BIRD TERMALINE 8251 Series, Operation Manual

8

Chapter 5

Maintenance

This chapter covers cleaning, inspection, troubleshooting, and specifications for the Bird 8251 series loads.

Troubleshooting

The table below contains troubleshooting information for problems which can occur during normal operation. This 
manual cannot list all malfunctions that may occur, or their corrective actions. If a problem is not listed or is not 
corrected by the listed actions, notify a qualified service center.

Maintenance

Cleaning

The outside surface of the instrument should be wiped free of dust and dirt when necessary. Excessive dust on the 
cooling fins will interfere with heat dissipation. Clean the RF connector, both metallic and insulating surfaces, with a 
dry, non-residue forming solvent.

Problem

Possible Cause

Correction

Leaking coolant

Loose clamping band

Tighten the clamping band

Defective or improperly installed front 
O-ring

Replace the O-ring 
(

See “Load Resistor” on page

  11.

)

Defective or improperly installed rear 
O-ring

Replace the O-ring 
(

See “Rear Seal” on page

  10.

)

High or low DC resistance

Loose RF input connector

Tighten connector

Faulty RF input connector

Models with “QC” type connectors: Replace connector 
(

See “RF Connector” on page

  10.

)

All other models: Return the unit for service

Faulty resistor

Replace the resistor 
(

See “Load Resistor” on page

  11.

)

Overheating radiator

RF power too high

Lower RF power (

See “Specifications” on page

  13.

for maximum RF power)

Coolant level too low

Check the coolant level. Add coolant if necessary (

See 

“Coolant” on page

  9.

)

Coolant degraded

Replace the coolant 
(

See “Coolant” on page

  9.

)

Faulty resistor

Replace the resistor 
(

See “Load Resistor” on page

  11.

)

WARNING

Never attempt to connect or disconnect RF equipment from the transmission line while RF 

power is being applied. Leaking RF energy is a potential health hazard.

WARNING

Disconnect the unit from all power sources before servicing. The unit may be energized 

from multiple sources. The potential for electric shock exists.