hi boys and girls,
here is a link to web based training for HP products
and from here you can get the service manual for the CLJ3800
Now to my problem: it's a hard nut to crack !
I had to replace 3 (from 4) lock levers (part no. RC1-6640-020CN) for the colour cartridges on the right hand side after a user had "only" changed one of the toner cartridges.
This involved removing the print cartridge drive assembly in front of the developing separation-drive assembly.
When I was putting everything back together again, I noticed that the gears driving the channel-shaped rods (rods are visible in fig 5-53 of the service manual) which press the print cartridges against the paper have markings on them. Two had half fallen out when I dismantled the printer. You can see the gear for the black cartridge in the fig. below fig. 5-49, it's the larger one on the left hand side of the fig. If you enlarge this picture you can see 2 of the 4 markings on the gear. The smaller gear above this drives it and is in turn driven from the developing separation-drive assembly. This smaller gear stays with the print cartridge drive assembly and the larger gear remains in the chassis when the print cartridge drive assembly is removed.
Below these is the drive gear for the upper (yellow) print cartridge. The set up here is the same as that for the black cartridge.
When the print cartridge drive assembly is removed then you see the 4 identical gears on the channel-shaped rods above each other, set slightly sloping. There are then 2 smaller gears which interlock the gears for the yellow and cyan rods, and then the cyan and the magenta rods. i.e. if we number the gears from top to bottom :
#1 - large gear attached to channel-shaped rod for black cartridge
#2 - large gear attached to channel-shaped rod for yellow cartridge
#3 - smaller gear drives gear #4 from #2
#4 - large gear attached to channel-shaped rod for cyan cartridge
#5 - smaller gear drives gear #6 from #4
#6 - large gear attached to channel-shaped rod for magenta cartridge
Gears #3 and #5 are, like the upper drive gear, callout 7 in fig 5-49, are not captive, these are the ones which half fell out.
There are 2 arrowheads on the chassis, above gears #1 and #2, so I lined up one of the markings on gears #1 and #2 with these. This puts another marking (a dot) roughly opposite (maybe 170° from the first). When one of the dot markings on gear #3 (which, like gear #5, has 2 dot markings about 80° from each other) is lined up with this dot marking on gear #2, then the other dot marking can be lined up with the dot marking on gear #4. This puts gear #4, for channel-shaped rod for cyan cartridge, in the same position as gear #2. The same goes for gears #5 and #6.
So everything sounded logical, all the larger gears were in the same position, the markings were lined up (the right ones?), the channel-shaped rods were in the same position - but please note: the cams on the rods are in different positions (as seen in fig. 5-53). I put this down to the print cartridges not being vertically lined up, but staggered.
When I powered up, no error messages (whew !!!)
When I tried to print config pages, supplies status page , test page, etc
SHHHEEEEEETTTTT !!!
The first quarter of the page is a blur, then the cyan comes up, on the second page the cyan+magenta background at the top of the page is there.
When I print the 4 PCL Script Types pages, the first 1/4 of the first page is a blur, then the yellow appears, half way down the red, then the cyan but still no black, on the second page the cyan+magenta background at the top of the page is there and the yellow and the red are there from the top of the page, same for the third page, and right at the bottom of the 4th page the black finally appears.
When I print the test page, the first 1/2 inch is a blur, then the yellow appears, after another 3 inches the cyan appears, then 2 inches later the magenta, and at the bottom of the page the black.
When I print out the 15 or so RGB pages, then all colours are there, although at the very beginning of the first 3 pages, there is a very slight blur.
I have done a full calibration, to no avail.
What I don't understand is that after a couple of pages, things seem to get better, but the first page is always a blur.
The black drive is totally independent of the colour drives - to save wear and tear.
To me it sounds like a timing/synchronisation problem, a search of the service manual for these words yielded nothing.
Were my assumptions about the markings on the gears correct?
In the service manual, there is no reference to the gears - which I find weak.
Anybody got any ideas?
Sorry that this is so long but I thought that a detailed description is better than not enough info.
here is a link to web based training for HP products
and from here you can get the service manual for the CLJ3800
Now to my problem: it's a hard nut to crack !
I had to replace 3 (from 4) lock levers (part no. RC1-6640-020CN) for the colour cartridges on the right hand side after a user had "only" changed one of the toner cartridges.
This involved removing the print cartridge drive assembly in front of the developing separation-drive assembly.
When I was putting everything back together again, I noticed that the gears driving the channel-shaped rods (rods are visible in fig 5-53 of the service manual) which press the print cartridges against the paper have markings on them. Two had half fallen out when I dismantled the printer. You can see the gear for the black cartridge in the fig. below fig. 5-49, it's the larger one on the left hand side of the fig. If you enlarge this picture you can see 2 of the 4 markings on the gear. The smaller gear above this drives it and is in turn driven from the developing separation-drive assembly. This smaller gear stays with the print cartridge drive assembly and the larger gear remains in the chassis when the print cartridge drive assembly is removed.
Below these is the drive gear for the upper (yellow) print cartridge. The set up here is the same as that for the black cartridge.
When the print cartridge drive assembly is removed then you see the 4 identical gears on the channel-shaped rods above each other, set slightly sloping. There are then 2 smaller gears which interlock the gears for the yellow and cyan rods, and then the cyan and the magenta rods. i.e. if we number the gears from top to bottom :
#1 - large gear attached to channel-shaped rod for black cartridge
#2 - large gear attached to channel-shaped rod for yellow cartridge
#3 - smaller gear drives gear #4 from #2
#4 - large gear attached to channel-shaped rod for cyan cartridge
#5 - smaller gear drives gear #6 from #4
#6 - large gear attached to channel-shaped rod for magenta cartridge
Gears #3 and #5 are, like the upper drive gear, callout 7 in fig 5-49, are not captive, these are the ones which half fell out.
There are 2 arrowheads on the chassis, above gears #1 and #2, so I lined up one of the markings on gears #1 and #2 with these. This puts another marking (a dot) roughly opposite (maybe 170° from the first). When one of the dot markings on gear #3 (which, like gear #5, has 2 dot markings about 80° from each other) is lined up with this dot marking on gear #2, then the other dot marking can be lined up with the dot marking on gear #4. This puts gear #4, for channel-shaped rod for cyan cartridge, in the same position as gear #2. The same goes for gears #5 and #6.
So everything sounded logical, all the larger gears were in the same position, the markings were lined up (the right ones?), the channel-shaped rods were in the same position - but please note: the cams on the rods are in different positions (as seen in fig. 5-53). I put this down to the print cartridges not being vertically lined up, but staggered.
When I powered up, no error messages (whew !!!)
When I tried to print config pages, supplies status page , test page, etc
SHHHEEEEEETTTTT !!!
The first quarter of the page is a blur, then the cyan comes up, on the second page the cyan+magenta background at the top of the page is there.
When I print the 4 PCL Script Types pages, the first 1/4 of the first page is a blur, then the yellow appears, half way down the red, then the cyan but still no black, on the second page the cyan+magenta background at the top of the page is there and the yellow and the red are there from the top of the page, same for the third page, and right at the bottom of the 4th page the black finally appears.
When I print the test page, the first 1/2 inch is a blur, then the yellow appears, after another 3 inches the cyan appears, then 2 inches later the magenta, and at the bottom of the page the black.
When I print out the 15 or so RGB pages, then all colours are there, although at the very beginning of the first 3 pages, there is a very slight blur.
I have done a full calibration, to no avail.
What I don't understand is that after a couple of pages, things seem to get better, but the first page is always a blur.
The black drive is totally independent of the colour drives - to save wear and tear.
To me it sounds like a timing/synchronisation problem, a search of the service manual for these words yielded nothing.
Were my assumptions about the markings on the gears correct?
In the service manual, there is no reference to the gears - which I find weak.
Anybody got any ideas?
Sorry that this is so long but I thought that a detailed description is better than not enough info.
