3-10 888-2595-001 12/20/11
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
ZX Series
STEP 5 RF MUTE ACTIVE alarm clears and power ramps up from zero to new
power level.
STEP 6 Consult Section 5 – Maintenance for power adjustment procedure if
power level in new mode is not correct.
STEP 7 Procedure complete.
The power RAISE/LOWER power control setting is preserved while switching
transmitting modes. For example, if the transmitter were operating at 65% of the
maximum FM setting in FM mode, it would transmit at 65% of the maximum HD
setting after switching to HD mode.
3.4.4 Basic Functional Check Procedure
This procedure provides the operator with a basic procedure for assessing the
operational status of the ZX series transmitters. It assumes that the transmitter is
currently switched on.
STEP 1 Check front panel STATUS LED to verify that correct mode is selected
(FM, FM+HD, or HD) and light is green.
GREEN = Amplifier on and no alarms registered
YELLOW = Amplifier on but alarms reported
RED = Amplifier is off
STEP 2 Check forward power reading on front panel multimeter(s) and verify
transmitter is currently at desired power level.
STEP 3 Actuate front panel meter select button to review reverse power, PA
stage voltage, and PA stage current readings.
STEP 4 Compare meter readings to recorded baseline readings.
To facilitate the evaluation of transmitter meter readings, it may be desirable to
attach a small label on or near the transmitter (or inside front door) with the nor
-
mal, expected readings for forward power, reverse power, PA volts, and PA amps.
STEP 5 If front panel STATUS LED is not green, open amplifier chassis front
door and perform following checks:
a. Check alarm LEDs on controller board.
b. Check status of DC OK lights on PS modules.
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