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HP LASER ERROR CODE 12 – OPEN OR NO EP
ALL HP LASER PRINTERS
1. Paper path door or top cover open.
2.
Toner cartridges missing.
3. Toner cartridge not seated in printer
4. External fuser access door not closed.
5.
Tab missing on top cover.
6.
Bad D.C. controller
HP LASER PRINTER 3SI, 4SI
1. PS1 malfunction. Check the PS1 is blocked by the latch fan
2. Fuser bulb burned out.
3. Bad D.C. controller
HP LASER PRINTER 4, 4+, 5
1. Plunger missing on top cover.
2. Paper control P.C.A. malfunction.
3.
Bad top cover switch.
HP LASER PRINTER 4V
1. Front door open sensor.
2. Toner cartridge micro switch malfunction.
3. DC controller PCA malfunction.
HP LASER PRINTER 2P, 2P+, 3P4P
1. Printer door open.
2. D.C. power supply malfunction.
3. Replace D.C. power supply.
4. External Fuser Door Open.
5.
Defective Fan 6.
Sensor switch for the door is dirty or needs to replace. 7.
Bad high voltage power supply.
HP LASER PRINTER 4P, 5P
1. Top cover open.
2. No toner cartridge. 3.
Bad toner cartridge.
3. Defective interlock switch assembly.
4.
Bad D.C. controller
HP LASER PRINTER 4L
1. Part of the top door that pushes the plunger down is Broken.
2. Top door switch is broken.
3.
No toner cartridge
4.
Bad toner cartridge 5.
Bad D.C. controller
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