Harris ZX10, Technical Manual

Page: 76 / 198

3-8 888-2595-001 12/20/11
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WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
ZX Series
3.4 Basic Operational Procedures
Below are a collection of basic procedures typically performed by the transmitter
operator.
NOTE:
The ON, OFF, POWER RAISE, and POWER LOWER pushbuttons are ganged
together in the ZX7.5 and ZX10 models whenever all PA chassis are in REMOTE
ENABLED mode. Pressing the ON button on any one amplifier chassis will
simultaneously turn on all amplifier chassis. It is sufficient to press the ON but-
ton on only one chassis (the most conveniently accessible one) when instructed to
do so in the procedures below. The same is true for the OFF, POWER RAISE,
and POWER LOWER pushbuttons.
3.4.1 ON/OFF Procedure
STEP 1
Power supply internal fans operate whenever AC is applied.
STEP 2
Press front panel ON button.
STEP 3
PA power supplies output 50V DC and fans at rear of chassis start.
STEP 4
Status LED on front panel changes from red to yellow to green.
STEP 5
RF power is ramped up from zero to full power.
STEP 6
Consult front panel meter to verify correct power output level.
Table 3-4 ZX system metering assembly
Item Description
[001] Calibration potentiometers
Provides fine calibration of the forward and reverse power readings.
FM = FM mode forward power calibration.
FM+HD = FM+HD mode forward power calibration
HD = HD or SL mode forward power calibration
REV = reverse power calibration, all modes
[002] Forward power meter
Displays the final system output forward power in kilowatts.
[003] Reverse power meter
Displays the final system output reverse power in Watts.