HP 4550 Service Manual - Page 100

DIMM configuration Note Note You can add additional Random Access Memory (RAM) to this printer by installing Dual Inline Memory Modules (DIMMs). The HP Color LaserJet 4500 printer uses 100-pin, non-parity, synchronous DRAM memory modules. The HP Color LaserJet 4550 printer uses 168-pin synchronous DRAM memory modules. The SDRAM modules do not need to be configured in pairs (in corresponding left and right slots). Extended Data Output (EDO) DIMMs are not supported. Adding memory HP Color LaserJet 4500 printer You can install 4, 8, 16, 32, or 64 MB DIMMs into the printer's three DIMM slots. The DIMM slots can be used to add memory, fonts, or firmware upgrades. HP Color LaserJet 4550 printer You can install 64 or 128 MB DIMMs into the printer's two DIMM slots. The DIMM slots may be used to add memory only. You can add fonts or firmware upgrades to the printer's two 100-pin slots. The HP Color LaserJet 4500 printer will recognize RAM only up to 208 MB. The HP Color LaserJet 4550 printer will recognize RAM only up to 192 MB. Additional memory will not be used by either printer. To install memory in the printer, you must remove the formatter board from the rear of the printer. To remove the formatter board, remove the six screws shown in Figure 4-4. The DIMMs are then inserted into the available slots in the formatter board. See Appendix A in the online user guide for installation instructions. Figure 4-4 Removing the formatter board CAUTION Do not attempt to remove the DIMM in slot #4 (see Figure 4-5) of the HP Color LaserJet 4500 printer, or the DIMM in slot #3 (see Figure 4-6) of the HP Color LaserJet 4550 printer. This DIMM is part of the printer's firmware. Removing it will affect printer operation. 98 Printer maintenance C7085-90921