User Manual

G3S-800-140-031 Installation & Service Manual

044-05095 Rev. A 6-2 September 2001

3. If only one or two amplifiers in a given amplifier subrack are in Over Pwr and the LPA Dis-

able LED is blinking, then the amplifier subrack is probably in Sleep Mode (smart subracks

with True RMS power detectors and voltage variable attenuators only).

A. Pressing the On/Off/Reset switch momentarily in the Up position or cycling DC power

on the amplifier should bring the amplifier back on-line.

B. Sleep Mode firmware may be disabled in the field with a PC interface and software

available from Powerwave.

4. Move the amplifier to another slot in a different subrack, if available. Mark the amplifier with

a sticker or place a tie wrap on the handle to identify the amplifier. Monitor for future failure.

A. If the same amplifier fails again, return the amplifier to the factory for repair.

B. If the replacement amplifier in the original subrack fails, replace the amplifier subrack.

6-2.3 HIGH TEMP Illuminated

5. If an amplifier is in HIGH TEMP and the LPA Disable LED is illuminate, then the amplifier

heat sink temperature is too high. This may be due to:

A. High ambient temperature.

B. Fan failure.

C. Insufficient air-volume capacity. Most of Powerwave’s amplifiers require a certain

amount of free-space to allow proper airflow.

6. Correct the heat problem, then reset the amplifier by momentarily pressing the Reset button

on the amplifier front panel up.

6-2.4 VSWR Illuminated

7. If all the amplifiers in a given amplifier subrack are in VSWR and the LPA Disable LED is il-

luminate, then the output RF reflected power level is too high and the amplifiers have been

turned off. This may be due to a faulty jumper cable or transmit filter. 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. This

fault normally occurs during site or just following site power setting and normally takes about

10 to 15 minutes to reveal itself. This fault may not occur at low power levels (i.e. when just

one or two channels are up).

8. If one amplifier in an amplifier subrack is in VSWR and the LPA Disable LED is illuminated,

then the output RF reflected power level is too high for that amplifier. This may be due to

A. A damaged or recessed amplifier RF output connector. Return the amplifier to the fac-

tory for repair.

Mishandling of the amplifier normally causes recessed pins. Before installing an ampli-

fier, look at the D-sub connector to ensure none of the pins are recessed, bent or that

the outer connector shield is not damaged. When installing the amplifier, do not force

the amplifier into the slot. Gentle even pressure is all that is needed to properly seat the

amplifier.

B. Improper seating of the amplifier.

1. Ensure the amplifier thumbscrews are properly tightened.

2. Try seating the amplifier in another subrack slot.

3. Try seating the amplifier in a subrack in another sector.

6-2.5 DC FAIL Illuminated