User Manual

PINEAPPLE TECHNOLOGY, INC. IX--PROBLEM SOLVING AND TROUBLESHOOTING
DTXPRO-1.2KU OPERATING AND SERVICE MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
IX - 4
IX - PROBLEM SOLVING AND TROUBLE SHOOTING (Continued)
PA1 - PA5 LED's are RED This will indicate that the PA Pallet currents are below the 500 ma set
point. This can occur when the PA Power device has failed.
CHECK 1: Select the PA device in question for current display on the
multi-meter. Compare the reading to the station log. If abnormal, it is
possible that a power transistor has failed.
NOTICE: PA5 will go RED when the INHIBIT SWITCH is actuated.
CHECK2: To confirm a failed device, it is necessary to shutdown the
transmitter and remove the PA1K power amplifier assembly and
check the device in question. Use a VOM to check the resistance
from the gate of each 1/2 of the device to ground. If either reading is
below 1K ohm it is likely that the device has failed.
POWER SUPPLY MODULE LED RED
The Power Supply Module has two warning LED's located on the front panel. Normally these
LED's are GREEN indicating that the AC Line voltage and the OVER VOLTAGE circuits are
operating properly. If either LED turns RED the module is question will be turned off and is no
longer supplying power to the transmitter. These modules are "HOT PLUGGABLE" and can be
removed from active service by simply removing it from the main frame. Pineapple Technology,
Inc., does not recommend any attempt to service these modules. Any attempt to service may
void factory warranties. Return the module to Pineapple Technology, Inc., or to the manufacture
for service.
NOTICE: If it becomes necessary to operate the transmitter with a missing supply module,
very little if any performance degrading will be experienced. Check the AUX volt meter for
any indication of a drop in voltage (normally 50 VDC). This drop is caused by the power
supply modules going into "CURRENT LIMIT". It is important that the voltage be around 50
volts ±0.5. If the voltage falls below this point, it can be recovered by reducing the RF
Drive level a small amount in most cases.