View and Download HP LaserJet Enterprise 500 MFP M525 troubleshooting manual online. LaserJet Enterprise 500 MFP M525 All in One Printer pdf manual download. Back to Printer/Copier/Fax Repair FAQ Table of Contents. Laser Printers. Note: also see the chapter on Photocopiers as the operation and problems of the two types of. Back to Small Appliances and Power Tools Repair FAQ Table of Contents. Appliance Troubleshooting SAFETY Appliances run on either AC line power or batteries. Back to CD Repair FAQ Table of Contents. CD Player and CDROM Drive Troubleshooting SAFETY While there are far fewer potential dangers involved in servicing a CD or. Check out our DEALS CENTRE! New deals added daily. Get them before they're gone. HP Compaq 6000 Pro Microtower PC is packed with high performance features, is energy efficient and well equipped to go beyond meeting the daily business demands. Electronics, Software & Accessories | Dell Canadanew Flash. Library. Activate( 'http: //i. FFFFFF','8',alternate. Markupb. 64e. 4e. ID_7e. 72. 6b. 94cfc. Printer and Photocopier Troubleshooting and Repair Collection. Well, buying 1. 0 year old hardware and then wanting to depend on it not. As reliable as the LJII/III is, they DO break. T fuser gear, paper pickup roller, pickup. AC power supply, registration assy. It's just that they'll. To replace the lower fan, have a vacuum cleaner with a brush handy (or an air. Remove toner cartridge/drum unit. Close lid, remove all cables. On a LJII, you're looking at steel. LJIII, you're looking at a large plastic tray and you have to. Phillips- head screws to get it off first. On both models: remove any optional memory card(s) by first removing the. This hatch is the one *without* the. Remove any circuit board you find under there: they just. On the back of the printer, remove any optional I/O card (HP Jet. Direct. Appletalk, etc) that may be installed next to the normal Centronics data port. This isn't always *necessary* but when it isn't it just makes things easier. Once again, just remove two screws and pull on the I/O card. Now you can remove the lower pan. Nine Phillips head screws later, lift the. Centronics port cable. Vacuum the pan out - - it will be filled with dust bunnies - - and any dust you. You can now see the lower fan. It's a. squirrel cage design. Remove the short wire harness and the four screws to. Note the position of the small bracket under two of the screws, as. Reassemble in reverse order. One screw on the lower pan does NOT go in the. You can't put it in wrong if the upper half is still assembled. The fan is about $2. Do NOT attempt to. I've tried several times, and no matter what I try. From: Larry Sabo (sabo@storm. I have an HP Laser. Jet II that will just die after a short time. There are no. power lights, not even an error message. If I leave it for a short time it. It is totally random.". Check the daughter board in the PSU at fault. On mine it had deteriorated. Remove it, resolder. It's worked like a charm ever. Problem and solution from: Ken Eckert (eckert@sfu. I have a LJ II that has the following problem. The problem is a dark horizontal band starting at line 1, about 1/2" wide. Repeats down the page at same length as the optical drum. Problem is present only on page 1 of a print job. All other. pages are clean. When the engine is stopped at the beginning of the print. OPC in a band. Band gets. Swapping cartridges has no effect.". The problem turned out to be the chassis wiring harness from the DCA. HV module. There was a bad connection between the HV module. I ended up. extracting and soldering all the crimped pins in the connector. I suspect that. it was probably the HV reset line that was the problem. I found a junked HP Laserjet II which initially jammed pulling in the paper. I have fixed that. It still jams on the output, though. It prints nicely. If I open the back tray, the sheet exits 9. With that tray closed, I get the. I do not detect any rotation of the. When opened, I can roll. I see no obvious gear wear or broken teeth. I also see. deep scratches in the grey fuser, which is probably unrelated. The toner. does not have any fusing problem that I see in a band down the page.". From: Tony Duell (ard@p. I think you've got 2 problems here - the false paper jam with the tray open. Let's look a them in that order. There's only one paper sensor in the SX engine that I know about, and that's. On the PCB at the left side of the fuser there's a slotted. There's also a single. PCB that buffers/amplifies the output from the opto- switch. Q3. 32, I think. This sensor must change state one way (to indicate paper has. You might start by reseating the cable at J2. DC controller board. PCB. Silly question: If the paper tray switches (on the DC controller board) aren't. It's always. possible.. Alas I don't know the coding for these 3 switches (SW2. SW2. 03). The other problem is almost certainly mechanical. Look at the gears on the. Shouldn't be too hard to find where the drive has. I suppose you could remove the outer casing and AC block, re- insert. I have an HP IIP that goes through the "0. Self Test" mode but hangs. Warm Up." The only thing I ever hear run is the fan. I am not getting any error codes otherwise. If I try to send a print job. On Line indicators light. Based on what I've read in the FAQ and in the. I'm guessing it is the DC Controller. I re- seated the connections. DC controller PCB and the power supply and everything else. I do not have a service manual for this unit. Can someone tell me how to test the DC controller to see if it is. Any number of simple faults can result in the warmup sequence not completing. Check these first before suspecting a blown power supply or controller. It may indeed be as simple as a burned out bulb or broken door interlock. From: Dave Lee (leedj@uwec. Here is what I found in my notes concerning your very same problem, Hope it. New "Service Today" from Parts Now, volume IV, number 1, issued in. Feb 9. 5 is devoted to the "LX" engine units, IIP/IIP Plus/IIIP Series. Cannon LBP- 4, Apple Personal Laser. Writer. Lots of good stuff, error. Here is what it says. If hung on "0. 2 Warming Up", trouble may be caused by cables on the door. Also look at DC Cnt PCA, dual I/O, formatter PCA. Now. also look at the solenoid for the MP pickup roller assembly. This can. cause the 'hung 0. Warming Up' error if an open occurs in either the. To check, remove the formatter PCA in. DC Controller PCA. Locate J2. 09 on the DC Controller. Measure across the top of these pins, the. Replace the paper path door cable. Part #RG1- 1. 60. From: Jeff Churchvara (jeffc@pond. Experience would have diagnosed this one in about 1. I just. didn't know what I was looking at. I started reading the FAQ and figured the worst. At first, I did not. When I finally did get a. I started checking the voltages and did not have +2. V at the DC. Controller PCA. All of what I was reading said to defeat the door interlock. At first. this didn't make sense to me because the bar that should be attached. I didn't know enough not to look any. Once I realized the bar should've been attached to the door, I started. The screw holding the bar must have. I ended up resetting the nut (threaded sleeve) by adding a screw from. Then I pinched it in place with a second screw when I. This made the bar pull away when the door opened. I forgot the basics of troubleshooting when I posted this one and was. Thanks to all of you who responded and kept me looking in the right. From: Ed Paolo (edpaolo@intac. Check to see if the image of the printout to be, is on the image drum. If it. is there and isn't being transfered to the paper then something like the high. From: FAXFIXR (justdfax@cdepot. There are two corona wires, the charge corona and the transfer corona. The. charge corona is the one you should look at. It is located in the toner. If you don't have another, then you can. If you look at the cartridge in it's operating position, there. The mylar covers the corona wire but allows you to insert the little green. If the tool is there. If you hear a. slight screeching sound (like a violin) then the corona is there. If it's. not there, then the cartridge must be replaced. From: Tony Duell (ard@p. The following was written for HP Laser. Jet III but it is generally applicable. For starters, try a new toner cartridge. I've found these can cause. Now, blank pages are due to one or more of . The drum is not getting exposed by the laser. The EHT power supply isn't transferring toner onto the drum. The EHT power supply isn't transferring toner from the drum to the page. Start it printing a test page (the 'engine test' switch on the DC. When the paper is still going through the. Is there a 'latent image' on the drum? If so, check the. EHT power supply and transfer corona assemblies. Check that you plugged the cables into the scanner properly. They don't. always make good contact. This will normally cause a 'beam detect'. I forget what the error is for that (5. It's possible. that there's an O/C in the cable, of course. If you have an IR detector (of the type used for testing remote. DC controller and point the. IR detector. Again print a test page. If the laser and scanner. IR (laser light, so take care) out of the. There is a mechanical shutter in front of the laser in the scanner that's. The idea is to prevent any laser light getting out if. Is this working. correctly. Did you get the scanner correctly on top of it. From: Andreas Mohr (a. My (donated) Laserjet II series printed black horizontal lines after about. It then occasionally spit out "error 4. The ball bearings of the scanner unit were defective (now I know that my. MUCH louder than other HP 2s). That caused the scanner unit to get "out of sync" and print black lines and. I just replaced the ball bearings and everything was fine again. As far as I know, no Laserjet error codes service page mentions this yet. They only say that "the scanner unit may be defective", but not HOW that. From: Andreas Schumm.). There's a Web page that has photos and a description of the disassembly. See. Repairing the HP. Laser. Jet Series II power supply. As you'll find out reading below, many different failures can result in. Web. page found is the same as your problem! From: Peter Strezev (jup. I had a Laser. Jet series II with exactly the same symptoms: 5. SERVICE and. that very clicking sound. I fixed that printer last week after quite a bit of. First: the clicking sound comes from a mechanical relay in the PSU, which. SCR solid- state relay, the sequence in which. The sound itself is not a. You probably have a bad thermistor in the fuser. If you are good with electronic troubleshooting, try the following. Remove the fuser assembly from the printer. Locate a 7- pin connector on the. I am assuming the same orientation, in which it. Turn the fuser upside down, so that the. Using an ohmmeter, measure the resistance between. The meter should read a. KOhms (if you take off the plastic cover, which covers the. The resistance should come down to a few K Ohms or. OK). If you got correct readings, measure the resistance between the. It should be quite high, about a M ohm. In my case. I found only 3.
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