User's Manual

Table Of Contents
10/19/07 888-2687-001 4-7
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Ranger ™ Mobile Series
b. /RESTRIKE (reset)
This command is monitored by all of the control boards but is driven
only by the Main Controller board. When the transmitter is already
turned ON and the operator presses the “ON” button again, this line
will be pulsed low for a minimum of 100ms. This will cause all of
the controller boards to reset any faults and status and try to return to
normal operation. This line is a sense only line for the rest of the con-
trol boards.
This command is basically a RESET pulse which will try to turn on
any transmitter components which have faulted off due to a critical
fault condition. If they are still faulty, this will be detected and the
component will simply be shut off again. This will not reset or clear
the Fault Log.
c. /FLT_OFF
This command is initiated whenever a fault occurs that requires all
RF to be shut off and the PA supplies to be disabled. This is a latch-
ing type signal that requires user input to clear the fault and turn the
transmitter back on. This signal is active low. The Main Controller,
PS Monitor, External I/O and RF Monitor Boards monitor this line
and have the ability to activate it if necessary.
d. /RF_MUTE
The /RF_MUTE line shuts down all RF output temporarily until the
fault condition is cleared. This is a non-latching signal. The Main
Controller, PS Monitor, External I/O and RF Monitor Boards moni-
tor this line and have the ability to activate it if necessary.
e. /PS_MUTE
The /PS_MUTE line shuts down the output of the 32 Volt PA module
supplies temporarily until the fault condition is cleared. This is a
non-latching signal. The Main Controller, PS Monitor, External I/O
and RF Monitor Boards monitor this line and have the ability to acti-
vate it if necessary.
f. /AC_LOW
This signal is an early warning of impending loss of control voltage.
When the AC line voltage that powers the LVPS(s) drops below an
acceptable threshold the board will pull this open collector line low.
The AC sample from L1 to L2 (A-B) will be monitored. The other
boards in the control system will use this indication as an advanced
warning to save any data and prepare for loss of power.
The PS Monitor board is the only control board with the ability to
drive this signal and it will affect the Main Controller, External I/O
and RF Monitor Boards.