
1
Figure33-EPROMandRAMChipUpgrades
6
2
BELOWARETHELOCATIONSYOUWILLNEEDTOKNOWFOREPROMAND/ORRAMCHIPUPGRADES.
FORDETAILEDINFORMATIONONTHEIRREPLACEMENTREFERTOTHECHAPTERENTITLED"INSTALLINGEPROMANDRAMCHIPS".
1
3
EXTERNALBATTERY
EPROM(U4)
ACPOWER
4 RAM1 7 U12RS485
6
EXTERNALLITHIUMBACKUPBATTERY(H4)
5 RAM22
H4
BATTERY
CONNECTION
H1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
A
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
B
U4 U5 U6
3 4 5
THISDIAGRAMSHOWSTHESMALLER(PHYSICALSIZE)RAMCHIPSBEINGUSED.
ALARGER(WIDER)RAMCHIPCANALSOBEINSERTEDINTHEU5ORU6SOCKETS.
THEKEYPADMUSTBEREMOVEDTOACCESSTHECHIPS
LARGERCHIPS
USETHESEPINS
LARGERCHIPS
USETHESEPINS
U12
7
DOOR1 DOOR2
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