Technical Manual

PINEAPPLE TECHNOLOGY, INC.

UTX3KW-A Operating and Service Manual

Page 55

VII — ROUTINE MAINTENANCE

The following KEY MAINTENANCE AND PERFORMANCE CHECKS should be made monthly or more

frequently in some environments where dust is a problem:

TRANSMITTER

• Remove and clean the air lters with a light detergent and DRY COMPLETELY before re-installing. Dirty

lters will cause PA amps to shutdown resulting in a loss of RF Power. Spare lter P/N 990199 is

available from Pineapple Technology, Inc.

• Check and record the voltage and current meter readings on the ACDIS3 (AC AND DC DISTRIBUTION

UNIT LOCATED NEAR THE POWER SUPPLIES). NOTE: current readings will vary with picture content,

Therefore a standard video waveform such as SMPTE BARS should be used.

• Using the ADP500 & PAS10 — record the bias level settings on each PA Pallet by selecting the appropriate

PA with the selector switch. To make this measurement of BIAS ONLY it is necessary to activate the PA

INHIBIT switch momentarily for each reading.

• Using the ADP500 — check and record the RF Output power level to ensure that it is still reading 100%

+/- 10% from the previous settings.

• Using the ADP500 — check and record the VSWR (Reected power) to ensure that it is still reading only a

few percent indicating normal load operations.

• Using the ADP500 — check and record Aural power readings. This is normally set at 10% of P-sync. Expect

this to vary only a few percent from reading to reading.

• Carefully inspect RF Output coax and coaxial ttings for excessive heating or discoloration.

• Check DC power connections on shunt panel and power supplies for over heating and tighten as needed.

• Check DC connections on PA rear panel.

FACILITIES

• Clean all air inlet lters and exhaust outlets to ensure that the transmitter is getting clean unobstructed

air ow.

• Perform recommended service on air condition systems.

• Rodent traps or baits should be renewed to keep the facilities clear of these pests which can cause damage

to the transmitter.