Service and troubleshooting
8.74 EST3 Installation and Service Manual
3-AADC1 Addressable Analog Driver Controller
Substituting 3-AADC1 local rail modules
When substituting a known good 3-AADC1 rail module in place
of a suspect rail module, you must download the system
configuration and Addressable Analog circuit data circuit
information into the CPU module. This operation requires a PC
and the SDU Program.
The 3-AADC1 actually has two separate memories. The first
memory contains the firmware that makes the module operate. If
there is a problem with the firmware, or if an upgrade has been
issued, the new firmware is downloaded into the module using
the 3-AADC1 Code tab, which is found in the Version Control
(Code) function of the Tools, Download menu. When upgrading
the module firmware (code), you do NOT need to download the
“Bootstrap” data unless specifically instructed to do so.
The SDC configuration information is stored in the module’s
second memory. If you suspect that the module itself is bad, you
must download the configuration information for the circuit that
will be connected to the substitute module, using the 3-AADC1
Database tab, which is found in the Version Control (Database)
function of the Tools, Download menu.
Connect the PC to the CPU RS-232 connector J5.
Table 8-41: 3-AADC1 Local Rail Module troubleshooting
Problem Possible cause
Analog Circuit Open 1. Circuit incorrectly wired or connector loose
2. Defective detector or isolator base
3. Broken conductor
4. Device not installed on circuit
5. Device not entered into SDU databases
Analog Circuit Shorted 1. Circuit incorrectly wired
2. Defective detector, detector base, or module
3. Nicked insulation between conductors
Analog Circuit Ground Fault 1. Pinched wire between device and electrical box
2. Nicked wire insulation
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