User's Manual

PINEAPPLE TECHNOLOGY, INC.
UTX2.5K ULTRA Operating and Service Manual
IX -- PROBLEM SOLVING/TROUBLE SHOOTING
IX - PROBLEM SOLVING & TROUBLE SHOOTING (Page 2of 3)
SHUTDOWN RED indicates that the PA has been "SHUTDOWN". There are two
possible reasons for this:
1. Heat Sink over temperature thermostat has tripped protecting the PA
CHECK: Air inlet filter for possible restrictions to air flo
w
CHECK: Fan air flow for possible fan faul
t
CHECK: Room temperature
Note: Heat sink over temperature fault is indicated by the RED alert light goin
g
ON/OFF in cycles varying in duration depending on air flow. The P
A
returns to normal operation automatically when the problem is corrected.
2. Remote Shutdown by external signals coming from other protection circuits.
CHECK: Transmitter global protection circuits.
ADP500 MONITOR
The ADP500 is a general purpose test instrument used to display PA status and measure voltage,
current and RF power levels. When combined with the PAS3 it is possible to measure the current
being drawn by each PA RF Device. In addition to its measurement features, it serves to integrat
e
fault signals for PA Assemblies, High VSWR alarms and provides an interface to the RM8 Remote
Control Unit. The ADP500 is a diagnostic tool for troubleshooting the transmitter.
With normal operating conditions, all the LED's on the front panel are GREEN. Red LED's could
indicate a fault in the transmitter that require attention.
RF PWR OFF LED is RED Will occur anytime the "SHUTDOWN LINE" (SD) is set to zero (0)
volts. The following conditions will pull the set SD to zero volts
:
1. Antenna VSWR HIGH
2. PA INHIBIT SWITCH actuated.
A
NT VSWR HIGH LED is RED This indicates that the antenna reflected power exceeded the se
t
trip point. This is an internal setting performed at the factory and is
normally set to 10% of the RF OUTPUT POWER set point.
CHECK: The transmitter output connections and antenna for
possible faults. The fault condition will automatically reset whe
n
the problem is corrected.
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