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Congratulations Mike Lewis on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
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HP Laserjet 4L Formatter Board
The PCB is fine, just the surface mount parts got fried. I must try and find a working Laserjet 4L and measure the formatter board. I think the the 5L uses the same PCB so there is hope yet. Bob- BobFBurns
- Post #7
- Forum: PC hardware - Peripheral issues
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HP Laserjet 4L Formatter Board
Hi Jakob The previous owner tried to force their laptop power plug into the memory expansion socket and it disappeared in a cloud of smoke!!! The fault rippled through the laptop electronics and caused some component failures in the printer centronics protection circuit. I have removed all...- BobFBurns
- Post #5
- Forum: PC hardware - Peripheral issues
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HP Laserjet 4L Formatter Board
Hi Jakob Thanks for your prompt reply. I located and identified two of the faulty components (dual diodes) because they showed considerable differences in forward and reverse resistance compared to the other six similar components in the Centronics interface. I can guess at the likely type of...- BobFBurns
- Post #3
- Forum: PC hardware - Peripheral issues
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HP Laserjet 4L Formatter Board
Hi All Can anyone point me in the direction of a circuit diagram for the HP 4L formatter board please. Centronics interface has three failed components which cannot easily be identified. Many thanks.- BobFBurns
- Thread
- Replies: 6
- Forum: PC hardware - Peripheral issues
