Question about HP LaserJet 4L Printer
Printer won't do anything the lights don't even come on.
Your problem most likely is in the switchmode power supply section of the DC Controller board. What typically happens here is that the field effect transistor (FET) which is Q201 will fail. If you are an electronic technician and want to download a service manual, you probably can fix this. I just repaired my Laserjet 4L, and ordered the 2SK1351 transistor from littlediode.com in the UK. I ordered it from them because of the price and the fact that the next best price was 8.88 from MCM Electronics, but they are out of stock until June 21,2010. This FET has switched on and off many times, handled varing amount of current up to 4 amps, and is mounted on a heat sink in the 15 plus years since it was made. It therefore has dealt with a lot of heat, which can make a transistor eventually fail. I hope that this helps!!
Posted on May 25, 2010
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Posted on Jan 02, 2017
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