PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual
Page 46
IX — PROBLEM SOLVING/TROUBLE SHOOTING
to the fan. There is also a fuse located just inside of the front panel in case there is a locked rotor failure
condition. To access the fuse, the MFA1KW must be removed for the rack and the top cover removed.
The fuse is located just behind the front panel.
ADP500: There are a number of fault indicator lights on this unit that can be used for trouble shooting
possible problems with the transmitter.
With normal operating conditions, all the LEDs located on the front panel should be green. Red lights
could indicate a fault in normal operations of the transmitter. Fault indicators are listed below:
a. ANT VSWR HIGH light is RED. This indicated that the antenna reflected power exceeds the set point
in the equipment which is normally set to 10 %. When this LED is on, the transmitter shutdown line
is pull down to ZERO and the transmitter RF PWR OFF LED will also light RED indicated that the
transmitter has been shutdown at the driver level. This condition will automatically reset when the
problem is corrected. CHECK THE ANTENNA FOR POSSIBLE FAULTS.
b. RF PWR OFF light is RED. This will occur anytime the “SHUTDOWN LINE” is pulled to ZERO.
This control line is pulled to ZERO with any of the following faults:
c. ANT VSWR HIGH
PA INHIBIT SWITCH IN THE INHIBIT MODE
NOTICE: ONLY THE PA INHIBIT SWITCH OR THE ANT VSWR HIGH WILL SHUTDOWN THE
TRANSMITTER DRIVE CAUSING THE RF OUTPUT TO FALL TO NEAR ZERO.
d. PA1 THRU PA5 LEDs RED would indicate that the PA Pallet current level has fallen below the set
point and could indicate a transistor failure.
RR6000 (AC2008) POWER SUPPLY MODULES
The Power Supply module has two warning lights located on the front panel. Normally these lights are
GREEN indicating that the AC Line voltage and the Over Voltage circuits are within their normal range.
Should either go out of range, the lights will turn RED and the power supply module will shutdown. This
will reduce the available power to the RF Stages and could result in lower RF Output Power from the
transmitter. If this happens, turn off the transmitter for about 1 minute and then turn it back on. If this
warning continues, the module should be removed from the rack and returned for service and a spare
module should be installed to maintain normal operations.
NOTICE: The VTX2KWA transmitter has 4 each 2 KW power modules. Under normal conditions, this is
enough head room to allow the removal of one power supply module with little or no reduction in output
power. In the event it becomes necessary to remove a module and the RF Output power drops, the RF
Drive level from the Modulator can be reduced to a point where the DC Volt meter on the ACDIS2 reads
31 volts. This is the maximum output level obtainable with one power supply module removed. On this
transmitter that could be a reduction of less than 500 watts in operational output power. This will keep the
station on the air till the new power supply module arrives. DON’T FORGET TO TURN THE DRIVE
LEVEL UP AFTER INSTALLING THE NEW SUPPLY TO RETURN TO 100% OPERATION.