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New cooling fan for HP Laserjet 4

Posted on 2004-08-10
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Last Modified: 2013-12-15
People at my deparment are complaining about a very loud cooling fan in a Laserjet 4. Cleaning the fan didn't help. Since the printer is still doing its job we do not want to buy a new one.

My problem is that the current fan (Canon CF92-H202S2D) seems to be out of production so I cannot get its specifications.

What I am looking for is a (more silent) fan with (exactly) the same power as the Canon CF92-H202S2D.

I know this is a critical issue. So please, no suggestion from people that are just guessing because they have some experience cooling pc cases.

Thanks in advance for your help


Michael
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Question by:ladwein
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by:PsiCop
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I think you'll send a lot of time and energy trying to find this, with no guarantee of success.

If I were you, I'd check auction sites (eBay, whatever) for a used HP LaserJet 4 (great printer, I still have one at home, complete with 26 MB of RAM, a JetDirect card and a duplex tray, runs just fine; and no, sorry, I won't part with it) and get that and strip it for parts. You might even find one someone knows doesn't work and is selling specifically so it can be stripped for parts.
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electronic earned 250 total points
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1. You can find almost all parts for all HP/Canon models on this site:
     http://www.printerworks.com/
     Try them...

2. Another solution: you can use any standard sized 12V OEM fan working at 300-500 rpm and above, that has a control line (3rd wire to rpm sensor). Fan generates 2 signal pulses on any revolve and send them on this line (I think, that minimal acceptable parameter lays about 600-700 Hz, but it may be a little higher).
You can experiment with some OEM fans to find one that doesn't generate  "58 Service error".
Thats all, good luck...
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by:ladwein
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@electronic

Thanks for your answer. Someone told me that the cooling fan in a laser printer must not be too strong, because the printer needed a certain amount of heat to function properly.

I found a fan with the following specifications:
35m³/h (20.8cfm), 16dB(A), 12V, 50mA, 0.6W, 1000rpm, 3Pin Board Connector

Could this be a solution?


Michael
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by:electronic
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ladwein!

This may be really good solution. Don't be afraid about over-cooling. The purpose of cooling fan in this kind of printers is to prevent
overheat of formatter (main board) and interface board placed in the right side of the printer. It's not directioned to cool fuser (fixing unit), it also physically can't do it because there are no contact between the fuser unit and the air flow from this fan and fuser is very hot (85-100 C). There are 2 options to prevent fuser overheat: thermistor and thermo-fuse are placed into fuser to control heat conditions.

So, actually you can try it. The only conditions you'll need to pay attention are the RPM of the fan (58 service error issue) and the amount of DISTURBING MECHANICAL NOISE  :))

Good luck...

@electronic
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