HP Laserjet 2400 Series
HP LaserJet 2400 Series. (2410, 2420, 2430)
Fast, robust workgroup mono laser printer series with speeds in the 25-35 page per minute range. There are 10 models altogether:
The 2430 is faster - 35ppm tray Tray 1,2 +3, Ethernet, 48MB RAM to 304MB
The "t" models have a 500 sheet tray underneath.
HP literature only tends to mention 7 models, omitting the 2410, 2430, and 2430n for some reason.
The design has proved very succesful and continues to date in the LaserJet P3005 and M3027 MFP.
See the M3027 MFP for a similar engine with a scanner for use as a copier.
All models have a 2 line LCD panel with menu select buttons and LED status lights. Network models have an embedded web server.
Maximum duty cycle recommended as 2420 -75,000 pages per month. 2430 100,000 ppm. As usual with HP duty cycle figures these are much higher than the printer would.
Most models print at around 30 pages per minute. The 2410 is slightly slower at 25 ppm. The speeds cited are HPs figures for letter paper; A4 prints about 1 page per minute slower. Since print-speeds are system and job dependent that scarcely matters.
Print resolution up to 1200x1200 real dpi. HP ProRes 1200 Resolution Enhancement technology (REt)
A4 and letter media sizes. Multifunction tray + 250 sheet tray standard. "T" has extra 500
Tray 1:All models have Tray 1 as a drop-down multifunction tray for media from 3x5 to 8.5x14 inches (76x127 to 215x356 mm). It holds up to 100 sheets
Tray 2:All models have tray 2 as a slide in 250 sheet tray for standard media - A4 or letter.
Tray 3:The LJ 2430 "t" models have an extra 500 sheet tray bringing their total paper capacity to 850 sheets
By default paper output goes to a face-down tray recessed in the parinter top.
An Automatic Duplex unit is present on "D" models.
All models have a 400MHz processor
All models except the LJ 2410 have 48MB built in and are expandble to at least 288MB -sometimes 304MB or 320MB. Memory slots are 2 x 100 pin DDR SDRAM DIMM slots. There are 2 x Compact Flash slots.
Interfaces: All models have a USB 2.0 port and an IEEE 1284-B parallel port and one open EIO port.
Network ready models have the JetDirect Fast Ethernet print server implemented on the formatter board, leaving an EIO slot available for other options.
JetDirect cards recommended are the:
HP PCL 5e, PCL 6, HP PostScript level 3 emulation.
Interfaces: All models have a USB 2.0 port and an IEEE 1284-B parallel port and one open EIO port.
Models for 100 to 127VAC and 220 to 240VAC.
Instant on fuser gives first page out in under 10 seconds and saves power. Duplex models help save paper.
Off, 0.4 Watts. Powersave 8.5 Watts. Standby 11 Watts. Printing 625 Watts.
Base model 260x400x425mm
16.3Kkg
Uses a single-piece cartridge with toner, developer, imaging drum and waste receptacle all integrated into one unit.
Q6511A HP Black Cartridge. Yield 6000 pages. Q6511A
Q6511X HP 11X Black Cartridge. Yield 12,000 pages. - Q6511X
Silver Reed SI5001B cartridge for the Laserjet 2410/2420/2430 Q6511A. Black Toner Cartridge (With Chip) SI5001B. Replaces OEM Code Q6511A.
Silver Reed SI5001C for the HP Laserjet 2410/2420/2430 Q6511X. Black Toner Cartridge PLUS (With Chip) SI5001C. Replaces OEM Code Q6511X.
The fuser is a subassembly which adheres dry toner to the page using a combination of heat and pressure
RM1-1535-000 Fuser Assembly 110 Volt - RM1-1535-000 (Normally used in the US)
RM1-1537-050 Fuser Assembly 220 Volt - RM1-1537-050CN, Fits Printers HP LJ 2420/2420d/2420dn/2430/2430n/2430tn/2430dtn
Changing the fuser on this printer is fairly straight forward.
Pictures of the procedure are in the service manual
Spares are readily available for the 2400 series printers at the moment (January 2010)
Repair Kits and Roller
HP Laserjet 2400/2420/2430 Paper Feed Repair Kit (single cassette model). Contains: Tray 1 Separation Pad RC1-0939, 'D' shaped Tray 1 Roller RL1-0568, Tray 2 Separation Pad RM1-1298, Tray 2 Roller RL1-0542
HP Laserjet 2400/2420/2430 Paper Feed Repair Kit (twin cassette model). Contains: Tray 1 Separation Pad RC1-0939, 'D' shaped Tray 1 Roller RL1-0568, 2 x Tray 2 Roller RL1-0542, 2 x Tray 2 Separation Pad RM1-1298
RL1-0568 Tray 1 Pickup Roller for HP 2420 - RL1-0568-000CN
RC1-0939 Tray 1 Separation Pad - RC1-0939-000CN
RL1-0542 Tray 2 Pickup Roller for HP 2420 - RL1-0542-000CN
RB2-6349 Tray 2 Separation Pad (LJ2430) - RB2-6349-000CN
RM1-1481 Paper pickup assembly - Tray 2 paper pickup assembly RM1-1481-020CN
RM1-1298 Separation Pad RM1-1298-000CN
RM1-1508 Transfer Roller for HP 2420 RM1-1508 000CN
Cogs
RM1-1500-000CN Fuser drive side plate assembly. Drive gear assembly and mounting plate for fuser. Located on the right side of printer. Cogs associated with this plate but not included are:
RU5-0377 - 21 tooth gear
RU5-0378 - 20 tooth gear
RU5-0379 - 19 tooth gear
See "Bugs" below for a brief outline of why and how to replace these cogs.
Electronic Components
RM1-1524, Engine Controller - RM1-1524-100CN
Q6507-61005, Network Main Board (LJ2420/2430) - Q6507-61005
Q6508-61005, Main Logicboard Non Network (LJ2420/2430) - Q6508-61005
RM1-1521, Laser Scanner Unit - RM1-1521-030CN
RK2-0573 Cooling fan - Fan FM2 - Located on lower left side of printer RK2-0573-000CN RK2-0571 Cooling fan - Main cooling fan FM1 - Located in lower right front side RK2-0571-000CN
RM1-1519, Control panel assembly - Control panel mounted on top right corner of printer RM1-1519-000CN
Paper Trays
RM1-1486 250 Sheet Cassette Paper Tray for HP Laserjet 2410/ 2420 (Now RM1-1486-090CN was RM1-1486-030CN). This is the pull out cassette that the paper is loaded into. It Does NOT include the paper feed base assembly.
RM1-1553, 500-sheet paper input tray cassette - Optional tray 3 - For HP Laserjet 2400 series printers - Holds Letter, A4, Legal, A5, B5, Executive and 8.5 x 13-inch paper sizes, RM1-1553-060CN
RB2-6474. 500-sheet separation pad. This is the small rectangular rubber pad on front of cassette arm - Not the one on metal lifting plate. RB2-6474-000CN
The LaserJet 2400 has a few faults.
There is a tendency for these printers to turn noisy. For instance there is a nasty noise like a chainsaw that comes from the back of the printer and is clearly related to the fuser. People sometimes change the fuser and the noise may go away, but unfortunately it might return. The noise may even get worse because the problem lies with the cogs.
In practice the problem is to human ears it doesn't seem to do great harm the printer.
The problem seems to be that the fuser drive gear is very close to another that turns in the opposite direction, and the gear teeth can catch one another. HP technical support seem to have recommended adding grease to the gears as a solution.
A practical fix that a lot of engineers have found is to change the angle of the fuser slightly, backing it away by putting a spacer washer in between the fuser screws or round the guide peg on the gear side. (Search for Parts Now "Service Today April 2008, Vol 17, Number 3 HP LaserJet 2400 Grinding Noise" for a brief guide to their theory on what is wrong and how to fix it.)
If the fault is worse and there is gear damage then the drive gears or even the whole "fixing drive side plate assembly" will have to be changed.
The gears are easy: the parts are: RU5-0377 - 21 tooth gear, RU5-0378 - 20 tooth gear, RU5-0379 - 19 tooth gear. They are available as spares and individually changeable. (Note carefully which cog came from which shaft, it is possible to get them the wrong way round.
These mount in a little cluster above the fuser and clip onto their respective shafts. They and the fuser gear are most likely to be worn.
The bottom gear is part of the fixing drive side plate assembly so replacing it is more work.
Remove the side cover, control panel, formatter and the engine control unit (ECU). The power switch link is a pain to reassemble so note how it is connected.
Remove the main drive assembly. Secure the large cog that reamins on the side of the printer with sticky tape since is is difficult to reposition if it falls off.
To remove the fixing drive side plate assembly first take off the tabbed lose gears. The assembly and it's gears are held by 5 screws.
(Liberty Parts have a guide on how to do this> The title is "HP LaserJet 24xx: Gear Noise Solution" and the filename seems to be ta2400gnoise_long.pdf)
Optional trays may still be available for these printers. In January 2010 the distributors were listing trays but only had stock of refurbished units.
250 sheet cassette, replacement for the slide in tray. - RM1-1486-090CN
Q5963A 500 sheet input tray - 100-sheet paper input tray assembly. Optional Tray 3 - For HP Laserjet 2400 series printers - Holds Letter, A4, Legal, A5, B5, Executive and 8.5 x 13-inch paper sizes. Q5963A also known as Q5963-6790 (Discontinued)