough to clear the tabs and lower it from the assebly. This plate has enough tension that can be tricky to remove. Just keep in mind the mylar belt must not be scratched, kinked or otherwise damaged or this will all be wasted time! Once the plate clears the tabs you can actually go back toward the springs with the plate to allow the springs to drop from the oblong holes. Set the plate asside with the two metal latches and four springs as a group. Don't remove the springs from the assembly.
Next remove the waste toner dump/auger mechanism. On the base of the itu is the waste toner dump/auger assembly. It has a foam covered flap on one end to close the auger when the unit is removed from the machine. Looking on the side of the assembly where the wires are hanging out, look for the screw which holds the locking arm for the toner dump assembly. Remove the screw and lock arm. remove the toner auger/dump by sliding out the pinned side first, then out of the opposite side. Set it asside with the locking arm and screw.
Next remove the front belt tension roller springs, two on each side. This can be done with a small flat bladed screw driver. Compress the spring away from the short spring retainer and pop it out the side. The springs are pretty stout, but can be removed from the sides. Two springs per side, and now belt is loose. Set asside arraged logically for reassembly later.
Next set the assembly on it's side, wires facing up. Now closely study the routing of the belt. it must be reinstalled exactly the way it was removed, with reflective tab on the wired (sensor) side of the assembly. There are four machine(fine thread) screws to remove, one coarse thread (sensor) screw to remove, and three e-clip retainers. Remember to lay these out along side logically so you know the reinstall location, as they are not all the same size. I try to orient them all on a towel laid out front to rear in the order they were removed.
Next remove the sensor from the side plate by swinging it down away from screw hole, and the slide tab out of the metal plate. remove wires from plastic guide but pay close attention to the wires route within the assembly so they do not get pinched during reassembly. Leave sensor hanging inside.
Side plate can now be slowly lifted off but watch for the small nylon gear to fall loose which sets over the shorter side plate peg. This gear engages the lower main roller and drives the toner dump auger. Lift off the plate and set it aside with gear on the short pin. now don't panic as all your rollers begin to fall over but of place, that's what the second set of hands are for later!
Next, study the location of the rollers and their respective mating locations in the other plate. remove the rollers one at a time, and clean off any toner accumulations. The three yellowish orange rollers are "floating rollers" and have brown bushings on the lower ends. be careful not to loose bearings from the chrome guide roller. It has mini roller bearings on each end that can slide off. Clean all rollers with acetone, making sure there are no accumulations of toner on any rollers. Once all rollers are clean you ready to reverse the process and reassemble.
During reassembly, there are a few things you may run into. The large roller in rear top position is equipped with a plastic insert that actuates a one way spring clutching mechanism. it is easiest to set this piece on the side panel on it's mount and then set roller with spring tab over it making sure the tab is fitted in between the open sections of the plastic insert. Two of the shafts have a flatside and must be clocked correctly before lowering the plate. The white nylon gear can be wedged back onto it's pin after the plate is remounted, so concentrate on roller pin alignment first. The wide belt must be installed under the two side mylar protective strips. these serve to keep stray toner dust from getting under the belt. There are multiple metal frame supports, and each has an alignment slot. you have to have plenty of patience but it will eventually snap into place.
This process can be done in around 30 minutes, and can save you over $800 for a replacement ITU. It brought mine back from the dead and has been working flawlessly ever since! Good luck, and I will check back periodically if anyone has any questions. I can also, if your situation becomes desperate, provide contact info to assist in your repair. Good luck!
Posted on Sep 05, 2011
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Posted on Jan 02, 2017
Tips for a great answer:
A 100.01 ITU error indicates that the printer did not detect the ITU belt home sensor. Before proceeding with this
service check, make sure that the Second Transfer Roll is correctly installed. After you reinstall the Second
Transfer Roll, check to see if a 100.01 ITU error is still displayed. If a 100.01 ITU error is still being displayed,
continue with this check.
The ITU has an optical sensor that watches for a piece of reflective tape on the inside of the image belt. This
tape is read every revolution of the belt. If a signal is not received from the belt sensor within a certain time
period, the printer posts an error due to the loss of signal. There are several causes for the loss of signal. First,
the belt has tracked too far to the front or rear of the printer. In this case, the belt is still turning, but the reflective
tape is no longer passing within view of the belt sensor. This is considered a belt tracking error and is initially
posted as a 100.02 ITU Error. The other causes of a signal loss could be a belt stall, meaning the belt is not
turning, or a true signal loss, which would be due to a bad sensor, broken cable, loose connection, or bad
system board. These other causes post as a 100.01 ITU Error.
To assist the printer in determining the cause of a signal loss, there is a buffer that records the belt position for
the last 50 revolutions. If the printer loses the belt signal, it refers to the buffer. If the buffer shows significant
mistracking before signal loss, it will post a 100.02 ITU Error. If the buffer shows that the belt has been tracking
in the center before signal loss, it posts a 100.01 ITU Error. Due to memory restrictions, the buffer is not saved
during POR. This means if a printer posts a 100.02 ITU Error, so the belt is tracked off, and the customer or
servicer turns off the printer to clear the error, when the printer starts up, it will still not see the belt signal and will
now post a 100.01 ITU Error because the buffer is empty. When servicing a printer for a 100.01 ITU Error, it is
important to view the error log. See "Display Log" on page 3-29. The error log can only be displayed at this
point. Do not try to print the log. Look for past occurrences of 100.01 ITU Errors preceded by a 100.02 ITU Error.
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