User Manual

G3S-800-140-031 Installation & Service Manual
 Copyright Powerwave Technologies, Inc., September 2001. All rights reserved
044-05095 Rev. A 6-1 September 2001
Section 6 Troubleshooting
6-1 Introduction
This section contains a list of problems and a few suggested actions that may correct the prob-
lem. If the suggested corrective action does not eliminate the problem, please contact your Pow-
erwave field representative or the factory for further instructions.
NOTE
Check your sales order and equipment warranty before attempting to service or repair
the unit. Do not break the seals on equipment under warranty or the warranty will be
null and void. Do not return equipment for warranty or repair service until proper
shipping instructions are received from the factory.
6-2 Troubleshooting
The following are general guidelines established to aid Field Engineers or Cell Site Technicians
in the proper method of Powerwave equipment fault resolution by fault mode.
6-2.1 DC Voltage Indicators Not Illuminated
1. Check the front panel ON/OFF switch.
2. Check the power plant circuit breaker.
3. Check for +27 +
1.0 VDC at the amplifier subrack input.
A. If the voltage is low, verify that all DC connections between the power plant and the
amplifier subrack are tight.
B. If the voltage is correct,
1. Remove the amplifier from the subrack slot and move the amplifier to another am-
plifier subrack slot.
2. Check the voltage on the power pins of the mating amplifier and amplifier subrack
connector.
3. Verify that the amplifier DC connections are not damaged.
4. Return the amplifier to the factory for repair.
6-2.2 OVER PWR Illuminated or Blinking
1. If all the amplifiers in a given amplifier subrack are in Over Pwr and the LPA Disable LED is
illuminate, then the input RF power level is too high and the amplifiers have been turned off.
RF power may be incorrectly set during equipment commissioning. This may be due to a
faulty jumper cable. Verify the amplifier subrack output cables, transmit filter, and directional
coupler are in proper working order. The loss between the amplifier subrack and the hatch
plate is typically less than 2.0 dB.
2. If all the amplifiers in a given amplifier subrack are in Over Pwr and the LPA Disable LED is
not illuminated, then the input RF power level is too high. The amplifier subrack is attempting
to maintain a safe power output level (smart subracks with True RMS power detectors and
voltage variable attenuators only). RF power may be incorrectly set during equipment com-
missioning. This may be due to a faulty jumper cable. Verify the amplifier subrack output ca-
bles, transmit filter, and directional coupler are in proper working order. The loss between
the amplifier subrack and the hatch plate is typically less than 2.0 dB.