Avery Berkel CX20 SERIES, Руководство по обслуживанию

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22 — Communications Controller
22–5 CX20/CX30/CX34 Service Manual
22.2.1 Dual comms controller operation
IMPORTANT:
Dual controller operation is only available on networks with
Phase 1.3 software release and above.
Networks with dual comms controller operation have two comms controller
PCBs. One PCB operates as in a normal, single comms controller network.
The other operates as a back up by taking over from it if it fails.
The dual comms controller PCBs are modified versions of the single comms
controller PCBs and can be identified by the following:
diode between the collector of TR1 and D4
link between IC24 pin 5 and D16
CHANGE REFERENCE label with 0 & 1 highlighted – this shows that
modification has been done
The part numbers of the PCBs available for dual controller operation are:
71014–395 Mod.5 and above.
71014–512 Mod.4 and above.
NOTE 1: The following PCBs, when suitably modified, can be used for dual
controller operation prior to the above PCBs becoming available:
71014–395 Mods.2, 3 and 4
71014–512 Mods.2 and 3.
NOTE 2: Comms controller PCBs with Mod.1 copperwork can not be modified
for dual controller operation.