HP LaserJet 4 Service Manual - Page 90

Caution When removing a board from the antistatic package, avoid touching the metal traces on the SIMM board. For memory boards, compare the part number on the outside of the package to the part number in the table below. If you have not received the correct board, notify your authorized Hewlett-Packard dealer immediately. Table 3-13 SIMM boards Part Number HP LaserJet 4/4M C2063A C2064A C2065A C2066A HP LaserJet 4+/4M+/5/5M/5N C 3130A C3131A C 3132A C 3133A C 3146A Size One MB Two MB Four MB Eight MB Size One MB Two MB Four MB Eight MB Sixteen MB The LaserJet 4 Plus Optional Memory (C3130A, C3131A, C3132A, C3133A, or C3146A) is not compatible with the HP LaserJet 4. If the LaserJet 4 Plus Optional Memory is installed in the LaserJet 4, the printer will display a "53.1X.08 ERROR" (X indicates the position of the SIMMs slot). 3-54 Configuration