4-22 888-2595-001 12/20/11
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ZX Series
open collector of a FET on the option web remote board (Q1 on page 2 of 8010203391),
or a remote ground closure coming in from outside if the REMOTE ENABLED mode
has been selected (ON_CMD line passing U5 on page 4 of 8010203541).
When multiple PA chassis are connected together via the system bus, all
ON_CMD_BUS lines are bridged. Accordingly all PA chassis will receive an on
command when the ON_CMD_BUS line is grounded anywhere. This ground
connection could come from any of these sources:
• The ON button on any chassis.
• An ON command issued by the optional web remote card on any chassis
• A grounding of the TX ON CMD command on the remote terminal board.
The same functionality exists for the off, power raise and power raise commands.
Figure 4-1 Simplified schematic of command sharing (general case of up to four PA chassis)
When the optional exciter main/alt switcher is installed, a similar functionality exists
for the exciter A select and exciter B select commands. Pins 11 and 12 of the exciter
bus are repurposed by a special break-out cable to carry the command lines
REM_A_SELECT and REM_B_SELECT to the J10 USER REMOTE connection at
the rear of the exciter main/alt switcher. When these lines are grounded at any point
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