HP color laserJet 4550 series - Theory of Operation

C7085-90921 Chapter 4 Printer maintenance 99
Figure 4-5 Do not remove the DIMM in slot #4.
Figure 4-6 Do not remove the DIMM in slot #3.
CAUTION The HP Color LaserJet 4500 printer uses 100-pin, non-parity, synchronous SDRAM DIMMs. The HP
Color LaserJet 4550 printer uses 168-pin, non-parity, synchronous DRAM DIMMs; EDO DIMMs are
not supported in either the HP Color LaserJet 4500 printer or the 4550 printer. To ensure you are using
the correct DIMM, see figure 4-7.
Figure 4-7 EDO and SDRAM memory modules
EDO SDRAM