Replacement; Eprom And Time-Of-Day Clock Chips; Removal - HP 1000 A990 Installation And Service Manual

Replacement
Replace a plug-in card by reversing the removal procedure. Make sure you have set the switches
on the card correctly. All plug-in cards must be installed with the component side facing towards
the right. For the A990 CPU card, the side with the bank of eight LEDs must face towards the
right.
EPROM and Time-of-Day Clock Chips
Caution
I
Removal
STATIC SENSITIVE DEVICE. Use anti-static handling procedures when
removing or installing a chip on the A990 CPU card.
To remove the EPROM or time-of-day clock chip, set the power switch to OFF and remove the
CPU card from the computer, placing it on a flat surface. While observing the anti-static
handling precautions, carefully pull the chip from its mounting socket. Refer to Figure 3-2 for the
chip locations.
Replacement
Replace the EPROM or time-of-day clock chip by reversing the removal procedure. When
reinstalling the chip, be sure to note the orientation of pin 1 as illustrated in Figure 3-2.
Service 3-13