User's Manual

PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual
Page 42
VII — ROUTINE MAINTENANCE
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 filters with a light detergent and dry completely before re-installing. Dirty
filters will cause PA amps to shutdown resulting in a loss of RF Power. Spare filter P/N 990199 is
available from Pineapple Technology Inc.
• Check and record the Voltage and Current meter readings on the ACDIS2 (AC AND DC DISTRIBU-
TION UNIT LOCATED NEAR THE POWER SUPPLIES). NOTE: current readings will vary with
picture content.
• Using the ADP500 & PAS10 record the bias level settings on each PA Pallet by selecting the appropri-
ate 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 insure that it is still reading 100%
+/- 10% from the previous settings.
• Using the ADP500 check and record the VSWR (Reflected power) to insure 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 fittings for excessive heating or discoloration
FACILITIES
• Clean all air inlet filters and exhaust outlets to insure that the transmitter is getting clean unobstructed
air flow.
• Perform recommended service on air condition systems
• Rodent traps or baits should be renewed to keep the facilities clear of these pests which can damage to
the transmitter