Zone Controller Eprom Replacement; Figure 16: Ez Zone Zone Controller Eprom Location - York EZ Zone Upgrade Manual

EZ Zone/Meridian

Zone Controller EPROM Replacement

EPROM Location
See Figure 17 For
Removal And
Installation Instructions
FLOW
CX8
RN1
D5
CX9
U9
R22
D5
P.U.
R32
R23
T'STA
T
R24
R25
D7
CX10
LD3
R26
250
D4
F1
24VAC
GND

Figure 16: EZ Zone Zone Controller EPROM Location

28
Notch
RAM
8K
32K
CX4
CX3
CX1
U4 U3
16L8
R1
R2
RAM
EPROM
R3
80C55
CX2
2
R4
R5
ADDRE
R6
SS ADD
R7
1
2
4
8
16
32
TOKEN
NET
SCAN REC
24VDC
CONTACT:
UL / CSA 5A250VAC
D3
C7
24VDC
CONTACT:
UL / CSA 5A250VAC
V2
036-21423-001 Rev. A (0602)
The EZ Zone Zone Controller
EPROM chip must be replaced
with the Meridian Zone
Contoller upgrade EPROM chip
part # 2ZZC004708224. This
EPROM chip is factory pro-
grammed with the new Merid-
ian to EZ Zone software. This
chip must be replaced or the
zone controller will not function
with the Meridian system.
CAUTION:
Power must be removed from the
Zone Controller board during re-
moval of the old EPROM chip
and installation of the new
EPROM chip. It is also impera-
tive that the old EPROM chip is
removed gently to avoid damage
to the circuit board. Installation
of the new EPROM chip must
also be done with care to prevent
damage to the pins on the new
chip. See the next page for de-
tailed chip removal and instal-
lation information.
Upgrade