Repair
8500C/8500C+ System Maintenance Manual 5-49
c. Remove both EPROM’s as follows: using a small, straight-blade screwdriver, carefully
pry up one end of EPROM just a little bit. Pry up other end a little. Go back and forth until
EPROM is loose.
Trying to pry out the EPROM in one step will bend the EPROM pins.
d. Remove new EPROM’s from container. They should have a higher dash number or letter
than ones removed.
Precautions against electrostatic discharge are critical at this stage.
e. Install new EPROM’s as follows: orient EPROM with notched end in direction shown in
Figure 5-15. Align left end of EPROM with left end of SRAM memory IC (U10) and
make sure pins are all straight and part-way into each socket hole when EPROM is set on
socket - look along the board, beneath the EPROM for pins bent under. Once pins all align
properly, push EPROM slowly but firmly into socket, keeping it straight.
NOTE: If pins do not align well, very carefully push EPROM against a flat surface to form
pins inward until they are parallel.
f. Install bezel (Figure 5-17 (4)) on keypad panel (1) and secure with ten screws (32) and
four screws (33).
5.7.4 Battery Pack Check and Replacement
5.7.4.1 Battery Pack Check
a. Power the 8500C/C+ unit continuously for 72 hours. This ensures the battery pack has
become fully charged.
b. To access battery pack, remove ten screws (Figure 5-17, (32)) and four screws (33) and
remove bezel (4).
c. Fold back printer/disk drive assembly so that it stands straight up on its side with keypad
panel (1) lying flat on table, as shown in Figure 5-16.
d. Check battery voltage for 3.6 V. Replace battery pack, if necessary, in accordance with the
next section.
e. Install bezel (Figure 5-17 (4)) on keyboard panel (1) and secure with ten screws (32) and
four screws (33).
5.7.4.2 Battery Pack Replacement (Figure 5-17)
The battery pack is located on analog board A2. Replace battery pack as follows:
a. To access analog board A2, remove digital board A1 in accordance with instructions in
Section 5.8.1.1.1.
CAUTION
CAUTION
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