HP Laserjet 4 printer doesn't turn on

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
I bought this in 1994, has less than 20k prints on it. Having replaced it with a used HP Laserjet 4+ in 2010, it's been sitting idle. Today, the latter printer having issues, I plugged in the HP4 in order to use it while I work on repairing the HP4+, the HP4 didn't turn on, it only made a faint clicking sound about 1/second. Does this mean the PSU died? Is it a straightforward fix if I get a part (e.g. PSU) or is this problematical?

PS I thought at the time I retired it that it might have PSU issues, maybe not. The evidence wasn't clear. However, it would turn on!
 

PottedMeat

Lifer
Apr 17, 2002
12,363
475
126
it's probably bad caps. many of mine in the power supply were leaking and so were some in the assorted logic boards. take out the power supply tray on the bottom right - the tall output caps near the back are probably clearly leaking. mine has ~250k pages, it's electrically fine, i just gave up on it after a bad toner cartridge vomited all over the insides.
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
it's probably bad caps. many of mine in the power supply were leaking and so were some in the assorted logic boards. take out the power supply tray on the bottom right - the tall output caps near the back are probably clearly leaking. mine has ~250k pages, it's electrically fine, i just gave up on it after a bad toner cartridge vomited all over the insides.
This printer has less than 20k prints, I believe. However it is over 20 years old.

I have the service manual, guess I could look at the caps, at least in the PSU. The PSU's don't appear to be too expensive, maybe I could replace, but as you say, other components could be failing. Meantime, I figure I'll try to fix my HP4M+. It seems OK except for the blank display. I ordered a formatter PCA yesterday. If that doesn't fix it I figure I'll order a control panel. :| The HP4M+ also has around 20k prints, but of course it's an old machine as well. I bought the first one almost new (had around 20 prints on it), but the + machine I found on the sidewalk. I cleaned it up (looked like it had been sitting in a garage for a few years, got it working good, have been using it for ~5 years, but suddenly this blank display issue.
Easiest fix: Spend $50 on a Brother to replace it.
Thing is I love the quality of the prints these Laserjets put out. They are also very cheap to run and very reliable, and parts are cheap now. However, as they age the reliability fades, perhaps exponentially. :eek:
 
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wirelessenabled

Platinum Member
Feb 5, 2001
2,191
41
91
Still running a HP4M+ that I purchased in 1995 or so. Works great still. I had problems over the years with the feed rollers but the last set I put in about 8 years ago have worked perfectly. Only problem is the display is very faint, you can see it but only barely.

Of course it has problems with large .pdf files and is very slow rendering the ones it can print.

Today it is hard to believe that it cost about $1500 when I bought it.
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
Still running a HP4M+ that I purchased in 1995 or so. Works great still. I had problems over the years with the feed rollers but the last set I put in about 8 years ago have worked perfectly. Only problem is the display is very faint, you can see it but only barely.

Of course it has problems with large .pdf files and is very slow rendering the ones it can print.

Today it is hard to believe that it cost about $1500 when I bought it.
Yeah, they cost a pretty penny back then. I paid about $1600 for my HP4, and that wasn't even retail. I got it off a listing in the newspaper for a barely used printer. It had around 20 prints on it. The seller was a very tech savvy guy who decided it wasn't for him for some reason. I went right out and bought the postscript module for it, something like $250-300 IIRC! I had aspirations to start a career in desktop publishing, had taken instruction in Pagemaker at local night school. I still use that program regularly, it runs on 32 bit systems.

I've never replaced the rollers on either of my Laserjet machines. Between them I'm not sure there are over 40,000 prints!

If your display gets so dim that you can't discern what it says I suppose you need another control panel, possibly the formatter, I don't know. I actually have an extra formatter right now. My replacement used control panel for the HP4M+ came in the mail a couple days ago. I haven't put in in yet, been busy. I hope it will bring back the display. It prints right now but at any time, of course, it could have a problem and I wouldn't be able to see the error code... an impossible situation. I hope to get it working OK before I get an error code!

I get the same problems printing PDFs. I can suggest one thing -- don't use the postscript driver, use the PCL driver. I've stopped using the postscript driver altogether the last year or so. I don't remember seeing improved printing using that driver anyway, and I've found the PCL driver to be incredibly faster in a lot of circumstances.
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
Still running a HP4M+ that I purchased in 1995 or so. Works great still. I had problems over the years with the feed rollers but the last set I put in about 8 years ago have worked perfectly. Only problem is the display is very faint, you can see it but only barely.

Of course it has problems with large .pdf files and is very slow rendering the ones it can print.

Today it is hard to believe that it cost about $1500 when I bought it.

I just found the perfect page to help you with the faint display problem... I'm going to employ the same fix and expect it will very much brighten up mine. I installed a used control panel in my HP4M+ yesterday, and the display works but it's rather dim. The following page is a discussion at fixyourownprinter that directly and rather thoroughly addresses how you fix this problem:

HP Laserjet 4 Plus LED display dim
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
it's probably bad caps. many of mine in the power supply were leaking and so were some in the assorted logic boards. take out the power supply tray on the bottom right - the tall output caps near the back are probably clearly leaking. mine has ~250k pages, it's electrically fine, i just gave up on it after a bad toner cartridge vomited all over the insides.
I got the power supply out just now, got the cover off and yes, I see clear evidence of leaking and it's near those two tall capacitors.

Can I replace those capacitors? Did you? Or should I shop around for a replacement PSU? Is it likely those two tall side-by-side capacitors are the source of the leakage?
 

PottedMeat

Lifer
Apr 17, 2002
12,363
475
126
Yeah it's those two - at least. I pulled all the boards and checked for leakage under the large caps, there were quite a few. I made a text file with a complete list of the parts a long time ago but I can't find it. I'm trying to figure out what they were from my digikey order.

I believe these are the ones I replaced on the power board alone:
2 2 P14446-ND
EEU-FR1V122 CAP ALUM 1200UF 20% 35V RADIAL C200 C203 0 1.18000 $2.36
3 1 1189-1064-ND
10YXG470MEFC8X11.5 CAP ALUM 470UF 20% 10V RADIAL C206 0 0.40000 $0.40
4 1 P14441-ND
EEU-FR1V471 CAP ALUM 470UF 20% 35V RADIAL C205 0 0.71000 $0.71
5 1 P15317CT-ND
EEU-FR1A102LB CAP ALUM 1000UF 20% 10V RADIAL C204 0 0.84000 $0.84

bold labels are what they are labeled on the board itself.
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
Yeah it's those two - at least. I pulled all the boards and checked for leakage under the large caps, there were quite a few. I made a text file with a complete list of the parts a long time ago but I can't find it. I'm trying to figure out what they were from my digikey order.

I believe these are the ones I replaced on the power board alone:


bold labels are what they are labeled on the board itself.
Ah. I didn't notice it at first, but looking closely I saw a lot of wetness on the power supply curcuit board (using a flashlight). I figured that was fluid leaking out of capacitor(s). Which capacitors? I could not be certain. I figured there was a good chance it was those two tall 1200uf 35v capacitors. So, I took my 25w solder iron, after removing enough screws where I could get at the bottom of the board and removed those two capacitors and brought them to my local indy electronics supply store and bought a couple of replacements. They are 1500uf, they didn't have 1200uf, but was assured they would work fine, although they are about 3/16" taller. The pair cost me $4.60 including tax. I have them at about a 45 degree angle to make sure the cover would fit. I swabbed up most of the wetness with Q-tips and put the PSU back together and reassembled the printer, plugged it in and turned it on. Alas, the problem remains.

Funny thing is before I did this, before removing the PSU, I tried turning the machine on again in the off chance I'd get a different response. I'll be damned if it didn't look like it was starting normally! It lit up for the first time since I had put it aside 5 years ago, said it was doing the SELF TEST, but after maybe 5 seconds the three round lights started blinking, the machine's engine was basically hiccuping and after maybe 5-10 more seconds the machine lapsed back into silence with a little hiccup about once/second.

Trying again, I got this same sequence once or twice. After that I only got the one/second soft hiccup response. Then I removed the PSU and replaced those two tall capacitors. To my chagrin, all I get now is the soft hiccup responce one/second.

Do you think the PSU is bad? I saw a thread yesterday where a guy tested the voltage of the PSU. I figure I could do that somehow.

As you indicate, there are other capacitors on the PSU circuit board that I could replace. I don't know which ones I should replace. Just repace the ones you indicate here? :confused:

You say you "pulled all the boards." How many boards are there? The ones I know of are the formatter, the control panel and the PSU.
 
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Muse

Lifer
Jul 11, 2001
39,383
9,258
136
Just recycle it

Yes, I'm considering that. But if it is just a bad PSU, I want to keep it going. I've had this printer since 1994 or so. It's only got about 20k prints on it. Yeah, at this point I have to expect things to fail. Don't know if it's wise to try to save it at this point. I wish I knew with some conviction/certainty what's wrong with it. I do have a working HP4M+ right now, although the LED display is pretty darn dim, it's working (replaced the control panel a couple weeks ago), however I'd like to have a downstairs printer. It would also serve as a backup should my upstairs printer develop an issue.
 

sdifox

No Lifer
Sep 30, 2005
98,126
16,831
126
Yes, I'm considering that. But if it is just a bad PSU, I want to keep it going. I've had this printer since 1994 or so. It's only got about 20k prints on it. Yeah, at this point I have to expect things to fail. Don't know if it's wise to try to save it at this point. I wish I knew with some conviction/certainty what's wrong with it. I do have a working HP4M+ right now, although the LED display is pretty darn dim, it's working (replaced the control panel a couple weeks ago), however I'd like to have a downstairs printer. It would also serve as a backup should my upstairs printer develop an issue.

You have already wasted more time than the 4 is worth.
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
You have already wasted more time than the 4 is worth.
Probably true, but I am not aware of the current offerings. I know I don't want an inkjet. I like quality printing, reliable printing, B&W is OK by me because I figure color's going to be expensive on a per/copy basis and likely not so reliable. I have heard again and again that they just don't make printers as good as the LJ 4 and LJ 4+ anymore.
 

sdifox

No Lifer
Sep 30, 2005
98,126
16,831
126
Probably true, but I am not aware of the current offerings. I know I don't want an inkjet. I like quality printing, reliable printing, B&W is OK by me because I figure color's going to be expensive on a per/copy basis and likely not so reliable. I have heard again and again that they just don't make printers as good as the LJ 4 and LJ 4+ anymore.

I like my brother multifunction. Mine is meant for office duty so it takes high yield toner, 8k page rated :cool: mine is mfc-8480dn, newer model of same printer is a lot cheaper.

http://www.pcmag.com/article2/0,2817,2350061,00.asp
 
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Feb 25, 2011
16,970
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Probably true, but I am not aware of the current offerings. I know I don't want an inkjet. I like quality printing, reliable printing, B&W is OK by me because I figure color's going to be expensive on a per/copy basis and likely not so reliable. I have heard again and again that they just don't make printers as good as the LJ 4 and LJ 4+ anymore.
They don't make them as durable. They make them with about a 5-10 year shelf life, not 20. But everything else - from speed and print quality to power use, footprint, noise, etc., - is better.

But they're also cheap. And when they break, well, toss 'em and get a new one.

Having only 20k prints doesn't matter a lick if the machine is that old. Parts deteriorate. Plastic gets brittle, grease dries out, etc.

Given your low print volume and limited needs (just B&W) the Brother HL-L2370 is probably your best shot. It's the successor to the HL-2270, which replaced the 2170, which replaced the 2070. I've been recommending all of the above for years, owned a couple myself, and nobody's ever been unhappy.

That said, they aren't built like bricks, don't take abuse, and will wear out faster than the HP you have (my 2070 started getting cranky at around 8 years old.) New HPs aren't any better/more durable than the Brothers though. Just more expensive. So play nice, and don't buy a used one - you're just paying money for somebody else's problems. As you've learned - nobody gets rid of a functioning laser printer without a pretty good reason.

They come in a few variations - I would recommend getting a networkable one. Printer interfaces come and go, but Ethernet isn't likely to disappear any time soon.
 
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Muse

Lifer
Jul 11, 2001
39,383
9,258
136
I like my brother multifunction. Mine is meant for office duty so it takes high yield toner, 8k page rated :cool: mine is mfc-8480dn, newer model of same printer is a lot cheaper.

http://www.pcmag.com/article2/0,2817,2350061,00.asp
Thank you for that! :thumbsup: I presume the one you linked is the "newer model." The feature I especially dig is the duplex printing. I have spent a ton of knuckle knarling time eeking duplex jobs out of my Laserjets. I checked out the duplexer and it just wasn't for me. Where I have my LJ4/4+ there's no room for the duplexer and they're expensive even now. I've fed the opposite side through the manual feeder for hundreds and hundreds of pages, :hmm:
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
They don't make them as durable. They make them with about a 5-10 year shelf life, not 20. But everything else - from speed and print quality to power use, footprint, noise, etc., - is better.

But they're also cheap. And when they break, well, toss 'em and get a new one.

Having only 20k prints doesn't matter a lick if the machine is that old. Parts deteriorate. Plastic gets brittle, grease dries out, etc.

Given your low print volume and limited needs (just B&W) the Brother HL-L2370 is probably your best shot. It's the successor to the HL-2270, which replaced the 2170, which replaced the 2070. I've been recommending all of the above for years, owned a couple myself, and nobody's ever been unhappy.

That said, they aren't built like bricks, don't take abuse, and will wear out faster than the HP you have (my 2070 started getting cranky at around 8 years old.) New HPs aren't any better/more durable than the Brothers though. Just more expensive. So play nice, and don't buy a used one - you're just paying money for somebody else's problems. As you've learned - nobody gets rid of a functioning laser printer without a pretty good reason.

They come in a few variations - I would recommend getting a networkable one. Printer interfaces come and go, but Ethernet isn't likely to disappear any time soon.
Hey, Dave... I just saw your post. Thanks for this post, it's right on the issues. I'm going to check that out. I hope it duplexes, I print a lot of manuals and when I do, I almost always duplex them. Duplexing with an LJ4/4+ without the duplexer is a pain in the rear, but I know how to do it and have done a lot of A+ jobs.

What I want in a printer:


A laserjet printer with acceptable durability (yeah, the longer the better, right? Ideally you want a printer that would never wear out, it's like death! :D ) duplexing, cheap toner, ethernet, razor sharp printing, fast even with graphics, quiet, not too big (or heavy), I never thought about quiet, I so seldom print it never occurs to me. Oh, and of course, not too expensive. :cool:

Edit: Just checked Amazon's page for it briefly, will read the review you linked. It duplexes!!! It's ethernet networkable. It's not very expensive. I'm thinking this is for me already! :eek: :thumbsup:

Edit2: Multifunction??? Well, I have a scanner but use it pretty rarely. Much more rarely do I fax. I haven't faxed or received a fax for, jeez, must be a couple of years at least! :eek: My laptops (according to the specs) have built in modems, I have a modem in my current main mid-tower, fax software, I can fax with those, even receive a fax if I set it up to receive. My scanner's serviceable. IOW, I don't need fax/scan built into my printer, I've never had that. I suppose it might be real nice if it works simply and nicely, but I don't flat out need those features. The Brother 2360 has cloud printing. I don't know what that is (color me stupid), but I assume that in practical terms for me that just means wifi printing from my computers that aren't wired into my network, which I do want.

Edit3: Actually your post says Brother HL-L2370, but the link is to the Brother HL-L2360. I'm going to check out and see if there's a newer model. :confused: Hmm... Amazon has no hit for the Brother HL-L2370.

Is the Brother Hl-l2360dw basically just a newer model of the Brother HL-L2340DW Compact Laser Printer, Monochrome, Wireless, Duplex Printing?

The toner cost, well, a quick assessment has me thinking that the prints will be around 2-2.5 cents/print in terms of toner, probably about 5x the toner costs for a Laserjet 4, if this is for real: HP 98A (92298A) Black Original LaserJet Toner Cartridge at Amazon

I have a lot of toner for my Laserjets, two cartridges in the machines and an unopened one on a shelf, it's been over 2 years now, but it's probably still good. If I don't fix my LJ4 and get one of the Brothers I'll probably put it upstairs and put my LJ4+ downstairs under my kitchen table and hook it to the parallel port on my laptop's mini-dock.

Edit4: Hmm, I'm reading reviews of the Brother Hl-l2360dw Laser Printer and the next most-recent reviewer (review title: 2.0 out of 5 stars, Look at the print CLOSELY...you'll most likely return it, dated Oct. 29, 2015) said:
If I didn't care about the print quality of this printer, I could have given it four stars like most people. But in a simple test, just look at the printed text with a magnifying glass and you'll see exactly what I mean. It's absolutely HORRIBLE! I also have an $89 HP LaserJet P1102w and looking at print from it with a magnifying glass makes it looks about 50 times better than the Brother.
This has me concerned!!! It was a comparison such as this between the HP 4P and the HP4 back around 1994 (just using the naked eye) that made my decision between the 4P at ~$800 and the 4 at twice the cost. The 4P's text printing was horrible, just horrible and the 4's was sharp as a tack, very close to glossy magazine quality. I have wondered about the claimed resolutions of printers that I've seen over the years. Wondered if the claims are for real. The quote above has me thinking that they are just plain BS.

That was the next most recent review at Amazon. The most recent is just as harsh in its assessment of the print quality:

1.0 out of 5 stars -- I have three different Brother Model printers in my office and would rate them all excellent but not this model
By Charlotte A. Cooperon November 3, 2015 Verified Purchase
I have ALWAYS used Brother printers. The printing on this one was not sharp right out of the box. I have three different Brother Model printers in my office and would rate them all excellent but not this model.

I guess I'm still in a quandry, unless I can find a replacement printer I feel confident in buying. Maybe I'll keep after trying to fix my Laserjet 4. :confused:
 
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sdifox

No Lifer
Sep 30, 2005
98,126
16,831
126
Thank you for that! :thumbsup: I presume the one you linked is the "newer model." The feature I especially dig is the duplex printing. I have spent a ton of knuckle knarling time eeking duplex jobs out of my Laserjets. I checked out the duplexer and it just wasn't for me. Where I have my LJ4/4+ there's no room for the duplexer and they're expensive even now. I've fed the opposite side through the manual feeder for hundreds and hundreds of pages, :hmm:

No the one I linked is my model xd
 

sdifox

No Lifer
Sep 30, 2005
98,126
16,831
126
Look for ones that take high yield 8k pages toner, them be built for heavy duty cycle.
 
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PottedMeat

Lifer
Apr 17, 2002
12,363
475
126
yeah just replace it. i've been using a ~$60 canon laser for some time now.


the last toner cartridge i bought for the thing was genuine sealed in the bag. but the foam lining that seals in the plastic strip disintegrated long ago and when i pulled it toner dribbled out everywhere.


if you still want to mess with the lj4 - there are 5? boards in mine that had at least one seemingly bad cap (leak or stain on the pcb) each -

the power supply board
scanner assembly
dc controller
paper control
HV power supply assembly

the HP Laserjet 4/5 combined service manual will list the power supply voltages
 

Muse

Lifer
Jul 11, 2001
39,383
9,258
136
Mfc8710dw would be comparable to mine.

As to manual feeding to duplex... Lulz

Load the pages back in the tray and print the even pages in reverse order :biggrin:


http://www.pcmag.com/article2/0,2817,2408914,00.asp
I did this a time or two but too many times something went wrong and I wound up with a ton of pages with the wrong page on the reverse side. I stopped trusting the printer not to mess things up and have ever since fed the reverse side in one at a time through the manual feeder. Thing is, after printing on one side, the sheets are not as easily picked by the printer and I got jams, and they screwed up the job.

Yeah, the MFC8710dw, Amazon says that's the new one. I'll look into it. However, I really don't need much in the way of multifunctionality. I need networking, duplexing, really sharp text, pretty good graphics would be very cool, durability, reasonably cheap toner-cost/page, reasonable speed and hopefully not much in the way of delays.

I figure I'll go to Best Buy and have a look at the Brother Hl-l2360dw Laser Printer, if they have it, or similar. My main concern is the sharpness of text, reasonable graphics. I figure I can probably work around the other issues that people complain about but text sharpness is primary.
 
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Muse

Lifer
Jul 11, 2001
39,383
9,258
136
yeah just replace it. i've been using a ~$60 canon laser for some time now.


the last toner cartridge i bought for the thing was genuine sealed in the bag. but the foam lining that seals in the plastic strip disintegrated long ago and when i pulled it toner dribbled out everywhere.


if you still want to mess with the lj4 - there are 5? boards in mine that had at least one seemingly bad cap (leak or stain on the pcb) each -

the power supply board
scanner assembly
dc controller
paper control
HV power supply assembly


the HP Laserjet 4/5 combined service manual will list the power supply voltages
That's a lot of things to check and service. I think I will have to recycle my old LJ4.

Well, I may have a go at checking the voltages on the board I serviced. I just remove the PSU, plug it in and check with multimeter?
 
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