12/20/11 888-2595-001 3-9
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
ZX Series
STEP 7 Perform Basic Functional Check procedure (see 3.4.4) as desired to
assess transmitter status.
STEP 8 Procedure complete.
3.4.2 Power Raise/Lower Procedure
The electronic RAISE/LOWER power control is typically left at or near its maximum
setting to achieve the full power level determined by the POWER LIMIT
potentiometer(s) on the controller board. It may be desirable at some point to
temporarily lower power while tower maintenance is being performed or as a
troubleshooting tool.
STEP 1 Select forward power metering position on front panel meter via meter
select pushbutton.
STEP 2 Open amplifier front door and locate POWER RAISE and LOWER
pushbuttons on controller board (reverse side of front door)
STEP 3 Adjust output power using POWER RAISE or LOWER pushbuttons.
With transmitter gain control circuits properly adjusted, it should be
possible to vary power from <10% to 100%. Front panel status LED
should remain green at all times.
STEP 4 Procedure complete.
Consult Section 5 – Maintenance for procedures for permanently adjusting the
power level via the POWER LIMIT potentiometer(s).
3.4.3 Switch Operating Mode Procedure (FlexStar HDX
Exciter)
STEP 1 Access mode selection fields on user screen of FlexStar HDX exciter.
[Home>Setup>Output>Next]
STEP 2 Command exciter to switch to desired mode (FM, FM+HD, HD) by
setting Primary Mode: Main parameter.
STEP 3 ZX transmitter (amplifier chassis) registers RF MUTE ACTIVE alarm
and transmitter power drops to zero.
STEP 4 Transmitting status LED changes on amplifier front panel to reflect new
mode selection.
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