WattMaster Auto-Zone Plus, Design, Installation And Operation

Page: 139 / 180

Auto-Zone Plus Section 4
Start-Up and Troubleshooting 4-21
1.3.11 Comm Driver Chip Replacement
Figure 4-6:
Communication Driver Chip Locations
Pin 1
Dot
Socket
Printed
Circuit
Board
Typical RS-485
Communications
Driver Chip Detail
System Manager
Comm Driver Chip
( U1 )
Pin 1
Commlink II
Comm Driver Chip
(U12)
CV Controller,CV-C Controller
GPC Contoller, Wetbulb Controller
COMM
T
SHLD
LD4
REC.
RAM 485
COMM
R
Pin 1
Comm Driver Chip
( U5 )
1.) Be Sure That Any Small Screwdriver Or Other
Sharp Object Used To Remove The Chip Does Not
Come Into Contact With The Printed Circuit Board
Surface.
2.) A Small Screwdriver May Be Inserted Between The
Chip And The Socket To Aid In Removal Of The Chip.
3.) Be Very Careful Not To Insert The Screwdriver Under
The Socket!! Damage To The Board Is Not Covered
By Warranty.
Warning!
Use Extreme Caution When Removing Any Chips
To Avoid Damaging Any Circuit Board Traces Which
Are Under The Chip.
Notes:
24V
AC
GND
SHLD
EPROM
SYSTEM MANAGER
YS101806 REV. 1
U13
CX13
R10
CX12
U12
L1
RN1
U2
C3
U6
CX7
CX9
U7
SYS48K2V
U9
U8
CX8
RN2
X2
C2
C1
X1
CX4
U4
R2
R1
EWDOG
R3
SC1
T
TB1
R
TB2
D3
U5
CX5
U1
CX1
Comm Driver Chip
( U10 )
Pin 1
1
2
3
4
5
6
7
8
OFF
1
2
4
8
16
ADDRESS
T'STAT
COMM
POWER
Zone Controller
Zone Manager
Network Loop
Comm Driver Chip
( U5 )
Local Loop
Comm Driver Chip
( U8 )
Zone Manager
Comm Driver Chip
( U15 )
Pin 1
Pin 1
Pin 1
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