Error 53

HP LASER PRINTERS 2, 2D
1. Accessory memory failure.

HP LASER PRINTERS 3, 3D
1. Failure in front memory slot. (error 53.1)
2. Failure in rear memory slot. (error 53.2)

HP LASER PRINTERS 2P, 2P+, 3P
1. Replace top memory card.
2. Replace bottom memory card.

HP LASER PRINTERS 3SI, 4SI
1. Temporary error.
2. Laser malfunction.

HP LASER PRINTERS 4, 4+, 4P, 4SI, 4V, 5
1. SIMM malfunction.

HP LASER PRINTERS 4L, 5L
1. An error has been found in the RAM.
2. Defective or incompatible memory card.
3. Defective formatter pca.

HP LASER PRINTERS 5P, 5SI
1. SIMM malfunction.

HP LASER PRINTERS 1200, 2200, 3100, 3200, 4100
1. Temporary error. 
2. Replace formatter.
3. DIMM error.

HP LASER PRINTER 4500
1. Temporary error.
2. DIMM error.

HP LASER PRINTER 8500 
1. Temporary error. 
2. DIMM error.

HP LASER PRINTER 9000
1. Temporary error. 
2. DIMM error. 
3. Replace formatter. 

Error 54

HP LASER PRINTER 2D, 3D 
1. Improperly fitted duplex shift plate. 
2. Bad PS5 or SL4. 
3. Main motor defect.

HP LASER PRINTER 5SI 
1. Defective duplexer. 

HP LASER PRINTERS 1200, 2200, 3100, 3200, 4100
1. Temporary error. 
2. Replace formatter.
3. Remove tab from toner cartridge and replace. 
4. Try another wall outlet.

HP LASER PRINTER 4500 
1. Toner cartridge has been incorrectly installed. 
2. Carousel rotation failure. 
3. Internal power failure. 
4. Density sensor error. 
5. Waste toner sensor malfunction. 

HP LASER PRINTER 8500 
1. Temporary error. 
2. Carousel rotation failure. 
3. Toner cartridge has been incorrectly installed.
4. Waste toner sensor error.