HP 24SII - Manual (Page 134)


C.3 MODEL 24SII MAIN BOARD EPROM
UPGRADE
The materials you will receive with your upgrade kit are:
One EPROM (chip with label)
The materials you will need to supply are:
Phillips-head screwdriver
IC DIP extractor or a pair of curved needle-nose pliers
1. IMPORTANT: Remove power from the unit by depressing the
power switch on the front of the unit to OFF. Also remove power
cord from the AC outlet.
2. Remove the cover of the unit by unscrewing the 4 screws located
on the top panel with the phillips-head screwdriver.
3. With the front of the unit (LED side) facing away from you, locate
socket U2 (see Appendix D.3 - Main Board Mechanical Layout).
4. Remove existing EPROM from socket U2 with IC extractor or
needle-nose pliers. Gradually loosen each side of the chip,
alternating pliers from side to side, so as not to bend chip pins. Pull
loosened EPROM all the way out.
5. Install new EPROM into socket U2. The EPROM is notched; the
notch on the EPROM will point towards the right of the unit. When
installing the new chips, be careful not to bend any of the pins.
Also make sure all pins fit their sockets.
6. Replace the cover; the upgrade is now complete.