Laserjet 4 Toner Cartridge

HP LaserJet 4 - Anal Speculum - gifts& health care products

Common problems
The EX (and EX+) print engine is known for its reliability and longevity, and in comparison to earlier generations of laser printers, these machines have acquired a 'workhorse' reputation. The engine has a high monthly duty cycle (20, 000 pages) and it is not uncommon to find units still functioning well after a million or more page impressions. However, any printer mechanism is subject to wear and degeneration, and typically printers still in use have now seen long service (the machine being discontinued with the introduction of the Laserjet 5 in 1996).
Exit path jams
Printers that exhibit the "accordion" or "washboard" paper jam problem with the paper tightly concertina'd or folded in the exit paper path (often behind the rear access door) generally have problems with the paper exit mechanism. In many cases, the delivery rollers (upper and lower) in the upper or final stage of the paper exit are worn or unserviceable. Replacement kits for these rollers are easily obtainable and can solve the problem.
Models
4/4M
Introduced in 1992, this is the original LaserJet 4. It prints eight pages per minute, and the user cannot exend the feeders.
4+/4M+
The LaserJet 4 Plus (4+), released in 1994, was the LaserJet 4 with the improved Canon EX+ engine which increased printing speed to 12 PPM. This also provided the option for duplex printing (automatic double-sided printing) with the purchase of an accessory. The original 20MHz processor was also upgraded to 25MHz, with the addition of Hewlett Packard's Memory Enhancement Technology. The printing mechanism was also improved to allow increased tones of grayscale.
These models also feature a 20-30W power saving (stand-by) mode, which was not included in the original Laserjet 4.
4Si
The 4Si (and 4Si MX for the Macintosh) were heavy-duty business printers, produced using the Canon NX engine. The 4Si worked at 17 PPM, and could be upgraded with a duplexing unit.
4L and 4P
HP LaserJet 4P
The LaserJet 4 series had small printers in the range: the personal-use 4L and the small-business use 4P (and the Macintosh-compatible 4ML and 4MP). These printers both used the Canon PX engine, which like the EX was new at the time of release. The 4L used the 300 DPI PX engine, with the 4P using the upgraded 600 DPI PX-II engine. The 4L was the first LaserJet with power-saving technology which turned off the printer when not in use.
4V
The 4V and 4MV were B-size printers for graphic artists using the Canon BX-II engine. Hewlett Packard did not consider the original BX engine as "good enough" for their LaserJet series. The 4V/4MV were released in 1994 and dominated the market due to their competitive price. The 4V series was the first HP printer to offer an internal hard disk option.
Common Fixes of the LaserJet 4V and 4MV model can have accordion jam as well, caused either by a worn roller or broken tooth on the gear at the fuser door, this can be repaired by replacement of the front fuser door, the engine over all is reliable, problems such as paper jams can be fixed by replacement of pickup rollers located under the toner cartridge, replacement of the fuser door, checking if the paper separation paws are not bent and replacement of the delivery rollers.
4LC and 4LJ Pro
The 4LC and 4LJ Pro were printers based on the 4L platform modified for the Chinese and Japanese markets respectively. The 4LC was the "first printer designed exclusively for the Chinese market", and was released by HP in April 1995. This was followed by the Japanese 4LJ Pro in May 1995. Both of these printers used a 2 byte PCL that had been recently developed for Asian fonts, and came with memory upgrades and Chinese/Japanese fonts. Both printers worked at 600 DPI, with 2MB RAM.
Macintosh variants
In all the models of the four series an 'M' designation identifies a version designed to work well with the Apple Macintosh, with additional accessories for network connectivity (JetDirect (Ethernet)/LocalTalk), PostScript Level 2 support and more memory, built-in as standard.
Comparison
Comparison table of HP LaserJet 4 models
Model
Introduction
Canon print engine
Print resolution (DPI)
Print speed (PPM)
Standard memory (RAM in MB)
Maximum memory (RAM in MB)
4 (4M)
October 1992
EX
600
8
2 (6)
34 (26)
4Si (4Si MX)
April 1993
NX
600
17
2
34
4L (4ML)
May 1993
PX
300
4
1 (2)
2 (2)
4P (4MP)
October 1993
PX-II
600
4
2 (6)
26 (22)
4+ (4M+)
May 1994
EX+
600
12
2 (6)
66 (50)
4V (4MV)
September 1994
BX-II
600
16
4 (12)
68 (52)
4LC/4LJ Pro
April/May 1995
?
600
?
2
?
See also
PC Load Letter
HP LaserJet 5
Further reading
Compute! Magazine - 1993 review of the HP LaserJet 4
Frequently Asked Questions about the HP Laserjet 4
References
a b c Google Groups - 1993 Usenet thread on printing engines in LaserJet 4 series (Accessed June 14, 2006)
a b c Printer Works - BX Engine (Accessed June 14, 2006)
Printer Works - LaserJet 4 Information (Accessed June 14, 2006)
Windows Magazine - Top 100 best products of 1995 (Accessed June 14 [, unavailable Sep 2009])
a b c d e f Twenty Years of Innovation: HP LaserJet and Inkjet Printers 19842004 (PDF) (Accessed June 15, 2006, unavailable Feb 2009)
Printer Works - 4Si (Accessed June 14, 2006)
Printer Works - PX Engine (Accessed June 14, 2006)
Printer Works - 4L (Accessed June 14, 2006)
Printer Works - 4P (Accessed June 14, 2006)
Printer Works - 4V (Accessed June 14, 2006)
HP LaserJet 4M Plus details (Accessed June 14, 2006)
Resolution is given in dots per inch (DPI)
Print speed is given in pages per minute (PPM)
a b c d HP Support - LaserJet 4 model comparison (Accessed June 30, 2006)
a b HP LaserJet 4L, 5L, 6L Printers - Comparison (Accessed March 5, 2009)
a b c (in English) Laserjet 4V and 4MV Printer User's Manual (First ed.). Hewlett Packard Company. 10 1994.
Categories: HP LaserJet printers

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