HP LaserJet printer repair

Post Reply New Topic

anyone ever done it.

Which one? I have on the 1320, 4000, 4050 and 5000.

What problem? Troubleshooting comes first.

I have done repairs since 2001 starting with the LaserJet series II and III, I have worked on most models made in 1987 - 2007. over a 10 year period.
I keep up with industry news from Parts Now! LLC.

By 2015-2019 pages per minute will increase up too 120 - 200+ ppm, over next few years standlone printers will be replaced by Multifunctionals this is already happening, recently a new day hospital has opened in my town, mostly every department has a multifuctional system, mutifuction systems is going to completely replace standalone printers in the next couple of years, by 2017 multifunction printers will completely replace standalones, and laser printing be replaced by LED based printers.

History:

Since the early 90s, laser printers became networked starting with the LaserJet IIISi "1991" these printers were built for high volume printing, these were 17 pages per minute machines, by the end of the 90s machines "LaserJet 4000" in 1997 at mid level were the same speed and capacity but with a higher resoultion 1200DPI apposed to the 300DPI of the IIISi.

During the 2000s, laserjets reached up to 55ppm by the end of 2008. "P4515", now we are in the 2010s what does this decade hold for future models, I would say the speed will double every 5 years. appose to the first LaserJet 8ppm in 1984, as we apporach the 30th Anniversary of the first HP LaserJet and HP ThinkJet, from 1984 to 1994 the first 10 years of the line, we had 8ppm to 17ppm, this is slow by todays standards but its still impressive.

Analogue Copier machines back in the 70s of the high volume Xeroxes were about 120ppm, very impressive by todays standards.

[youtube]http://www.youtube.com/watch?v=_IgH2M02xek[/youtube]

Multifunctional systems take longer to repair, due to taking off addtional componets to access the printing engine.

The higher the speed the more the problems with gear assemblies, due to the high speeds.

Laser printing would convert to LED instead, this is already happening in late model Fuji Xerox Document Centers.

I'm constantly traning on the newer models.

Currently I'm using a LaserJet 4300DTNS, Xerox DocuCenter C400, Color LaserJet 1600, 5500DTN, P3005DN just mainly to learn each model.

[youtube]http://www.youtube.com/watch?v=ZBt6gSGRZ-Y[/youtube]
The old 914 back in the early 1960s.

Did Laserjet repairs from 91-2008, from the Laserjet I (heavy @#$%, and the internals would slice you up if you didn't lift the top half off correctly), didn't get much past the LJ3800s, 4700s, etc, but I fixed hundreds of them (was 'the printer guy' until the found someone who would do it for 9$/hr...

Whaddaya need to know?

If that's a 4300, it looks something like the 4250 (probably a safe bet... I'd check the pickup rollers, maybe the toner cartridge (I've seen that happen. If you have access to another one, just pop it in for a page or two for comparison)

The path is pickup rollers, into the toner area, then out the top. Time how long it takes to get to the squeak; half of printer repair is timing anyway...

Another thing is to listen to the squeak...how long it lasts (depends on the gears and how long they have to turn). If it's a short series of squeaks, it would possibly be smaller rollers. If you listen close, you can listen to the paper actually go through the printer, and interrupt it where it starts whining...

Unless they've changed it, I think you might be able to download service manuals, but it's been a while. I used to get them when I did training. I don't have the 4300, but I had the 4250 and 4200 (and 4150 and 4100 and...you get the picture...

Working on the Laserjet I didn't have to do that much. Sliced myself a good one on the Apple version (the Canon engine was used for both) in training class. It was 1 tray, a monster toner cart, and about 50% of the body was above the hinge, so you couldn't open it that fast...

Hope this helps

I have worked on this 4300, I turned it back on after I returned to home from church and made a knocking noises for a second then, works normal, turned it on and off and back on the noise is not there, don't know what caused it.

I just about have PDF copies of most service manuals and hard copy printouts of some of the most common.

Configuration Page

Device Information

Product Name: hp LaserJet 4300
Printer Name: hp LaserJet 4300
Printer Model: Q2433A
Printer Serial Number: SG****0721
Firmware Datecode: 20050602 04.020.3
Service ID: 00000
PS Wait Time-out: 300 seconds
Page Count 195924
Preventive Maintenance Interval: 200000
Pages Since Last Maintenance: 30087

Installed Personalities and Options

PCL (20010402)
PCLXL (20010402)
POSTSCRIPT (20010402)
DIMM Slot 1: Side 1: 8 MB Flash
Side 2: 64 MB SDRAM
DIMM Slot 2: Side 1: 16 MB SDRAM
Side 2: Empty
DIMM Slot 3: Empty
DIMM Slot 4: Side 1: 64 MB SDRAM
Side 2: 64 MB SDRAM
EIO1: HP J6054A
EIO2: HP JetDirect J7934G
DISK Storage: 4641 MB Capacity

Memory

Total Memory: 208 MB
DWS: 78.0
Automatic Resource Saving Enabled

Security

Control Panel Lock: NONE
Control Panel Password: DISABLED
Device Type: DISK Write Protect: DISABLED

Paper Trays and Options

Default Paper Size: A4
Tray 1 Size: ANY SIZE
Tray 1 Type: ANY
Tray 2 Size: A4
Tray 2 Type: PLAIN
Tray 3 Size: A4
Tray 3 Type: PLAIN
Tray 4 Size: A4
Tray 4 Type: PLAIN
Duplex Unit

Internal:
Input Trays:
1: TRAY 1, 100 Sheets
2: TRAY 2, 500 Sheets
3: TRAY 3, 500 Sheets
4: TRAY 4, 500 Sheets
Output Bins:
1: STANDARD_OUTPUT, 250 Sheets, Face Down

Device1:
Output Bins:
1: OPTIONAL_BIN_1, 500 Sheets, , Finishing Device